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4. PRECAUTIONS WHEN DESIGNING A SCREEN
MELSEC-A
4.6
Coordinate Ranges on a Monitor Screen
Text screen
Graphic screen
()
shows coor-
dinate positions.
80 columns
x
25 lines
X axis: 640 x Y axis: 400 (dots)
(0, 399)
(639, 399\
The size of a column is equivalent to 8 x 16 dots of graphic coordinates.
4.6.1
Display coordinates when drawing using the OED
The following shows the display coordinates area of one page when drawing
using the GED.
, - - - - - 7
,
: Full drawing area of
I
; . . . . . A
the OED
Display area (drawing)
Valid drawing area
when monitoring
, 6 3 9 , 4 1 8
!
(1) Coordinates
The display coordinate (drawing) range of one page of the GED is 640
x 480 dots. However, since the monitor screen of an AD57G displays
(
640 x 400 dots, the drawing is enabled in the 640 x 400 dots range.
In addition, since 19 dots from the top of the range cannot be used by the
GED, the coordinate range of actual drawing area is defined, as shown
above, by the solid line frame. Display (drawing) coordinates 0 and 19 of
the GED are converted to 0 and 0 of the monitor screen coordinates.
(2) Grid
When using the GED, use a 16-dot grid on the canvas screen and a
32-dot grid on the report canvas screen.
If, on the canvas screen, the 1 &dot grid is set and a graphic image is drawn
by matching
it
with the grid, that graphic image can be matched with the
column setting
(80
characters x 25 lines) displayed by
an
AD57G.
In addition, if the 32-dot grid is set on the report canvas screen, and a
graphic image is drawn by matching it with the grid, the position of the
ruled lines contained in the graphic image can be adjusted when an
AD57G is used to print them out.
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