Mitsubishi Electric QJ71MB91 User Manual page 82

4
MODBUS STANDARD FUNCTIONS
(1) Request message format (Master
(2) Response message format (Slave
4
- 27 4.11 Diagnostics (FC: 08)
4.11.2 Restart communications option (sub-function code: 01)
Function code Sub-function code
Function
Sub-function code
code
(0001
(08 )
H
(H)
Figure 4.30 Restart communications option (Request message)
(When completed normally)
The slave returns the request message received from the master without change.
However, if a request message is received during listen only mode, the status will only
return to online mode and no response message will be returned.
(When completed with an error)
Function code
Data
Function
Exception
code 1
code*
(88 )
H
Figure 4.31 Restart communications option (Exception message)
* 1 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
Slave)
Data
Clear setting of
Communications event log
)
H
0000 : Not clear
H
FF00 : Clear
H
(L)
(H)
Master)
(L)