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Mitsubishi Electronics AJ65bt-r2 Manuel D’Utilisation

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MELSEC-A
5   PRELIMINARY INFORMATION
5.7.3 Reading the R2 buffer memory
When reading the R2 buffer memory using the transmission/reception buffer, after the
control data is written to the transmission buffer, the data is read from 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
R2
Programmable controller CPU
Master station
1) Control data
Bit device
Word device
Remote 
input (RX)
Remote 
output (RY)
Remote 
output (RY)
Remote 
input (RX)
Buffer 
memory
5) Intelligent device station access 
    complete ON
7) Intelligent device station access 
    complete OFF
2) Intelligent device station access 
    request ON
6) Intelligent device station access 
    request OFF
Transmission 
buffer
Reception 
buffer
* When using the RIRD (RIRCV) command, 
   the steps 2) to 7) are carried out automatically.
3) Read command
8) Reception data
4) Control data + reception data
(2)   Timing chart
1)
2)
3)
4)
5)
6)
7)
8)
Carried out with sequence program
Carried out by R2
Intelligent device station access 
request signal           (RY(n+1)E)
Intelligent device station access 
complete signal        (RX(n+1)E)
Programmable controller CPU
word device
Master station 
transmission buffer
Master station 
reception buffer
R2 buffer memory
No.
Details
Control side
1)
The control data is written to the master station transmission buffer.
Program
2)
The intelligent device station access request signal (RY(n+1)E) turns ON.
Program
3)
The contents set in the control data are conveyed to the R2.
R2
4)
The control data is stored in the master station reception buffer.
R2
5)
The intelligent device station access complete signal (RX(n+1)E) turns ON.
R2
6)
The intelligent device station access request signal (RY(n+1)E) turns OFF.
Program
7)
The intelligent device station access complete signal (RX(n+1)E) turns OFF.
R2
8)
The reception data is read from the master station reception buffer.
Program