Exception Code List - Mitsubishi QJ71MB91 User Manual

11
TROUBLESHOOTING

11.4.2 Exception code list

"Exception code" is an error code common to the MODBUS
embedded in a response message when a slave returns an error response in reply to a
request message sent from the master.
(1) When the QJ71MB91 is a master
(2) When the QJ71MB91 is a slave
Exception
Error name
code
01
H
Illegal Function
(1)
02 Illegal Data
H
(2) Address
03
H
Illegal Data Value
(3)
04 Slave Device
H
(4) Failure
When the QJ71MB91 (master) has received an exception code from the target device
(slave), take corrective actions referring to the manual for the target device (slave).
When the target device (master) has received an exception code from the QJ71MB91
(slave), take corrective actions referring to the following.
(a) Exception code storage location
When processing on a slave (QJ71MB91) has completed in error, the exception
code can be confirmed by the Error log area (address: 0CFE
buffer memory.
(b) Exception code list
The following is a list of exception codes used when the QJ71MB91 is a slave
Table11.15 Exception code list
Description
The slave (QJ71MB91) received
an unsupported function code.
The specified address of the
MODBUS device is erroneous.
A value contained in the data unit
of the request message is
incorrect.
An unrecoverable error occurred
while the slave (QJ71MB91) was
attempting to perform the
requested action.
Corrective action
Target device (Master side)
Check function codes supported
by the QJ71MB91, and modify the
request message to be sent.
Check the MODBUS device
type and size supported by the
QJ71MB91, and correct the
specified address in the request
message to be sent.
Review the data unit of the
request message.
Review the data unit of the
request message.
11.4.2 Exception code list
protocol, which is
to 0DFF ) in the
H H
QJ71MB91 (Slave side)
-
-
-
Remove the cause of the error
occurred on the QJ71MB91 side.
If the QJ71MB91 issued this code,
check the error code in the Error
log area and take corrective
actions.
( Section 11.4.1 (8))
(Continued on next page)
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11.4 Error Codes
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