17 function library – Lenze 8400 HighLine User Manual
Page 1324
17
Function library
17.1
Function blocks
1324
Lenze · 8400 HighLine · Referenzhandbuch · DMS 10.0 EN · 06/2014 · TD05/TD14
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Selecting the characteristic
The max. 32 interpolation points of the characteristic are selected via the subcodes of
and
.
• The values are to be set as raw values (±16384 ≡ ±100 %).
• The same subcodes of
and
correspond to one pair of variates/interpolation
point (x
n
, y
n
).
• The first pair of variates (
C00963/1
and
) 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 %).
Special cases
• Step changes/discontinuities can be displayed by using the same parameter setting for two
consecutive X values. A step change is only valid if it has a valid pair of variates. Otherwise,
extrapolation continues, starting at the last valid pair of variates.
[17-23] Example: Characteristic with step change
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
-22938
(-140 %)
-14746
(-90 %)
11469
(70 %)
23757
(145 %)
0
0
0
0
0
Y
-22938
(-140 %)
-6554
(-40 %)
18842
(115 %)
26215
(160 %)
0
0
0
0
0
1
2
3
4
5
6
7
...
32
X
-21300
(-130 %)
-11469
(-70 %)
-11469
(-70 %)
13107
(80 %)
0
0
0
0
0
Y
-24576
(-150 %)
-12288
(-75 %)
13927
(85 %)
26215
(160 %)
0
0
0
0
0
nOut_a
nIn_a
X1, Y1
X3, Y3
X4, Y4
-199.99 % / -199.99 %
199.99 % / 199.99 %
X2, Y2