Plant Control System Training

565-01 Distributed Control System Fundamentals

When you complete this lesson, you will be able to describe the design and function of a typical distributed control system (DCS).

  • Describe the functions of a typical distributed control system (DCS)
  • List and briefly describe the main components or elements of a DCS
  • Explain the use of a remote control panel in the DCS
  • Discuss communications mediums available for use in DCS; list advantages and disadvantages of each choice
  • Describe the purpose of a central control facility (control room) associated with a DCS
  • Describe the functions of the human machine interface (HMI)
  • Discuss the reasons for different levels of authority on various HMI stations
  • Identify the functions of control, interface, and database software associated with DCS

565-02 Distributed Control System Components

When you complete this lesson, you will be able to list the components associated with a common distributed control system (DCS) and describe their functions.

  • List and briefly describe plant instrumentation used to collect system parameter and equipment data to be used in a DCS
  • Describe the general design and function of the following DCS components:
    • Instrumentation
    • Transmitters and input/output modules
    • Processors
    • Multiplexers
    • Electrical/computer buses
    • Human-machine interface
    • ­­­Control devices/actuators
  • Discuss the flow of information through the DCS and describe how that information is used to monitor and control power plant systems, parameters, and equipment

565-03 Using Distributed Control System Diagrams

When you complete this lesson, you will be able to describe the basic symbols and parts of a logic diagram. You will also be able to explain how to use a DCS logic diagram as a troubleshooting tool.

  • Identify basic logic symbols used in logic diagrams
  • List the parts of a drawing title block
  • Explain the purpose of a drawing legend
  • Discuss permissives and interlocks associated with control systems
  • Describe how a control loop maintains a parameter at its control setpoint
  • Discuss the use of trip setpoints
  • Describe how the feedback function in a control loop helps keep processes stable
  • Describe trim and bias control logic features
  • Discuss general troubleshooting steps and techniques

565-04 Power Plant Unit Control

When you complete this lesson, you will be able to describe the basic design and function of a boiler-following instrumentation and control system.

  • Discuss the basic operation of a boiler-following distributive control system (DCS)
  • Explain how changing power plant load affects steam temperature, pressure, and flow
  • Describe how the DCS maintains parameters at their designed values when unit load changes
  • Discuss the relationship between the following:
    • Fuel flow and associated unit parameters
    • Fuel flow, furnace draft, air flow, and excess oxygen
    • Feedwater flow, steam flow, unit load, and boiler drum level
  • Identify operator responsibilities in controlling key operating parameters, systems, and equipment during normal operation