Siemens Simatic S7-400 User Manual Page 178

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Digital Modules
4-56
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
4.15 Digital Input Module SM 421; DI 32 120 VUC;
(6ES7421-1EL00-0AA0)
Characteristics
The SM 421; DI 32 120 VUC is characterized by the following features:
32 inputs, isolated
Rated input voltage 120 VAC/VDC
Suitable for switches and two-wire proximity switches
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