Sfct' Setpoint Function; Sl0 - Siemens SIPART PS2 Series Operating Instructions Manual

8.4.2.5

'12.SFCT' Setpoint function

Possible settings:
Purpose:
Factory setting:
Seven process valve characteristics are stored in the positioner and are selected using the
'SFCT' parameter:
Process valve characteristic
Linear
Equal percentage
Equal percentage
Equal percentage
Inverse equal percentage
Inverse equal percentage
Inverse equal percentage
Freely adjustable
8.4.2.6 '13.SL0' ... '33.SL20' Setpoint turning point
Setting range:
Purpose:
Factory setting:
SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE
● Lin
● 1 - 25
● 1 - 33
● 1 - 50
● n1 - 25
● n1 - 33
● n1 - 50
● FrEE
This parameter is used to linearize nonlinear process valve char‐
acteristics. Optional flow characteristics as shown in the figure in
the '13.SL0' ... '33.SL20' Setpoint turning point (Page 149) param‐
eter description are simulated for linear process valve characteris‐
tics.
Lin
1:25
1:33
1:50
25:1
33:1
50:1
0.0 ... 100.0
These parameters are used to assign a flow coefficient in units of
5% to each setpoint turning point. The setpoint breakpoints form a
polyline with 20 linear segments which models the process valve
characteristic; see figure below.
"0", "5" ... "95", "100"
Parameter assignment
8.4 Description of parameters
Set with parameter value
Lin
1-25
1-33
1-50
n1-25
n1-33
n1-50
FrEE
149