Photoelectric switches consist of self-testing senders and receivers or veri-fiable senders and receivers in conjunction with an evaluation device. They convince users by both large ranges and different forms and sizes. They are also unsurpassed in terms of safety, complying with the Safety Categories Type 2 and Type 4, according to EN 61496. There are many areas of application: whether on robots, processing machinery, machiningcentres, palletising systems, high-bay warehouses or transfer lines.