IDEC MICROSmart FC5A Series, User Manual

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12: C
OORDINATE
C
ONVERSION
I
NSTRUCTIONS
FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y ‐ B1273 12 ‐ 5
Example: Linear Conversion
The following example demonstrates setting up two coordinate points to define the linear relationship between X and Y.
The two points are (X0, Y0) = (0, 0) and (X1, Y1) = (8000, 4000). Once these are set, there is an X to Y conversion, as well
as a Y to X conversion.
M8120 is the initialize pulse special internal relay.
At startup, XYFS specifies two points.
When input I0 is on, CVXTY converts the value in D10 and
stores the result in D20.
When input I1 is on, CVYTX converts the value in D11 and
stores the result in D21.
M8120
XYFS(I) Y1
4000
END
I0
CVXTY(I) D1
D20
I1
CVYTX(I) S1
D21
S1
0
X0
0
Y0
0
X1
8000
S1
0
S2
D10
S1
0
S2
D11
(X0, Y0)
(X1, Y1)
X
Y
0
D10 D21
D20 (1000)
D11 (2500)
The graph shows the linear relationship that is defined by the
two points:
If the value in data register D10 is 2000, the value assigned to
D20 is 1000.
For Y to X conversion, the following equation is used:
If the value in data register D11 is 2500, the value assigned to
D21 is 5000.
Y
1
2
---X =
X 2Y =
8000
(2000) (5000)