
Digital modules
4.8 Digital input module SM 421; DI 16 x DC 24 V (6ES7421-7BH01-0AB0)
S7-400 Automation System Module Data
110 Reference Manual, Edition 09/2009, A5E00850736-06
4.8 Digital input module SM 421; DI 16 x DC 24 V (6ES7421-7BH01-
0AB0)
4.8.1 Features
Overview
The digital input module SM 421; DI 16 x DC 24 V has the following features:
● 16 inputs, isolated in 2 groups of 8
● Extremely fast signal processing: Input filter starting at 50 µs
● Nominal input voltage 24 VDC
● Suitable for switches and 2/3/4-wire proximity switches (BEROs, IEC 61131; type 2)
● 2 short-circuit-proof sensor supplies for each group of 8 channels
● External redundant sensor supply is supported
● "Sensor supply (Vs) O.K." status display
● Group error display for internal faults (INTF) and external faults (EXTF)
● Programmable diagnostics
● Programmable diagnostic interrupt
● Programmable hardware interrupts
● Programmable input delays
● Programmable substitute values in the input range
The status LEDs indicate the process status
Note
The spare parts of this module are compatible with SM 421; DI 16 x DC 24 V; (6ES7421-
7BH00-0AB0).
To be able to use the new function "input delay 50 µs", you require STEP 7 as of V 5.2.
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