Mitsubishi QJ71LP21 Reference Manual page 247

8 TROUBLESHOOTING
Error No. Description of 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
FD26 Light check forward side error
FD27 Light check reverse side error
FD28 RAM check error
FD29 ROM check error
FD2A Timer function check error
FD2B WDT function check error
FD31 Duplicate online diagnostics request error
FD32 System error
FD33 System error
FD35 Response wait time-out occurred
FD36 Action wait time-out occurred
FD37 Another online diagnosis executed
FD38 Duplicate message error
Communication test request destination
FD39
error (host station)
Communication test request destination
FD3A error (station to which the test cannot be
requested)
FE20 Received data error
FE21 ZNRD/ZNWR device range error
FE22 AnU request error
FE23 System error
FE24 System error
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Table 8.1 Error code list (Continued)
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.
Contact your local Mitsubishi representative.
Conduct a test that can be executed in the bus topology.
Create and write new network parameters to the PLC.
If the error recurs, the hardware of the CPU or network module is faulty.
Contact 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.
Contact your local Mitsubishi representative.
There is a problem with the cable.
Connect a proper cable, and perform an online test.
The hardware of the network module is faulty.
Contact your local Mitsubishi representative.
Execute online diagnostics after another is completed.
The hardware of the network module is faulty.
Contact your local Mitsubishi representative.
Retry after a little while.
Check the status of the relevant station and of the line.
Change the test request destination.
A station to which a test request is not available was specified.
GX Developer
C
Review the routing parameters, or replace the relay CPU module with the AnU
or QnA CPU module compatible with the MELECNET/10.
Review the range of the device to be accessed with the ZNRD/ZNWR
instructions to the ACPU.
Check if access to other station is made from GX Developer with a project of a
different CPU type.
The hardware of the source module starting dedicated instructions and MC
protocol is faulty.
Contact your local Mitsubishi representative.
Confirm the status of the target station and relay station CPU modules.
Alternatively, change the CPU module concerned.
Corrective measure
N C N C N N C N
MELSEC-Q
C :CPU module
N :Network module
:Communication request
disabled station
C N N C N
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