Mitsubishi LJ61BT11 User Manual page 119

(2) Communication between the master and local stations by transient
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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.
Master station
Programmable controller CPU
1)
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.
Master station
Programmable controller CPU
G(P).RIRD
Device memory
3)
Master module
Send buffer
Master module
Receive buffer
8 FUNCTIONS
Local station
2)
Buffer memory
3)
Intelligent device station
1)
Buffer memory
2)
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