
Digital modules
4.11 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7 421-1FH00-0AA0)
S7-400 Automation System Module Data
130 Reference Manual, Edition 09/2009, A5E00850736-06
4.11 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7 421-
1FH00-0AA0)
Features
The SM 421; DI 16 x UC 120/230 is characterized by the following features:
● 16 inputs, isolated
● Nominal input voltage 120/230 VUC
● Suitable for switches and 2-wire proximity switches
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