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Advantages of PLCs

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.

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Advantages of PLCs

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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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