Siemens SITRANS P Operating Instructions Manual page 195

ID Symbols Message
bS Event counter 2
Number underruns above
threshold
Maintenance alarm
CA Simulation mode
Cb Diagnostics simulated
Simulation mode
Co Loop current fixed
Manual operation
CP Loop current in saturation
Process value warning
CU PV status: uncertain
Process value alarm
CY PV status: bad
Maintenance alarm
Fb Supply voltage below limit.
Maintenance demanded
FC Supply voltage above limit
Maintenance alarm
SITRANS P320/P420 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E44852162-AC
Cause/Remedy
The number of underruns of the process value (set in parameters
"Lower limit" and "Monitored value") has reached the threshold.
Reset and acknowledge event counter.
Check process conditions.
Check limit monitoring and event counter settings.
The device is in simulation mode and one or more of its device vari‐
ables are not representative of the process.
Disable the simulation to return to normal operation.
The device is in simulation mode.
Disable the simulation to return to normal operation.
The loop current is being held at a fixed value and is not responding
to process variations.
Enter the loop current output value for simulation.
Disable the simulation to return to normal operation.
The loop current has reached its upper (or lower) saturation limit and
cannot increase (or decrease) any further.
Adjust loop current scaling.
The value is outside of the physical sensor range. Accuracy may
decrease.
Check for changes in process conditions or obstructions in vessel.
The measured value is 10% higher than the physical sensor range.
Review process conditions versus product specifications.
Use a device that fulfills your process conditions.
The supply voltage is too low.
Make sure input voltage is within product specification.
The supply voltage is too high.
Make sure input voltage is within product specification.
Diagnostics and troubleshooting
12.2 Diagnostic messages
195