8400 HighLine | Parameter setting & configuration
Function library
Function blocks | L_Curve_1
942 L Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010
14.1.54.2 Function 3: nOut_a = f(table)
If function 3 has been selected in C00960
, the output value is calculated according to a
characteristic.
The characteristic may comprise up to 32 interpolation points which are defined by
parameters.
If the nIn_a input value is equal to one of the X interpolation points, the corresponding
Y interpolation point will be output to nOut_a.
If the nIn_a input value lies between two X interpolation points, the nOut_a output
value will be interpolated linearly:
[14-22] Linear interpolation between two interpolation points
Selecting the characteristic
The max. 32 interpolation points of the characteristic are selected via the subcodes of
C00963
and C00964.
The same subcodes of C00963
and C00964 correspond to one pair of variates/
interpolation point (x
n
, y
n
).
The first pair of variates (C00963/1
and C00964/1) is always valid.
The X values of the characteristic must be entered in ascending order
(x1<x2<…<x32).
An interruption of the ascending order of the X values represents the end of the
characteristic (in our example: x5 < x4):
Starting at the last valid pairs of variates, extrapolation is performed on both sides until
the end of the X value range (±199.99 %).
As per the equation,
output value nOut_a for nIn_a is calculated as follows:
nOut_a
nIn_a
x
n
x
n+1
y
n
y
n+1
y
n+1
-y
n
x
n+1
-x
n
y
x
x
n+1
x
n
–
y
n+1
y
n
–
-----------------------
nIn_a x
n
–
nOut_a y
n
–
-------------------------------=
nOut_a
nIn_a x
n
–()y
n+1
y
n
–()⋅
x
n+1
x
n
–
---------------------------------------------------------------- y
n
+=
1 2 ... 32
X C00963/1 C00963/2 C00963/... C00963/32
y C00964/1 C00964/2 C00964/... C00964/32
1 2 3 4 5 6 7 ... 32
X
-140 % -90 % 70 % 145 % 0 %0 %0 %0 %0 %
y
-140 % -40 % 115 % 160 % 0 % 0 % 0 % 0 % 0 %
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