ABB MRP31.0 - Page 12

Modbus interface diagnosis
Diagnosis information is locally displayed using LEDs located on the front side of the Modbus interface.
LED Bus (red, green) LED DD (red, green) Meaning
  Power Supply missing
Green flashing 

master

Red flashing Parameter mismatch between device and master
Red 
Green 
Amber flashing Amber flashing 
Green flashing Waiting for communication from UMC
Green 
Red flashing Connection to UMC lost
Red Internal fault. Replace communication interface.
Modbus exception codes
Code Name Meaning
  The function code received in the request is not an allowable action for the slave. It could also indicate

configured
 ILLEGAL DATA ADDRESS The data address received in the request is not an allowable address for the slave.
  A value contained in the request data field is not an allowable value for slave. This indicates a fault in

  An unrecoverable error occurred while the slave was attempting to perform the requested action.





12 UNIVERSAL MOTOR CONTROLLER UMC100.3 | MRP31.0 MODBUS TCP COMMUNICATION MODULE MANUAL