SIMATIC S7-1200 SM 1221 Digital Input Module is a signal module with 8 DI or 16 DI, 24 V DC sink/source inputs. It supplements the integral I/O of the CPU and allows the controller to be expanded later with additional inputs; SIPLUS versions are available for extreme environmental conditions.
Technical data
| Product | SM 1221 |
|---|---|
| Product family | SIMATIC S7-1200 |
| Description | 24 V DC digital input expansion modules |
| Example version | SM 1221 digital input signal module SIMATIC S7-1200, SM 1221 digital input module 8 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, SM 1221 digital input module 8 DI, 24 V DC, sink/source | 6ES7221-1BF32-0XB0 |
| Standard | SIMATIC S7-1200, SM 1221 digital input module 16 DI, 24 V DC, sink/source | 6ES7221-1BH32-0XB0 |
| SIPLUS | SIPLUS SM 1221 digital input signal module (Extended temperature range and exposure to environmental substances) 8 inputs, 24 V DC, isolated, sinking/sourcing output • For areas with exceptional exposure to environmental substances (conformal coating) | 6AG1221-1BF32-4XB0 |
| SIPLUS | • -25 ... +70 °C, from +60 … +70 °C number of simultaneously controllable inputs and outputs max. 50 % | 6AG1221-1BF32-2XB0 |
| SIPLUS | 16 inputs, 24 V DC, isolated, sinking/sourcing output • For areas with exceptional exposure to environmental substances (conformal coating) | 6AG1221-1BH32-4XB0 |
| SIPLUS | • -25 ... +70 °C, from +60 … +70 °C number of simultaneously controllable inputs and outputs max. 50% | 6AG1221-1BH32-2XB0 |
Technical data and article numbers are based on Siemens catalog ST 70 · 2026 (chapter SIMATIC S7-1200) and are for information only. Image is representative.
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Tags: SM 1221, siemens s7-1200, simatic plc, sm 1221, 6ES7221-1BF32-0XB0, 6ES7221-1BH32-0XB0, 6AG1221-1BF32-4XB0, 6AG1221-1BF32-2XB0, 6AG1221-1BH32-4XB0, 6AG1221-1BH32-2XB0