Writing To The R2 Buffer Memory - Mitsubishi MELSEC AJ65BT-R2 User Manual

5 PRELIMINARY INFORMATION

5.7.4 Writing to the R2 buffer memory

Programmable controller CPU
2) Intelligent device station access
Bit device
6) Intelligent device station access
1) Control data + transmission data
Word device
Intelligent device station access
request signal
Intelligent device station access
complete signal
Programmable controller CPU
word device
Master station
transmission buffer
No.
The control data and buffer memory value to be changed are written to the master
1)
station transmission buffer.
2) The intelligent device station access request signal (RY(n+1)E) turns ON.
The contents of the master station transmission buffer are stored in the R2 buffer memory.
3)
(Only transmission data)
4) The control data is stored in the master station reception buffer.
5) The intelligent device station access complete signal (RX(n+1)E) turns ON.
6) The intelligent device station access request signal (RY(n+1)E) turns OFF.
7) The intelligent device station access complete signal (RX(n+1)E) turns OFF.
When writing to the R2 buffer memory using the transmission/reception buffer, after the
control data and transmission data are written to the transmission buffer, the data can
be written to the buffer memory by turning the intelligent device station access request
(complete) signal (RY(n+1)E, RX(n+1)E) ON and OFF.
(1) Flow of process
request ON
request OFF
(2) Timing chart
(RY(n+1)E)
(RX(n+1)E)
1)
Master station
reception buffer
R2 buffer memory
Master station
5) Intelligent device station access
complete ON
Remote
7) Intelligent device station access
input (RX)
complete OFF
Remote
output (RY)
3) Transmission data
Transmission
buffer
4) Control data
Reception
buffer
2)
3) 5)
4)
Details
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MELSEC-A
6)
7)
Carried out with sequence program
Carried out by R2
R2
Remote
input (RX)
Remote
output (RY)
Buffer
memory
Control side
Program
Program
R2
R2
R2
Program
R2