Lifecycle Database
SLC 500 and PLC-5 Discontinued Parts List (2026)
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Siemens S7-400 Discontinued Parts List (2026)
By TimControls Technical TeamPublished
Key takeaways
- On 1 October 2026 Siemens cancelled the S7-400 signal and function modules on this list (PM410), a year after announcing their phase-out.
- The same day it announced the phase-out (PM400) of the 414-3, 416-2, 416-3 and 416F-3 PN/DP, the last S7-400 CPUs on this list it still sold as active products.
- Older CPUs went years ago: the 412-2, 414-2 and 417-4 were cancelled in 2016, the 412-3H and 414-4H in 2017.
- Check the date on the exact order number: each SiePortal record has its own, and Siemens can change them.
Every S7-400 order number we track, with its Siemens status, the dates from Siemens’ record and a link to it, checked on 15 October 2026.
On 1 October 2026 Siemens cancelled the S7-400 signal and function modules on this list, a year after announcing their phase-out. The same day it announced the phase-out of the 414-3, 416-2, 416-3 and 416F-3 PN/DP, the last S7-400 CPUs on this list it still sold as active products.
Unlike the S7-300, the S7-400 has no single date for the whole range: some CPUs were cancelled in 2016, others are only now starting their phase-out. The date that matters is the one on the exact order number. This list gives it for each of the 32 order numbers we track, with the Siemens record behind it.
For the S7-300 and ET 200M, see the S7-300 part status list.
Where the S7-400 stands
SiePortal moves each order number through the same milestones. This list shows the latest one each order number has reached.
| Siemens milestone | As SiePortal shows it | Status on this list |
|---|---|---|
| PM400 | Phase-out announced | Phased out |
| PM410 | Product cancellation | Discontinued |
| PM490 | Product discontinued | Discontinued |
- 32
- order numbers tracked
- 28
- discontinued (PM410 or PM490)
- 4
- phase-out announced (PM400)
- 1 Oct 2026
- latest Siemens change
Last checked against Siemens SiePortal on 15 October 2026.
Key dates
Every Siemens milestone date across the order numbers on this list, newest first.
| Date | Siemens milestone | Order numbers |
|---|---|---|
| 1 October 2026 | PM490: product discontinued | 1: CPU 414-2 |
| 1 October 2026 | PM410: product cancellation | 23: SM 421, SM 422, SM 431, SM 432, FM 450-1, FM 451, FM 452, FM 455 C, FM 455 S |
| 1 October 2026 | PM400: phase-out announced | 4: CPU 414-3, CPU 416-2, CPU 416F-3, CPU 416-3 |
| 1 October 2025 | PM400: phase-out announced | 23: SM 421, SM 422, SM 431, SM 432, FM 450-1, FM 451, FM 452, FM 455 C, FM 455 S |
| 9 June 2025 | PM490: product discontinued | 1: CPU 414-4H |
| 1 February 2017 | PM410: product cancellation | 2: CPU 412-3H, CPU 414-4H |
| 1 December 2016 | PM410: product cancellation | 1: CPU 414-2 |
| 10 October 2016 | PM400: phase-out announced | 1: CPU 414-2 |
| 1 October 2016 | PM410: product cancellation | 2: CPU 412-2, CPU 417-4 |
| 1 April 2016 | PM400: phase-out announced | 2: CPU 412-2, CPU 417-4 |
| 1 October 2012 | PM400: phase-out announced | 2: CPU 412-3H, CPU 414-4H |
Source: the SiePortal record of each order number, checked 15 October 2026.
S7-400 order numbers and their status
Every status and date below is from Siemens’ record for that order number. Siemens can change a status, so the Source link in each row is the reference.
CPUs (8)
Fail-safe CPUs (1)
Digital I/O (10)
Analogue I/O (8)
Function modules (5)
How to use this list
A status in this list tells you what Siemens says about an order number. It does not confirm that a unit is in stock, where it is or what condition it is in.
- Read the full order number off the installed module, including the final block (for example -0AB0).
- Find it in the tables above and note its status and date.
- Open the Source link and check the Siemens record has not changed since our last check.
- Discontinued and needed to keep running: rank it by what happens when it fails, and confirm supply for the ones that matter.
Before you ask for a quote
Two modules with the same name can differ in order number suffix, product version and firmware. Send us all three and we confirm the match before we quote.
Frequently asked questions
Which S7-400 parts are discontinued?
On this list, every signal and function module and every CPU except four. Siemens cancelled the SM 421, SM 422, SM 431 and SM 432 modules and the FM 450-1, FM 451, FM 452 and FM 455 on 1 October 2026. The 414-3, 416-2, 416-3 and 416F-3 PN/DP CPUs are still sold, with their phase-out announced on the same day.
Is the S7-400 discontinued?
Most of it. Siemens has cancelled or discontinued most S7-400 order numbers on this list, and on 1 October 2026 it announced the phase-out of the four CPUs it was still selling as active products. Each order number has its own date, given in the list.
Does Siemens name a successor for these order numbers?
SiePortal names no successor on the records in this list.
How often is this list checked?
Each order number is checked against Siemens' own record. The date is shown in every row and in the CSV.
Can I use the CSV?
Yes. It has the same columns as the list, including the Siemens source for each order number. Check that source before you rely on a status.
Sources. Siemens SiePortal product records for each order number, checked 15 October 2026. Statuses can change; the Siemens record is the reference. For the S7-300 and ET 200M: S7-300 part status list.
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