Published August 24, 2026. All dates, model numbers, and specifications in this article come from Mitsubishi Electric technical bulletin FA-A-0466-B (issue September 2025, Ver. B July 2026).   Five weeks to the make-to-order cutoff   September 30, 2026 is about five weeks from today. On that date, the Mitsubishi MELSEC-L series of compact PLCs moves to make-to-order status, the first formal step in a phase-out that ends with production discontinuation on October 29, 2027. The deadline comes from Mitsubishi Electric technical bulletin FA-A-0466-B, first issued in September 2025 and revised in July 2026. For maintenance teams, panel builders, OEMs, and distributors, the practical meaning is straightforward: normal off-the-shelf availability of MELSEC-L hardware ends this month. After September 30, 2026, units are built only against confirmed orders, lead times grow, and prices firm up. After October 29, 2027, no new units are produced at all, and the only sources of hardware are existing stock, surplus channels, and the used market. The same date carries a second weight for the Mitsubishi installed base. September 30, 2026 is both the final order cutoff for the MELSEC-Q series, announced in bulletin FA-A-0418-A, and the make-to-order transition for MELSEC-L. Two major PLC families reach their deadlines on the same day, which means the spares market for both families tightens at the same moment. MELSEC-L was positioned between the FX and Q families. It was widely used in small-to-mid machine control, packaging, and building systems across Asia, the Middle East, and Europe. That footprint matters here. The phase-out hits more than new designs. Every running machine, installed panel, and maintenance stockroom that still carries L-series cards is in scope. The bulletin applies to the entire product family: CPUs, power supplies, I/O, analog, positioning, network modules, and accessories all move on the same schedule.   The three dates that matter   Bulletin FA-A-0466-B sets out a three-step timeline. Here it is in plain form: Date | Event | What it means in practice September 30, 2026 | Transition to make-to-order | Standard stocking production ends. Orders are accepted, but units are built to order. Lead times lengthen. September 30, 2027 | End of order acceptance | Last date Mitsubishi Electric accepts orders for L-series products. October 29, 2027 | Production discontinuation | Production stops. No new units are manufactured after this date. The window between the first date and the second date is the order acceptance period: a full year in which you can still place orders, but only against a make-to-order schedule. Anyone who needs new L-series hardware for a project that will run past 2027 should treat September 30, 2027 as the real last-chance date for factory-fresh units.   Why Mitsubishi Electric is ending the line   The stated reason in the bulletin is concise: some component parts used in the L-series are obsolete, and continued production is difficult to maintain. That language matters. When a PLC family depends on semiconductor, connector, and passive components that are no longer manufactured, the vendor cannot sustain production no matter how strong the demand is. The calendar in the bulletin reflects a supply decision, not a demand decision. For buyers, the reason sets expectations. This is not a temporary allocation issue that will resolve itself. The component base is gone, the product line is being wound down on a fixed calendar, and the repair support window that follows is the final service horizon. Plans that assume the L-series will be available indefinitely will not survive contact with the calendar.   Full list of affected models   The bulletin names the entire L-series catalog. Every model in the family is affected, and the list below follows the bulletin's own grouping. Keep a copy of these tables next to your panel documentation: they are the reference list for the audit described later in this article.   CPU modules   Model | Notes L02CPU | CPU module L02CPU-SET | CPU set L06CPU | CPU module L06CPU-P | CPU with power supply L06CPU-P-SET | CPU set with power supply L06CPU-SET | CPU set L26CPU | CPU module L26CPU-BT | CPU with CC-Link master function L26CPU-BT-SET | CPU set with CC-Link master function L26CPU-P | CPU with power supply L26CPU-PBT | CPU with power supply and CC-Link master function L26CPU-PBT-SET | CPU set with power supply and CC-Link master function L26CPU-P-SET | CPU set with power supply L26CPU-SET | CPU set All fourteen CPU variants move on the same dates. The SET versions ship as configured packages, and the P variants integrate the power supply into the CPU unit. The BT and PBT variants carry CC-Link master functionality, which becomes a deciding factor in the migration analysis later in this article.   Branch and extension modules   Model | Function L6EXB | Branch module L6EXE | Extension module LC06E | Extension cable LC10E | Extension cable LC30E | Extension cable The branch and extension modules are on the no-replacement list in the bulletin, so systems built with multi-rack L-series layouts face a redesign when the time comes.   Power supply modules   Model | Function L61P | Power supply module L63P | Power supply module The L61P has no MX-F counterpart. The L63P has a nominal counterpart, but the wiring is incompatible, as detailed in the replacement section below.   I/O modules   Model | Type LX40C6 | Input module LX41C4 | Input module LX42C4 | Input module LX10 | Input module LY10R2 | Output module LY18R2A | Output module LY40NT5P | Output module LY41NT1P | Output module LY42NT1P | Output module LY40PT5P | Output module LY41PT1P | Output module LY42PT1P | Output module LH42C4NT1P | High-speed I/O module LH42C4PT1P | High-speed I/O module The LX10 AC input module is one of the models with no replacement in the bulletin. Machines that read AC signals through an LX10 need a different input strategy during migration.   Analog I/O modules   Model | Type L60AD4 | Analog input module L60ADVL8 | Analog input module L60ADIL8 | Analog input module L60DA4 | Analog output module L60DAVL8 | Analog output module L60DAIL8 | Analog output module L60AD2DA2 | Analog input/output module L60TCTT4 | Temperature input module L60TCRT4 | Temperature input module L60TCTT4BW | Temperature input module L60TCRT4BW | Temperature input module L60RD8 | Analog input module L60MD4-G | Analog module This is the group where the bulletin's compatibility warnings are the strictest. Every analog and temperature module in this table requires a full re-engineering effort in any migration, because the suggested FX5 replacements are fully incompatible with the L-series analog line.   Positioning modules   Model | Type LD75P1 | Positioning module LD75P2 | Positioning module LD75P4 | Positioning module LD75D1 | Positioning module LD75D2 | Positioning module LD75D4 | Positioning module The LD75 family connects through a 40-pin connector, and the suggested FX5 path uses screw terminals. Motion axes built on these modules need a new wiring plan before any hardware swap.   High-speed counter and flexible I/O modules   Model | Type LD62 | High-speed counter module LD62D | High-speed counter module LD40PD01 | Flexible I/O module   Network modules   Model | Type LJ61BT11 | Network module LJ71C24 | Network module LJ71C24-R2 | Network module LJ71E71-100 | Network module LJ71GF11-T2 | Network module LJ72GF15-T2 | Network module LJ72MS15 | Network module   Other modules and accessories   Model | Type LJ51AW12AL | AnyWireASLINK master module L6ADP-R2 | Adapter L6ADP-R4 | Adapter L6DSPU | Display unit L6EC | END cover L6EC-ET | END cover with ERR terminal L6TE-18S | Spring clamp terminal block The LJ51AW12AL stands out in this group for a different reason: it is the only model in the entire L-series catalog with a shortened repair support window, which is covered in the next section.   Repair support: seven years, with one exception   Repair support for the MELSEC-L series runs until October 31, 2034, seven years after the production stop, for every model except one. The exception is the LJ51AW12AL AnyWireASLINK master module. Because it was jointly developed with Anywire Corporation, its repair support ends much earlier: October 31, 2028, one year after production ends. Model group | Repair support until All MELSEC-L models except LJ51AW12AL | October 31, 2034 LJ51AW12AL (AnyWireASLINK master, joint development with Anywire Corporation) | October 31, 2028 The bulletin includes a caveat that buyers should not miss: even during the repair support window, repair may be impossible if the required parts are no longer available. Repair support is a commitment to service units, not a guarantee that every repair succeeds. For critical machinery, treat the repair window as a planning horizon, not a safety net. The practical consequence for AnyWireASLINK users is severe: the LJ51AW12AL has a one-year repair horizon after production stops, so spare modules for that specific card deserve priority on any stocking list.   Replacement path 1: MELSEC MX Controller MX-F   The primary migration direction for MELSEC-L CPUs in the bulletin is the MELSEC MX Controller MX-F family. The MX-F models listed as the L-series counterparts are: MXF100-8-N32, MXF100-8-P32, MXF100-X32, MXF100-Y16R, MXF100-Y32N/P, MXF100-H32N/P, MXF100-16-N32, and MXF100-16-P32. The MX-F is a newer, faster controller family, and the specification deltas are large in both directions. Some numbers improve dramatically. Others get smaller, and a few functions disappear entirely. That is the difference between a migration and a drop-in replacement. The MX-F is not a socket-compatible swap for the L-series, and the tables below show exactly where the gaps are.   L02CPU to MXF100-8-N32   Feature | L02CPU | MXF100-8-N32 Max I/O points | 1024 | 512 Program capacity | 20K steps | 200K steps Instruction speed | 40 ns | 1.25 ns Memory | 80 KB | 30 MB Ports | USB mini-B + Ethernet | USB Type-C + Ethernet + CC-Link IE TSN The program capacity jump from 20K to 200K steps and the speed jump from 40 ns to 1.25 ns are the headline numbers. The I/O ceiling drops from 1024 to 512 points, which is a real constraint for larger machines. The port layout changes completely: USB mini-B and Ethernet give way to USB Type-C, Ethernet, and CC-Link IE TSN. Differential input capability is lost on the MX-F, which matters for any application that used differential inputs on the L-series.   