Mitsubishi QJ71MB91, User Manual

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4
MODBUS(R) STANDARD FUNCTIONS
4.11 Diagnostics (FC: 08)
4.11.8 Return bus communication error count (sub-function code: 12)
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4.11.8 Return bus communication error count (sub-function code: 12)
Reads out the number of error messages detected on the line to the master.
(1) Request message format (Master Slave)
(2) Response message format (Slave Master)
(When completed normally)
* 1 Refer to the following for the relevant counts, count clear methods and precautions.
Section 11.3
(When completed with an error)
* 2 Exception and error codes are stored in the buffer memory in the case of error completion.
Refer to the following for storage location, confirmation methods, and detailed contents.
Section 11.4
Figure 4.45 Return bus communication error count (Request message)
Figure 4.46 Return bus communication error count (Normal response message)
Figure 4.47 Return bus communication error count (Exception message)
(L)
Data
(L)
Function code
Function
code
(08
H
)
Sub-function code
Sub-function code
(000C
H
) (0000
H
)
(H)
(H)
(L)
Data
(L)
Function code
Function
code
(08
H
)
Sub-function code
Sub-function code
(000C
H
)
Bus communication
error count value
(0000
H
to FFFF
H
) *
1
The QJ71MB91 returns the bus communication error count value
of the buffer memory to the master. (address: 0F01
H
/0F41
H
)
(H)
(H)
Data
Function code
Function
code
(88
H
)
Exception
code *
2