Connecting I/O cards between two PLCs

K

Thread Starter

Kapil

I have two separate PLC. Both are having the I/O cards of 230 VAC. I have to give one signal from one PLC to other. I have taken a Digital output from PLC and given to Digital input card of other PLC. Please suggest what wiring I have to do? How the phase and neutral wiring will be done? Can I use the phase of first PLC card and the neutral of other PLC Card or I have to take the Phase and neutral of first PLC only?
 
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Dinesh Chauhan

You Should use 230 VAC relay instead...
DO of 2nd PLC will operate a relay whose contacts are acting as a DI of the 1st PLC and visa versa...
 
R
In theory the neutrals should be at the same potential, especially if both PLCs get their supply from the same transformer or they share the same common grounding point.

I would run a cable from the outputs across to the inputs of the other, include a neutral but don't connect it that way if you need to add interposing relays or transformers you are prepared.
 
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