L26CPU to MXF100-8-N32   Feature | L26CPU | MXF100-8-N32 Max I/O points | 4096 | 512 Program capacity | 260K steps | 200K steps Instruction speed | 9.5 ns | 1.25 ns The L26CPU comparison shows the tradeoffs most clearly. I/O capacity drops from 4096 to 512 points. Program capacity drops from 260K to 200K steps, the rare case where the migration target has less program space than the original. Speed improves from 9.5 ns to 1.25 ns. The L26CPU-BT and L26CPU-PBT models carry CC-Link master and local station functions, and those functions are not available on the MX-F at all. If your application depends on CC-Link master capability from the CPU, the MX-F path closes that door.   Modules with no replacement   The bulletin is explicit that some L-series modules have no replacement in the MX-F line: L6EXB, L6EXE, LC06E, LC10E, LC30E, LX10, and L61P. For systems that use branch modules, extension modules, extension cables, AC inputs, or the L61P power supply, there is no MX-F counterpart. Those functions have to be redesigned or handled by a different family, and the affected machines should be flagged first in any spares plan.   The L63P power supply caveat   The L63P has a nominal counterpart in the MX-F line: the power options on the MXF100-8-N32, MXF100-8-P32, MXF100-16-N32, and MXF100-16-P32. The bulletin warns that the wiring is incompatible. The L63P uses screw terminals; the MX-F uses spring clamp terminals. Wire size changes from 0.75-2 mm² to 0.3-1.5 mm². The 5V output drops from 5.0 A to 0.72 A. A panel built around the L63P cannot reuse its wiring or its 5V budget, so the power supply swap is a panel modification, not a module exchange.   Analog I/O: fully incompatible   For analog I/O, the replacement direction in the bulletin points to the FX5 family: FX5-4AD, FX5-8AD, FX5-4DA, and FX5-4LC. The bulletin's position is blunt: these modules are fully incompatible with the L-series analog modules. Wiring differs, programs differ, buffer memory addresses differ, and specifications differ. Replacing an L60AD4 or an L60TCTT4 with an FX5 module is a full engineering change, not a card swap. Every analog channel has to be re-engineered, rewired, and reprogrammed, and the buffer memory addressing differences mean the PLC program itself cannot carry over.   LD75 positioning: wiring change required   The LD75 positioning modules map to the FX5-16ET and FX5-16ES-H, but again the wiring is incompatible. The LD75 connects through a 40-pin connector; the FX5 modules use screw terminals. Any motion axis that runs on an LD75 module needs a new wiring plan and a new program before the hardware swap can happen.   Replacement path 2: MELSEC iQ-R   The second migration direction is the MELSEC iQ-R platform. The bulletin notes that the R00CPU can replace L02CPU-class CPUs, with tradeoffs. The R61P is the power supply option, and the RC06B, RC12B, and RC30B cables replace the L-series extension cables. For serial communication, the RJ71C24-R2 and RJ71C24-R4 adapters are the counterparts to the LJ71C24 and LJ71C24-R2. Migration to iQ-R runs through GX Works3, and Mitsubishi Electric's reference document is the Q-to-iQ-R migration guide, L08510ENG. The guide was written for the Q-series path, and it carries over to L-series users because the two families share the same migration toolchain and much of the same program structure. The iQ-R route tends to suit sites that are already standardizing on iQ-R elsewhere in the plant. If the rest of the line runs iQ-R, moving the L-series machines to an R00CPU keeps one engineering environment and one set of spares. The MX-F route suits smaller machines where the higher program capacity and speed of the MX-F are useful, and where the I/O ceiling of 512 points is not a constraint.   What plants should do now   Three workstreams cover most of what needs to happen between now and September 30, 2026. Audit the installed base. Build the list of every L-series module in service, by model number and by site. The tables in this article give the full catalog, so the audit is a matter of walking the panels and matching what is inside them to the list. Pay attention to the modules with no replacement: L6EXB, L6EXE, LC06E, LC10E, LC30E, LX10, and L61P. Any machine that depends on those has no clean upgrade path, and its spares strategy is the priority. Order what you need before the transition. Until September 30, 2026, L-series hardware is still produced to stock. After that date, everything is make-to-order, lead times grow, and prices firm up. For projects already in the pipeline, place the orders now. For spares, buy the modules that are cheap to hold and hard to replace later. The order acceptance window runs to September 30, 2027, but ordering earlier means shorter lead times and better pricing. Plan the migration on a calendar. Decide, machine by machine, whether the path is MX-F, iQ-R, or a rebuild with a different family. The spec tables in this article settle the easy cases. Machines that need more than 512 I/O points, or that use CC-Link master functions, or that rely on differential inputs, will not fit the MX-F path without design changes. Analog-heavy machines face a full re-engineering job under either path, because the FX5 modules are fully incompatible and the MX-F has no direct analog counterpart. Put a migration date next to each machine and treat the repair support deadline as the backstop, not the plan.   The spare parts angle   For a site that buys Mitsubishi PLC spare parts, the MELSEC-L phase-out changes the buying calculus in three ways. First, timing. The make-to-order transition on September 30, 2026 is the point where lead times grow and prices firm up. Any L-series module that a site expects to need in the next five years is cheaper and faster to obtain before that date than after it. Second, the end of production. After October 29, 2027, no new L-series units exist. Every module bought from that point forward comes from surplus stock or the used market. PLC spare parts suppliers that hold L-series inventory become the only source of new-condition hardware, and that inventory does not get replenished. Third, the repair reality. The repair support window runs to October 31, 2034 for almost every model, but the bulletin states plainly that repair may be impossible if parts are unavailable. A long repair window does not create new units, and it does not guarantee that a failed module can be fixed. The only reliable protection for a critical machine is physical spares on the shelf, and that is doubly true for the LJ51AW12AL with its one-year repair horizon. The practical rule: buy the spares you need before September 30, 2026, hold the modules with no replacement path first, and treat every year of remaining service life as a year that needs hardware on hand. Compare your audit list against the Mitsubishi PLC spare parts catalog and close the gaps this quarter.   FAQ   When exactly does the MELSEC-L series go make-to-order? September 30, 2026. From that date, Mitsubishi Electric builds L-series units only against confirmed orders instead of producing to stock. How long can I still order new L-series units? Order acceptance runs from September 30, 2026 until September 30, 2027. That one-year window is the last chance to order factory-new hardware. When does production stop? October 29, 2027. After that date no new L-series units are manufactured, and supply comes only from stock, surplus, or the used market. How long does repair support last? Until October 31, 2034 for all models except the LJ51AW12AL. The bulletin also warns that repair may be impossible if the required parts are no longer available, so the window is not a guarantee. Why does the LJ51AW12AL have a shorter repair window? The LJ51AW12AL is an AnyWireASLINK master module developed jointly with Anywire Corporation. Its repair support ends October 31, 2028, one year after production stops. Can I swap an L26CPU for an MXF100-8-N32? Not as a drop-in. I/O capacity drops from 4096 to 512 points, program capacity drops from 260K to 200K steps, and the CC-Link master and local station functions of the L26CPU-BT and L26CPU-PBT are not available on the MX-F. Are the FX5 analog modules a direct replacement for the L60 series analog modules? No. The FX5-4AD, FX5-8AD, FX5-4DA, and FX5-4LC are fully incompatible with the L-series analog modules. Wiring, programs, buffer memory addresses, and specifications all differ. Which L-series modules have no replacement? L6EXB, L6EXE, LC06E, LC10E, LC30E, LX10, and L61P have no MX-F counterpart in the bulletin. What happens to my spares supply after October 29, 2027? Only surplus and used stock remains. Repair support continues, but it does not create new units. Sites that need L-series hardware for running machines should hold physical spares before the make-to-order date.   What to do this week   · Pull the L-series model list from your maintenance system and match it against the affected model tables in this article. · Flag every machine that uses L6EXB, L6EXE, LC06E, LC10E, LC30E, LX10, or L61P. Those have no replacement path and need spares first. · Check which CPUs are in the field: L02CPU, L06CPU, or L26CPU variants. The MX-F and iQ-R paths differ by CPU class. · List the analog and positioning modules in service. Every one of them means a full re-engineering job, so count them early. · Place orders for project hardware and critical spares before September 30, 2026, while units are still built to stock. · Put a migration date on each machine and a spares budget next to it. The September 30, 2027 order cutoff is the real last-chance date for new hardware. · Review the Q-series situation at the same time. The Q-series final order cutoff falls on the same day, September 30, 2026, so both families compete for the same spares market at the same moment. URL Slug: mitsubishi-melsec-l-phase-out-make-to-order-2026 -------------------------------------------------------------------------------------------- 🏢 About TZ Tech   TZ Tech is a leading supplier of industrial automation, electrical, instrumentation, and telecommunications components. We specialize in sourcing ready-to-ship distributor stock, allowing us to offer highly competitive pricing and short lead times. Thanks to our extensive inventory, we can even source rare and discontinued parts that are hard to find elsewhere.   🛡️ Our Quality Commitment   We understand that quality is your top priority. Every component undergoes a strict screening and inspection process so you can buy with absolute confidence. For legacy or discontinued parts, we believe in complete transparency and will always provide an honest, accurate report on the product's condition. Plus, all brand-new parts come backed by a full 1-year warranty.   ✉️ Get in Touch     Have a project or a part you need? Send us your inquiry today! Our team is dedicated to providing a fast response within 6 hours (excluding weekends).

