Return Slave Nak Count (Sub-Function Code: 16) - Mitsubishi QJ71MB91 User Manual

4
MODBUS(R) STANDARD FUNCTIONS

4.11.12 Return slave NAK count (sub-function code: 16)

Reads out the number of NAK responses to the master.
The QJ71MB91 always returns "0".
(1) Request message format (Master
(2) Response message format (Slave
(When completed normally)
Function code
(When completed with an error)
Function code
Figure 4.59 Return slave NAK count (Exception message)
Function code Sub-function code
Function Sub-function code
code
(0010 )
H
(08 )
H
(H)
Figure 4.57 Return slave NAK count (Request message)
Sub-function code
Function
Sub-function code
code
(0010 )
H
(08 )
H
(H)
The QJ71MB91 returns the slave NAK count value of the buffer
memory to the master. (address: 0F08
Figure 4.58 Return slave NAK count (Normal response message)
* 1 Refer to the following for the relevant counts, count clear methods and precautions.
Section 11.3
Data
Function
Exception
code
code *2
(88 )
H
* 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
4.11.12 Return slave NAK count (sub-function code: 16)
Slave)
Data
(0000 )
H
(L) (H) (L)
Master)
Data
Slave NAK count value
1
(0000 ) *
H
(L) (L)
(H)
/0F48 )
H H
4.11 Diagnostics (FC: 08)
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