West Control Solutions KS98-1 - Manual (Page 94)

III-1.7 EEXP (e-function (No. 11))
y e
x
1
1 =
The e-function is calculated.
If input signal
x1 is higher than 85, there may be an overflow. In this case, y1 = 1,5
w
10 37 is output rather than
forming the power.
If x1 is not wired, this is interpreted as x1 = 0 and thus as y1 = 1.
g
Note:
EEXP is the reversal function of function LN.
Examples:
With an input value of x1 = 5, output value y1 = 148,413159.
With an input value of x1 = 0,69314718, output value y1 = 2.
III-1.8 LN (natural logarithm (No. 12))
y x
1
ln 1) = (
The natural logarithm of input variable x1 is formed.
The basis of natural logarithms is constant e (2,71828182845904).
If
x1 is not wired, this is interpreted as x1 = 1. In this case y1 is 0.
With a negative input variable x1, y1 = -1,5
w
10 37 is set.
g
Note:
LN is the reversal function of function EEXP.
Examples:
The result of input value
x1 = 63 is an output value of y1 = 4,143134726.
The result of input value x1 = 2,71828182845904 is an output value of y1 = 1.
Scaling and calculating functions 9499-040-82711
III-94 EEXP (e-function (No. 11))
x1 y1
e x1
x1 y1
ln