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Mitsubishi Electric MELSEC Q Series User Manual Page 226

Ethernet/ip network interface module for programmable controller.
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9
TROUBLESHOOTING
Error code
Error
(Hex.)
C120
Connection failure
H
C121
Connection failure
H
C122
Connection failure
H
C123
Connection timeout The connection with the target device timed out.
H
Duplicate
C124
Forward_Open
H
error
C125
to
H
System error
C129
H
C12A
Request error
H
C12B
Request timeout
H
C12C
to
H
System error
C12D
H
Out-of-memory-
C12E
H
space error
C12F
System error
H
Thread creation
C130
H
error
Socket function
C131
H
error
C132
Non-blocking error
H
C133
System error
H
No. of sessions
C134
H
exceeded
No. of connections
C135
H
exceeded
No. of requests
C136
H
exceeded
9
- 13
9.4 Error Code
9.4.2 Error code list
Table 9.6 Communication error of the EtherNet/IP module (Continued)
Error detail
Connection establishment failed.
The target device is offline.
Connection establishment failed.
The target device is online, but not respond to a
connection request.
Connection establishment failed.
The target device is online, but returned a
connection error.
•Since Forward_Open was received from the
target device during use of the connection, the
connection status returns to the waiting-for-
Open status.
•The Originator is attempting to establish a
connection to the Target, where a connection
has already been established.
System error
Unable to connect to the specified device.
The request timed out since no response is
returned.
System error
The module runs out of available memory.
System error
Failed to create a thread.
An error occurred in the socket function.
An error occurred when the socket is set to non-
blocking mode.
System error
Number of sessions exceeded the maximum.
Number of connections exceeded the maximum.
Number of requests exceeded the maximum.
Action
•Check if the target device is operating normally.
•Check if the line status is normal
•The line may be congested. Retry after a while.
•Check if the target device is operating normally.
•Check if the line status is normal
•The line may be congested. Retry after a while.
•When "Trigger" is set to "Application Trigger" in
Class3 Tag communication, make the request
within the Timeout time.
Or, change the Timeout time.
•Increase the RPI value since data sending and
receiving may not have been available at
specified RPI due to high communication load.
•Check the conditions for the device to reopen
(Forward Open), and take corrective actions.
•Increase the value for the Target-to-Originator
Time Out Multiplier.
Please consult your local Mitsubishi
representative.
•Check if the target device is operating normally.
•Retry after a while.
•Restart the EtherNet/IP module.
•Check if the target device is operating normally.
•Check if the line status is normal
•The line may be congested. Retry after a while.
Please consult your local Mitsubishi
representative.
Restart the EtherNet/IP module.
Please consult your local Mitsubishi
representative.
Restart the EtherNet/IP module.
•Retry after a while.
•Restart the EtherNet/IP module.
Restart the EtherNet/IP module.
Please consult your local Mitsubishi
representative.
•Retry after a while.
•Restart the EtherNet/IP module.

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