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9.4 Troubleshooting in bus connection
9.4.3 Specific example of troubleshooting
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9
ERROR CODES AND
ERROR MESSAGES
APPENDICESINDEX
9.4.3 Specific example of troubleshooting
An example of troubleshooting the system which is used when an error occurs on the PLC CPU is shown
below.
PLC
(extension base module)
Start
The SP. UNIT DOWN message appears on CPU.
Replace the faulty CPU with a new one.
The error occurs further (not on CPU).
The error occurs further
(not on the GOT 2) (bus interface module).
The error will not occur.
End
Check the error code/step appearing on the PLC CPU.
(Obtain the status of the error and the location where the error occurs.)
Turn off the power of the GOT.
Turn off the power of the PLC CPU.
Turn on the power of the PLC CPU.
Turn on the power of the GOT.
Turn off the power of the GOT.
Turn off the power of the PLC CPU.
Turn on the power of the PLC CPU.
Turn on the power of the GOT.
Turn off the power of the GOT.
Turn off the power of the PLC CPU.
Turn on the power of the PLC CPU.
Turn on the power of the GOT.
The bus-connection cable connecting the GOT 1) to the GOT 2) is judged faulty.
Replace the faulty bus-connection cable with a new one.
Disconnect the bus-connection cable from the GOT 2) at IN side
(to further locate the error positions).
Disconnect the bus-connection cable from the GOT 1) at OUT side
(to further locate the error positions).
PLC (main base module)
Extension cable
Bus-connection
cable
Bus-connection
cable
GOT 1) GOT 2)