Out of three AI channels two channels are showing "Underflow" One Channel is in good Value in AI801
we are facing some issue with AI Signal in AI810 card, One channel(Temperature) is showing Helthy signal but other two channels (Temp & Pressure) are underflow.
When we feed the value directly from the filed we are getting the Good Value.
Instruments are calibrated with desired range and in the card settings also mentioned with 4-20mA and range.
I have attahced the wiring, please suggest your view to troubleshoot the problem.
Connection diagram shows 2-wire connection - you "take" +24VDC from the I/O module (L+), go to the transmitter and receive current to the input (1I, 2I etc).
Please measure the input current in input circuit first. It should in range 4-20mA. If it is under 4mA or with reverce poliarity or open circuit, the input module reports underflow.
The other possibility is the transmitter to be with 4-wire connection, which means it produces 4-20mA with own power supply. If that is the case, you need to connect + of the transmitter to 1I (or 2I or 3I etc) of the module and - of the transmitter to -24VDC (L- of the module)