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Chapter 13

Chapter 13. Understanding Relay Instructions and the Programmable Controller Input Modules. Objectives. Explain proper programming of normal closed and normally open PLC input signals. Describe hardware relay operation and its correlation to proper PLC interface and programming.

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Chapter 13

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  1. Chapter 13 Understanding Relay Instructions and the Programmable Controller Input Modules

  2. Objectives • Explain proper programming of normal closed and normally open PLC input signals. • Describe hardware relay operation and its correlation to proper PLC interface and programming. • Convert a conventional start-stop schematic to a PLC ladder rung diagram.

  3. Objectives (cont’d.) • Explain why PLC ladder logic for motor starter interface has an additional contact in comparison to a conventional schematic. • Hook up a start-stop station to a PLC input module. • Hook up and develop a PLC program to correctly control a motor starter.

  4. Typical Hard-Wired Start-Stop Latching Circuit

  5. Incorrect Conversion of Conventional Start-Stop Schematic to PLC Control

  6. Normally Open Push Button and Non-Energized Relay

  7. Normally Open Push Button Energizing Relay Coil and Pilot Light B

  8. Normally Closed Push Button Energizing Relay Coil and Pilot Light B

  9. Normally Closed Stop Push Button Depressed

  10. Relay Status in Conjunction with Input Push Buttons

  11. Input and Output Separation

  12. Separated Inputs Connected to PLC Input Screw Terminals

  13. Start Push-Button Status Reflected in the Input Status Table

  14. Start-Stop Input Bit Status from Input Hardware in a Non-Energized State

  15. Normally Open Push Button Not Activated

  16. Normally Open Push Button Input Pressed

  17. Normally Closed Input Push Button

  18. Normally Closed Push Button Input to PLC

  19. Push Button Released Output Latched through CR 1-1

  20. Conventional Schematic Start-Stop Logic

  21. Conventional Motor Starter Schematic Diagram

  22. Conventional Motor Starter Circuit Converted for PLC System Management

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