Mitsubishi Electric QJ71LP21 Reference Manual page 237

8 TROUBLESHOOTING
Error No. Description of error
F821 Station-specific parameter error
F822 System error
F823 Parameter consistency error
F825 CPU parameter check error
F826 Parameter mismatch error
F828 No control station shift setting
F829 No pairing setting
F830 System error
F831 System error
F832 Data link startup condition error
F833 Keyword error
F834 System error
F835 System error
F836 System error
F837 Exceeded number of retries
F838 Relevant timer timeout
No link parameter
F839
(communication impossible)
F83A SW0000 out of range error
F83B Forced switching impossible error
F840 Low speed cyclic parameter error
F841 System error
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Table 8.1 Error code list (Continued)
Review station-specific parameters.
Set common parameters
the host station.
If no station-specific parameters are set, the hardware of the CPU or network
module is faulty.
Contact your local Mitsubishi representative.
The hardware of the CPU or network module is faulty.
Contact your local Mitsubishi representative.
Set common parameters
the host station.
If no station-specific parameters are set, the hardware of the CPU or network
module is faulty.
Contact your local Mitsubishi representative.
Rewrite the network parameters for the control station to the PLC.
If the error recurs, the hardware of the CPU or network module is faulty.
Contact your local Mitsubishi representative.
Set parameters suitable for the sub control station, or activate it as a control
station.
Review and reset the parameters for the master and sub master stations.
If the error recurs, the hardware of the CPU or network module is faulty.
Contact your local Mitsubishi representative.
Set "with data link by the sub control station when the control station is down."
Set "with pairing" to the station connected to the redundant system
(QnPRHCPU).
The hardware of the CPU or network module is faulty.
Contact your local Mitsubishi representative.
If the data link is stopped under all station specification, start it by all station
specification.
If the data link is stopped under specific station specification, start it from the
station, or forcibly start it.
Start the data link from the station where it was discontinued, or forcibly start it.
The cable is faulty, or the hardware of the network module is faulty.
If a communication error has occurred, review the cable.
If not, the hardware of the network module is faulty.
Contact your local Mitsubishi representative.
Check the status of the control station and of the remote master station (to see
if resetting or an error occurs in the middle of the operation).
Check the status of the control station and of the remote master station (to see
if resetting or an error occurs in the middle of the operation).
Register link parameters
Correct the contents of SW0000.
Check if the following conditions are met:
• The system is a multiplexed remote I/O network system.
• Check if "Return as a standby station" is set as the parameter for the master
station.
• The host station is operating as a master station.
• The operating sub master station is in data-linking.
Create and write network parameters to the PLC.
If the error recurs, the hardware of the CPU or network module is faulty.
Contact your local Mitsubishi representative.
Corrective measure
station-specific parameters for the sending range of
station-specific parameters for the sending range of
MELSEC-Q
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