Siemens SIPART DR20

SIPART DR20 Project Planning Manual
•
S1 = 6 Synchronization controller without local/remote switchover
(Fig.3/14)
In the case of synchronization control, a common command variable is applied to several control
loops. The command variable can be shifted by the constant c1 and apportioned with the factor c2
in each controller individually.
x1
w
a
w
e
T
w
00 00
S20, S21
Display
Key
8
888
8884
W
Xd
0
2
1
S23
A2
A1
a1 a2
S17
A
A
01
+
-
X
S22
D - element
c1 + c2 ∗ w
c2
c1
w
E
SES
Fig. 3/14 Processing of command variable and formation of negative deviation in synchronization
controller
• S1 = 7 Ratio controller (Fig. 3/15)
In a ratio controller the command process variable x2 is weighted by the ratio factor v and forms
the setpoint for the controlled process variable x1 :
w = v ∗ x2
When xd = w - x then xd = v ∗ x2 - x 1
With xd = 0 this results in v = x1/x2, i.e. in the settled state x1/x2 corresponds to the ratio factor v.
A basic value (parameter c1) can be applied in addition:
w = v ∗ x2 + c1
In the settled state:
x1 = v ∗ x2 + c1
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