ABB REF 610 Technical Reference Manual page 77

1MRS 755310 Feeder Protection Relay
Technical Reference Manual
Table 4.1.15.2-2 Supported diagnostic subfunctions
Code Name
15 Return slave no
response count
16 Return slave
NACK response
count
18 Return bus
character overrun
count
Note!
Sending other subfunction codes than those listed above will cause an "Illegal data
value" response.
The Modbus protocol provides the following diagnostic counters:
Table 4.1.15.2-3 Diagnostic counters
Name
Bus message count
Bus communication error
count
Bus exception error count
Slave message count
Slave no response count
Slave NACK response
count
Bus character overrun count The number of messages addressed to the slave for which it
The following exception codes may be generated by the Modbus protocol:
Table 4.1.15.2-4 Possible exception codes
Code Name
01 Illegal function
02 Illegal data
address
03 Illegal data value
04 Slave device
failure
Description
The number of messages addressed to the slave for which a
response (neither a normal response nor an exception
response) has not been sent since its last restart, clear
counters operation or power up is returned in the response.
The number of messages addressed to the slave for which a
NACK response has been sent is returned in the response.
The number of messages addressed to the slave for which it
has not been able to send a response due to a character
overrun since its last restart, clear counters operation or power
up is returned in the response.
Description
The number of messages in the communications system
detected by the slave since its last restart, clear counters
operation or power up.
The number of CRC or LRC errors encountered by the slave
since its last restart, clear counters operation or power up.
The number of Modbus exception responses sent by the slave
since its last restart, clear counters operation or power up.
The number of messages addressed to the slave or broadcast
which the slave has processed since its last restart, clear
counters operation or power up.
The number of messages addressed to the slave for which a
response (neither a normal response nor an exception
response) has not been sent since its last restart, clear
counters operation or power up.
The number of messages addressed to the slave for which a
NACK response has been sent.
has not been able to send a response due to a character
overrun since its last restart, clear counters operation or power
up.
Description
The slave does not support the requested function.
The slave does not support the data address or the number of
items in the query is incorrect.
A value contained in the query data field is out of range.
An unrecoverable error has occurred while the slave was
attempting to perform the requested task.
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