
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
124 Reference Manual, Edition 09/2009, A5E00850736-06
4.10 Digital input module SM 421; DI 16 x UC 24/60 V (6ES7421-7DH00-
0AB0)
4.10.1 Features
Overview
The SM 421; DI 16 x UC 24/60 V is characterized by the following features:
● 16 inputs, individually isolated
● Nominal input voltage 24 to 60 VUC
● Suitable for switches and 2-wire proximity switches (BEROs)
● Suitable as active high and active low input
● Group error display for internal faults (INTF) and external faults (EXTF)
● Programmable diagnostics
● Programmable diagnostic interrupt
● Programmable hardware interrupts
● Programmable input delays
The status LEDs indicate the process status
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