Emerson Rosemount MCL-220 Reference Manual page 72

Troubleshoot
May 2019
9.3.3 Sensor Board Unknown, Sensor Board HW (Hardware) or
SW (Software) Mismatch, or Sensor Board Not
Communicating
These error messages mean the main board either does not recognize the sensor board or
the sensor board and main board are no longer communicating.
Procedure
1. Verify that the ribbon cable connecting the main board (on the inside of the front
2. Inspect the connecting cable for obvious tears or breaks.
3. If the ribbon cable is properly seated and appears undamaged, replace the sensor
9.3.4 Sensor Incompatible
This error message means that the sensor board software is not supported by the main
board software. Either the sensor board or the main board software is too old.
Replace the main board with one compatible with the sensor board. Call the factory for
assistance. You will be asked for the main and sensor board revision numbers. To read the
main board revision, press DIAG and scroll down until Inst SW Ver is showing. To view
the sensor board software revision, press DIAG, choose the appropriate sensor, and scroll
down until Board SW Ver is showing. The main board can be replaced only at the
factory.
9.3.5 Sensor CPU Error
This message means the sensor board software is corrupted.
Procedure
1. Cycle the power off and then on.
2. If cycling the power does not help, call the factory.
9.3.6 Sensor RTD Open
The a Pt 100 RTD (resistance temperature device) for measuring temperature. Sensor
RTD Open
Procedure
1. Confirm that the sensor RTD wires are properly connected.
2. Confirm that the Variopol connector is properly seated.
3. Disconnect the sensor from the cable and use an ohmmeter to check the resistance
72
panel) and the sensor board are properly seated.
board.
The sensor board must be replaced.
means the temperature measuring circuit is open.
across the RTD.
Reference Manual
00809-0100-3414
Emerson.com/Rosemount