October 1, 2026: Siemens Cuts Off Spare Parts for the Most Common HMI Panels of the Last 15 Years
September 01, 2026
*News analysis for plant managers | August 31, 2026*
October 1, 2026 is the date Siemens stops guaranteeing spare parts for the most common HMI panels of the last 15 years. The KTP400 Basic on your filling line, the TP177B on your packaging machine, the MP 277 in the control cabinet of your skid loader, the Mobile Panel 177 your setup crew carries between stations. All of them move to P.M490 on that date, and P.M490 means one thing in practice: availability becomes stock-only, and nobody has to restock it.
If you have not counted these panels yet, this is the week to do it. A dead 6-inch TP177B on a running line can cost more in lost production per hour than a spare panel costs per unit. A stopped production line typically costs hundreds to thousands of dollars per hour, depending on the industry. One spare panel per critical machine is not an expense. It is insurance.
Siemens published the status change on August 26, 2026 in Industry Online Support entry 109486162, titled "Status change for SIMATIC HMI products." The changes take effect on two dates: September 30, 2026 and October 1, 2026. The affected products span the KTP Basic generation, the classic x77 family, and the Mobile Panel line. Together they cover a large share of the HMIs installed on industrial machines since the mid-2000s.
Siemens runs every product through lifecycle milestones. Three of them matter here.
P.M400 is the phase-out announcement. Siemens tells the market that a product is entering phase-out. You can still order it and get normal support, but the clock starts running on its life.
P.M410 is the type cancellation. Siemens cancels the product type and stops accepting orders. The supply chain winds down to whatever is already in it.
P.M490 is the product discontinuation and the end of the spare-parts obligation. The product is no longer available, support is discontinued, and Siemens is no longer obligated to supply spare parts. Warranty claims on products already sold continue to be processed.
For the panels in this article, that sequence has been running for years. The final order dates for the x77 generation and the Mobile Panels 177/277 were around October 2014. Machines built with those panels have been in service for 15 years or more. October 1, 2026 is the last step in the sequence. After that date, the guaranteed supply of spare parts ends.
Two dates matter. September 30, 2026 is the type cancellation for four Multi Panel models. October 1, 2026 is the discontinuation for the KTP400/600 Basic panels, the x77 family, and the Mobile Panels, plus the phase-out announcement for two KP Basic panels.
One more piece of context belongs in this picture. The Comfort generation, which was supposed to replace the x77 family, is itself in phase-out. The Comfort Panels (KP400, KTP400, KP700, TP700, KP900, TP900, KP1200, and TP1200 Comfort, plus the Comfort PRO panels TP1200, TP1500, TP1900, and TP2200) reached P.M400 on January 31, 2026. That was seven months ago. If you deferred a Comfort Panel decision, you now have two generations moving at once.
The KTP400 and KTP600 Basic panels are the entry level of the WinCC Basic generation. They are everywhere in industry: small machines, compressors, packaging ancillaries, OEM control panels. Five order numbers reach P.M490 on October 1, 2026.
Model | Order number (MLFB) | Lifecycle event | Effective date
KTP400 Basic mono PN | 6AV6647-0AA11-3AX0 | P.M490 | October 1, 2026
KTP400 Basic Color PN | 6AV6647-0AK11-3AX0 | P.M490 | October 1, 2026
KTP600 Basic mono PN | 6AV6647-0AB11-3AX0 | P.M490 | October 1, 2026
KTP600 Basic Color DP | 6AV6647-0AC11-3AX0 | P.M490 | October 1, 2026
KTP600 Basic Color PN | 6AV6647-0AD11-3AX0 | P.M490 | October 1, 2026
If your plant runs KTP400 or KTP600 Basic panels, check the nameplate. The order number starts with 6AV6647. Any of these five numbers means the panel loses its guaranteed spare-parts supply in about a month.
The x77 family is the classic WinCC flexible generation. These are the panels mounted on machines across the Middle East, the Americas, and Europe since the mid-2000s: 6-inch, 8-inch, and 12-inch screens in key and touch versions. Six order numbers reach P.M490 on October 1, 2026.
