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MELSEC-
A
1 OUTLINE
1.1 Features
(1) Easy communication by using the buffer memory automatic update
function.
This function automatically updates the buffer memory between the R2 and
master station at the timing set in R2.
With this, a program to read and write between the R2 and master station can be
eliminated. As the data can be read and written with just the FROM/TO
command, the program is simplified.
(This can be used with all CPUs.)
*1 The address differs as shown below
for the A Series and Q/QnA Series.
A Series : Bank 2 M 0
H
to FFF
H
Q/QnA Series : M 2000
H
to 2FFF
H
R2
Master station
Programable controller CPU
TO
FROM
Buffer memory
(Automatic
update
buffer )
Buffer
memory
Carried out with sequence program
Automatically updated
2)
3)
1)
4)
*
1
1) The data to be stored in the R2 buffer memory is written into the master
station's automatic update buffer.
2) The data is automatically written in at the R2 timing.
3) The data is automatically read at the R2 timing.
4) The corresponding master station's buffer memory is read to the data in the
R2 buffer memory to be read out.