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I/O point issue

2011-10-17View Original

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It is a skid equipped with a PLC, and in the control loop, the AO signal can be generated by the PLC. The issue is that the PLC has an automatic and manual switching function; so, can the AO signal be generated by the DCS? How to calculate I/O points? Seeking help
Reply #22011-10-17
Do you mean that AO is sent by DCS, and then received by the PLC? In that case, count it as an AO point. . . It seems that it can’t be directly controlled by the DCS AO; it’s not possible to bypass the internal PLC and control it directly. Ask the manufacturer whether direct DCS control is possible.

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Translated at 2026-07-25 11:43:36

Original: https://bbs.hcbbs.com/thread-917455-1-1.html

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