Mitsubishi QJ71MB91, User Manual

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4
- 41 4.11 Diagnostics (FC: 08)
4.11.13 Return slave busy count (sub-function code: 17)
4
MODBUS(R) STANDARD FUNCTIONS
4.11.13 Return slave busy count (sub-function code: 17)
Reads out the number of busy responses to the master.
The QJ71MB91 always returns "0".
(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 4.60 Return slave busy count (Request message)
Figure 4.61 Return slave busy count (Normal response message)
Figure 4.62 Return slave busy count (Exception message)
(L)
Data
(L)
Function code
Function
code
(08
H
)
Sub-function code
Sub-function code
(0011
H
) (0000
H
)
(H)
(H)
(L)
Data
(L)
Function code
Function
code
(08
H
)
Sub-function code
Sub-function code
(0011
H
)
Slave busy count value
(0000
H
) *
1
The QJ71MB91 returns the slave busy count value of the buffer
memory to the master. (address: 0F09
H
/0F49
H
)
(H)
(H)
Data
Function code
Function
code
(88
H
)
Exception
code * 2