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4
MODBUS STANDARD FUNCTIONS
4.11.11 Return slave no response count (sub-function code: 15)
Reads to out the number of broadcast request messages received to the master.
(1) Request message format (Master
(2) Response message format (Slave
4
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4.11 Diagnostics (FC: 08)
4.11.11 Return slave no response count (sub-function code: 15)
Sub-function code
Function code
Function
Sub-function code
code
(000F
(08
)
H
(H)
Figure 4.54 Return slave no response count (Request message)
(When completed normally)
Function code
Sub-function code
Function
Sub-function code
code
(000F
(08
)
H
(H)
The QJ71MB91 returns the slave no response count value of the
buffer memory to the master. (address: 0F07
Figure 4.55 Return slave no response count (Normal response message)
* 1 Refer to the following for the relevant counts, count clear methods and precautions.
Section 11.3
(When completed with an error)
Function code
Data
Function
Exception
code
2
code *
(88
)
H
Figure 4.56 Return slave no response count (Exception message)
* 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
Slave)
Data
)
H
(0000
(L)
(H)
Master)
Data
Slave no-response count value
)
(0000
to FFFF
H
H
(L)
(H)
/0F47
)
H
H
)
H
(L)
1
) *
H
(L)
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