Siemens PROFIBUS PA SIPART PS2 Manual page 96

Operation
10.SL0 to 30.SL20
x
100%
90
80
70
Setpoint turning point
Example:
15 SL5 = 45.0
60
50
40
30
20
10
0
0
10
1 2
SL 0
Figure 4-8 Setpoint characteristic, manipulated variable standardization and tight closing function
94
Six valve characteristics are stored in the positioner
linear
S
equal percentage
S
equal percentage
S
equal percentage
S
inverse equal percentage
S
inverse equal percentage
S
inverse equal percentage
S
freely adjustable
S
Setpoint turning points
A flow parameter can be assigned to the respective setpoint turning
point at an interval of 5%. These points lead to a polygon chain with 20
straight lines which therefore represents a projection of the valve char-
acteristic.
Limit for
tight closing
Example:
35 YVLS = UP
37YCUP = 95.0
9 SFCT = FrEE
Limit for
tight closing
Example:
35 YCLS = doWn
36 YCDO = 12.5
20 30 40 50
3 4 5 6 8 9
7
(9.SFCT = Lin, factory setting)
1 : 25 (9.SFCT = 1 : 25)
1 : 33 (9.SFCT = 1 : 33)
1 : 50 (9.SFCT = 1 : 50)
25 : 1 (9.SFCT = n1 : 25)
33 : 1 (9.SFCT = n1 : 33)
50 : 1 (9.SFCT = n1 --: 50)
(9.SFCT = FrEE)
9 SFCT = Lin
9 SFCT = 1--50
60 70 80
10 11 12 13 14 15 16 17
w
90 100 %
18 19 20
SIPART PS2 PA Manual
A5E00127926-03