A.2 Temperature Control and Communication with COMLI Appendix A: Application Examples
220 493-0736-11 (6-2)
A.2 Temperature Control and Communication
with COMLI
Description
This example describes a control loop for temperature control of a medium which
is heated by a hot water heat exchanger.
Definition of the Control Problem
The object is to regulate the temperature of one medium by controlling the flow
of another. The temperature controller communicates with a host computer or a
control system via COMLI.
The hot water pump is started and stopped from the computer via a digital signal.
When the pump is running it sends a digital acknowledge signal.
The flow of the heated medium is measured by the flow transmitter FT1which
produces an analogue signal. The temperature of the medium is measured via the
temperature transmitter TT1 which also produces an analogue signal.
The computer sets the set point for the controller and registers the temperature on
the outgoing heated medium via the COMLI communication.
Figure 3 Example of Temperature Control with COMLI
Communication
Hot
Water
Heated Media
Heat Exchanger
TICA
1
TT1
FT1
TV1
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