Working principle of safety grating: general grating generally adopts DC12-24V safety voltage, and the power supply and control line are connected according to protection requirements; The safety grating illuminator transmits infrared light to the light receiver to form an infrared protective light curtain. When no object passes through the grating protective light curtain area, the grating signal can be received normally, the green indicator light is normally on, the fault indicator light is off, and the equipment is normally started. When an object (greater than the protection accuracy) passes through the protection area, the light is in a blocked state, and the grating will transmit this signal to the PLC or alarm. After receiving the signal, the fault indicator red light will turn on, and the equipment will stop running or give a safety alarm, so as to achieve the purpose of safety protection.

The light curtain is composed of a light emitter and a light receiver,

One side of the light curtain is equipped with multiple infrared transmitting tubes at equal intervals, and the other side is equipped with corresponding infrared receiving tubes of the same number and arrangement. Each infrared transmitting tube is equipped with a corresponding infrared receiving tube, which is installed on the same straight line. When there is no obstacle between the infrared transmitting tube and the infrared receiving tube on the same straight line, the modulated signal (optical signal) sent by the infrared transmitting tube can reach the infrared receiving tube smoothly. After the infrared receiving tube receives the modulation signal, the corresponding internal circuit outputs a low level. In the case of obstacles, the modulation signal (optical signal) sent by the infrared transmitting tube cannot reach the infrared receiving tube smoothly. At this time, the infrared receiving tube cannot receive the modulation signal, and the corresponding internal circuit outputs a high level. When there is no object passing through the light curtain, all modulated signals (optical signals) sent by the infrared transmitting tubes can smoothly reach the corresponding infrared receiving tubes on the other side, so that all internal circuits can output low levels. In this way, the information about the existence of an object can be detected by analyzing the state of the internal circuit.

In practical application, the safety grating controller does not need a controller, but only a transmitter and receiver. When in use, it is connected through an aviation plug socket or cable. The output can be directly connected to external relays or various computer digital interfaces.