4 TROUBLESHOOTING
4.5 List of Error Codes
275
4
D723H System link start/stop was requested during link start/
stop processing.
Retry the operation after the stop or restart of data link
is completed.
D724H Link startup/stop station specification is incorrect. Check the setting, and stop or start data link.
D725H System link start/stop was requested from a local
station.
A local station cannot start or stop data link of all or
multiple stations. Perform these operations from the
master station.
D726H The request command of transient transmission is
incorrect.
Correct the request command at the request station,
and retry the operation.
D727H Link start was requested from a station other than the
station which had requested link stop.
• Data link start was instructed from a station different
from the one that had instructed the data link stop.
Instruct data link start and data link stop from the
same station.
• The method of the data link start differs from that of
the data link stop. Instruct the data link start using
the same method as the data link stop. (Ex. Data
link is stopped using the CC-Link IE Field Network
diagnostics, and the data link is started using a
program.)
• Data link start has failed. Forcibly restart the data
link.
D728H Data link startup instruction was executed to the
station which is performing data link.
Execute the data link startup instruction to the station
where data link had been stopped.
D729H Link stop of the own station was instructed in the
station with no station number setting.
Specify the station number using the UINI instruction,
and execute the instruction again.
D731H Forced master switching command was executed from
a station other than the submaster station operating as
a master operating station.
Perform the forced master switch to the submaster
station operating as a master operating station.
D740H Transient transmission failed. • If a slave station is disconnected from the network,
identify the cause of the disconnection and take
action.
• When data link is stopped in the slave station,
identify the cause of the data link stop and take
action.
• Retry the operation after a slave station is replaced
and new one is added.
D741H A station type error of the execution station was
detected.
• Perform the operation after data link starts on the
master operating station.
• The operation cannot be performed in the local
station and submaster operating station. Perform
the operation in the master operating station.
D742H Transient transmission failed. After completion of the transient transmission, retry
the operation.
D743H A station type error of the execution station was
detected.
The operation cannot be performed on a local station.
Perform the operation in the master station and
submaster station.
D744H Flash ROM clear failed. • The flash ROM may be faulty. Check the wire and
cable distances and grounding condition of each
device, and take measures against noise.
• Execute the module communication test. If the error
occurs again even after taking the above, the
possible cause is a hardware failure of the module.
Please consult your local Mitsubishi representative.
D783H A transient transmission error was detected. • Close the CC-Link IE Field Network diagnostics
window in the engineering tool, and perform the
diagnostics again.
• Check the read request data at the request station,
and retry the operation.
D784H A transient transmission error was detected. • Close the CC-Link IE Field Network diagnostics
window in the engineering tool, and perform the
diagnostics again.
• Check the read request data at the request station,
and retry the operation.
Error
code
Error details and causes Action Detailed Information
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