
Digital modules
4.7 Digital input module SM 421; DI 32 x DC 24 V (6ES7421-1BL01-0AA0)
S7-400 Automation System Module Data
106 Reference Manual, Edition 09/2009, A5E00850736-06
4.7 Digital input module SM 421; DI 32 x DC 24 V (6ES7421-1BL01-0AA0)
Features
The digital input module SM 421; DI 32 x DC 24 V has the following features:
● 32 inputs, isolated in a group of 32
● Nominal input voltage 24 VDC
● Suitable for switches and 2/3/4-wire proximity switches (BEROs, IEC 61131; type 1)
The status LEDs indicate the process status
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