ABB COMMANDER 500 - Loopback Test - Function Code 08

14
…5 MODBUS FUNCTIONS
5.5 Loopback Test – Function Code 08
5.5.1 Loopback Test Query
The Loopback Test Query tests the MODBUS system and does not affect the operation of the slave.
Variations in the response may indicate faults in the MODBUS system. The information field contains
two bytes for the designation of the diagnostic code followed by two bytes to designate the action to
be taken.
Example
5.5.2 Loopback Test Response
The Loopback Test Response always echoes the query, only diagnostic code 0 (bytes 3 and 4) can
be used.
Example
sserddAnoitcnuF
edoCcitsongaiDataD
*ataD*ataD
dleiFkcehCrorrE
)61CRC(
hgiHwoL
108000005A73ADD8
sserddAnoitcnuF
edoCcitsongaiDataD
*ataD*ataD
dleiFkcehCrorrE
)61CRC(
hgiHwoL
108000005A73ADD8