Mitsubishi QJ71MB91, User Manual

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4
MODBUS(R) STANDARD FUNCTIONS
4.18 Write File Record (FC: 21) (SC: 06)
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(2) Response message format (Slave Master)
(When completed normally)
The slave returns the request message received from the master without change.
(When completed with an error)
* 1 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
POINT
Even if the slave (QJ71MB91) receives this function with the programmable
controller CPU file register (ZR) set as read only (for example, the storage
location of the file register [ZR] is a Flash card), the slave responds normally.
In this case, however, the Write file record is not performed.
When performing the Write file record, previously confirm whether the
programmable controller CPU file register (ZR) is writable.
Figure 4.95 Write file record (Exception message)
Data
Function
code
Function
code
(95
H
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Exception
code*
1