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Sensors
  Photoelectric Sensor Technology
    Light Source
      LED
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        Specular Reflective
    Beam Operation
      Through Beam
        Wave Guide
          Rigid Wave Guides
      Retro Reflective
        Fan Beam Scanner
      Proximity
        Convergent
  Conductive
  RF (electromagnetic)
  Impact
  Surge

Controllers
  Switching Controllers
    Output
      Electromechanical Relay
      Solid-State AC Switch
      Transistor Logic
        Open Collector
        Current Sink Or Source
    Control Function
      On Off
        Automatic On Off
      Latch
      Counter
        Batch Counter
        Toggle Batch Counter
      Shift Register
        Delay Line
        Externally Clocked Shift
      Time Delay
        Signal Loss Hold
        Energize Hold
          One Shot
          Delayed One Shot
          Repeat Cycle Timer
      Over Or Under Speed
  Analog

Configuration
  Self Contained
    Modular
  Wiring
    Two Wire Ac
      Compact Series Two Wire Ac
    Five Wire Relay
      Five Wire Ac Relay
      Five Wire Dc Relay
    Eight Wire Relay
    Three Wire Transistor Logic
  Remotely Operated
    Enclosure
      NEMA-1
      NEMA-12
  Potted
    Full Potted
    Potted Cable

[Include all three wire transistor logic technology information on a single page?]

Three Wire Transistor Logic

DC output transistor-logic provides a common shield wire which should be connected to the negative supply voltage, and a positive wire for the positive supply voltage.

Loads are connected between a third wire (negative side) and the positive supply voltage.