Burkert Type 1110 - Handbuch (Seite 24)

22 - 1110
DIGITAL INDUSTRIAL CONTROLLER
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Figure 12: Ratio controller structure
See Page 25 ff for a description of the function blocks
The ratio controller structure highlighted in Figure 12 is obtained by appropriately
configuring the overall structure. It is based on PID controller 2. PID controller 1 is
not used. Input 1 is used for the control variable PV1 and the process variable PV2
is applied to input 2. SP1 is the ratio setpoint that has to be set.
5.5.2 Ratio controller structure
Filter 1
Input 1
PV1
Linearisation
Ramp
SP1
Setpoint
limiting
Multiplier
SP
Alarm rel.
Arel
Alarm ratio
Averh
Alarm abs.
Aabs
Controller 2
COs
Line of action
CO
Manipulated
variable limiting
SP2
Controller 1
CO2
Filter 2 Root extraction Scaling
Input 2
PV2
ext.SP
ratio
cascade
Feed forward off
Feed forward
control
PDT1
RA
CO1
Root extraction Scaling
Line of action Manipulated
variable limiting
Continuous
signal
Controller
output
2-point-
PWM signal
3-point-
PWM signal
3-point-
step signal
3-point-step
signal with
ext. p. a.
PV1
28
15
27
9
8
16
17
18
19
12
21
26
25 24 23
29 20
22
11 10
14
13
5
6
2 1 3
4
7