Chapter - Logical Sensors Sinking/Sourcing - Switches current on or off. Plain Switches - Switches voltage on or off. Solid State Relays - These switch.

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Presentation transcript:

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

Switched outputs (e.g. Relays)

Sourcing (supplies voltage/current)

Sinking (to the common)

Wiring

A PLC Input Card For a Sinking (NPN) Sensor

PLC Input card for Sourcing (PNP) sensors

Symbols and Wiring Conventions

Photo-optical sensors

Photo-optic - Opposed mode

Photo-optic - retroreflective

Photo-optic - Diffuse

Photo-optic alignment and beam size

Photo-optics - focussed

Optical Properties

Capacitive Sensors

Relative Capacitive Values

Inductive sensors

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

Sensor tradeoffs Material Distance Accuracy …..

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