Mitsubishi QJ71MB91 User Manual page 339

11
TROUBLESHOOTING
Error code Error Name
Automatic
7370 communication
H
function stop request
(29552)
error
Automatic
7371
communication
H
(29553) parameter setting
request error
7372
H
Switch change error
(29554)
Automatic
communication
7373
H
parameters set
(29555)
during switch setting
change
MODBUS device
assignment
7374
H
parameters set
(29556)
during switch setting
change
7378
H
(29560)
Response
monitoring timer
timeout error
7379
H
(29561)
737B Request interval
H
timer timeout error
(29563)
Table11.16 Error code list (Continued)
Error definition
The automatic communication stop
request (Y6, YE) was made with the
automatic communication function
stopped.
The automatic communication
parameter setting request/automatic
communication parameter start request
(Y4, YC) was made with the automatic
communication function active.
In the control data of the UINI
instruction, an out-of-range or invalid
value is set.
Automatic communication parameters
were set during execution of the UINI
instruction.
Or, the UINI instruction was executed
while automatic communication
parameters were being set.
MODBUS device assignment
parameters were set during execution
of the UINI instruction.
Or, the UINI instruction was executed
while MODBUS device assignment
parameters were being set.
The response monitoring timer timed
out in the automatic communication
function.
In the case of broadcast, the broadcast
delay has expired before completion of
the request message transmission.
When broadcast was performed
beforehand, response is not possible
because the slave is currently
executing the processing requested by
the broadcast.
The response monitoring timer timed
out when using the dedicated
instruction.
In the case of broadcast, the broadcast
delay has expired before completion of
the request message transmission.
When broadcast was performed
beforehand, response is not possible
because the slave is currently
executing the processing requested by
the broadcast.
A request message, for which no
response is expected, was sent to a
slave by the MBREQ instruction.
(excluding the case of broadcast)
The time for issuing the next request
was reached before the current request
is completed.
Corrective Action
Prevent the automatic communication
stop request (Y6, YE) from being
issued with the automatic
communication function stopped.
Stop the automatic communication
function before making the automatic
communication parameter setting
request/automatic communication
parameter start request (Y4, YC).
Review the control data of the UINI
instruction.
Prevent concurrent execution of the
UINI instruction and auto
communication parameter setting.
Prevent concurrent execution of the
UINI instruction and MODBUS
device assignment parameter setting.
• Check if the target device is
operating normally.
• If an error has occurred in the target
device, remove the error.
• Confirm the line connections (cables,
wiring, etc.) with the target device.
• Check the processing time of the
target device. (Is the set value too
small? Does the timeout error occur
before response of the target device
or before completion of the request
message transmission?)
• Set a larger value.
• When the automatic communication
function and the MBRW or MBREQ
instruction are used on the same
channel, set appropriate automatic
communication parameters and
create a proper sequence program
so that the MBRW or MBREQ
instruction can be executed in the
right timing.( Section 9.2.3)
• When broadcast delay was
performed beforehand, check if the
broadcast delay value is sufficient.
• If this error occurs when a request
message, for which no response is
expected, is sent to a slave by the
MBREQ instruction, this error may
be regarded as a normal completion.
( Section 10.3 (6))
11.4 Error Codes
11.4.3 Error code list
Occurrence
1) 2) 3) 4) 5)
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