The attached image shows 4 different ways of drawing a pressure transmitter input to a PLC as it might be shown on a P&ID. My question is which of these is correct or preferred? Or is there another, better way?
The only way I have ever seen this done is some variation of method #2. I don't feel that it should be correct to have the actual I/O channel information on a P&ID though, in my opinion that information belongs only on an electrical diagram.
I can't find many good examples of P&IDs on the internet, and none of the ISA documents I have looked at are very clear about how this should be done either. Anyone have an opinion on this?
The only way I have ever seen this done is some variation of method #2. I don't feel that it should be correct to have the actual I/O channel information on a P&ID though, in my opinion that information belongs only on an electrical diagram.
I can't find many good examples of P&IDs on the internet, and none of the ISA documents I have looked at are very clear about how this should be done either. Anyone have an opinion on this?