..
.
.
3.
SPECIFICATIONS
/MELSEC-A
3.5
Buffer
Memory
The AD71 has
a
battery backed buffer memory for communication
of data with the
PC
CPU. The memory map
is
shown in Fig.
3.22.
Data can be read from the buffer memory
as
follows:
0
Reading data using the sequence program
One word (16 bit) or
two
word data can
be
read by using the
buffer read application instructions.
0
Reading
data using the AGGPP
For details, refer to the SWOGP-AD71P Operating Manual.
Data can be written to the buffer memory
as
follows:
(The writing of data may
be
restricted depending on the status of the
AD71. General
write
conditions are shown in Fig.
3.22.
For further
details, refer to Section 3.5.1 to
3.5.6.)
a
Writing data from the sequence program
One word (16 bit) or two word data can be written by using
the buffer write application instructions.
0
Writing data from the AGGPP
Transfers data in blocks from the A6GPP memory to the
buffer memory.
An additional function allows individual pieces of positioning data to
be written to the buffer memory if the AD71
is
busy. For details,
refer to the SWOGP-AD71
P
Operating Manual.
I
REMARKS
I
For
buffer memory access instructions, refer
to
Chapter
6
"Programming."
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