Operation Liquiline System CA80SI
94 Endress+Hauser
Menu/Setup/Additional functions/Controller 1 ... 2
Function Options Info
Control Selection
• Off
• Automatic
• Manual mode
Factory setting
Off
‣
First configure the controller and leave the
switch at the factory setting (Off).
Once you have made all the settings, you can
assign the controller to an output and switch it
on.
Manual mode
y -100 to 100 %
Factory setting
0 %
‣
Specify the manipulated variable that should
be output in manual mode.
y Actual output Read only Manipulated variable actually output.
Setpoint Current set point
x Current measured value
Disturbance variable Current measured value of disturbance variable
Norm. disturb. value
Name Free text
‣
Give the controller a name so you can
identify it later on.
Controller Enable Selection
• None
• Binary inputs
• Limit contactors
• Fieldbus variables
Factory setting
None
In connection with the DIO module, you can
select a binary input signal, e.g. from an
inductive proximity switch, as a source for
enabling the controller.
Setup Level Selection
• Standard
• Advanced
Factory setting
Standard
Changes the number of parameters that can be
configured. → Parameters → 98
Standard: If you choose this, the other controller
parameters are active nevertheless. The factory
settings are used. These suffice in most cases.
Process type Selection
• Inline
• Batch
Factory setting
Inline
‣
Decide what type of process best describes
your particular process.
Batch process
The medium is in a closed system.
The task of the control system is to dose in such a way that the measured value (controlled variable) changes
from its start value to its target value. No more dosing is needed once the set point has been reached and the
system is stable. If the target value is overshot, a two-sided control system can compensate for this. In the case
of 2-sided batch control systems, a neutral zone is used/configured to suppress oscillations around the set
point.
In-line process
In an in-line process, the control system works with the medium flowing by in the process.
Here, the controller has the task of using the manipulated variable to set a mixture ratio between the medium
and dosing agent such that the resulting measured variable corresponds to the set point. The properties and
volume of the medium flow can change at any time and the controller has to react to these changes on a
continuous basis. If the flow rate and medium remain constant, the manipulated variable can also assume a
fixed value once the process has settled. Since the control process is never "finished" here, this type of control is
also referred to as continuous control.
A mixture of both process types can often be found in practice: the semi‐batch process. Depending on the
ratio between the flow and the container volume, this arrangement behaves either like a batch process or
an in-line process.
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