ABB CL Series - Page 230

Function blocks
227
1SVC 440 795 M1100
The function block operates according to the following equatio n
Y(x) = Actual output value of target range
X = Actual input value of source range
X1 = Lower value of source range
X
2
= Upper value of source range
Y
1
= Lower value of target range
Y
2
= Upper value of target range
Figure: 120: Value scaling function block – reduce value range
a Source range
b Target range
Figure: 121: Function block value scaling – increasing value range
a Source range
b Target range
Y(x) = X x
Y
2
– Y
1
+
X
2
x Y
1
– X
1
x Y
2
X
2
– X
1
X
2
– X
1
a
b
Y1
Y2
X1
X2
a
b
Y1
Y2
X1
X2