Model | Order number (MLFB) | Lifecycle event | Effective date
TP177B 6" DP | 6AV6642-0BC01-1AX1 | P.M490 | October 1, 2026
OP177B 6" DP | 6AV6642-0DC01-1AX1 | P.M490 | October 1, 2026
TP 277 6" | 6AV6643-0AA01-1AX0 | P.M490 | October 1, 2026
OP 277 6" | 6AV6643-0BA01-1AX0 | P.M490 | October 1, 2026
MP 277 8" Touch | 6AV6643-0CB01-1AX2 | P.M490 | October 1, 2026
MP 377 12" Key | 6AV6644-0BA01-2AX1 | P.M490 | October 1, 2026
The TP177B deserves special attention in the audit. It is one of the most widely installed 6-inch HMIs in industrial history. A packaging line, a bottling line, a labeling machine, a small process skid: the TP177B is the face of all of them. The panel itself costs a fraction of what one hour of lost production on that line costs. That is the whole argument for buying the spare before October 1.
The Mobile Panels are the handhelds. The 177 and 277 series belong to the same WinCC flexible generation as the x77 family. If your maintenance crew uses a handheld to jog a crane, a transfer car, or a machine tool, these order numbers matter. All of them reach P.M490 on October 1, 2026.
Model | Order numbers (MLFB) | Lifecycle event | Effective date
Mobile Panel 177 DP | 6AV6645-0AA01-0AX0, 6AV6645-0AB01-0AX0, 6AV6645-0AC01-0AX0 | P.M490 | October 1, 2026
Mobile Panel 177 PN | 6AV6645-0BB01-0AX0, 6AV6645-0BC01-0AX0 | P.M490 | October 1, 2026
Mobile Panel 277 | 6AV6645-0CB01-0AX0, 6AV6645-0CC01-0AX0 | P.M490 | October 1, 2026
Mobile Panel 277 10" | 6AV6645-0BE02-0AX0 | P.M490 | October 1, 2026
Handheld panels take physical abuse. They get dropped and dragged across concrete, and the cable takes the worst of the abuse. The spare case for a Mobile Panel is stronger than for a fixed panel, because the failure rate on a handheld is simply higher. If you run these, hold a spare unit per crew, and hold spare connecting cables as well.
One day before the main event, four Multi Panel models hit P.M410, the type cancellation, on September 30, 2026.
Model | Order number (MLFB) | Lifecycle event | Effective date
MP 277 10" Touch | 6AV6643-0CD01-1AX1 | P.M410 type cancellation | September 30, 2026
MP 277 10" Touch | 6AV6643-0CD01-1AX2 | P.M410 type cancellation | September 30, 2026
MP 377 12" Touch | 6AV6644-0AA01-2AX0 | P.M410, then P.M490 | September 30 and October 1, 2026
MP 377 19" Touch | 6AV6644-0AC01-2AX1 | P.M410, then P.M490 | September 30 and October 1, 2026
For the MP 377 12" Touch and the MP 377 19" Touch, the two milestones sit on consecutive days: type cancellation on September 30, product discontinuation on October 1. For a buyer there is no practical difference. After September 30, orders go through whatever stock remains. The MP 277 10" Touch hits type cancellation on the same date with the same practical effect.
Two KP Basic panels do not reach P.M490 this year. They get the P.M400 phase-out announcement on October 1, 2026, and the P.M410 type cancellation follows one year later, on October 1, 2027.
Model | Order number (MLFB) | Status on October 1, 2026 | Next milestone
KP300 Basic mono PN | 6AV6647-0AH11-3AX1 | P.M400 phase-out announcement | P.M410 on October 1, 2027
KP400 Basic Color PN | 6AV6647-0AJ11-3AX1 | P.M400 phase-out announcement | P.M410 on October 1, 2027
These two still have a year of guaranteed availability. Fold them into the same audit now, so the buy-or-migrate decision is made while there is no pressure on it.
P.M490 is the end of the spare-parts obligation. Siemens is no longer required to supply spare parts for the product. The product is no longer available, and support is discontinued. Warranty claims on panels already sold continue to be processed.
For a plant manager, translate that into supply terms. After October 1, 2026, availability is stock-only. The guaranteed supply chain is closed. The panels that remain in distributor warehouses and integrator stockrooms are the entire supply. When that stock drains, the remaining sources are the used and surplus market and specialized suppliers of discontinued automation parts, like the HMI spare parts range at tztechio.com. Suppliers in that market exist precisely for this stage of a product's life.
Three consequences follow from stock-only availability.
First, the date matters more than the price. A KTP600 Basic bought in September at catalog price is a bargain compared with the same panel bought from remaining stock in November, if it can be found at all. Prices on discontinued industrial electronics tend to rise as stock drains. That is not speculation; it is how the market for phase-out parts behaves.
Second, stock drains unevenly. The most common models go first. The TP177B and the KTP600 Basic panels were fitted in huge numbers, so remaining stock of those exact order numbers is the first to disappear. If you run a common model, act accordingly.
