Mitsubishi QJ71MT91 User Manual page 260

11 TROUBLESHOOTING
Error
Error Name
Code
73CC
H
Offline mode
error
73CD
H
73D0
H
Response
message
transmission
failure
73D1
H
Preferred
connection
73D2
H
count over
error
Response
message
73D3
H
transmission
failure
73D4
H
Send/receive
processing
interruption
73D5
H
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Description
In the offline mode,
MODBUS device
R
assignment parameter setting
request (Y8) was turned on.
In the offline mode, PING test
execution request (Y1C) was
turned on.
As the TCP connection was
cut off from the target device,
the slave function of the
QJ71MT91 could not send a
response message.
As the TCP connection was
cut off from the target device,
the response message could
not be returned via GX
Developer connection.
TCP connections exceeding
the number preset in the
preferred node specification
was attempted to be
established.
As the TCP connection was
cut off from the target device,
the response message via GX
Developer connection could
not be returned.
The send/receive processing
was forcibly interrupted by the
basic parameter setting
processing.
An error occurred in the TCP
connection and the
send/receive processing was
forcibly interrupted.
As the TCP connection was
being closed, the send/receive
processing was interrupted.
Lit LED Corrective Action
Do not turn on MODBUS
device assignment parameter
COM.ERR.
setting request (Y8) in the offline
mode.
Do not turn on PING test
COM.ERR. execution request (Y1C) in the
offline mode.
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
• Increase the maximum number
of TCP connections with the
target node in the preferred
node specification.
COM.ERR.
• Decrease the number of
connections simultaneously
used with the target node.
• Check whether the operation
status of the target device is
normal or not.
COM.ERR.
• Check the line status for an
error.
Perform the basic parameter
setting processing after the
COM.ERR.
send/receive processing is over.
• Retry after a little while.
• Check whether the operation
status of the target device is
COM.ERR.
normal or not.
• Check the line status for an
error.
• If this occurs at execution of the
dedicated instruction, set "TCP
connection is not closed after
instruction completion" in the
close option of the execution
type.
• If the number of connections
used exceeds the maximum
COM.ERR.
(64), bring it within the range.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
error.
• Retry after a little while.
MELSEC-Q
Occurrence
1) 2) 3) 4)
R
(Continued on next page)
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5)