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U N I V E R S A L M OTO R C O N T R O L L E R U M C 1 0 0 . 3 | M R P 3 1 . 0 M O D B U S T C P C O M M U N I C AT I O N M O D U L E M A N U A L
Modbus interface diagnosis
Diagnosis information is locally displayed using LEDs located on the front side of the Modbus interface.
LED Bus (red, green)
Off
Green flashing
Red flashing
Red
Green
Amber flashing
Modbus exception codes
Code
Name
01
ILLEGAL FUNCTION
02
ILLEGAL DATA ADDRESS
03
ILLEGAL DATA VALUE
04
SLAVE DEVICE FAILURE
LED DD (red, green)
Off
Amber flashing
Green flashing
Green
Red flashing
Red
Meaning
The function code received in the request is not an allowable action for the slave. It could also indicate
that the slave is in the wrong state to process a request of this type, for example because it is not
configured
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
the structure of the remainder of a complex request, such as that the implied length is incorrect.
An unrecoverable error occurred while the slave was attempting to perform the requested action.
- Wrong configuration
- Not supported baud rate
- Serial device connected, but parallel device addressed
- Parallel device connected, but serial device addressed
- Connected serial device defective
Meaning
Power Supply missing
- Connection to master missing
- Bus address of UMC different form the one configured in the
master
- I/O size mismatch between device and master
Parameter mismatch between device and master
Communication lost, supervision timeout time exceeded
OK, normal data exchange
Initializing
Waiting for communication from UMC
OK, normal data exchange
Connection to UMC lost
Internal fault. Replace communication interface.
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