August 31,2026

  Mitsubishi Electric has announced the end of production for 14 Universal model MELSEC-Q series CPU modules, and the final order window is already open and closing. Technical bulletin FA-A-0418-A, published on the company's website, sets September 30, 2026 as the last day Mitsubishi will accept orders for these CPUs. Production stops on October 30, 2026. From today, August 17, 2026, that leaves roughly six weeks for plant managers to audit the installed base, count the spares shelf, and place any final orders for new units. For any site still running Q03UD, Q06UD, Q13UD or Q26-class CPUs, this is a procurement deadline with a hard date, not a distant announcement that can wait until after the summer. The stated reason for the discontinuation is short and familiar to anyone who has managed aging automation. Some component parts used in these products are obsolete, and Mitsubishi can no longer maintain production of them. No performance defect is cited, no safety issue, no compatibility problem. The CPUs are being retired because the supply chain underneath them is being retired. That distinction matters for planning. This is not a recall and it is not an emergency, but it is a firm cutoff. After October 30, 2026, brand-new units of these 14 models will simply not be manufactured again. Repair support is a separate timeline, and the two should not be confused. Mitsubishi will continue to repair these CPUs until October 31, 2033, which is seven years after the production stop. A CPU that is already in service today can still be sent back for repair well into the next decade. But repair support only covers units that exist. It does not create new CPUs, and it does not help a plant that needs to add capacity, replace a damaged unit it never stocked, or build a new line around a Q series CPU. The difference between "I can repair what I own" and "I can buy what I need" is the whole planning problem in one sentence. Who does this touch? In practice, the Q series is one of the most widely deployed PLC families in industrial automation, and the fourteen models in this bulletin sit in the middle of that installed base. Packaging lines, material handling systems, water treatment plants and machine tool cells across Asia, the Middle East and Europe run on these CPUs every day. A plant manager reading this announcement probably has at least one of the fourteen models in service, and probably has a spare or two on a shelf somewhere. The question is whether the list is complete, and whether the decision about the future of those lines gets made now, while new units are still orderable, or later, when they are not. The six-week window is the operational heart of this news. September 30 is the acceptance cutoff, not the delivery date. A purchase order placed in the final days of September still has to be processed, scheduled and shipped, and plants that wait until the last week are betting on logistics they do not control. The working rule for this kind of deadline is simple: treat the order cutoff as if it were the delivery deadline, and plan backward from it. Six weeks is long enough to act and too short to postpone.   The 14 models and the numbers that matter   The bulletin covers seven CPU classes, each available in two versions, for a total of 14 affected models. The affected range runs from the Q03 class at the entry of the group up to the Q26 class at the top. Affected models (final order date September 30, 2026) Q03UDCPU / Q03UDECPU Q04UDHCPU / Q04UDEHCPU Q06UDHCPU / Q06UDEHCPU Q10UDHCPU / Q10UDEHCPU Q13UDHCPU / Q13UDEHCPU Q20UDHCPU / Q20UDEHCPU Q26UDHCPU / Q26UDEHCPU For a maintenance manager, the useful way to read this table is to find your own CPU class in it. The Q03 and Q04 classes are the entry tier of the group and typically carry the smaller machines and standalone stations. The Q06 and Q10 classes are the mid-range workhorses, the CPUs that show up on lines with substantial I/O and some motion. The Q13, Q20 and Q26 classes sit at the top of the affected range and run the biggest programs with the fastest scan requirements. Every one of those classes is in this bulletin, which means the phase-out is not a corner of the catalog. It is the backbone of the Universal family that many plants standardized on. The bulletin itself includes the performance context, and it is worth reading those numbers carefully. The Q26UDEHCPU, the top of the affected range, runs 260K program steps with a 9.5ns basic instruction speed and 1040KB of program memory. The recommended iQ-R replacement, the R32CPU, offers 320K program steps, a 0.98ns basic instruction speed and 1280KB of program memory, and it uses an SD memory card instead of the older SRAM, Flash or ATA card. The Q13UDEHCPU, with 130K program steps, moves to 160K steps on the iQ-R side, with the same jump in instruction speed from 9.5ns down to 0.98ns. The interface changes matter for the migration planning. In the move to iQ-R, the communication interface shifts from USB (miniB), RS-232 or Ethernet to USB (miniB) and Ethernet, and the memory card shifts from SRAM, Flash or ATA to SD memory card or extended SRAM cassette. These are the details that show up in commissioning, in the wiring plan and in the stores room, and they are the reason the migration guide exists. Operationally, the numbers describe headroom, and headroom is a planning input. A faster CPU with more program memory gives a line room to grow: more logic, tighter scan times, more data collection, more future capacity without another hardware change. A plant that is near the limit of its current CPU today has a different decision to make than a plant that is using a fraction of its capacity. The bulletin's comparison figures make that difference visible before any purchase order is written.   The timeline at a glance   · August 17, 2026: today. Six weeks of the order window remain. · September 30, 2026: last day Mitsubishi accepts orders for the 14 CPUs. · October 30, 2026: production of the 14 CPUs ends. · October 31, 2033: repair support ends, seven years after the production stop. There is a second phase-out running in parallel, and plants should plan them together. In a separate bulletin, FA-A-0466-A, Mitsubishi has also announced the discontinuation of the MELSEC-L series. The L series moves to make-to-order on September 30, 2026. Order acceptance for L series CPUs continues until September 30, 2027, production ends October 29, 2027, and repair support runs to October 31, 2034. The affected CPUs include the L02CPU, L06CPU and L26CPU families, and Mitsubishi points to the MELSEC MX Controller MX-F, the MELSEC iQ-F (FX5) or the iQ-R as replacement paths. A plant that runs both Q series and L series controllers now has two procurement windows to manage inside the same planning period, and the two announcements share a destination: the iQ-R platform appears as a replacement path in both.   What happens after October 30: the repair tail and the used market   Once production ends, the market for these CPUs changes shape. Three things happen, and they happen in a predictable order. First, the remaining new stock gets consumed. Distributors and system integrators hold whatever they already bought, and that inventory becomes the last source of brand-new units. After that stock is gone, it is gone. There is no second production run announced and no indication that one is planned. The last new units will carry a premium, because the number of buyers still looking will not shrink as fast as the inventory. Second, demand shifts to the surplus and used market, and this is where the operational risk concentrates. After an official phase-out date, prices for used and surplus CPUs typically rise, and so does the risk of counterfeits and relabeled units. The shortage creates room for traders who do not test, do not document provenance, and do not stand behind the hardware. In past phase-outs across the automation industry, plants that waited have paid premium prices for untested units from unknown sources, and some have paid twice for the same CPU because the first purchase failed during commissioning. The bulletin's own dates make the arithmetic visible: seven years of repair support means the installed base is expected to keep running for years, which means demand for these CPUs will outlive supply. Third, sourcing shifts from the manufacturer to stock and surplus channels. For a plant, that changes the procurement question from "what is the price" to "what is the provenance". A tested, documented, warrantied unit from a specialist supplier is a different product from a mystery board pulled off a decommissioned line. The same part number can be a low-risk spare or a lottery ticket depending on where it comes from, and the price difference between the two tells you very little about which one you are holding. Emergency buying is the most expensive way to discover all of this. The plant that realizes in March 2027 that it needs a Q13UDHCPU for a line that has stopped will pay whatever the market asks, on whatever timeline the seller offers, with no alternative and no negotiation position. The plant that bought its spares in August 2026 pays the normal price, holds tested inventory, and keeps the leverage on its side. That asymmetry is the entire business case for acting before September 30. Repair support deserves its own paragraph, because it is easy to overestimate. Repair support until October 31, 2033 means Mitsubishi will service units that are already in service, within the normal terms of such programs. It does not mean new units, it does not mean loaner units as a right, and it does not mean the repair loop is instant. A CPU that fails in 2029 goes into a repair channel, comes back after the repair cycle, and the line waits in between. For a plant running three shifts, that waiting time is exactly what the spare on the shelf is for. The repair tail is a safety net for the hardware you own, not a supply line for the hardware you need.   