SIMATIC S7-1200 G2 SM 1221 Digital Input Module is a 16-channel 24 V DC sink/source digital input module that supplements the CPU's integral inputs. It allows later expansion with additional inputs; a conformal-coated SIPLUS version for -40 to +70 °C is also available.
Technical data
| Product | SM 1221 |
|---|---|
| Product family | SIMATIC S7-1200 G2 (new generation) |
| Description | 24 V DC digital input expansion modules |
| Example version | SM 1221 digital input signal module SIMATIC S7-1200 G2: SM 1221 digital input module 16 DI Inputs: 16 x DI 24 V DC sink/source |
| Programming | STEP 7 (TIA Portal) |
Article numbers
| Version | Description | Article No. |
|---|---|---|
| Standard | SM 1221 digital input signal module SIMATIC S7-1200 G2: SM 1221 digital input module 16 DI Inputs: 16 x DI 24 V DC sink/source | 6ES7221-1BH50-0XB0 |
| SIPLUS | SIPLUS S7-1200 G2: SM1221 16DI With conformal coating -40...+70 °C. Inputs: 16x DI 24 V DC sink/source | 6AG1221-1BH50-7XB0 |
Technical data and article numbers are based on Siemens catalog ST 70 · 2026 (chapter SIMATIC S7-1200 G2) and are for information only. Image is representative.
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Tags: SM 1221, siemens s7-1200 g2, s7-1200, simatic plc, sm 1221, 6ES7221-1BH50-0XB0, 6AG1221-1BH50-7XB0