Third, the installed base does not disappear on October 1. The machines keep running, and the panels keep failing at their normal rate. Demand for these parts continues for years. The guaranteed supply ends on a fixed date. That gap between continuing demand and ending supply is where the market for discontinued parts lives, and it is why this date deserves action now.
Do the arithmetic for one critical line. The panel on a machine fails, on average, once every several years, and it never fails at a convenient moment. A spare panel for this class of HMI typically costs a few hundred to a couple of thousand dollars, depending on the model and the market. One hour of lost production on the line costs hundreds to thousands of dollars. The comparison decides itself: the spare is cheap, the stop is not, and the stop is what you insure against.
The HMI changes do not arrive alone. October 1, 2026 carries lifecycle milestones across several Siemens product families at once. The cluster is documented in Industry Online Support entries published around August 26, 2026.
Product family | Lifecycle event | Effective date | Successor or note
SIMATIC HMI panels (this article) | P.M490 | October 1, 2026 | Comfort or Unified Comfort panels
Central S7-400 modules | P.M410 type cancellation | October 1, 2026 | Replacement platform ET 200SP HA
SIMOTION D | P.M410 type cancellation | October 1, 2026 | Migrate to SIMATIC T-CPU
Selected SINUMERIK 840D sl products | Cancelled | October 1, 2026 | SINUMERIK ONE is the successor
Selected S7-300 / ET 200M power supplies | Cancelled | October 1, 2026 | —
M200D motor starter 3RK1 | P.M410 | October 1, 2026 | —
SIMOTICS S-1FK7 servo motors | P.M400 | October 1, 2026 | Successors S-1FK2 and S-1FT2
SIMOTICS-M motors 1PM4/1PM6/1PH4/1PH6 | P.M500 end of product life | September 30, 2026 | Replacement 1PH8
For a plant manager, this cluster matters for two reasons. First, the S7-400 news. Central S7-400 modules reach type cancellation on the same day, with ET 200SP HA as the replacement platform. If your plant still runs S7-400 racks, the Siemens PLC spare parts question is live on the same date as the HMI question. Second, the cluster makes one audit efficient. The walk you do to count HMIs this week doubles as the audit for PLC modules, power supplies, motion controllers, and motors. The same walk covers all of it, and the same deadline applies.
One more date belongs in the cluster. The SIMOTICS-M motors 1PM4, 1PM6, 1PH4, and 1PH6 reach P.M500, the end of product life, on September 30, 2026, with 1PH8 as the replacement. P.M500 marks the last stage of the lifecycle. If you have those motors in service, they are already at the final milestone.
Here is the audit. It takes an afternoon, and it produces the decision list for the whole October 1 cluster.
1. Walk the plant. Every machine, every control cabinet, every operator station. Read the order number off the HMI nameplate and write it next to the machine name. The number you need starts with 6AV6.
2. Match every number against the tables in this article. Mark each panel as affected or not affected.
3. Check the spares shelf. For each affected panel, what do you actually hold? A spare panel unit, touch foils or front foils, backlight units, connecting cables, memory or transfer modules. Most plants hold less than they think.
4. Decide per panel and per machine: buy a spare, migrate the panel, or run it to failure and accept the risk. Write the decision down next to the machine's expected remaining life.
5. For every panel you keep running, place the spare order before October 1.
6. For every panel you migrate, start the conversion now, not in December.
Where do you find the order number? The full MLFB is printed on the nameplate on the rear of the panel, and on most of these models it also appears on the front label. If the machine is running, read the front label first. If it is not legible, the rear nameplate carries the full number. Do not rely on the WinCC project file alone. The project names the device, but the nameplate gives you the exact order number, and the exact order number is what the spare market matches.
The spare parts that matter for a panel in service go beyond the panel itself. Touch foils and front foils wear out from years of finger pressure. Backlight units dim and fail. Connecting cables break where they flex. Memory and transfer modules hold the project. A complete spare kit for one panel is the panel itself plus a front foil and a connecting cable. That kit costs a small fraction of one unplanned stop. If you need help sourcing any of it, the HMI spare parts catalog covers panels, foils, and accessories for the discontinued generations.
If a panel migrates, the direction of travel is clear.
For the x77 family and the Mobile Panels, the successor generation is the Comfort line, for example the TP700 Comfort or the TP900 Comfort, or the newer Unified Comfort Panels. Projects convert in WinCC (TIA Portal). The conversion is not always 1:1. Older faceplates and scripts often need rework, and the rework is engineering time. Budget for it, and test the converted project on a bench before it goes near a running machine.
