Siemens M7-400 Benutzerhandbuch

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S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

 

The digital input module SM 421; DI  16 

 

 24 VDC has the following features:

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16 inputs, isolated in 2 groups of 8

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24 VDC rated input voltage

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Suitable for switches and two/three/four-wire proximity switches 
(BEROs, IEC 61131; type 2)

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2 short-circuit-proof sensor supplies for 8 channels each

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External redundant power supply possible to supply sensors

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“Sensor supply (Vs) O.K.” status display

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Group error display for internal faults (INTF) and external faults (EXTF)

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Programmable diagnostics

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Programmable diagnostic interrupt

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Programmable hardware interrupt

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Programmable input delays

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Parameterizable substitute values in the input range

The status LEDs indicate the process status.