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4 TROUBLESHOOTING
4.5 List of Error Codes
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 transient
transmission.
D844H
Incorrect frame was received.
• Unsupported pre-conversion protocol
• Unsupported frame type
• Application header variable part
• Application header HDS
• Application header RTP
• Read command not requiring response
Execute the instruction again after correcting the request data at the
transient request source.
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 TSN/CC-Link IE Field
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 TSN/CC-Link IE Field
diagnostics of the engineering tool, and take action. Then, retry the
operation.
• Execute the instruction again after lower the transient transmission usage
frequency.
• Check if "Routing Setting" of "CPU Parameter" is correctly set, and take
action.
D909H
The header information of transient
transmission is incorrect.
Execute the instruction again after correcting the header information at the
transient request source.
D90AH
During execution of the communication test,
the test was retried.
Check the network status using the CC-Link IE TSN/CC-Link IE Field
diagnostics of the engineering tool, and take action. Then, retry the
operation.
D90BH
The number of stations that communicate in
the network is out of the specification range.
• Check the network status using the CC-Link IE TSN/CC-Link IE Field
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.
D90CH
The communication destination specified for
the communication test is incorrect.
• Correct "Target Station" of communication test, and retry the operation.
• "Communication Test" cannot be executed for own station and relay
sending station. Set "Target Station" to other than own station and relay
transmission station.
• The target station is mounted on the same base unit (main base unit and
extension base unit) as the connected station (own station). Do not
execute the communication test for station on the same base unit (main
base unit and extension base unit) as the connected station (own station).
D90DH
An error was detected in the network
module.
Please consult your local Mitsubishi representative.
D912H
Transient transmission sending failed.
• Execute the instruction again after lower the transient transmission usage
frequency.
• Check if the switching hub and the Ethernet cables are connected
properly.
D913H
to
D917H
An error was detected in the network
module.
Please consult your local Mitsubishi representative.
D919H
No response from the target station of the
communication test.
• Correct the network number, station number, or IP address for the target
station of the communication test.
• Check if the network configuration setting is correctly set in the master
station within the same network as the target station of the communication
test.
• When "IP Address" is selected for "Communication Method",
"Communication Test" cannot be executed for stations on networks
different from that of the connected station (own station). Change
"Communication Method" to "Network No./Station No.".
Error
code
Error definition and causes
Action
Detailed
information 1
Detailed
information 2
Summary of Contents for MELSEC iQ-R CC-Link IE TSN
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