For the KTP400/600 Basic and KP300/400 Basic panels, the choice is between the newer Basic Panels (second generation) and the Comfort line, depending on the application. A simple status display may not need the move to Comfort at all. A panel that runs recipes or trends probably does.
Check the details before you pick a successor. Screen size class, number of function keys, the fieldbus interface (PROFIBUS DP versus PROFINET), the mounting cutout, and the environmental rating all matter. A 6-inch panel in a control cabinet door has a cutout you want to match, or you pay for an adapter and a door rework on top of the panel itself.
Two practical notes on the migration plan. First, conversions run better when one person owns them. Assign the WinCC conversion for each machine to a named engineer. Second, do not migrate everything in one month. Stage the conversions machine by machine, and keep a spare panel for each machine until its conversion is proven. The spare is the safety net that makes staged migration safe.
The deadline is October 1, 2026, roughly a month from today. The work breaks into seven steps.
7. This week: count every HMI in the plant. Write the order number next to the machine name. You cannot decide what you have not listed.
8. This week: check the spares shelf against the list, and fill the gaps for the panels you will keep running.
9. By mid-September: make the buy-or-migrate decision for every affected panel, based on the machine's remaining life and its role in production.
10. Before October 1: place the spare orders. After the date, availability is stock-only, and prices on remaining stock tend to rise.
11. Before October 1: order touch foils, backlights, cables, and transfer modules for the panels you keep running. They fail before the panel does.
12. For migrations: start the WinCC conversion now, assign an owner per machine, and stage the cutover machine by machine.
13. Use the same audit for the rest of the October 1 cluster: central S7-400 modules, S7-300 and ET 200M power supplies, SIMOTION D controllers, selected SINUMERIK 840D sl products, M200D starters, and the SIMOTICS motors.
If your plant holds obsolete or hard-to-find automation parts in inventory, industrial automation parts sourcing is the backstop for anything you miss before the deadline. The market for discontinued parts does not close on October 1. The guaranteed supply does.
Can I still buy this panel after October 1, 2026?
After P.M490, the panels are no longer available from Siemens, and the spare-parts obligation has ended. Availability is stock-only. Whatever distributors and integrators still hold is the supply, and when it is gone, the remaining sources are the used and surplus market and specialized suppliers of discontinued automation parts. If you need a panel, buy it before the date, or be prepared to pay market prices after.
How long do I have?
For the KTP400/600 Basic panels, the x77 family, and the Mobile Panels, the cutoff is October 1, 2026, when P.M490 takes effect. For the MP 277 10" Touch and the MP 377 12" and 19" Touch, the type cancellation lands on September 30, 2026, one day earlier. For the KP300 and KP400 Basic, the P.M400 announcement lands October 1, 2026, and the P.M410 type cancellation follows on October 1, 2027.
Will my WinCC project transfer?
The x77 and Mobile Panel projects convert to Comfort or Unified Comfort Panels in WinCC (TIA Portal). The conversion is not always 1:1. Older faceplates and scripts may need rework. Plan the conversion as an engineering task with a bench test before the cutover, not as a file copy.
Should I buy spares or migrate?
Base the decision on the machine's remaining life. A machine with years of service ahead of it justifies both: a spare panel now for continuity, and a migration plan on a schedule you control. A machine near retirement justifies a spare only, because one spare panel costs less than the migration effort. Either way, compare the cost of the spare against the cost of one unplanned stop on that line. The comparison almost always favors the spare.
What happens to warranty claims after P.M490?
Warranty claims continue to be processed. P.M490 ends the obligation to supply spare parts and ends support for the product. Claims on panels already sold are handled normally.
What about Comfort Panels?
The Comfort generation is already in phase-out. The Comfort Panels and Comfort PRO panels reached P.M400 on January 31, 2026. If your migration path for the x77 family was "move to Comfort," the window is open, but the clock is running on that generation as well. Two generations are moving at once.
Is October 1, 2026 a one-off?
No. The same date carries type cancellations and phase-outs across central S7-400 modules, SIMOTION D, selected SINUMERIK 840D sl products, selected S7-300 and ET 200M power supplies, M200D motor starters, and SIMOTICS servo motors. The SIMOTICS-M motors 1PM4, 1PM6, 1PH4, and 1PH6 reach end of product life one day earlier, on September 30, 2026. One plant-wide audit covers the entire cluster.
October 1, 2026 is a supply date, not a machine failure date. The panels keep running after it. What changes is the guarantee behind them. Count the panels in your plant this week and decide per panel. Place the orders before the date. A stopped line costs more per hour than the spare panel costs per unit. One spare panel per critical machine is not an expense. It is insurance.
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