Siemens Simatic S7-400

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
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
Reference Manual, Ausgabe 11/2016, A5E00850736-08 119