DCS Exi AO card to PLC Non-Ex AI card

J

Thread Starter

Jason Cha

I am Instrument engineer , and have question about card combination…

For my project, there is one case that DCS Ex-I AO card ( ABB Barrier-inbuilt card) : AO signal is connected to Siemens PLC ‘ Non-Ex I ‘ AI card…
- Loop powered from ABB Ex I card
- Direct one pair cable is supposed to be connected.
- Both DCS and PLC are located into Safe area ( rack room).

In this case, between two cards, any barrier( isolator ) is required or just direct connection is acceptable ? if another barrier is needed , could you please advise any technical reason ?
 
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