Panasonic Light curtain/area sensor NPN - Open Collector

The term "NPN - Open Collector" refers to the output configuration of Panasonic light curtains or area sensors. Let's break down what each part of this specification means: NPN (Negative-Positive-Negative): This refers to the transistor type used in the output stage of the sensor. NPN transistors are commonly used in industrial automation applications. In the context of a light curtain or area sensor, the NPN output means that the sensor's output is active when it sinks current to the negative supply (ground) and becomes inactive when it does not sink current. Open Collector: An open collector output is a type of output stage where the collector of the output transistor is not internally connected to any supply voltage. Instead, it is left "open" for external connection. This configuration allows the sensor to be connected to a variety of voltage levels, making it versatile for different control systems. Putting it together, "NPN - Open Collector" in the context of a Panasonic light curtain or area sensor means that the sensor's output uses NPN transistors and has an open collector configuration. This type of output is often used in industrial applications where compatibility with different control systems and devices is necessary.