Multiple grounding points can cause DCS failures: if your facility has a modern distributed control system with a reading 'offset' problem, the grounding system could be the cause... and the remedy

摘要

One of the really great things about modern distributed control systems (DCSs) is once they're set up and operational, readings are steady and repeatable. In fact, they're so reliable that common programming relies on the DCS to serve as the watchdog over many processes with full authority to "trip" when values stray outside of predefined "windows" or maximum and minimum values. This is a valuable feature until the DCS trips the system due to a faulty value or, even worse, it trips at random times that are seemingly unrelated.