Siemens Simatic S7-400 User Manual
Page 172
Digital Modules
4-50
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
4.13
Digital Input Module SM 421; DI 16
120/230 VUC;
(6ES7 421-1FH00-0AA0)
Characteristics
The SM 421; DI 16
120/230 VUC is characterized by the following features:
•
16 inputs, isolated
•
Rated input voltage 120/230 VAC/VDC
•
Suitable for switches and two-wire proximity switches
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