Discrete Position Sensing

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Presentation transcript:

Discrete Position Sensing Mechanical Optical Magnetic

Mechanical Sensing - Microswitch

Microswitch Operation Switch exhibits mechanical hysteresis.

Microswitch Actuators

Optical Sensing LED’s and Photodiodes Transmissive/Reflective Modulated/Unmodulated Light-on/Dark-on Fiber optic

Transmissive & Reflective Sensors

Beam Pattern and Reflectance

Specular Reflection

Modulation “Chop” LED on and off at many kHz rate Bandpass filter after photodiode at the same frequency as chopping Threshold circuit after BPF generates on/off output

Magnetic Position Sensors Reed switches (sense permanent magnet) Inductive proximity sensors (eddy current) Hall Sensors (sense permanent magnet)

Inductive Proximity Sensor

Inductive Proximity Sensors

Hall Sensors Hall effect: constant voltage forces a constant current in semiconductor sheet magnetic field flux lines perpendicular to current cause proportional voltage across sheet. discovered by E.F.Hall in 1879 Linear sensor needs voltage regulator and amplifier Switch also needs threshold circuit, with hysteresis

Total effective air gap (TEAG) Sensitivity, Hysteresis, & Temperature Hall Switch Magnet motion head-on bypass or slide-by Total effective air gap (TEAG) Sensitivity, Hysteresis, & Temperature

The tag indicates that the LOAD (PLC input) has a +DC common Sinking/Sourcing The tag indicates that the LOAD (PLC input) has a +DC common this is a sinking output Sinking output => sourcing input

Sinking/Sourcing Photosensor – comes in either NPN (sinking) or PNP (sourcing)

Terminal Blocks