Return Slave Busy Count (Sub-Function Code: 17) - Mitsubishi QJ71MB91 User Manual

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
(2) Response message format (Slave
4
- 41 4.11 Diagnostics (FC: 08)
4.11.13 Return slave busy count (sub-function code: 17)
Function code
Sub-function code
Function Sub-function code
code
(0011
(08 )
H
(H)
Figure 4.60 Return slave busy count (Request message)
(When completed normally)
Function code
Sub-function code
Function
Sub-function code
code (0011
(08 )
H
(H)
The QJ71MB91 returns the slave busy count value of the buffer
memory to the master. (address: 0F09
Figure 4.61 Return slave busy 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 4.62 Return slave busy 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
(0000
)
H
(L)
(H)
Master)
Data
Slave busy count value
)
(0000
H
(L)
(H)
/0F49 )
H H
)
H
(L)
1
) *
H
(L)