The G2 signal-module range in one paragraph
The SIMATIC S7-1200 G2 generation is Siemens' successor to the current (G1) S7-1200 system, with the discontinuation announcement milestone for G1 set at 1 November 2026 and new G1 parts expected until 1 October 2027 (spare parts to 2036). For signal modules, the practical change buyers notice first is the order-number scheme: the official migration overview lists G2 successors under new numbers in the -5xx50 pattern — for example the SM 1223 16 DI / 16 DO moves from 6ES7223-1BL32-0XB0 to 6ES7223-5BL50-0XB0 — and the G2 range centres on 16-channel versions.
G1 to G2 order-number cross-reference
The official migration table lists these recommended successors:
- SM 1221 16 DI: 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 relay: 6ES7223-1PH32-0XB0 → 6ES7223-5PH50-0XB0
- SM 1223 8 DI / 8 DO 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
The 8-channel G1 references (SM 1221 8 DI, SM 1222 8 DO changeover, SM 1222 8 DO DC) have no direct successor listed in the official table — the replacement path for those designs should be confirmed per project before ordering.
What changes beyond the order number
Three practical differences matter when planning a G2 panel. First, wiring: the migration overview documents narrower permitted wire cross-sections and ferrule sizes on the G2 terminal blocks, so existing harnesses need checking before reuse. Second, channel organisation: the G2 signal range centres on 16-channel modules, which changes cabinet space calculations compared with 8-channel G1 designs. Third, lifecycle: all future innovations take place in the G2 system per Siemens, so new projects should weigh G2 first while G1 stock remains the maintenance path for existing installations until 2027.
Should you buy G1 stock or order G2 now?
It depends on the project: maintaining an existing G1 station through its remaining life favours G1 stock (new parts until 1 October 2027, then spare parts — or third-party compatible modules, which we stock for the common SM 1221/1222/1223 references); a new build or a major retrofit is the natural point to move to G2 and its -5xx50 order numbers. Both paths can be quoted side by side — original G1 remaining stock, G2 successors and compatible replacements are separate lines, never mixed in one quotation.
What JWDrive can supply
Original Siemens G1 components are available on request while supply lasts, G2 successors are quoted on request as they enter our sourcing channels, and third-party compatible modules for the G1 SM 1221/1222/1223 references are listed in the shop with fixed USDC/USDT prices, 2-business-day dispatch and a 12-month warranty. For the G1 side of this transition, see our G1-to-G2 migration timeline and cross-reference and the compatible SM 1221/1222/1223 buying guide.
Frequently Asked Questions
What does the -5xx50 pattern in G2 order numbers mean?
It is the order-number pattern the official migration table uses for the G2 signal-module successors (for example 6ES7223-5BL50-0XB0 as the successor to 6ES7223-1BL32-0XB0). The G2 CPU references follow their own scheme; match each module individually against the official table rather than assuming a family-wide rule.
Can I keep using my G1 I/O with a G2 CPU?
The generations are separate systems, and the official documentation provides the migration path between them — module-by-module successor mapping and wiring differences included. Confirm the specific modules in your station against the migration overview, and check harness compatibility before reuse, since permitted wire sizes differ.
How long will compatible modules remain an option for G1 stations?
Third-party compatible modules for the G1 SM 1221/1222/1223 references are a stock-dependent supply path; spare-part supply of original G1 parts is announced until 2036, which keeps the installed base serviceable long after new-part sales end in 2027. Confirm current availability per reference at order time.
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