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asteroidehk

Communication PLC5 to SLC500?

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Hello Friends

I need to share some bits between a PLC 5/30 and a 5/04 CPU through DH+. 

Is it possible? How can I do that? With MSG instruction?

 

Thanks a lot.

 

 

 

 

 

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I've seen it done (and done it myself a VERY long time ago) via MSG instructions between a bunch of SLC 5/04s over DH+.  I expect the PLC 5 will work similarly. 

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I did something similar with MSG instructions between two PLC 5's. It's a good idea to write some logic to check the "heartbeat"/healthy communications between your PLC's so you know if something is wrong with one of them.

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Another thing to make life easier for folks troubleshooting later: if possible, use only "Read" MSG instructions.  That way the bits that are changing state can be traced with the cross-reference tool very easily.  If you use a write instruction, the receiving PLC will only show the bits being used in read instructions with nothing to indicate what's causing them to change state.  If you must use a write MSG for whatever reason, be sure to document what's going on VERY clearly in the receiving PLC.

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