Example: How To Create An Ipidcontroller Program To Control Temperature - Allen-Bradley Micro800 General Instructions Manual

Programmable controllers

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Table of Contents

Proportional Integral Derivative (PID) instruction

Setpoint (SP)

Process value (PV)

Manipulated value (MV)

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

The temperature control program maintains the temperature within the control

Setpoint, process and manipulated values

The following table defines how the SP, PV, and MV values are used in the

temperature control program.

Measurement of temperature in degrees Celsius that defines the temperature for the control zone.

Must be converted to the same unit as the SP, which is a measurement of degrees Celsius.

Must be converted to an analog value so it can be output to the PWM to control the heating element.

Rockwell Automation Publication 2080-RM001D-EN-E - February 2015