Sensor and Logic

Photoelectric Sensor

Place the sensor in front of the door. You may have to try out different placements until you find one that is close enough to the door for the products to pass through. The sensor reacts when an element enters its view, represented by a yellow rod. It then activates and sends a 24V current through its signal port. It is powered by two ports, x1 and x2, that has to be connected to the DC power supply.


We use a motor contactor as an intermediary between the sensor and the motor. The contactor has five inputs and three outputs as shown here. The inputs are the three phases, I1_in … I3_in, and the ports x11 and x12 used to control the current flow. 


The input is routed to the outputs , I1_out … I3_out, depending on the control current on the ports x11 and x12, where x11 is connected to the signal port on the sensor. When the signal activates, the motor contactor delivers power to the motor.

Breakdown of the steps in the model:

  • The product hits the sensor.

  • The sensor port signal outputs 24V

  • The motor contactor reacts on the control signal and routes its input power to the output power.

  • The engine receives power via the motor contactor and opens the door.