Fb 58 "Tcont_Cp - Siemens SIMATIC Manual

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FB 58 "TCONT_CP"

FB 58 "TCONT_CP" is used to control temperature processes with continuous or
pulsed control signals. You can set parameters to enable or disable subfunctions of
the PID controller and adapt it to the process. These settings can be made simply
with the parameter assignment tool. You start this within a project by double-
clicking on the instance DB in the SIMATIC Manager. You can open the electronic
manual as follows:
Start > Simatic > Documentation > English > PID Temperature Control.
Application
The functionality is based on the PID control algorithm with additional functions for
temperature processes. The controller supplies analog manipulated values and
pulse-duration modulated actuating signals. The controller outputs signals to one
actuator; in other words, with one controller, you can either heat or cool but not
both.
Using the Controller in a Heating or Cooling Process
FB TCONT_CP can be used either purely for heating or purely for cooling. If you
use the block for cooling, GAIN must be assigned a negative value. This inversion
of the controller means that, for example if the temperature rises, the manipulated
variable LMN and with it the cooling effort is increased.
Outline of the Structure
Setpoint
SP_INT
Process value
PV_PER
PV_IN
PID Temperature Control
A5E00125039-02
PID Temperature controller
•
Control zone
Improved
control response
Controller tuning
PI/PID parameters
•
Control zone width
Sampling time
Actuating signal
Pulse generator
QPULSE
Manipulated variable
LMN
Introduction
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