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Asociado certificado

PL-700-3 - PID control using programmable controllers/PLCs


Description

In the early days, programmable controllers were used for sequential functions. Increasingly they are used for PID control. PLCs offer specific characteristics that require sound knowledge to ensure proper strategic functioning of PID control. For example, the addition of a simple filter to the inlet variable of a PID controller requires a much different approach when compared to an independent controller or DCS system. An adequate filter is usually essential to reliable process control and must be used.
Objectives

The PLC, used in the past mostly for sequential tasks, is now used more and more for PID control. To assure perfect functioning of strategies, sound knowledge of the PLC is mandatory. For example, the addition of a filter to a PID controller in a PLC is much more complex compared to a single-loop controller or a DCS system. Our experience with the most popular industrial PLCs permits us to offer a course that gives you the programming knowledge necessary for implementing effective control strategies on a PLC.
Who should attend

This course is designed for anyone involved in programming control algorithms of PLC, in process automation, and in PID controller tuning.
Schedule

From 8:30 am to noon and from 1:00 pm to 4:30 pm

Each day
Content

Day 1 : Introduction

Introduction
  • Control loops
  • Noise, disturbances, load
  • Tuning objectives
Process
  • Simple model
  • How to choose a model
  • Types of processes
  • Process flaws
  • Natural frequencies
  • Exercises
Controllers
  • Proportional
  • Integral
  • Derivative
  • Filter, units and the effects of each
  • Exercises


Day 2 : Features of the PLC

Sampling
  • Problems with sampling
  • Sampling time
  • Aliasing
  • Exercises
Sampling effects
  • Equivalent dead time
  • If the sampling time varies
  • A/D conversion problems
PID controller features
  • Algorithms
  • PID parameter units
  • Engineering units
  • Sampling time, initiation
  • Integrers and real numbers
  • Direct and inverse action
  • Transfer between manual and auto M / A and A / M
  • Numerical values and addresses
  • Exercises
Problematic functions
  • Limit values
  • Overflow
  • Derivative filter
  • Anti reset wind-up
  • Filtering
  • Default values
  • Exercises
Special features
  • Dead band
  • External reset
  • Feedfoward
  • Rate of change limit
  • Moving average
  • Others
  • Exercises


Day 3 : Solutions

Sampling time
  • Choice of sampling time
  • Initiation method : interrupt, timer, other methods
  • Precision of sampling interval
  • Exercises
Reading of analog signals
  • Synchronous and asynchronous
  • Sampling time
  • Exercises
Choice of algorithms
  • Available models
  • Advantages, disadvantages
  • Default values
  • Exercises
First order filter programming
  • Simple case-study
  • Universal equation
  • Moving average comparison
  • Exercises
Known errors
  • Algorithm errors
  • Values for wrong default
  • Transfer between auto and manual M/A and A/M
  • Manufacturer's suggestions
Link with operating interface (supervisory software)
  • Common errors
  • Operator limitations
  • Suspicious programming
  • Controller setpoint manipulation

Software used

ExperTune (latest revision)