Three options for plants, with the operational tradeoffs   Option 1: Buy the spares you need now, before September 30 The first option is also the cheapest one to execute, because it uses the normal supply chain while it still exists. The work is an audit plus an order. Walk every line and list which of the 14 CPUs are in service. Then check the stores and list which are already stocked as spares. The gap between those two lists is your shopping list, and it is usually bigger than people expect, because spares get borrowed between lines, retired units get cannibalized, and the shelf inventory in the computer rarely matches the shelf inventory in the room. For the quantity, a common working rule on critical lines is one spare CPU per critical line, plus a small common pool for the rest of the plant. Lines that run three shifts get the spare. Lines with no redundant CPU get the spare. Lines whose failure stops downstream processes get the spare. Lines with a second line of identical hardware can share from the pool. The count is a judgment call, but the principle is not: the spare exists to convert an unplanned stop into a planned swap, and the swap is only as fast as the spare is close. A CPU in a cabinet two minutes from the line is inventory. A CPU in a warehouse two countries away is a hope. The budget conversation is easier than it looks. A CPU is a modest line item compared with the cost of an unplanned stop, which typically includes lost production, overtime for the maintenance crew, expedited freight, and the downstream cost of a line that restarts late against customer commitments. Framed that way, the question is not whether the spare is affordable. The question is whether the line can afford to wait for the used market to deliver. Spares bought now come out of this year's maintenance budget, which is the budget that exists. The same CPUs bought next year come out of an emergency line that may not exist, or may come with approval chains that take longer than the line can stay down. The tradeoff is honest. Buying spares keeps you on the Q platform, which is exactly the platform being phased out. You are buying time, not a future. But time is a legitimate purchase when the alternative is a rushed migration. For a plant with a mid-life line, a stable program, and no near-term reason to change the architecture, buying several years of repair-supported operation is a rational use of the budget line. The spares are the bridge; the question of what comes after the bridge can be answered next year, on a schedule you control.   Option 2: Step up to the High-speed Universal QnUDVCPU series   The second option is the like-for-like step. Mitsubishi's recommended replacement within the Q family is the High-speed Universal model QCPU, the QnUDVCPU series, with examples including the Q03UDVCPU, Q04UDVCPU, Q06UDVCPU, Q13UDVCPU and Q26UDVCPU. The name is the message: same family, same form factor, same platform. Operationally, this is the lowest-risk migration on the table. The QnUDVCPU sits in the same rack, uses the same base unit, the same power supply and the same I/O modules. The project is recompiled in GX Works2 rather than rewritten. There is no rewiring of the panel, no new drawings, no change to the field wiring, and typically no change to the spare parts strategy for I/O. The commissioning window is measured in days rather than weeks, and it can often be done inside a planned shutdown without touching the process side. For a plant manager, this is the option that fits into a weekend and a change request, not a project plan. The tradeoff is that you stay on a platform whose days are numbered by the same logic that ended the current generation. The QnUDVCPU series is the replacement today; at some point it will be the phase-out notice, and the component obsolescence that ended the Q03UD through Q26UDH generation will eventually catch the generation after it. What you gain is a clean, low-risk path that buys several more years of operation with repair support, and what you defer is the eventual move to a newer architecture. For a plant that is not ready to redesign, this is the pragmatic middle path, and it pairs naturally with Option 1: stock the current CPUs for the near term, then step the critical lines up to QnUDVCPU on the normal replacement cycle instead of waiting for a failure to force the decision.   Option 3: Migrate to MELSEC iQ-R   The third option is the full architectural move. Mitsubishi's other recommended path is the MELSEC iQ-R series CPU, the RnCPU family, with examples including the R04CPU, R08CPU, R16CPU and R32CPU. This is a genuine migration rather than a swap. The iQ-R platform means a new base unit, a new power supply, a new rack, and a different memory system built around SD memory cards and the extended SRAM cassette instead of the older SRAM, Flash or ATA cards. The performance numbers from the bulletin show why plants make this move: the R32CPU takes the Q26UDEHCPU's 260K program steps to 320K, its 1040KB of program memory to 1280KB, and its 9.5ns basic instruction speed down to 0.98ns. That is not incremental improvement; that is a different class of headroom, and it is the headroom the next decade of program growth will need. The engineering effort is real and should be budgeted as such. Mitsubishi publishes the MELSEC-Q Series to MELSEC iQ-R Series Migration Guide, reference L08510ENG, which is the working document for porting programs. Porting is not retyping; it is a review of every program block against a new platform, with new communication interfaces, from USB (miniB), RS-232 or Ethernet to USB (miniB) and Ethernet. The commissioning window is the biggest hidden cost. A migration touches the rack, the wiring plan, the program, the documentation and the training of the maintenance crew, and it should be scheduled against the shutdown calendar, not squeezed into one. Budget the engineering time, not just the hardware, because the hardware line item is the smaller number on that spreadsheet. The payoff is the longest runway. The iQ-R platform is the current generation, it is the destination Mitsubishi points to in both the Q and L phase-outs, and it carries the performance headroom the comparison numbers illustrate. For plants under pressure to strengthen OT security, there is a secondary argument worth one sentence: legacy Q series CPUs predate modern OT security expectations, and a phase-out milestone like this one gives a defensible reason to move to a current platform. The security case is a bonus on top of the supply case, not a replacement for it. The tradeoff is cost and risk concentrated in one window. Hardware, engineering hours, commissioning time and the possibility of process issues after cutover all land in the same period. The mitigation is sequencing: migrate one line first, run it in production, and use it as the template for the rest of the plant. Plants that treat iQ-R as a project rather than a purchase get the benefits. Plants that treat it as a purchase get a surprise, usually in the form of a commissioning overrun on a line that was never going to be available long enough.   What this means for the installed base and the spare parts market   The MELSEC-Q series is one of the most widely deployed PLC families in industrial automation, and a large share of that installed base runs exactly the CPU classes in this bulletin. The Q03UD, Q06UD, Q13UD and Q26-class CPUs are not rare hardware; they are the workhorses of a generation of production lines, and they are still running production today in packaging, material handling, water treatment and machine tool applications across Asia, the Middle East and Europe. Some of those lines were designed around the Q series a decade or more ago, and the control architecture has not changed since, because it did not need to. This bulletin changes that arithmetic for every one of them. The order cutoff does not reduce demand; it reduces supply. Demand stays wherever the installed base stays, and the installed base does not disappear on October 30. It keeps running, it keeps breaking, and it keeps needing CPUs. The result is a market where the manufacturer exits and the stock and surplus channels take over. For buyers, that means the quality of the supplier matters more than the price list. For a site sourcing Mitsubishi PLC spare parts, the practical checklist is provenance, testing, warranty and delivery time, in that order. A unit with documentation and a test record is worth more than a cheaper unit with a story. For plants that stocked early, the phase-out is a non-event. Their spares are on the shelf, their lines are covered, and they can watch the used market from the sidelines. For plants that did not, the phase-out shows up later as an emergency buy at premium prices, with the counterfeit risk layered on top. The difference between those two outcomes is a purchase order placed before September 30. The same logic applies to the wider PLC spare parts shelf: a plant that reviews its critical spares against this bulletin will find that the review pays for itself on the first line that would have stopped. The L series ripple should be part of the same plan. The MELSEC-L phase-out in bulletin FA-A-0466-A runs on a slightly longer clock, with order acceptance until September 30, 2027, but the make-to-order transition begins on September 30, 2026, the same day the Q order window closes. Plants that standardize on one platform across machines should look at the two announcements together, because the replacement paths overlap: the MELSEC MX Controller MX-F, the MELSEC iQ-F (FX5) and the iQ-R appear in the L series guidance, and the iQ-R appears in both bulletins. A plant that consolidates on iQ-R solves both phase-outs with one architecture, while a plant that buys Q spares and L spares separately is managing two supply chains that are both winding down.   