Dc photoelectric sensors detect the presence or absence of light. When outputs turn on, power flows through the load. When turned off, the load receives no power. The remaining two modes of operation ...

Some photoelectric sensors, ultrasonic sensors, and rotary encoders generate a digital dc output called a push-pull signal. The external environment activates the sensor, which, in turn, closes a ...

Matching a sensor interface with a programmable logic converter or controller hardware that can accept only one type of input—npn or pnp—can be difficult. The last-stage modification circuit described ...