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4 TROUBLESHOOTING
4.5 List of Error Codes
D806H The receive queue is full. • Lower the transient transmission usage frequency,
and then perform again.
• Check if the switching hub and the cables are
connected properly.
• Use the COM instruction to increase the frequency
of transient transmission.
D840H Number of transient request exceeded the upper limit
of simultaneously processable requests.
• Pause the transient transmission temporarily, and
retry the operation.
• Lower the transient transmission usage frequency,
and then perform again.
D841H The request data size of memory read/write command
is out of range.
Correct the read or write size specification at the
transient request source, and retry the operation.
D842H • Routing information to the destination network
number is not registered.
• In transient transmission, the number of relay to
other networks exceeded seven.
• Correct the target network number at the request
source, and retry the operation.
• Correct the communication path from the transient
request source to the destination, and retry the
operation.
• When the dynamic routing is not used, or the
module of the series other than MELSEC iQ-R is
included, retry the operation after correcting the
routing setting.
• Change the system configuration so that the
number of relay stations may be seven or less.
D843H The module operation mode is set to a mode in which
transient transmission cannot be executed.
After completion of the module communication test,
retry the operation.
D844H Incorrect frame is received.
• Unsupported pre-conversion protocol
• Unsupported frame type
• Application header variable part
• Application header HDS
• Application header RTP
• Read command not requiring response
Correct the request data at the transient request
source, and retry the operation.
D902H The online test data is incorrect. • Correct 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.
D903H During execution of the communication test, the test
was retried.
After completion of the communication test, retry the
operation.
D905H A communication monitoring timeout has occurred in
communication test.
• Check the network status using the CC-Link IE Field
Network diagnostics of the engineering tool, and
take action. Then, retry the operation.
• Check if "Routing Setting" of "CPU Parameter" is
correctly set, and take action.
D906H Transmission completion wait timeout has occurred in
communication test.
• Check the network status using the CC-Link IE Field
Network diagnostics of the engineering tool, and
take action. Then, retry the operation.
• Lower the transient transmission usage frequency,
and then perform again.
• When "Communication Mode" in "Application
Settings" of the master station (submaster station) is
set to "High-Speed", change it to "Normal" and retry
the operation.
• Check if "Routing Setting" of "CPU Parameter" is
correctly set, and take action.
D909H The header information of transient transmission is
incorrect.
Correct the header information at the request source,
and retry the operation.
D90AH During execution of the communication test, the test
was retried.
Check the network status using the CC-Link IE Field
Network diagnostics of the engineering tool, and take
action. Then, retry the operation.
D90BH The number of stations which communicates in the
network is out of the range.
• Check the network status using the CC-Link IE Field
Network diagnostics of the engineering tool, and
take action.
• If the number of slave stations per network is more
than 120, reduce it to 120 or less.
Error
code
Error details and causes Action Detailed Information
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