Mitsubishi Electric MELSEC L Series User Manual page 111

Error code
D827H
D902H
D903H
D905H
D906H
D909H
D90AH
D90BH
D90CH
D90DH
DA00H and
DA01H
DA10H to DA18H
DAF2H
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Error
Communication RAM error
Incorrect online test data
Communication test retry error
Communication monitoring timeout in
communication test
Communication test transmission
completion wait timeout
Header information error in transient
transmission
Communication test data received
twice
Incorrect number of stations
Invalid communication test target
station
Cable test retry error
Head module error
Head module error
Flash ROM error
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• A malfunction may have occurred due to noise. Check the wire and cable
distances and grounding condition of each device, and take measures to
reduce noise.
• Execute a unit test for the head module. If a failure occurs again, the
possible cause is a hardware failure of the head module. Please consult
your local Mitsubishi representative.
• Check the data at the station that started the online test, and retry the
operation.
• If the error occurs again even after taking the above, please consult your
local Mitsubishi representative.
After completion of the communication test, retry the operation.
• Check the network status by executing the CC-Link IE Field Network
diagnostics using the programming tool, take action, and retry the
operation.
• Check if the routing parameters are correctly set.
• Check the network status by executing the CC-Link IE Field Network
diagnostics using the programming tool, take action, and retry the
operation.
• Reduce the frequency of transient transmission, and retry the operation.
• When the mode of the master station is "Online (High Speed Mode)",
change it to "Online (Normal Mode)" and retry the operation.
• Check if the routing parameters are correctly set.
Correct the header information at the request source, and retry the
operation.
After completion of the communication test, retry the operation.
• Check the network status by executing the CC-Link IE Field Network
diagnostics using the programming tool, and take action.
• If the number of slave stations per network is more than 120, reduce it to
120 or less.
Check the "Target Station" setting in the "Communication Test" window, and
retry the operation.
After completion of the cable test, retry the operation.
• A malfunction may have occurred due to noise. Check the wire and cable
distances and grounding condition of each device, and take measures to
reduce noise.
• Execute a unit test for the head module. If a failure occurs again, the
possible cause is a hardware failure of the head module. Please consult
your local Mitsubishi representative.
• A malfunction may have occurred due to noise. Check the wire and cable
distances and grounding condition of each device, and take measures to
reduce noise.
• Execute a unit test for the head module. If a failure occurs again, the
possible cause is a hardware failure of the head module. Please consult
your local Mitsubishi representative.
• If the number of writes to the flash ROM has exceeded 100000, clear the
checkbox in "Communication Head Setting" of PLC parameter so that data
of the error history and system error history will not be held when the
system is powered off or the head module is reset.
• Check the wire and cable distances and grounding condition of each
device, and take measures to reduce noise.
• Execute a unit test for the head module. If a failure occurs again, the
possible cause is a hardware failure of the head module. Please consult
your local Mitsubishi representative.
CHAPTER 11 TROUBLESHOOTING
Action
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