Siemens Simatic S7-400 User Manual
Page 163
Digital Modules
4-41
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
4.11
Digital Input Module SM 421; DI 16
120 VAC
;
(6ES7421-5EH00-0AA0)
Characteristics
The SM 421; DI 16
120 VAC has the following features:
•
16 inputs, isolated
•
120 VAC rated input voltage
•
Suitable for switches and two-wire proximity switches
(BEROs, IEC 61131; type 2)
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