Proportional Integral Derivative (PID) instruction Chapter 20
Rockwell Automation Publication 2080-RM001D-EN-E - February 2015 581
Temperature control system
The following diagram shows the components in the temperature control system
that are controlled by the temperature control program. The table following the
diagram describes the events that occur when the control program runs.
Sequence of events for temperature control program
The following table identifies the components in the temperature control system
and describes, in sequence, the events that occur in the system when the
temperature control program runs.
No Item Description
Controller output Sends the MV to the PWM (On/Off).
Pulse Width Modulation (PWM temperature controller Solid state relay that controls the heating element.
Heating element Increases temperature in the control zone.
Resistance temperature detector (RTD) Measures the temperature in the control zone and sends the PV (RTD signal) to the controller input.
Controller input Receives the PV (RTD signal).
PLC program Converts the PV (RTD signal) to the same unit as the SP (degrees Celsius) and determines the difference
between the PV and the SP and adjusts the MV according to the parameter values defined in the P, I and D
parameters.
To Next Page
Loading...
