Buffer Memory - Mitsubishi Electric A1SJ71PB96F User Manual

4. FUNCTIONS
4.7

Buffer Memory

The configuration of the buffer memory used to receive and send data with the AJ71PB96F/
A1SJ71PB96F and the PC CPU is shown below.
This buffer memory can be accessed using the FROM/TO instruction from the sequence program. As
shown in the following diagram, the AJ71PB96F/A1SJ71PB96F buffer memory is divided into 3 request
areas, 3 request answer areas, 1 information area and receive area, and 3 data areas and receive data
area.
Address
(decimal/hexadecimal)
0/
to
63/
64/
to
127/
128/
to
191/
192/
to
255/
256/
to
319/
320/
to
383/
384/
to
447/
448/
to
511/
512/
to
1152/
1376/
to
1407/
1536/
to
2047/
2048/
to
2559/
2560/
to
3071/
3072/
to
3535/
The unit is word (16 bits).
0h
Request area No. 1
to
(Description) This is the area in which the PC CPU sets the request data.
3Fh
40h
Request answer area No. 1
to
(Description) This is the area in which the answer for the request area No. 1 request is returned.
7Fh
80h
Request area No. 2
to
(Description) Same as No. 1.
BFh
C0h
Request answer area No. 2
to
(Description) Same as No. 1.
FFh
100h
Request area No. 3
to
(Description) Same as No. 1.
13Fh
140h
Request answer area No. 3
to
(Description) Same as No. 1.
17Fh
180h
to Unused (Reserved)
1BFh
1C0h Receive area
to
(Description) The unconfirmed service receive control information is set. The received data is set
1FFh
in the reception only data area.
200h
Information area
to
(Description) This area displays the association information.
480h
Unused
560h
Network trouble information area
to
(Description) This area displays the media level trouble information.
57Fh
Unused
600h Data area No. 1
to
(Description) This is the area in which the data to be read/write by the client function using the
7FFh
request area No. 1 is set.
800h
Data area No. 2
to
(Description) Same as No. 1
9FFh
A00h
Data area No. 3
to
(Description) Same as No. 1
BFFh
C00h
Receive data area
to
(Description) This sets the data received by the unconfirmed service.
DCFh
4-19
MELSEC-A