Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 430

8 TROUBLESHOOTING
Error No.
F901 System error
F902 System error
F903 System error
F904 System error
F905 System error
FD01 CRC error (offline test)
FD02 Overrun error (offline test)
FD03 AB. IF error (offline test)
FD04 TIME error (offline test)
FD05 Data error (offline test)
FD06 Under error (offline test)
FD07 Send failure
FD08 Send failure (coaxial/twisted bus system)
FD09 Loop status changed (offline loop test)
FD0A Unstable communication (offline loop test)
FD0B Wiring error (offline loop test)
FD0C System error
FD11 Error occurred during test execution
FD12 Disconnecting error
FD13 System error
FD14 System error
FD15 System error
FD16 System error
FD17 System error
FD18 System error
FD19 System error
FD1A Station with duplicated station number
FD1B Test abort error
Interruption error due to loop switching
FD1C
during test
FD1D System error
FD1E Bus topology, test disabled error
FD20 Mode error
FD21 Hardware error (send interrupt error)
FD22 Hardware error (receive interrupt error)
FD23 Data comparison error
FD24 Retry over
FD25 Input port initial value check error
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Table 8.1 Error code list (continued)
Description of error
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
Check the system configuration to see if there are eight or more relay networks
in the MELSECNET/H.
The hardware of the CPU or network module is faulty.
Please consult your local Mitsubishi representative.
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
There is no need to take corrective measures because the system retries the
operation.
If the error frequently occurs, check for faulty cables, faulty hardware, noise,
absence of terminating resistor (in the case of the bus), and incorrect wiring.
Check if the cable is not connected or is loose or faulty and if the terminating
resistor is not connected.
There is no need to take corrective measures because the system retries the
operation (do not switch the loop in the middle of the operation).
If the error frequently occurs, check the line and the wiring status.
Check the wiring.
There is a problem with the hardware of the network module.
Please consult your local Mitsubishi representative.
Execute after the completion of the test from other station.
Review the cause for why the station is being disconnected.
Set the total number of link stations with a common parameter.
Set a station number that is equal to the host station number or larger.
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
Check the duplicate station number, and correct it.
The ongoing test was interrupted due to the resetting of the test executing
station.
There is a faulty station on the networks.
There is no need to take corrective measures because the system retries the
operation (do not switch the loop in the middle of the operation).
If the error frequently occurs, check the line and the wiring status.
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
Conduct a test that can be executed in the bus topology.
Create new network parameters and perform Write to PLC.
If the error reoccurs, the hardware of the CPU or network module is faulty.
Please consult your local Mitsubishi representative.
The cable was disconnected during the online test.
Reconnect the cable, and continue the online test.
Check for faulty cables, faulty hardware, incorrect wiring, absence of
terminating resistor (in the case of the bus), and duplication of station numbers,
and control stations.
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
MELSEC-Q
Corrective measure
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