1. Chapter - Logical Sensors 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. Sensor output types

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 …..