Siemens Simatic S7-400

4.12 Digital input module SM 421; DI 16 x UC 120/230 V
(6ES7421-1FH20-0AA0)
Properties
SM 421; DI 16 x UC 120/230 V has the following features:
● 16 inputs, isolated in groups of 4
● Rated input voltage UC 120/230 V
● Input characteristic in accordance with IEC 61131-2; type 2
● Suitable for switches and 2-wire proximity switches (BEROs)
The status LEDs indicate the process status.
Digital modules
4.12 Digital input module SM 421; DI 16 x UC 120/230 V (6ES7421-1FH20-0AA0)
S7-400 Automation System Module Data
122 Reference Manual, Ausgabe 11/2016, A5E00850736-08