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Chapter - Logical Sensors

Chapter - Logical Sensors. Sensor output types. Sinking/Sourcing - Switches current on or off. Plain Switches - Switches voltage on or off. Solid State Relays - These switch AC outputs. TTL (Transistor Transistor Logic) - Uses 0V and 5V. Switched outputs (e.g. Relays).

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Chapter - Logical Sensors

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  1. Chapter - Logical Sensors Sensor output types • Sinking/Sourcing - Switches current on or off. • Plain Switches - Switches voltage on or off. • Solid State Relays - These switch AC outputs. • TTL (Transistor Transistor Logic) - Uses 0V and 5V.

  2. Switched outputs (e.g. Relays)

  3. Sourcing (supplies voltage/current)

  4. Sinking (to the common)

  5. Wiring

  6. A PLC Input Card For a Sinking (NPN) Sensor

  7. PLC Input card for Sourcing (PNP) sensors

  8. Symbols and Wiring Conventions

  9. Photo-optical sensors

  10. Photo-optic - Opposed mode

  11. Photo-optic - retroreflective

  12. Photo-optic - Diffuse

  13. Photo-optic alignment and beam size

  14. Photo-optics - focussed

  15. Optical Properties

  16. Capacitive Sensors

  17. Relative Capacitive Values

  18. Inductive sensors

  19. Other sensor types Reed switches Hall effect switches Fluid flow Etc….

  20. Sensor tradeoffs Material Distance Accuracy …..

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