Photoelectric sensors are devices that detect the presence or absence of an object by emitting light and measuring the changes in the light as it reflects off the object. They come in a variety of types, designed for specific industrial uses. These sensors perform different tasks. Every kind of photoelectric sensor has its own function and application range. For example, PM2.P photoelectric sensors can be used in variety of sectors and are ideal for the detection, counting and positioning of objects. They are known important components in hardware that provide specific information about products or workpieces. Because of their technological features like the ability to align a beam precisely, their sensing modes like diffuse, retroreflective and through-beam and the fact that they can operate in different environments ranging from conditions of sunshine and rain to conditions of snow storms, photoelectric sensors have use wide coverage. Their applications include industries such as Manufacturing and Automation, Infomation and Electronics, Logistics and Security and they are playing an ever important role in making system operation efficient and accurate.