Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 328

Error Error details and causes
code
CFB0H Sending data failed due to a resend timeout.
CFB1H The external device cannot be connected. Or the
external device is disconnected.
CFB2H The same specified own station port number is already
used.
CFB3H The request to the CPU module has failed.
CFB4H An abnormal response was received from the external
device.
CFB5H The frame received from the external device is incorrect.
CFBEH A communication error has occurred with an engineering
tool during the simple CPU communication diagnostics.
CFBFH The simple CPU communication cannot be executed.
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3.5 List of Error Codes
Action
• Check the operation of the external device.
• Check the line status with the external device such as
a cable, hub, and router.
• Check and correct the latency time.
• Correct the IP address and Ethernet address of the
external device.
• Check if the external device has the ARP function, and
perform communications with an external device that
has the ARP function.
• When the communication destination is a MODBUS/
TCP-compatible device and the communication pattern
is write, do not specify Input or Input Register for the
transmission destination.
• Check if the connection cable is disconnected.
• Check the line status with the external device such as
a cable, hub, and router.
Correct the specified port number so that it is not
duplicate.
• Check and correct the monitoring time of the CPU
Response Monitoring Timer. Check and correct the
device/label access service processing setting.
Check the abnormal response code in the buffer memory.
• Check the operation of the external device. Check the
line status with the external device such as a cable,
hub, and router.
• Execute the communication status test, and if the test
was completed with an error, take the corrective action.
Execute the module communication test, and check
that there is no failure in the module.
• Take measures to reduce noise.
• If the same error code is displayed even after
executing the simple CPU communication again,
please consult your local Mitsubishi representative.
Detailed information
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