Key takeaways
- Status: not covered. None of the Siemens documents we used gives a current status for the S7-400.
- Siemens' S7-300/S7-400 to S7-1500 guide lists a recommended S7-1500 CPU against 16 S7-400 CPU order numbers (Table 7-2, p. 83); none of them is on our shelves now.
- For the other S7-400 order numbers we stock (12 right now) this page names no successor and gives no status: not covered.
- No status is shown for any single order number: everything here is family-level, from the Siemens documents listed at the end, each with its page.
- The stock columns are live: what we have on the shelf now, at the price you pay.
What this page covers, and what it doesn't. Everything below comes from the 2 Siemens sources listed at the end, read on October 17, 2026, each statement with its page. These are statements about the S7-400 family as a whole: we show no lifecycle status for any single order number. Where a Siemens table lists an exact order number, we show what that table maps it to, with the table and page; that is Siemens' suggestion for a migration, for reference only, not a status and not a drop-in swap. Every other order number is marked “not covered”: we don't name a successor of our own.
Is the SIMATIC S7-400 still made?
Not covered.
Siemens' migration path
- Siemens' guide lists a recommended S7-1500 CPU for the CPUs in its appendix tables and calls them a rough guide: reserves of the old CPU, memory, interfaces and plant layout decide the choice. (Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 18)
- Siemens marks its comparison tables as for reference only: a listed S7-1500 module is not automatically an equivalent, so check supply, signal voltage, channels and load against your plant. (Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 81)
- In its tunnel automation example, Siemens' guide 109983811 moves an S7-400H system to an S7-1500H or S7-1500R on PROFINET, with ET 200SP or ET 200MP (or ET 200SP HA) in place of ET 200M. (Siemens migration guide 109983811, p. 6)
- The same guide names the CPU 410-5H as an interim step that keeps STEP 7 V5.x, notes that it is a process-automation controller whose use with STEP 7 V5.x needs special approval, and describes the change to an S7-1500H as the later, final step. (Siemens migration guide 109983811, p. 14)
- The existing ET 200 I/O can stay connected at first, but Siemens recommends moving all I/O to ET 200MP or ET 200SP (or other current ET 200) on PROFINET, if need be as a second step. (Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 21)
- For the program, the conversion tools are part of STEP 7 (TIA Portal), with a stand-alone migration tool and a readiness check. (Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 16)
S7-400 CPUs: Siemens' recommended S7-1500 CPU
Siemens' S7-300/S7-400 to S7-1500 migration guide (V1.1, May 2017) lists a recommended S7-1500 CPU against each of these S7-400 CPU order numbers, exactly as printed in its Table 7-2. Siemens calls the table a rough guide, for reference only (Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 18; Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 81). For the rows marked *) the guide asks you to read its CPU selection notes, especially on memory sizes.
| Order number | Type (as printed) | Siemens' recommended S7-1500 CPU | Source | In our stock |
|---|---|---|---|---|
6ES7 412-1XJ05-0AB0 | CPU 412-1MPI/DP | 6ES7 513-1AL01-0AB0 CPU 1513-1PN |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 412-2XJ05-0AB0 | CPU 412-2 | 6ES7 515-2AM01-0AB0 CPU 1515-2PN |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 412-2EK06-0AB0 | CPU 414-2PN/DP | 6ES7 516-3AN01-0AB0 CPU 1516-3PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 414-2XK05-0AB0 | CPU 414-2 | 6ES7 517-3AP00-0AB0 CPU 1517-3PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 414-3XM05-0AB0 | CPU 414-3 | 6ES7 517-3AP00-0AB0 CPU 1517-3PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 414-3EM05-0AB0 | CPU 414-3PN/DP | 6ES7 518-4AP00-0AB0 CPU 1518-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 414-3EM06-0AB0 | CPU 414-3PN/DP | 6ES7 518-4AP00-0AB0 CPU 1518-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 414-3FM06-0AB0 | CPU 414F-3PN/DP | 6ES7 518-4FP00-0AB0 CPU 1518F-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 416-2XN05-0AB0 | CPU 416-2 *) | 6ES7 518-4AP00-0AB0 CPU 1518-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 416-3XR05-0AB0 | CPU 416-3 *) | 6ES7 518-4AP00-0AB0 CPU 1518-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 416-3ER05-0AB0 | CPU 416-3PN/DP *) | 6ES7 518-4AP00-0AB0 CPU 1518-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 416-3ES06-0AB0 | CPU 416-3PN/DP *) | 6ES7 518-4AP00-0AB0 CPU 1518-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 416-2FN05-0AB0 | CPU 416F-2DP *) | 6ES7 518-4FP00-0AB0 CPU 1518F-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 416-3FR05-0AB0 | CPU 416F-3PN/DP *) | 6ES7 518-4FP00-0AB0 CPU 1518F-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 416-3FS06-0AB0 | CPU 416F-3PN/DP *) | 6ES7 518-4FP00-0AB0 CPU 1518F-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
6ES7 417-4XT05-0AB0 | CPU 417-4 *) | 6ES7 518-4AP00-0AB0 CPU 1518-4PN/DP |
Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83 | Request a quotenone listed now |
Other S7-400 order numbers in our stock
Not covered. For these we show no status and name no successor: this page lists S7-1500 counterparts only for the CPUs in Siemens' Table 7-2. Siemens' guide also has comparison tables for S7-400 signal, communication and technology modules (pp. 90, 92, 93 and 95), which it marks as for reference only; we have not put them on this page.
