Table of Contents
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11
TROUBLESHOOTING
Error
Error Name
Code
MODBUS device
7331
upper limit value
H
over error
MODBUS device
7332
assigned range
H
overlap error
Buffer memory
7333
assigned range
H
error
Device upper limit
7334
H
value over error
Target MODBUS
7340
device type
H
specification error
7343
H
Response
monitoring timer
setting error
7344
H
Buffer memory
7345
address overlap
H
error
11 - 26
Description
The head MODBUS device
number + assignment points
in the MODBUS device
assignment parameter
exceeds the maximum
(65535) of the MODBUS
device.
MODBUS device ranges set
with the MODBUS device
assignment parameters are
overlapped.
The assigned range of the
QJ71MT91 buffer memory
set with the MODBUS device
assignment parameters
exceeds the set range of the
user free area.
The head device number +
assignment points in the
MODBUS device assignment
parameter exceeds the
maximum (65535) of the CPU
device.
The setting of the target
MODBUS device type
specification in the automatic
communication parameter is
incorrect.
The setting of the response
monitoring timer in the
automatic communication
parameter is outside the
setting range.
The setting of the response
monitoring timer in the
automatic communication
parameter is less than the
setting of the split reception
monitoring timer value.
The setting ranges of the
buffer memory in the
automatic communication
parameter overlap between
multiple parameters.
Lit LED
Corrective Action
Review the setting of the head
MODBUS device number and
COM.ERR.
assignment points.
Review the setting of the head
MODBUS device number and
COM.ERR.
assignment points.
Review the setting of the head
device number and assignment
COM.ERR.
points.
Review the setting of the head
device number and assignment
COM.ERR.
points.
Review the setting of the target
MODBUS device type
COM.ERR.
specification.
Review the setting of the
response monitoring timer so
COM.ERR.
that it falls within the setting
range.
Make the response monitoring
timer greater than the split
COM.ERR.
reception monitoring timer
value.
Correct the overlapping buffer
COM.ERR.
memory settings.
MELSEC-Q
Occurrence
1)
2)
3)
4)
(Continued on next page)
11 - 26
5)
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