When a field input to plc is coming from 400 to 600 meters
and the input is in 24 V DC? So signal cable of which cross
section i should select for proper signal to plc?

Answer Posted / mwah

yes gaurav kale is right about 0.5 sq.mm twisted pair
shielded cable but u have to install repeater to make sure
theres no degrading of the signal at the end.

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