Mitsubishi LJ61BT11 User Manual page 126

(2) Communication between the master and intelligent device stations
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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.
Master station
Programmable controller CPU
1)
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)
Master module
Send buffer
Master module
Receive buffer
8 FUNCTIONS
Intelligent device station
2)
Buffer memory
3)
Intelligent device station
1)
Buffer memory
2)
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