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