Allen-Bradley Micro800 General Instructions Manual page 586

Programmable controllers

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Table of Contents

Proportional Integral Derivative (PID) instruction

Function block

IPIDController function block

PID_OutputRegulator UDFB

PID_Feedback UDFB

PID_PWM UDFB

SIM_WATERLVL UDFB

Function blocks and UDFBs used in the water level FBD

This application, developed in the Function Block Diagram (FBD) language, uses

the function blocks described in the following table.

Provides PID process control

Regulates the output of the IPIDCONTROLLER within a safe range to ensure the hardware used in the process is not

Sample code:

IF RMIN ≤ RIN ≤ RMAX, then ROUT = RIN,

IF RIN < RMIN, then ROUT = RMIN,

IF RIN > RMAX, then ROUT = RMAX

Acts as a multiplexer

Sample code:

IF "FB_RST" is false, FB_OUT=FB_IN;

If "FB_RST" is true, then FB_OUT=FB_PREVAL.

Provides a PWM function, converting a real value to a time related ON/OFF output

Simulates the process in the application example

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