Siemens Module B3 manual Proportional Controlled System with n Time Delays

Page 16

Automation and Drives - SCE

2.5.4 Proportional Controlled System with n Time Delays

The controlled system is called P-Tn system for short.

The time response is described with a differential equation of the nth degree.

The characteristic of the step response is similar to that of the P-T2 system. The time response is described through Tu and Tg.

Substitute: The controlled system with many delays can be approximately substituted with the series connection of a P-T1 system with a dead time system.

The following applies: Tt » Tu and TS » Tg.

Substitute step response for the P-Tn system

 

Preface

Fundamentals

Discontinuous Action Controller Controller Block (S)FB41

Setting the System Appendix

 

 

 

 

 

 

 

T I A Training Document

Page 16 of 64

Module

 

 

 

 

B3

Issued: 02/2008

 

 

Control Engineering with STEP 7

Image 16
Contents Module B3 Automation and Drives SCE Table of Contents Automation and Drives SCE To 3 days Module C To 3 days Module D Frequency Converter at Simatic S7Learning Objective PrerequisitesHardware and software required PLCFundamentals of Control Engineering Tasks of Control EngineeringControlled Variable Components of a Control LoopFeedback Variable r Disturbance Variable z Setpoint Value wComparing Element Controlling ElementControlled System ActuatorDead Time Characteristics For Step Function for Examining Controlled SystemsAutomation and Drives SCE Proportional Controlled System with a Time Delay Time constantTu Delay time Tg Transition time Proportional Controlled System with Two Time DelaysControllability of P-Tn systems Proportional Controlled System with n Time Delays Controlled Systems without Inherent Regulation Types of Controllers Two Position Controllers Switch-On Value Manipulated Variable Time HysteresisThree Position Controllers Basic Types of Continuous Controllers Proportional Controllers P-Controller Automation and Drives SCE With Integral Action Controllers I- ControllerPI Controllers Controller LayoutDerivative Action Controllers D-Controller PID ControllersObjectives for Controller Adjustment 450.85 Digital Controllers DAC Preface Fundamentals Structogram YESAssignment List Symbol Address Comment ExercisePossible Solution for the PLC Program NetworkD24/AIFillSetpNorm/Norm.value for level setpoint Network 10 Title Task Definition for PID Standard Controller Function Diagram of the control system with a PID controller Use FB 41 ContcDescription Exercise Example Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE SP INT PLC’ Automation and Drives SCE Automation and Drives SCE Automation and Drives SCE Tu-TgApproximation GeneralT g Approximation Setting the PI-Controller according to Ziegler-Nichols For setpoint characteristic MAN Solution of the PLC program Setting the PI controller according to Ziegler-Nichols SetpointDiagram of the controller block AppendixInput Parameters Data Value Range Default Description Type Comrst Bool FalseParameter Data Type Value Range Default Lmnhlm Real Lmnllm Parameter Data Value Range Default Description Type Output Parameters