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MELSEC-
A
5 PRELIMINARY INFORMATION
5.2.2 About dedicated commands for use of the buffer memory automatic update function
When the buffer memory automatic update function is used, the R2 buffer memory to
be specified differs as described below between when the FROM/TO command is
used and when the dedicated command is used.
(1) When the FROM/TO command is used
Specify the buffer memory address of the master station where the buffer
memory of the R2 to be accessed is assigned.
(2) When the dedicated command is used
Since the station number of the R2 to be accessed can be set, specify the buffer
memory of the R2 directly.
(Example) When automatic update has been set as described below, the contents of
the "status storage area (
R2
1A0H)" of station No. 2 are to be read.
When the FROM/TO command is used:
Specify the buffer memory address of the master station.
•
When the master station is the A series ............... M 560H of bank 2
•
When the master station is the Q/QnA series ...... M 2560H
When the dedicated command is used:
Specify the station number (2) and buffer memory address (
R2
1A0H)
of the R2.
0H to 19FHM
118
H
to
19F
H
M
1A0
H
to
1BF
H
M
1C0H to 2BFHM
2C0
H to 3BFH
M
3C0
H to 55FHM
4D8
H
to
55F
H
M
560
H
to
57F
H
M
580
H to 67FHM
680
H
to
77F
H
M
R2 0H to 19FH
R2
118
H
to
19F
H
R2 1A0H to 1BFH
R2 200
H
to
2FF
H
R2 300
H
to
3FF
H
R2 0H to 19FH
R2
118
H
to
19F
H
R2 1A0H to 1BFH
R2200
H
to
2FF
H
R2 300
H
to
3FF
H
2000H to 219FH
M
2118
H
to
219F
H
M
21A0
H
to
21BF
H
M
21C0H to 22BFHM
22C0
H to 23BFHM
23C0
H to 255FHM
24D8
H
to
255F
H
M
2560
H
to
257F
H
M
2580
H to 267FHM
2680
H
to
277F
H
M
Station 1
Station 2
A series
(Bank 2)
Q/QnA series
When using the FROM/TO commands, specify the buffer
memory address of the master station where the R2 buffer
memory has been assigned.
Master station buffer memory
(Automatic update buffer)
Initial setting area
Sending area 1
Status storage area
Sending area 2
Receiving area
Initial setting area
Sending area 1
Status storage area
Sending area 2
Receiving area
R2 buffer memory (Station 1)
Initial setting area (for 1A0
H
)
Sending area 1 (for 88
H
)
Status storage area (for 20
H)
Receiving area (for 100
H
)
Sending area 2 (for 100
H
)
R2 buffer memory (Station 2)
Initial setting area (for 1A0
H
)
Sending area 1 (for 88
H)
Status storage area (for 20
H)
Receiving area (for 100
H
)
Sending area 2 (for 100
H
)
When using the dedicated commands, specify the
station number and R2 buffer memory address.