The bottom line   The September 30, 2026 order cutoff for the 14 MELSEC-Q series CPUs is a date with consequences that compound. Miss it and the options narrow: new units disappear, the used market takes over, prices and counterfeit risk rise, and the only remaining certainty is the repair tail, which runs to October 31, 2033, but only for CPUs that already exist. Nothing about this announcement requires a panic, and everything about it requires a decision. The plants that lose on phase-outs are never the ones that heard the news late. They are the ones that heard it on time and treated it as next quarter's problem. The action list is short enough to fit on one page. Audit the plant and find every one of the 14 affected models, in service and in stores. Decide which lines get spares and how many, using the one-spare-per-critical-line rule as the starting point and the three-shift and no-redundancy lines as the priority. Place the order before September 30, and treat the cutoff as the delivery date, not the order date. Choose the replacement path for the medium term: QnUDVCPU for the low-risk step, iQ-R for the architectural move, and keep bulletin FA-A-0418-A and the L08510ENG migration guide in the project file either way. Six weeks is enough. It is enough to audit, enough to decide, enough to order. What it is not enough for is the alternative: discovering the problem in March 2027, on a stopped line, with a budget approval in one hand and a used-market quote in the other. The plants that treat this announcement as a procurement event will not notice the phase-out at all. The plants that treat it as a rumor will notice it exactly once, on the day the line stops. URL Slug: mitsubishi-q-series-phase-out-deadline-2026 -------------------------------------------------------------------------------------------- 🏢 About TZ Tech   TZ Tech is a leading supplier of industrial automation, electrical, instrumentation, and telecommunications components. We specialize in sourcing ready-to-ship distributor stock, allowing us to offer highly competitive pricing and short lead times. Thanks to our extensive inventory, we can even source rare and discontinued parts that are hard to find elsewhere.   🛡️ Our Quality Commitment   We understand that quality is your top priority. Every component undergoes a strict screening and inspection process so you can buy with absolute confidence. For legacy or discontinued parts, we believe in complete transparency and will always provide an honest, accurate report on the product's condition. Plus, all brand-new parts come backed by a full 1-year warranty.   ✉️ Get in Touch     Have a project or a part you need? Send us your inquiry today! Our team is dedicated to providing a fast response within 6 hours (excluding weekends).

August 21,2026

Siemens has published a firm end date for the first-generation SIMATIC S7-1200. In an advance notice dated June 30, 2026 (Siemens Industry Online Support entry ID 109996314), the company confirmed that the S7-1200 G1 will be officially declared phased out on November 1, 2026, and that G1 units will remain orderable as new parts only through September 30, 2027. At the same time, the successor platform, the SIMATIC S7-1200 G2, has reached delivery release (entry ID 109973175). For the maintenance engineers and procurement teams who keep G1-based machines running across packaging plants, water and wastewater facilities, and HVAC systems, those two dates are the most consequential product lifecycle information Siemens has published in years. The full timeline, the G2's pricing and capabilities, and a practical spare parts plan for the transition follow.   The announcement, in three numbers   Advance notice 109996314 is short, but three figures in it define the remaining commercial life of every G1 CPU, I/O module, signal board, and power supply in your plant: · November 1, 2026. The G1 is officially declared phased out. This is the formal end-of-life declaration, the date from which Siemens treats the platform as a legacy product in its systems. · September 30, 2027. The last date on which a G1 can be ordered as a new part. Between November 2026 and this date, the G1 remains fully orderable through normal channels. · Approximately nine years of spare parts supply after the order cutoff. Siemens' planning horizon for G1 spare parts runs to roughly 2036. Two details in that notice deserve close attention. First, the phase-out declaration is not the last order date. Siemens has structured the transition with a window of nearly one year after the declaration during which brand-new G1 hardware can still be purchased. Second, the spare parts commitment is long. Nine years of planned spares supply takes the platform well past the point where most of today's G1 machines will have been retired or migrated on their own schedules.   Why this matters: the G1 installed base   The S7-1200, launched in 2009, has been one of the most widely deployed compact PLCs of the last 15 years. It became the default controller for small and mid-sized machines across three of the most common plant environments in industrial maintenance: packaging lines, where it runs labelers, cartoners, and wrappers; water and wastewater treatment, where it sequences pumps, valves, and chemical dosing; and HVAC, where it coordinates air handling units, chillers, and building utilities. OEMs built it into equipment shipped to every region, and its combination of integrated Ethernet, a compact footprint, and TIA Portal engineering made it the entry point to Siemens automation for an entire generation of engineers. The geography of that installed base matters for the spare parts market. In the Middle East, the S7-1200 shows up in desalination plants, pumping stations, and oil and gas auxiliary systems, where equipment is specified for decades of service in harsh conditions. In the Americas, it is embedded in food and beverage packaging lines and in HVAC plant equipment that runs continuously. In Europe, it drives wastewater treatment trains and machine tools that must meet strict documentation and safety requirements. In every one of those regions, the maintenance organization inherits the phase-out decision whether or not it participated in the original purchase. The engineers who commissioned these machines in 2012, 2015, or 2019 are often the same people who will be asked to keep them running in 2030. That installed base is the reason a phase-out notice for a compact PLC is a real event rather than a paperwork formality. Industrial machines have service lives measured in decades, and most G1-controlled equipment will keep running on G1 hardware long after the last new CPU leaves a Siemens warehouse. A calendar date passing does not re-engineer a packaging line. Re-engineering happens when the line is rebuilt, the process changes, or a failed component can no longer be sourced at a reasonable price. That last scenario is the one to plan around. A single failed CPU in 2028 is an ordinary maintenance event. A single failed CPU in 2028 with no spare on the shelf, no new stock available from distributors, and a machine that cannot run without it is an unplanned rebuild with production downtime measured in weeks. What you buy and store before September 30, 2027 closes the gap between those two outcomes.   The G1 phase-out timeline at a glance   Date | Milestone | What it means in practice June 30, 2026 | Advance notice published (entry 109996314) | Siemens formally opens the G1 phase-out procedure; the planning window starts Now | S7-1200 G2 in delivery release (entry 109973175) | The successor platform is available to order; new designs should target G2 November 1, 2026 | G1 declared phased out | End-of-life status takes effect; G1 remains orderable as a new part September 30, 2027 | Last order date for new G1 | Final day to buy brand-new G1 CPUs and modules through normal channels October 1, 2027 | Spare-parts-only phase begins | No new G1 sales; supply is limited to spare parts and repair support Through ~2036 | Planned G1 spare parts supply | Siemens' published planning horizon: about nine years of spares after the 2027 cutoff Maintenance managers should put this table in front of anyone who budgets capital or spare parts spend. The date that matters for buying decisions is not November 2026, which only changes the product's official status. It is September 2027, which closes the door on new G1 hardware entirely. Reading the table correctly matters, because Siemens' phase-out nomenclature is easy to misread. The November 2026 declaration is a status change in Siemens' product lifecycle systems; it triggers catalog updates, pricing adjustments, and the formal transition to end-of-life handling. The September 2027 cutoff is the commercial event with real consequences for buyers. Between those dates, G1 orders are processed normally. After the cutoff, new-manufacture G1 units disappear from the supply chain, and the market shifts to the stock that distributors and specialist traders accumulated beforehand. That is the mechanism by which a well-documented phase-out still produces a tightening spare parts market: the official supply does not vanish overnight, but the pool of new units available to late buyers shrinks every month.   What the S7-1200 G2 brings   The G2 is not a cosmetic refresh of the G1. Siemens is positioning it as the successor across the compact controller range, and the delivery release note (entry 109973175) confirms it is shipping now through normal distribution. The engineering environment stays consistent: the G2 integrates in TIA Portal, so teams that already work in Siemens' toolchain do not need to learn a new one.   