Safety light curtain, also known as safety light curtain, uses a set of infrared light beams to form a protection grating. When the grating is blocked, the photoelectric protection device sends a signal to control potentially dangerous machinery and equipment to stop working, so as to reduce the worker’s The possibility of injury in the working environment effectively protects the personal safety of the operators. Mainly used in stamping machinery, shearing equipment, metal cutting equipment, automated assembly lines, automated welding lines, mechanical transmission and handling equipment, etc. The selection of safety gratings is simple, and the installation is convenient, mainly for wiring. The common wiring systems are three-wire, five-wire, five-wire, and seven-wire. If it is a street PLC, you can directly connect the NPN and PNP lines to the PLC, and the light curtain can be energized normally. Generally, there will be small marks on the line sequence of the safety light curtain, which can be displayed intuitively. The wiring is very convenient!

The first type: when the controller is not used, the connection diagram of the transmitter and the receiver is explained:

1. The 24V positive voltage power supply is connected to the 24Vdc voltage interface of the receiver, brown wire

2. The test and 0vDC grounding of the transmitter are yellow and blue wires respectively

3. The 0vdc and EDM ports of the receiver are grounded, and the distinction is between blue and green lines

4. The os1 and os2 of the receiver are used as the output, and the black and white lines are connected to it.

Second type: Wiring method of light curtain sensor with controller:

1, the safety light curtain controller through the relay contact self-check 2, 220v AC access to the controller

3. Two relay outputs are output as the controller signal output

4. The light curtain output os1 and os2 are respectively connected to the black line and white line of the light curtain receiver

5. The contact self-checking EDM is connected to the light curtain receiver through the green wire

6. The positive 24vdc of the receiver power supply is connected to the controller through the brown wire, and the negative 0v is connected to the controller through the blue wire

7. The light curtain transmitter is connected to the light curtain self-test TEST switch point of the controller by the yellow wire 8. The positive 24Vdc voltage of the light curtain transmitter is from the brown wire

Connect, 0VdC is connected by blue line

​