Mitsubishi QJ71MB91, User Manual

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4
MODBUS(R) STANDARD FUNCTIONS
4.10 Read Exception Status (FC: 07)
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4.10 Read Exception Status (FC: 07)
Reads error status.
(1) Request message format (Master Slave)
(2) Response message format (Slave Master)
(When completed normally)
* 1 The data of the device specified in the Setting error status read device (address: 000A
H
to 000B
H
)
in the buffer memory are stored in the error information area. ( Section 7.3.4)
(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 4.25 Read exception status (Request message)
Figure 4.26 Read exception status (Normal request message)
Figure 4.27 Read exception status (Exception message)
Function code
Function code
(07
H
)
Data
Function code
Function
code
(07
H
)
Error
information *1
Data
Function code
Function
code
(87
H
)
Exception
code *
2