Performance, scalability, and data   Siemens cites improved performance and scalability, flexible machine safety, efficient motion control, and increased data transparency as the G2's headline advantages. For a plant engineer, that means a controller family with a wider performance span, more flexible safety functions, lighter motion-control engineering, and machine data that higher-level systems can read more readily.   Pricing: a concrete benchmark   Distributor listings in the United States put the SIMATIC S7-1200 G2 CPU 1214C DC/DC/DC, order number 6ES7214-1AH50-0XB0, at a list price of $395. That figure is a useful benchmark for budgeting a migration: the mid-range CPU of the new family is priced competitively for the compact PLC segment. Procurement teams should treat list price as a starting point, since actual quotes vary by region, volume, and distributor terms. The CPU price is a planning anchor, but a complete migration budget also includes the I/O and power supply hardware for the new cabinet and the engineering time for the project conversion. The free migration tool removes the software license cost from that equation, which for a multi-machine fleet is a meaningful line item that simply disappears.   Fail-safe capability in the CPU line   G2 CPUs include failsafe variants. The CPU 1214FC DC/DC/DC, order number 6ES7214-1AF50-0XB0, is the fail-safe counterpart to the standard 1214C, which means machine safety functions can be implemented on the controller itself rather than through a separate safety arrangement.   A new fail-safe I/O module   Siemens has also introduced the SM 1226 F-DI 4/F-DQ 2 (order number 6ES7226-6ME50-0XB0), a fail-safe module that combines fail-safe digital inputs and fail-safe digital outputs in a single unit. At 30 mm wide, the module is compact, and Siemens states that it reduces DIN rail space by roughly 60 percent compared with a comparable G1 fail-safe configuration. For panel builders and maintenance teams working in crowded cabinets, that reduction is a concrete, measurable benefit of moving safety I/O to the G2 platform.   Cybersecurity by design   The G2 adheres to IEC 62443-4-2, the international standard for security capabilities of industrial automation components. For plants operating under OT security programs or facing vendor security questionnaires, that adherence matters: a controller family that addresses component-level security requirements is easier to justify to corporate IT and security stakeholders than one that predates the standard.   A free migration tool   Siemens provides a free S7-1200 G2 migration tool (support entry ID 109986503) to help move existing projects to the new platform. The existence of an official, free migration path matters for planning: it removes a common barrier to upgrading, which is the cost and risk of re-engineering the application from scratch. Migration is still a project with its own testing and validation, but the tooling cost is zero. The practical workflow is to run the tool per project, review the report it generates for items that need manual attention, and validate the migrated program on the target G2 hardware before touching production. Siemens documents the tool's scope and known limitations in the support entry, and the migration report doubles as an engineering worklist. For plants that run standardized machine programs across multiple lines, one validated migration can be reused as the template for the rest of the fleet, which is where the real time savings appear.   What G1 owners should do now   No plant needs to panic-migrate a healthy fleet. The announcement calls for deliberate buying and planning decisions in the next 13 months, while new G1 hardware is still available. Five actions cover the essentials.   1. Stock critical G1 spares before September 30, 2027   Every G1 installation should have a defined set of critical spares on the shelf before the order cutoff. The minimum list is the components whose failure stops a machine: the CPU itself, the power supply, and every I/O module type in the machine's configuration. For plants with multiple identical machines, spare modules can be shared across the fleet, but the spares need to exist before October 2027, because after that date the only supply is whatever remains in distributor and specialist stock.   2. Buy the long-lead and unusual items early   Common modules will remain available in specialist channels for years, because the spare parts commitment runs to roughly 2036 and the aftermarket will carry the platform. Less common items are the real risk: signal boards, communication modules, and older I/O variants that were configured on machines a decade ago. These are the modules that disappear from stock first when a platform enters its spare-parts-only phase. If a machine uses a module that is not a current catalog item, that module should sit near the top of the stocking list.   3. Treat the 2027 cutoff as a migration planning deadline, not a migration deadline   Nothing in the Siemens announcement forces a plant to migrate in 2026 or 2027. The G1 will remain supportable through roughly 2036, and many plants will legitimately run G1 for years. But the September 2027 cutoff is the natural deadline for a different decision: which lines migrate to G2, and which lines stay on G1 with stocked spares. Lines that migrate should be scheduled while G1 spares are still cheap and plentiful, so that the same budget cycle can cover both the migration and the remaining G1 spares. Lines that stay on G1 need their spares purchased before the cutoff, full stop.   4. Use the free migration tool on one pilot project   The free G2 migration tool (entry 109986503) changes the economics of evaluating a migration. A plant can take one representative machine, migrate its project, and run it through validation at zero tooling cost. That pilot produces the two things every migration decision needs: a real estimate of engineering effort and a documented list of differences between the G1 and G2 environments. With those in hand, the rest of the fleet can be scheduled deliberately rather than in response to failures.   5. Audit the installed base before ordering   None of this works without an accurate inventory. Before any purchase order is placed, walk the plant and record what is actually in each cabinet: CPU order numbers, firmware versions, I/O module types, signal boards, and communication modules. Plants are routinely surprised by what a decade of small modifications leaves behind, including module variants that were never documented and spare parts that were already consumed and never replaced. The audit output is a stocking list ranked by failure criticality, and it is also the input the migration tool needs when a line is scheduled for conversion. The audit is unglamorous work, but it is the difference between buying the right spares in 2027 and discovering in 2028 that the one module nobody stocked is the one module that failed.   Why tztechio.com still sells G1 modules   The spare parts angle of this announcement is straightforward: demand for G1 modules does not end when Siemens stops selling them as new. It rises. Plants that did not stock before the cutoff will be looking for G1 CPUs, power supplies, and I/O modules for years afterward, because their machines still run on G1, and the planned spare parts supply, however generous, does not put a spare in every cabinet. That is why tztechio.com continues to carry first-generation S7-1200 modules alongside the newer platform. The Siemens section of the store lists G1 CPUs, I/O modules, signal boards, and power supplies, and the broader PLC category covers the rest of the automation spares market. The practical guidance for procurement is to compare what a plant holds in stock against its critical module list, and to place orders for the gaps before the September 2027 cutoff, while new G1 stock can still be bought at normal prices. After the cutoff, the same modules will trade in a thinner market where availability, not list price, is the deciding factor. For plants that are migrating, the same storefront covers the transition: it adds G2 CPUs and modules to the Siemens inventory as they reach distribution, alongside the G1 spares that will keep legacy lines running. Running both generations through one procurement channel simplifies the transition period, which is exactly the period most plants are entering now. Frequently asked questions Q: When is the S7-1200 G1 officially phased out? A: Siemens declared in advance notice 109996314 that the G1 will be officially declared phased out on November 1, 2026. The phase-out declaration is the formal end-of-life status; it does not stop sales by itself. Q: Can I still buy a new G1 CPU after November 1, 2026? A: Yes. The G1 remains orderable as a new part until September 30, 2027. The November 2026 date changes the product's official status, and the September 2027 date is the last order date for new G1 hardware. Q: How long will spare parts for the G1 be available? A: Siemens plans spare parts supply for approximately nine additional years after the September 30, 2027 order cutoff, which puts the planning horizon at roughly 2036. Q: What does the S7-1200 G2 cost? A: As a benchmark, US distributor listings show the G2 CPU 1214C DC/DC/DC (order no. 6ES7214-1AH50-0XB0) at a list price of $395. Failsafe variants such as the CPU 1214FC DC/DC/DC (order no. 6ES7214-1AF50-0XB0) are available as well. Actual quotes vary by region and distributor terms. Q: Is there a tool to migrate S7-1200 G1 projects to G2? A: Yes. Siemens provides a free S7-1200 G2 migration tool, documented in