77
Table 5.1.14.1.-3 Diagnostic counters
Name Description
Bus message count The number of messages in the communications
system detected by the slave since its last pickup,
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 5.1.14.1.-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.
If an Illegal data value exception response is generated when
attempting to preset multiple registers, the contents of the register to
which an illegal value has been imposed and of the following registers
is not changed. Registers which have already been preset are not
restored.
Motor Protection Relay
Technical Reference Manual - ANSI Version
REM 610REM 610
1MRS755537
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