In terms of input signal detection, the relay detects the system's safety status by receiving input signals. These input signals typically come from various sensors or safety devices, such as light barriers, safety curtains, and emergency stop buttons.
They can convey information such as the presence of objects, whether protective doors are closed, and whether hazardous conditions have occurred. Only when the input signals are in a normal state can the relay function properly, ensuring the smooth operation of subsequent links.
