Mitsubishi Electric L26CPU-BT User Manual page 125

(2) Communication between the master and local 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 a local station using the G(P).RIWT instruction]
1.
Data to be written to the buffer memory in a local station is stored in the send buffer in the master
module.
2.
The data is written to the buffer memory in the local station.
3.
The local station 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 a local station using the G(P).RIRD instruction]
1.
The data in the buffer memory of the local 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.
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 station
Master module
Receive buffer
CHAPTER 8 FUNCTIONS
Local station
2)
Buffer memory
3)
Local station
1)
Buffer memory
2)
Page 83, Section 7.3.2 (2).
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