ABB REU 610, Техническое справочное руководство

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The Modbus protocol provides the following diagnostic counters:
Table 5.1.15.2.-3 Diagnostic counters
Name Description
Bus message count The number of messages in the communications
system detected by the slave since its last restart,
clear counters operation or power up.
Bus communication error count The number of CRC or LRC errors encountered
by the slave since its last restart, clear counters
operation or power up.
Bus exception error count The number of Modbus exception responses sent
by the slave since its last restart, clear counters
operation or power up.
Slave message count 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.
Slave no response count 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.
Slave NACK response count The number of messages addressed to the slave
for which a NACK response has been sent.
Bus character overrun count 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.
The following exception codes may be generated by the Modbus protocol:
Table 5.1.15.2.-4 Possible exception codes
Code Name Description
01 Illegal function The slave does not support the requested function.
02 Illegal data address The slave does not support the data address or the
number of items in the query is incorrect.
03 Illegal data value A value contained in the query data field is out of
range.
04 Slave device failure An unrecoverable error has occurred while the
slave was attempting to perform the requested
task.
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REU 610
Voltage Relay
Technical Reference Manual - ANSI Version
1MRS755972