Endress+Hauser Liquiline CA80SI - Page 83

Liquiline System CA80SI Operation
Endress+Hauser 83
Outputting the controller manipulated variable via the current output
Unipolar+ Assign to the output to which an actuator that can increase the measured value
is connected. Unipolar- Assign to the output to which an actuator that can decrease the
measured value is connected.
To output the manipulated variable of a two-sided controller, positive manipulated
variables and negative manipulated variables generally have to be output to different
actuators, as most actuators are able to influence the process in one direction only (not in
both). For this purpose, the instrument splits the bipolar manipulated variable y into two
unipolar manipulated variables, y+ and y‐.
Only the two unipolar manipulated variable parts are available for selection for outputting
to modulated relays. If outputting the values via a current output, you also have the
possibility of outputting the bipolar manipulated variable y to one current output only
(split range).
11.5.2 Alarm relay and optional relays
The basic version of the device always has one alarm relay. Additional relays are also
available depending on the version of the device.
The following functions can be output via a relay:
• Limit switch status
• Controller manipulated variable for controlling an actuator
• Diagnostic messages
• Status of a cleaning function in order to control a pump or a valve
You can assign a relay to multiple inputs in order to clean several sensors with just
one cleaning unit, for example.
Menu/Setup/Outputs/Alarm relay or relay at channel no.
Function Options Info
Function Selection
• Off
• Limit switch
• Controller
• Diagnostics
• Cleaning
(sensor)
• Analyzer
Factory setting
• Alarm relays:
Diagnostics
• Other relays:
Off
The following functions depend on the option
selected.
These versions are illustrated individually in the
following sections to provide a clearer
understanding of the options.
Function = Off
Switches off the relay function and means no
further settings are required.
Outputting the status of a limit switch
Function = Limit switch
Function Options Info
Source of data Selection
Limit switch 1 ... 8
Factory setting
None
Select the limit switch via which the status of the
relay is to be output.
The limit switches are configured in the menu:
Setup/Additional functions/Limit switches.

Use the softkeys ALL and NONE to select
or deselect all the limit switches in one go.