PlantPAx issue faulting I/O not visible on faceplate

[bwhinch 1]

I'm new to PlantPAx, and trying to make sense of some new equipment at my plant.

There is a P_AOut AOI that will stop passing an input PSet_CV through it to Out_CV (to a 4/20mA Fisher Valve). There is no indication on the HMI of a fault. I've found toggling OCmd_Reset clears the fault and the valve resumes controlling again for a short while. In the P_AOut AOI I noticed the fault shows up under Val_Fault as 32 indicating a I/O Fault.

If I trace PSet_CV back to the previous function block diagram, it's from a flow control P_PIDE AOI. That seems to be where the faceplate is linked to. It seems to be a cascade setup. The flow control PID sends the setpoint to the analog output AOI. I just don't understand how the faceplate is linked...

 

Edited 6 Feb 2020 by bwhinch

[Michael Lloyd 85]

1st - I'm not a PlantPax person.

BAD 32 = Signal failure (out-of-range, NaN, invalid combination)

 

Found on Page 14 Here: https://literature.rockwellautomation.com/idc/groups/literature/documents/rm/syslib-rm042_-en-p.pdf

SrcQ - I/O Signal Source Quality

 

Page 18 has a programming example. Page 19 says that you should have a bad quality indicator if the error code is 32