IDEC MicroSmart - Manual (Page 327)

19: C OORDINATE C ONVERSION I NSTRUCTIONS
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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 star tup, XYFS specifies two points.
When input I0 is on, CVXTY conver ts the value in D10
and stores the result in D20.
When input I1 is on, CVYTX conver ts 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)