Control systems design
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Slovak University of Technology Faculty of Material Science and Technology in Trnava. Control Systems Design. 2007. Control Systems Design. Distributed control systems - process control level: Process level Sensors Actuators Programmable controllers Operator interfaces

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Control Systems Design

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Control systems design

Slovak University of Technology

Faculty of Material Science and Technology in Trnava

ControlSystemsDesign

2007


Control systems design1

Control Systems Design

Distributed control systems - process control level:

  • Process level

    • Sensors

    • Actuators

    • Programmable controllers

    • Operator interfaces

    • Lateral communications

    • Vertical communications...


Control systems design2

Control Systems Design

Distributed Control Systems - Upper Control Level:

  • Operator level

    • operator displays

    • on line control process monitoring

    • operator process control

    • process data acquisition

    • process data history trends aggregation ...


Control systems design

The process level provides the primary functions of a control system:

  • Acquisition and primary processing of continuous and binary technological variables

  • Control action computation according given algorthms of continuous or logical control

  • Realization of computed control action

  • Alarm generation under abnormal, special events in controlled system or control one as well


Control systems design

The process level provides the primary functions of a control system (continued):

  • Fault operation blocking of control system and control system transition into safety state

  • Selfdiagnostic of control system hardware

  • secondary proccesing of analog and binary technological variables used on upper level control

  • horizontal and vertical communication of distributed control systems units...


Control systems design

The operator level is usually configured for the functions:

  • controlled technological process monitoring

  • control process visualisation

  • alarms processing

  • on line trends generating

  • off line historical trends archiving and historical data presentation

  • for higher control system level data aggregation.


Control systems design

The design of control systems is

a complex problem:

  • process level distributed control systems design with programmable controllers

  • control process monitoring design

  • operator interface design (HMI/MMI)

  • SCADA system design

  • Real time Database design...


Control systems design

The scope of the DCS course

  • Process Level - Control Loop - SW life cycle:

    • I/O analogue and binary variable acquisition and primary processing

    • Control action executing

    • Alarms/events processing and managing.

    • The scope of the course Control System Design is specified as follows:

    • Data processing design

    • Control loop design

    • Design process documentation


Control systems design

The scope of the DCS course

  • Data processing design

  • Control loop design

  • Design process documentation

  • Key words

    • User Requirements Specification

    • Functional Specification

    • HW / SW design

    • Documentation Specification


  • Control systems design

    Control Loop Design

    • Single Control Loop

    • Cascade Control Loop

      • master /Slave control loops

  • Ratio Control

    • set point programming

    • mixture technology

  • Feed Forward Control

    • on a disturbance

    • on a set point


  • Control systems design

    Control Loop Design consists of steps:

    • Dynamic system model identification

    • Dynamic process simulation

    • Control parameter optimisation

    • Control process simulation

    • Control loop stability verification

    • Control loop performance verification


    Control systems design

    Life Cycle Documentation

    • User Requirements Specification

    • Functional Specification

    • Hardware Specification

    • Software Specification

    • Test planning – control system verification, control system validation, FAT, SAT

    • Operator&System manuals

    • Control system maintenance documentation


    Control systems design

    The Course Scope

    • User Requirements Specification

      • what should to do

    • Functional Specification

      • what will to do

    • Process Model Identification

      • transfer function

    • Control Parameters Optimisation

      • P, PI, PD, PIDA, PIDB...

    • Control Process Simulation

      • control process verification


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