Mitsubishi Electric L26CPU-BT User Manual page 131

(2) Communication between the master and intelligent device stations by
transient transmission
Transient transmission is one of the transmission methods, and by which data are sent or received at any timing
on a one-to-one basis (1:1) by specifying the target.
[Writing data to the buffer memory in the intelligent device station using the G(P).RIWT instruction]
1.
Data to be written to the buffer memory in an intelligent device station is stored in the send buffer
in the master module.
2.
The data is written to the buffer memory in the intelligent device.
3.
The intelligent device returns a writing complete response to the master station.
4.
The devices specified with the G(P).RIWT instruction are turned on.
Programmable controller CPU
G(P).RIWT
Device memory
4)
[Reading data from the buffer memory in the intelligent device station using the G(P).RIRD instruction]
1.
The data in the buffer memory of an intelligent device station is accessed.
2.
The data read is stored in the receive buffer of the master station.
3.
The data is stored in the device memory of the programmable controller CPU and the devices
specified with the G(P).RIRD instruction are turned on.
Master station
Programmable controller CPU
G(P).RIRD
Device memory
3)
Before performing data communication using transient transmission, the sizes of the send and receive buffers must be set
up in the buffer memory of the master station.
For details on setting the sizes of the send and receive buffers, refer to
Master station
Master module
1)
Send buffer
Master module
Receive buffer
CHAPTER 8 FUNCTIONS
Intelligent device station
2)
Buffer memory
3)
Intelligent device station
1)
Buffer memory
2)
Page 83, Section 7.3.2 (2).
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