ABB REU 610 Technical Reference Manual page 64

REU 610
64
Voltage Relay
Technical Reference Manual - ANSI Version
The Modbus protocol provides the following diagnostic counters:
Table 5.1.15.2.-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 following exception codes may be generated by the Modbus protocol:
Table 5.1.15.2.-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 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.
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.
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.
1MRS755972