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5 Function blocks
5.20 LS, value scaling
216
Control Relay easy800
11/11 MN04902001Z-EN
www.eaton.com
Figure 154:Function block value scaling - increasing value range
a
Source range
b
Destination range
The mathematical relationship is follows:
•
Y = m x X + Y0
•
m = (Y2 - Y1) / (X2 - X1)
•
Y0 = ((X2 x Y1) - (X1 x Y2)) / (X2 - X1)
m = gradient
Y0 = Y offset when X = 0
X1, Y1 = First value pair
X2, Y2 = Second value pair
g = Straight line with positive gradient
Figure 155:Mathematical interrelationship
Application example
The signal of measuring value converters with a current output reaches the
input LS..I1 of the scaling function block via the output of a multiplexer
function block. The measuring value is between:
•
4 mA, corresponds to measured value 0 and
•
20 mA, corresponds to maximum measured value.
Memory
64 + per
4 Byte/Constant at function block input
Cycle time [
μ
s]
easy800 standard
easy800-SWD
224
98
a
b
Y1
Y2
X1
X2
X1
Y1
Y2
X2
X0
Y0
g
Содержание easy800
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Страница 336: ...10 Diagnostics possibilities 10 4 Transistor output 332 Control Relay easy800 11 11 MN04902001Z EN www eaton com...