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MRP31.0 Technical description
Issue: 09.2014
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
Off
Off
Power Supply missing
Green fl ashing
- Connection to master missing
- Bus address of UMC different form the one confi gured in the master
- I/O size mismatch between device and master
Red fl ashing
Parameter mismatch between device and master
Red
Communication lost, supervision timeout time exceeded
Green
OK, normal data exchange
Amber fl ashing
Amber fl ashing
Initializing
Green fl ashing
Waiting for communication from UMC
Green
OK, normal data exchange
Red fl ashing
Connection to UMC lost
Red
Internal fault. Replace communication interface.
Modbus exception codes
Code
Name
Meaning
01
ILLEGAL FUNCTION
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 confi
gured
02
ILLEGAL DATA ADDRESS
The data address received in the request is not an allowable address for the slave.
03
ILLEGAL DATA VALUE
A value contained in the request data fi eld 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.
04
SLAVE DEVICE FAILURE
An unrecoverable error occurred while the slave was attempting to perform the requested action.
- Wrong confi guration
- Not supported baud rate
- Serial device connected, but parallel device addressed
- Parallel device connected, but serial device addressed
- Connected serial device defective
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