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Understanding PLCs: Cost-Effective Control Systems for Industrial Designs

Explore the advantages of PLCs, how they originated as relay replacements, and their use in industrial control designs. Learn about logical control with relays, ladder logic, SFCs, structured text, and the stages of a PLC scan. Discover how PLCs offer cost-effective, flexible, and reliable solutions for complex systems.

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Understanding PLCs: Cost-Effective Control Systems for Industrial Designs

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  1. CHAPTER - INTRODUCTION TO PLCS Advantages of PLCs • Cost effective for controlling complex systems. • Flexible and can be reapplied to control other systems quickly and easily. • Computational abilities allow more sophisticated control. • Trouble shooting aids make programming easier and reduce downtime. • Reliable components make these likely to operate for years before failure.

  2. PLC Origin - Developed to replace relays in the late 1960s - Costs dropped and became popular by 1980s - Now used in many industrial designs

  3. Relays and Schematic Symbols

  4. Logical Control with Relays

  5. Relay Logic In a PLC

  6. Reading Ladder Logic

  7. A Ladder Logic Example

  8. Mnemonics

  9. SFCs

  10. Structured Text

  11. PLC in a Control Loop

  12. The Four Stages of a PLC Scan

  13. Ladder Logic Inputs

  14. Ladder Logic Outputs

  15. Sample Problem: Try to develop (without looking at the solution) a relay based controller that will allow three switches in a room to control a single light.

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