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APPENDICES
MELSEC-A
1.1
Memory Capacity Required for Canvas Screen Data and Part Data
(1)
Canvas screen data
The chart below gives kinds of data and required memory capacity.
Type of Figure Example
Capacity
Memory
I
I
l ~ t r a i g h t line
12
Rectangle
0
12
I
I
Fill
6
+
(number of figures) x
(other than rec.
1
(10
+
4 x (number of
tangle)
vertexes) *1
I
I
Polygon
6
+
(4 x (number of
(closed figure)
vertexes))
Polygon
6
+
(4 x (number of
Circle and arc
24
Type of Flgure
I
Example
I
Required Memory
Ca~acltv
illipse
20
illiptic arc
32
-re=
curve
See *2 below.
2haracter
"1: The memory capacity required when a circle of
64
or 128 dots in
diameter is filled.
64
dots: 444 bytes
128 dots: 882 bytes
*2: The memory capacity required for free curves and locus when the
following figure is drawn.
R e q u i r e d M e m o r y C a p a c i t y
Type o f F i g u r e
L e n g t h o f
a
L e n g t h o f a
Side: 32 d o t s
Side: 64 d o t s
Free curve
When the length of
a
side is 32 or 64 dots:
Polygon
(2)
Part data
The memory capacity required for one part is as follows:
Number of dots in the X axis
x
2
x
Number of dots in the Y axis (bytes)
4
(decimals are rounded off)
*
Section 4.10 gives an example of calculation of the memory capacity
required for part data.
APP
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2
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