
Digital modules
4.12 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7421-1FH20-0AA0)
S7-400 Automation System Module Data
134 Reference Manual, Edition 09/2009, A5E00850736-06
4.12 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7421-1FH20-
0AA0)
Features
The SM 421; DI 16 x UC 120/230 V is characterized by the following features:
● 16 inputs, isolated in groups of 4
● Nominal input voltage 120/230 VUC
● Input characteristic curve in accordance with IEC 61131-2; type 2
● Suitable for switches and 2-wire proximity switches (BEROs)
The status LEDs indicate the process status
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