Under what conditions will the computer in the control room display “Nan” for the on-site instruments?
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In other words, what’s wrong with the field instruments? The central control computer will display it
It’s possible that the data exceeds the limits, either the upper or lower limit
I don’t know what system you’re on either. But generally, this happens when no data is received. The wire is broken, the card has burned out, the safety device has been damaged, and the gauge is ruined.
It could be an open circuit or a short circuit in the sensor, or it might be a fault with the transmitter~~ This will result in “NOT A NUMBER”~~
You’re using a Honeywell system, right! :lol:lol
The field transmitter is open-circuited or short-circuited; I encountered that once, with a loose connection on the wiring box side: lol