Siemens Simatic S7-400

4.10 Digital input module SM 421; DI 16 x UC 24/60 V
(6ES7421-7DH00-0AB0)
4.10.1 Features
Overview
SM 421; DI 16 x UC 24/60 V has the following features:
● 16 inputs, individually isolated
● Rated input voltage UC 24 V to UC 60 V
● Suitable for switches and 2-wire proximity switches (BEROs)
● Suitable as P-reading and M-reading input
● Group fault display for internal faults (INTF) and external faults (EXTF)
● Configurable diagnostics
● Configurable diagnostic interrupt
● Configurable hardware interrupts
● Configurable input delays
The status LEDs indicate the process status.
Digital modules
4.10 Digital input module SM 421; DI 16 x UC 24/60 V (6ES7421-7DH00-0AB0)
S7-400 Automation System Module Data
112 Reference Manual, Ausgabe 11/2016, A5E00850736-08