Siemens S7-400 Benutzerhandbuch

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

 

The SM 421;DI 32 x 24 VDC is a digital input module with the following features:

•

32 inputs, isolated in a group of 32. In other words, all inputs share the same
chassis ground.

•

Rated load voltage: 24 VDC

•

Suitable for switches and 2-wire proximity switches 
(BEROs, IEC 61131; type 2).

The status LEDs indicate the process status.

The lower limit of the rated input range is increased at signal “0” from –3 to –30 V.

The rated input voltage for signal “0” is thus: –30 V to 5 V