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MELSEC-Q
8 TROUBLESHOOTING
Table 8.1 Error code list (Continued)
Error code Description Corrective action
FD1C
Interruption error due to loop switching
during test
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.
FD1D System error
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
FD1E Bus topology, test disabled error Conduct a test that can be executed in the bus topology.
FD20 Mode error
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.
FD21 Hardware error (send interrupt error)
The cable was disconnected during the online test.
Reconnect the cable, and continue the online test.
FD22 Hardware error (receive interrupt error)
FD23 Data comparison error
Check for faulty cables, faulty hardware, incorrect wiring, and absence of
terminating resistor (in the case of the bus). In addition, check whether the
same station number has been set for two or more stations or whether two or
more control stations exist.
FD24 Retry over
FD25 Input port initial value check error
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
FD26 Light check forward side error
There is a problem with the cable.
Connect a proper cable, and perform an online test.
FD27 Light check reverse side error
FD28 RAM check error
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
FD29 ROM check error
FD2A Timer function check error
FD2B WDT function check error
FD31 Online test request error
Wait until a currently-executed online test ends, and execute another online
test.
FD32 System error
The hardware of the network module is faulty.
Please consult your local Mitsubishi representative.
FD33 System error
FD35 Response wait time-out occurred
Retry after a little while.
Check the status of the relevant station and of the line.
FD36 Action wait time-out occurred
FD37 Another online test being executed
FD38 Duplicate message error
FD39
Communication test request destination
error (host station)
Change the test request destination.
FD3A
Communication test request destination
error (station to which the test cannot be
requested)
A station to which a test request is not available was specified.
GX Developer
C
N
CCC CC CNNNNNNNN
:CPU module
:Network module
:Communication request
disabled station
FE20 Received data error
Review the routing parameters, or replace the relay CPU module with the AnU
or QnA CPU module compatible with the MELECNET/10.
FE21 ZNRD/ZNWR device range error
Review the range of the device to be accessed with the ZNRD/ZNWR
instructions to the ACPU.
FE22 AnU request error
Check if access to other station is made from GX Developer with a project of a
different CPU type.
FE23 System error
The hardware of the source module starting dedicated instructions and MC
protocol is faulty.
Please consult your local Mitsubishi representative.
FE24 System error
Confirm the status of the target station and relay station CPU modules.
Alternatively, change the CPU module concerned.