Siemens
Siemens 6ES7221-1BH32-0XB0 SM 1221 16 DI 24 V DC
Siemens 6ES7221-1BH32-0XB0 is a SIMATIC S7-1200 digital input module for adding 16 digital inputs to an S7-1200 controller without changing the CPU platform.
Broader comparison
The broader comparison is usually not between random module numbers, but between staying inside the S7-1200 expansion path and moving the application toward a different I/O architecture. Choose the family that matches the long-term signal map, not just today's spare slot.
Specifications
Product family
SM 1221 digital input modules
Exact model
6ES7221-1BH32-0XB0
Controller platform
Siemens SIMATIC S7-1200
Module type
digital input module
Channel count
16 digital inputs
Signal / electrical type
24 V DC, sink/source
Siemens lifecycle status
PM300 Active Product
PLM effective date
Product phase-out listed for 2026-11-01
Net weight
0.190 kg
Package size
9.00 x 10.90 x 6.00 cm
Engineering check
Match TIA Portal hardware catalog entry and terminal wiring before replacement
Manuals & Datasheets
Compatibility
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Accessories
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Replacement / Alternatives
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