Chapter 20 Proportional Integral Derivative (PID) instruction
580 Rockwell Automation Publication 2080-RM001D-EN-E - February 2015
Convert a manipulated value to a digital output
This UDFB converts a manipulated value (MV) to a digital output (DO) so it can
be used to control a digital input n(DI).
Converting a manipulated value to an analog output
This UDFB converts a manipulated value (MV) to an analog output (AO) so it
can be used to control an analog input (AI).
Example: How to create an IPIDController program to control
temperature
The temperature control program maintains the temperature within the control
zone.
Setpoint, process and manipulated values
The following table defines how the SP, PV, and MV values are used in the
temperature control program.
Item Description
Setpoint (SP) Measurement of temperature in degrees Celsius that defines the temperature for the control zone.
Process value (PV) Must be converted to the same unit as the SP, which is a measurement of degrees Celsius.
Manipulated value (MV) Must be converted to an analog value so it can be output to the PWM to control the heating element.
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