
Digital modules
4.9 Digital input module SM 421; DI 16 x AC 120 V (6ES7421-5EH00-0AA0)
S7-400 Automation System Module Data
120 Reference Manual, Edition 09/2009, A5E00850736-06
4.9 Digital input module SM 421; DI 16 x AC 120 V (6ES7421-5EH00-
0AA0)
Features
The SM 421; DI 16 x AC 120 V has the following features:
● 16 inputs, isolated
● Nominal input voltage 120 VAC
● Suitable for switches and 2-wire proximity switches (BEROs, IEC 61131; type 2)
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