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MELSEC-
A
5 PRELIMINARY INFORMATION
(3) Default size of each area
When totaled the default size of each area is 600H.
The size of the master station automatic update area is 1000
H, so if used with the
default setting, only two R2 modules can be connected.
Users using three or more R2 modules must reduce and delete the areas not
being used to reduce the automatic update size (transmission size).
0
H
M
118
H
M
1A0
H
M
1C0
H
M
1C7
H
M
200
H
M
400
H
M
600
H
M
1F0
H
M
R2 0
H
R2 118
H
R2 400
H
R2 600
H
R2 1C7
H
R2 1C0
H
R2 1A0
H
R2 200
H
Update at timing
for each area.
Master station automatic update
buffer (Offset address)
R2 buffer memory
Initialization area
Transmission, monitor transmission area 1)
Status storage area
EEPROM function area
User registration frame area
Blank
Transmission, monitor
transmission area 2)
Reception area
Initialization area
Transmission, monitor transmission area 1)
Status storage area
EEPROM function area
User registration frame area
Blank
Transmission, monitor
transmission area 2)
Reception area
R2 1F0
H
(a) Relation of No. of modules and each area size
As the No. of R2 modules being used increases, the size of the areas other
than the initialization area and status storage area must be reduced or else
the master station buffer memory (1000
H) will be exceeded.
The sizes of the areas that can be set are described below.
1) When connecting two R2 modules
Master station automatic update buffer (1000H) –
(Initialization (1A0
H) + Status storage area (20H))
×
2 = C80H
The size of the areas, other than the initialization area, which can be
used by the two R2 modules will be C80
H.
The size per module will be 640H.
Master station (1000
H
worth)
1st station automatic
update buffer
2nd station automatic
update buffer
Initialization, status storage area (1C0H worth)
Total C80
H
(640
H
per module)
Other area
Initialization, status storage area (1C0
H
worth)
Other area