support entry ID 109986503. It works within the TIA Portal environment. Q: What is the SM 1226 F-DI 4/F-DQ 2? A: It is a new G2 fail-safe I/O module (order no. 6ES7226-6ME50-0XB0) that combines fail-safe digital inputs and fail-safe digital outputs in one 30 mm-wide module. Siemens states it reduces DIN rail space by roughly 60 percent compared with a comparable G1 fail-safe configuration. Q: Does the G2 meet modern cybersecurity requirements? A: The G2 adheres to IEC 62443-4-2, the international standard for security capabilities of industrial automation components, and integrates in TIA Portal. Q: Where can I buy G1 spare parts after the phase-out? A: Specialist automation parts suppliers such as tztechio.com continue to stock first-generation S7-1200 modules. The Siemens spare parts section and the PLC category cover G1 CPUs, I/O, and power supplies. Q: Should we migrate our G1 machines now, or keep them running? A: That is a per-plant decision, and the Siemens timeline leaves room for both answers. A machine that is running reliably, has stocked spares, and is not under pressure for new connectivity or security features can legitimately stay on G1 for years, supported by the spare parts supply that runs to roughly 2036. A machine that is being rebuilt, that needs cybersecurity features the G1 platform cannot provide, or that must exchange more data with higher-level systems is a candidate for G2 migration. The discipline is to decide deliberately, machine by machine, before September 30, 2027, rather than to let the cutoff force the decision later. Sources · Siemens Industry Online Support, advance notice 109996314 (June 30, 2026): S7-1200 G1 phase-out declaration, last order date September 30, 2027, and approximately nine years of planned spare parts supply. · Siemens Industry Online Support, delivery release note 109973175: S7-1200 G2 in delivery release. · Siemens Industry Online Support, support entry 109986503: free S7-1200 G2 migration tool. --------------------------------------------------------------------------------------------------------------------------------------------------------------------   🏢 About TZ Tech   TZ Tech is a leading supplier of industrial automation, electrical, instrumentation, and telecommunications components. We specialize in sourcing ready-to-ship distributor stock, allowing us to offer highly competitive pricing and short lead times. Thanks to our extensive inventory, we can even source rare and discontinued parts that are hard to find elsewhere.   🛡️ Our Quality Commitment   We understand that quality is your top priority. Every component undergoes a strict screening and inspection process so you can buy with absolute confidence. For legacy or discontinued parts, we believe in complete transparency and will always provide an honest, accurate report on the product's condition. Plus, all brand-new parts come backed by a full 1-year warranty.   ✉️ Get in Touch   Have a project or a part you need? Send us your inquiry today! Our team is dedicated to providing a fast response within 6 hours (excluding weekends).

August 10,2026

The largest operational technology (OT) security incident of 2026 unfolded over six weeks this spring. Between March and mid-April, Iranian hackers systematically targeted nearly 4,000 internet exposed Rockwell Automation and Allen-Bradley PLCs across US critical infrastructure. The campaign prompted a joint federal advisory from CISA, the FBI, NSA, DOE, EPA, and US Cyber Command on April 7, followed by a Censys exposure report on April 10. Engineers running legacy Rockwell systems (SLC 500, PLC-5, older MicroLogix) should pay attention. This attack was years in the making.   What Happened: A Timeline of the 2026 Campaign   March 2026. Iranian threat activity against US critical infrastructure escalated sharply. Attackers aligned with two principal groups, the IRGC-linked CyberAv3ngers and the MOIS-linked Handala, began systematic reconnaissance of internet facing industrial control devices. Their target was Rockwell Automation PLCs exposed on port 44818 via EtherNet/IP. April 7. CISA, the FBI, NSA, DOE, EPA, and US Cyber Command issued a joint advisory confirming attackers had extracted project files from compromised devices, manipulated HMI and SCADA displays, and deployed wiper malware. At least one water facility was forced to manual operation after losing PLC control. April 10. Censys published exposure data showing 5,219 global hosts responding as Rockwell or Allen-Bradley devices reachable via EtherNet/IP, approximately 3,900 inside the United States. The vast majority were simply connected to the public internet with default settings. The attackers were not exploiting zero-days. They used Shodan and Censys to find Rockwell-branded PLCs on the public internet, then attempted default credentials and direct EtherNet/IP command exploitation.   Which Devices Were Targeted   Any Rockwell Automation or Allen-Bradley PLC with Ethernet connectivity exposed to the public internet was a viable target. Affected models included ControlLogix (1756 series, the flagship widely deployed in critical infrastructure), CompactLogix (1769, 5370, 5380 series, common in mid-size manufacturing and utilities), MicroLogix (1100, 1400 series, older and widely used in smaller facilities and remote sites), SLC 500 with Ethernet (designed in the 1990s with no meaningful security features), and PLC-5 with Ethernet (a 1980s design still running in oil and gas, water, and heavy industry). The attackers did not need advanced capabilities. EtherNet/IP implements minimal authentication by design, and many sites had never changed default passwords, disabled unused CIP services, or added a firewall between their PLCs and the carrier network.   Why This Matters for Legacy PLC Users   The 2026 Rockwell campaign exposes a structural vulnerability deferred for two decades. Hundreds, possibly thousands, of SLC 500 and MicroLogix systems remain in active service across American water plants, energy sites, and factories. These controllers were designed before internet-connected PLCs were imagined. They have no cryptographic authentication, no secure boot, no role-based access control, and often no firmware patching mechanism. You cannot patch a PLC-5. There is no update that retrofits encryption onto a SLC 500's serial-to-Ethernet bridge. The devices are what they are. This creates a hard deadline. The EU's NIS2 Directive requires compliance by October 2026, with substantial fines, and explicitly covers OT systems. While the US lacks a single equivalent regulation, sector-specific mandates from TSA, DOE, and EPA are moving in the same direction. Facilities running internet exposed legacy PLCs are increasingly in regulatory violation, and that was true before Iranian APT groups started fingerprinting their controllers. The April 7 joint advisory makes clear that federal agencies now consider these devices an active national security vector.   What to Do If You're Running Legacy Rockwell PLCs   Step 1: Audit every PLC on your network. Use Shodan, Censys, or OT asset discovery tools (Dragos, Nozomi, Claroty) to identify every Rockwell device on your public IP ranges. In the Censys scan, most exposed devices were not intentionally exposed. They sat behind misconfigured firewalls or were connected for remote troubleshooting and never disconnected. Step 2: Remove PLCs from the public internet. Place every Rockwell PLC reachable on port 44818 behind a properly configured firewall. For remote access, use a cellular modem with VPN, not a direct Ethernet drop. Air-gap critical controllers where possible. Step 3: Upgrade where feasible. Newer CompactLogix 5380 and 5480 series controllers offer trusted-slot authentication, CIP security extensions, and firmware integrity verification. Step 4: For truly legacy platforms such as SLC 500 and PLC-5, accept that you cannot patch them. You have three options. Network segmentation with unidirectional gateways uses data diode or unidirectional gateway appliances to allow monitoring traffic out while preventing any inbound commands from reaching the controller. Migration to a current platform uses Rockwell's migration programs for SLC 500 to CompactLogix and PLC-5 to ControlLogix, which are mature but require downtime planning. Hardening in place is possible if migration is not immediate: change all default passwords, disable unused EtherNet/IP services, restrict access via ACLs, and monitor EtherNet/IP traffic for anomalous commands. None of these are perfect. But any is better than having an Iranian APT group extract your project files and overwrite controller firmware at 2 AM on a Saturday.   The Spare Parts Angle   As facilities scramble to secure or migrate aging Rockwell systems, demand is increasing for spare ControlLogix and CompactLogix modules (1756, 1769 series) for swap-in replacements of potentially compromised units, Ethernet security appliances (bump in the wire devices that add authentication and traffic inspection without controller firmware changes), legacy-to-current migration kits (adapters, chassis, and power supplies for SLC 500 to CompactLogix swaps), and hard to find Allen-Bradley modules for facilities maintaining legacy spares during multi-year migrations. TZTechio's inventory, from current 5380-series CompactLogix to legacy 1746 and 1771 I/O, covers this range. When a water plant needs a 1756-L73 by Wednesday, availability matters.   Wider Context: OT Attacks Are Accelerating   The 2026 Rockwell campaign did not happen in isolation. It is the latest in a series of OT incidents that have escalated since 2023. The Unitronics attacks (2023-2024) were Iranian-linked attacks on Israeli-made Unitronics PLCs in US water utilities using the same playbook of Shodan scans, default credentials, and taking control. The Stryker 80,000-device wipe (March 2026) happened weeks before the Rockwell campaign and wiped 80,000 endpoints from medical device infrastructure. It was not an OT incident, but it proved that safety critical fleets are in the crosshairs. The NIS2 deadline (October 2026) has EU member states scrambling to meet requirements for mandatory incident reporting, supply chain security, and OT risk management. US regulatory push will follow in 2027. Attackers have learned that industrial control systems are the weak point of critical infrastructure. The 2026 Rockwell campaign proves you do not need nation-state resources to compromise most PLCs. You just need a Shodan query and the willingness to try default passwords. For anyone responsible for a legacy Rockwell system, the time for planning is over. Audit your controllers. Disconnect them from the internet. If you cannot protect them, migrate them, before someone else does it for you. --- *Sources: CISA/FBI/NSA/DOE/EPA/US Cyber Command Joint Advisory, April 7, 2026; Censys Research Report, April 10, 2026; BleepingComputer; CNN; Defense One. This article is for informational purposes and does not constitute cybersecurity or compliance advice. Consult qualified professionals for your specific environment.*

