The S7-1200 G1 phase-out in one paragraph
Siemens' official migration documentation sets the discontinuation announcement milestone for the SIMATIC S7-1200 (G1) system at 1 November 2026. New parts are expected to remain available until 1 October 2027; after that, S7-1200 components will only be available as spare parts, with spare-part supply announced until 2036. The SIMATIC S7-1200 G2 generation is the successor system, and Siemens states that all future innovations will take place in the G2 system only. JWDrive supplies both original Siemens S7-1200 components (on request) and third-party compatible modules, so you can plan the transition either way.
Key dates at a glance
According to the official S7-1200 G2 migration overview: the discontinuation announcement (PM400 milestone) is scheduled for 1 November 2026; S7-1200 components are available as new parts until around 1 October 2027; afterwards they are available only as spare parts; spare-part availability is announced for ten years, until 2036. Siemens also notes that continued use of the current S7-1200 (G1) may limit compatibility with future technologies and evolving industry standards.
Signal module cross-reference: G1 order number to G2 successor
The official migration overview lists these recommended successors for the digital signal modules:
- SM 1221, 16 DI, 24 V DC: 6ES7221-1BH32-0XB0 → 6ES7221-1BH50-0XB0
- SM 1222, 16 DO, relays: 6ES7222-1HH32-0XB0 → 6ES7222-5HH50-0XB0
- SM 1222, 16 DO, 24 V DC: 6ES7222-1BH32-0XB0 → 6ES7222-5BH50-0XB0
- SM 1223, 8 DI / 8 DO, 24 V DC / relay: 6ES7223-1PH32-0XB0 → 6ES7223-5PH50-0XB0
- SM 1223, 8 DI / 8 DO, 24 V DC: 6ES7223-1BH32-0XB0 → 6ES7223-5BH50-0XB0
- SM 1223, 16 DI / 16 DO: 6ES7223-1BL32-0XB0 → 6ES7223-5BL50-0XB0
- SM 1223, 16 DI / 16 DO sink: 6ES7223-1BL32-1XB0 → 6ES7223-5BL50-1XB0
- SM 1223, 16 DI / 16 DO relay: 6ES7223-1PL32-0XB0 → 6ES7223-5PL50-0XB0
Which G1 modules have no direct successor listed
The official migration table does not list a direct G2 successor for the 8-channel versions: SM 1221 8 DI (6ES7221-1BF32-0XB0), SM 1222 8 DO changeover (6ES7222-1XF32-0XB0) and SM 1222 8 DO 24 V DC (6ES7222-1BF32-0XB0). The G2 signal-module range centres on 16-channel versions, so confirm the replacement path for 8-channel designs against the official documentation — or with us — before ordering; the 16-channel G2 successors may cover the application with channel capacity to spare, but that is a per-project decision.
Wiring and terminal differences between generations
The migration overview also shows that wiring specifications differ between the generations: permitted wire cross-sections and ferrule sizes for the signal modules' terminal blocks are narrower on the G2 generation. Before reusing existing harnesses in a G2 panel, check the terminal specifications in the official documentation — mechanical fit alone does not guarantee the same wiring practice.
What JWDrive can supply during the transition
Original Siemens S7-1200 (G1) components are available on request while new-part supply lasts (expected until 1 October 2027), and G2 successors can be quoted on request as well. For the SM 1221/1222/1223 references, third-party compatible modules are listed in the JWDrive online shop with fixed USDC/USDT prices, covering the common 8-channel and 16-channel variants. Every compatible listing states its third-party identity and the Siemens reference it matches; original and compatible supply paths are always quoted separately.
Frequently Asked Questions
How long can I keep buying current S7-1200 (G1) modules?
Per the official migration overview, the discontinuation announcement milestone is 1 November 2026, new parts are expected to remain available until 1 October 2027, and after that only as spare parts until 2036. Confirm per-article availability at order time, as stock varies.
Which G2 order number replaces my SM 1221/1222/1223?
The 16-channel versions have listed successors (for example SM 1223 16 DI / 16 DO, 6ES7223-1BL32-0XB0, moves to 6ES7223-5BL50-0XB0). The 8-channel G1 versions have no direct successor listed in the official table, so the replacement path should be confirmed before ordering.
Should I move to G2 now or keep using compatible replacements?
Siemens states that all future innovations will take place in the G2 system only, so new projects should weigh G2 first; existing G1 installations can be maintained with remaining G1 new parts, spare parts or third-party compatible modules. JWDrive quotes original and compatible paths separately so the decision stays with your project timeline.
Call-to-Action
Send your G1 order numbers or your G2 target list to amelia.flores@jwdspares.com or use the WhatsApp chat button — we will confirm availability, lead time and the original-versus-compatible options for each reference.
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