Return Iop Overrun Error Count (Sub-Function Code: 19) - Mitsubishi Electric QJ71MB91 User Manual

4
MODBUS STANDARD FUNCTIONS

4.11.15 Return IOP overrun error count (sub-function code: 19)

Reads the IOP overrun error counter value to the master.
The QJ71MB91 returns to the master the number of times the request message size
exceeds the upper limit.
(Same as the Return bus character overrun count)
(1) Request message format (Master
(2) Response message format (Slave
4
- 43 4.11 Diagnostics (FC: 08)
4.11.15 Return IOP overrun error count (sub-function code: 19)
Function code
Sub-function code
Function
Sub-function code
code
(0013
(08 )
H
(H)
Figure 4.66 Return IOP overrun error count (Request message)
(When completed normally)
Function code
Sub-function code
Function
Sub-function code
code
(0013
(08 )
H
(H)
The QJ71MB91 returns the bus character overrun count value
of the buffer memory to the master. (address: 0F02
Figure 4.67 Return IOP overrun error 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 4.68 Return IP overrun error 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
Bus character
) overrun count value
H
(0000 to FFFF
H
(L)
(H)
/0F42
H
)
H
(L)
1
) *
H
(L)
)
H