ABB REU 610 Technical Reference Manual page 62

REU 610
62
Voltage Relay
Technical Reference Manual
Table 5.1.15.1.-2 Supported diagnostic subfunctions (Continued)
Code Name
12 Return bus
communication error
count
13 Return bus
exception error
count
14 Return slave
message count
15 Return slave no
response count
16 Return slave NACK
response count
18 Return bus
character overrun
count
Sending other subfunction codes than those listed above cause an
Illegal data value response.
The Modbus protocol provides the following diagnostic counters:
Table 5.1.15.1.-3 Diagnostic counters
Name
Bus message count
Bus communication error count
Bus exception error count
Slave message count
Description
The number of CRC errors encountered by the slave
since its last restart, clear counters operation or power
up is returned in the response.
The number of Modbus exception responses sent by the
slave since its last restart, clear counters operation or
power up is returned in the response.
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 is returned
in the response.
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.
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