Siemens S7-400PLC Spécifications Page 110

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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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