Siemens SIMATIC S7-1200 SM 1221 digital input modules (8/16 DI)

Digital input signal modules for expanding the integrated inputs of SIMATIC S7-1200 CPUs.

Key features

8 or 16 digital inputs 24 V DC
Sink/source inputs
Plug-in terminal blocks
Mounts to the right of the CPU

Specifications

Brand	Siemens
Product line	SIMATIC
Series	SIMATIC S7-1200
Module	SM 1221
Input voltage	24 V DC
Input type	Sink/source
Width	45 mm
Engineering	STEP 7 (TIA Portal)
Source	Siemens Catalog ST 70 · 2026, p. 172-174

6ES7221-1BF32-0XB0		Channels: 8 DI
6ES7221-1BH32-0XB0		Channels: 16 DI

PLC I/O ModulesSiemens

2 product codes available in this family

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Siemens SIMATIC S7-1200 SM 1221 digital input modules (8/16 DI)

Brand Siemens·PLC I/O Modules

Available part numbers (2)

6ES7221-1BF32-0XB0, 6ES7221-1BH32-0XB0

How to order

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