Specific Example Of Troubleshooting - Mitsubishi Electric GOT2000 Series User Manual

12.2.3

Specific example of troubleshooting

With the following system as an example, this section shows a troubleshooting when an error occurs in the PLC CPU.
(When QnASCPU and an extension base unit are used)
Disconnect the bus connection cable from the GOT 2) at IN side. (to further identify the error positions)
Disconnect the bus connection cable from the GOT 1) at OUT side. (to further identify the error positions)
The bus connection cable connecting the GOT 1) to the GOT 2) is identified as faulty.
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12.2 Troubleshooting for the Bus Connection
PLC
(main base unit)
Extension
PLC
cable
(extension base unit)
Check the error code/step appearing on the PLC CPU.
(Identify the status of the error and the location where the error occurs.)
The SP. UNIT DOWN message appears on the PLC CPU.
Turn off the power of the GOT.
Turn off the power of the PLC.
Replace the faulty PLC CPU with a new one.
Turn on the power of the PLC.
Turn on the power of the GOT.
A further error occurs. (not on PLC CPU.)
Turn off the power of the GOT.
Turn off the power of the PLC.
Turn on the power of the PLC.
Turn on the power of the GOT.
A further error occurs.
(not on the GOT 2) (bus connection unit)).
Turn off the power of the GOT.
Turn off the power of the PLC.
Turn on the power of the PLC.
Turn on the power of the GOT.
No error occurs.
Replace the faulty bus connection cable with a new one.
GOT 1)
Bus connection Bus connection
cable cable
Start
End
GOT 2)