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Structured approach in PLC (programmable logic controller) programming for water/wastewater applications.

P Y Keskar

    ISA Transactions
    |January 1, 1990
    PubMed
    Summary
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    This study presents a structured PLC programming methodology for water/wastewater systems, using standardized templates for efficient implementation and improved operability. This approach enhances system reliability and simplifies maintenance.

    Area of Science:

    • Automation and Control Systems
    • Water Resource Management
    • Industrial Computing

    Background:

    • Programmable Logic Controllers (PLCs) are crucial for automating water and wastewater processes.
    • Integrating PLCs with supervisory host computers and human-machine interfaces (HMIs) presents programming challenges.
    • Efficient and standardized PLC logic is essential for reliable system operation.

    Purpose of the Study:

    • To develop and describe an efficient methodology for PLC programming in water/wastewater applications.
    • To create standardized PLC logic templates for common control functions.
    • To facilitate easier implementation, debugging, and maintenance of PLC-based control systems.

    Main Methods:

    • Development of standardized PLC network "templates" for various functions including pump controls, PID control, alarms, motor run times, signal conversion, and flow totalization.

    Related Experiment Videos

  • Interfacing PLCs with a supervisory host computer utilizing touch screen monitors for operator interaction.
  • Designing PLC ladder logic to process both hardwired inputs/outputs (I/O) and data exchanged via a communication link with the host system.

    • Main Results:

    • Successful implementation of a structured PLC programming approach using standardized templates.
    • Demonstrated efficiency in system implementation, debugging, and start-up.
    • Achieved uniform and easily readable PLC ladder logic across different control modules.

    Conclusions:

    • The developed methodology provides an efficient and reliable framework for PLC programming in water/wastewater treatment facilities.
    • Standardized templates significantly reduce development time and improve the maintainability of control systems.
    • This structured approach enhances the overall performance and operational consistency of automated water/wastewater systems.