| Order number | Product (our listing) | Successor | In our stock |
|---|---|---|---|
6ES7 421-1BL01-0AA0 | Siemens 6ES7421-1BL01-0AA0 Simatic S7-400 SM 421 Digital Input Module 32 DI 24V | Not covered | 20 in stockfrom $17.89 |
6ES7 422-1BL00-0AA0 | Siemens 6ES7422-1BL00-0AA0 Simatic S7-400 SM 422 Digital Output Module 32 DO 24V | Not covered | 5 in stockfrom $24.89 |
6ES7 422-7BL00-0AB0 | Siemens 6ES7422-7BL00-0AB0 Simatic S7-400 Digital Output Module PLC Automation | Not covered | 9 in stockfrom $175.89 |
6ES7 441-2AA04-0AE0 | Siemens 6ES7441-2AA04-0AE0 Simatic S7-400 CP 441-2 Communication Module PLC | Not covered | 12 in stockfrom $269.89 |
6ES7 451-3AL00-0AE0 | Siemens 6ES7451-3AL00-0AE0 Simatic S7-400 FM 451 Counting Module PLC Industrial | Not covered | 1 in stockfrom $728.89 |
6ES7 453-3AH00-0AE0 | Siemens 6ES7453-3AH00-0AE0 Simatic S7-400 Servo Positioning Module PLC Control | Not covered | 4 in stockfrom $396.89 |
6ES7 460-0AA01-0AB0 | Siemens 6ES7460-0AA01-0AB0 Simatic S7-400 IM 460 Interface Connection Module PLC | Not covered | 2 in stockfrom $84.89 |
6ES7 461-0AA00-7AA0 | Siemens Simatic S7-400 6ES7461-0AA00-7AA0 Terminator Plug for IM 461-0 Module | Not covered | 1 in stockfrom $50.89 |
6ES7 461-0AA01-0AA0 | Siemens 6ES7461-0AA01-0AA0 Simatic S7-400 IM 461-0 Receiver Interface Module PLC | Not covered | 3 in stockfrom $90.89 |
6ES7 467-5GJ02-0AB0 | Siemens 6ES7467-5GJ02-0AB0 Simatic S7-400 IM 467 Profibus-DP Interface Module | Not covered | 1 in stockfrom $127.89 |
6ES7 468-1BB50-0AA0 | Siemens 6ES7468-1BB50-0AA0 Simatic S7-400 IM 460 461 K-Bus Cable 1.5m Industrial | Not covered | 4 in stockfrom $76.89 |
6ES7 492-1AL00-0AA0 | Siemens 6ES7492-1AL00-0AA0 SIMATIC S7-400 Front Connector Screw Terminal Block | Not covered | 13 in stockfrom $14.89 |
Sources (read October 17, 2026; page numbers are the ones printed on each page):
- Guide for Migrating SIMATIC S7-300/S7-400 to SIMATIC S7-1500 and TIA Portal – Siemens, V1.1, May 2017 (PDF, 97 pages)
- Migration Guide for Tunnel Automation from SIMATIC S7-400H with PROFIBUS to S7-1500H with PROFINET – Siemens, V1.2, January 2026 (PDF, 28 pages)
Siemens updates its documents: check the current edition, and the details of your plant, before you order or plan a migration.
Keep it running or migrate?
Many plants do both: spares for the S7-400 systems that must keep running, and a dated plan to move off the platform at planned shutdowns. Every unit we stock is photographed; check the order number and product version on the label before you buy.
Safety first: switch off and lock out the rack's supply and any separately powered I/O before you change a SIMATIC module, following Siemens' instructions and your site's lockout/tagout procedure. Field wiring can be live from other sources even when the PLC is off – verify before you touch it.
Frequently asked questions
Is the SIMATIC S7-400 still made?
Not covered: none of the Siemens documents we used gives a current S7-400 status, so this page shows none.
What replaces an S7-400 CPU?
Siemens' guide 109478811 lists a recommended S7-1500 CPU for the S7-400 CPUs in its Table 7-2 – for example 6ES7 517-3AP00-0AB0 (CPU 1517-3PN/DP) against the 6ES7 414-3XM05-0AB0 (CPU 414-3) (Table 7-2, Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 83). For the CPU 416 and 417 rows it asks you to read its CPU selection notes, especially on memory sizes. Siemens' guide lists a recommended S7-1500 CPU for the CPUs in its appendix tables and calls them a rough guide: reserves of the old CPU, memory, interfaces and plant layout decide the choice. (Siemens S7-300/S7-400 to S7-1500 migration guide 109478811, p. 18)
What replaces an S7-400H system?
In its tunnel automation example, Siemens' guide 109983811 moves an S7-400H system to an S7-1500H or S7-1500R on PROFINET, with ET 200SP or ET 200MP (or ET 200SP HA) in place of ET 200M. (Siemens migration guide 109983811, p. 6) The same guide names the CPU 410-5H as an interim step that keeps STEP 7 V5.x, notes that it is a process-automation controller whose use with STEP 7 V5.x needs special approval, and describes the change to an S7-1500H as the later, final step. (Siemens migration guide 109983811, p. 14)
Can I still buy SIMATIC S7-400 parts?
We stock surplus and used units – the tables show what is on our shelves now – and source the ones we don't have: send the order numbers through the quote form. Purchase orders are welcome; payment is due before we ship.