July 28,2026

  CHICAGO — June 23, 2026 — Schneider Electric took the stage at Automate 2026 today to announce "Industrial Automation Modernization as a Service," a new offering that pairs EcoStruxure Automation Expert (EAE) software with HPE SimpliVity hybrid cloud infrastructure. The service is built around a simple premise: let plants running legacy PLC and DCS systems modernize incrementally — without forklift upgrades or full rip-and-replace projects. For the thousands of facilities still operating Modicon Quantum, Premium, and M340 controllers, the core question is whether this changes anything about the hardware they depend on today.   What the Service Delivers   The architecture combines Schneider's IEC 61499-based EcoStruxure Automation Expert with HPE's hyperconverged SimpliVity platform. Automation logic runs as software-defined workloads rather than being locked to specific programmable logic controller hardware. Both companies are members of the UniversalAutomation.org consortium, and they are positioning the service as a path toward runtime portability across hardware layers. Schneider's announcement included several performance targets for the new model: · 50% faster time to market for new production lines · 60% faster commissioning through templated, repeatable deployment patterns · Up to 40% energy reduction via optimized compute allocation · Unified cloud cybersecurity governance across distributed sites · CapEx-to-OpEx conversion — plants pay for automation as an operational service rather than a capital equipment purchase The service supports multiple deployment models — on-site, private cloud, and distributed edge architectures — giving plant operators flexibility in how they phase in the new technology.   How It Works Alongside Existing Systems   Schneider is not requiring that existing PLCs be removed. The Modernization-as-a-Service model runs alongside current automation infrastructure, coexisting with existing Modicon Quantum, Premium, and M340 racks while plant operators transition specific functions to the new software-defined environment at their own pace. A facility can, for example, keep its Modicon Quantum rack with a 140 CPU 53414 processor handling core sequence control while migrating data aggregation, analytics, or higher-level coordination logic to the EAE/HPE platform. The same principle applies to Modicon Premium systems using TSX P57 processors and M340 controllers — the new architecture complements rather than replaces them in the short to medium term. Schneider's press materials, reported by Automation World and distributed via PRNewswire, describe the service as built for "the reality of brownfield automation" — acknowledging that most industrial sites cannot afford production downtime for a full system swap.   Spare Parts Implications   For maintenance and procurement teams, the practical effect of this announcement is clearer than the press materials may suggest.   Short Term: Demand Holds Steady — and May Increase   In the near term, the availability of Modernization-as-a-Service does not reduce the need for replacement parts. If anything, the opposite is true. An incremental migration strategy means legacy Schneider hardware stays in production longer than it would under a full rip-and-replace plan. Each year a Quantum or Premium system remains operational creates ongoing demand for: · Replacement processors (140 CPU 53414 for Quantum racks, TSX P57 for Premium) · Communication modules such as the 140 NOE 77101 Ethernet module · Power supplies, backplanes, and I/O modules · Racks and cabling for expansion Plant operators pursuing phased modernization typically maintain larger spare parts inventories during the transition period, not smaller ones. A controller that might have been decommissioned in a single weekend under a full replacement project now stays online for months or years as functions migrate one by one.   Long Term: A Gradual Shift Toward Software-Defined Automation   Over a five-to-ten-year horizon, the broader trend points toward decoupling automation logic from specific hardware SKUs. The IEC 61499 standard that underpins EAE allows control code to run on diverse hardware platforms — standard servers, edge appliances, or even cloud instances — rather than being tied to a specific vendor's processor module. For the spare parts market, this means demand for legacy PLC modules will eventually taper — but the taper is measured in years, not quarters. The installed base of Modicon Quantum systems alone has been in production since the 1990s and is not going away overnight. Many of these systems run in capital-intensive industries such as oil and gas, water treatment, and power generation, where control system replacement cycles routinely span a decade or more.   Three Product Families in Scope   The announcement has direct relevance to users of three Schneider PLC families: Modicon Quantum: This long-running platform includes the 140 CPU 53414 processor and the widely deployed 140 NOE 77101 Ethernet communication module. Quantum racks remain common in process industries, and the incremental modernization path means these parts will continue to be specified for maintenance and sparing. Modicon Premium (TSX): The TSX P57 processor family, still operational in thousands of installations globally, is another candidate for gradual migration. Premium systems often run critical processes where downtime is measured in millions of dollars per hour — a strong incentive for cautious, phased transitions. Modicon M340: A mid-range platform popular in hybrid manufacturing, M340 installations are newer on average but still benefit from the same incremental approach. These systems may be among the first to see partial migration as operators gain confidence with the new architecture.   Industry Context   The Schneider-HPE partnership signals a broader industry shift toward treating automation as an IT-managed service rather than a standalone OT deployment. By embedding EAE on HPE SimpliVity, the companies are betting that plant operators will want the same consumption-based pricing and infrastructure flexibility they get from enterprise cloud services. Schneider's membership in UniversalAutomation.org alongside HPE is central to the strategy. The organization promotes a common runtime environment based on IEC 61499, allowing automation applications to move between hardware platforms from different vendors. This is the foundation that makes Modernization-as-a-Service technically feasible — and it represents a longer-term move toward portable, vendor-independent industrial control software. Schneider Electric announced the service is available immediately for new deployments, with phased migration support for existing sites rolling out through the remainder of 2026. Coverage from Automation World and the company's own press release provided the details.   What It Means for Parts Availability   Modernization-as-a-Service does not make legacy PLC parts obsolete. For the industrial automation spare parts market, the practical effect is a longer, more gradual transition that sustains demand for replacement modules, processors, and communication cards for years to come. The cautious pace of brownfield automation — where production uptime takes priority over architectural purity — means Modicon Quantum, Premium, and M340 components will remain in active use and active demand well into the next decade. ------------------------------------------------------------------------------------------------------------------- 🏢 About TZ Tech   TZ Tech is a leading supplier of industrial automation, electrical, instrumentation, and telecommunications components. We specialize in sourcing ready-to-ship distributor stock, allowing us to offer highly competitive pricing and short lead times. Thanks to our extensive inventory, we can even source rare and discontinued parts that are hard to find elsewhere.   🛡️ Our Quality Commitment   We understand that quality is your top priority. Every component undergoes a strict screening and inspection process so you can buy with absolute confidence. For legacy or discontinued parts, we believe in complete transparency and will always provide an honest, accurate report on the product's condition. Plus, all brand-new parts come backed by a full 1-year warranty.   ✉️ Get in Touch     Have a project or a part you need? Send us your inquiry today! Our team is dedicated to providing a fast response within 6 hours (excluding weekends).

July 20,2026