Features 1、Output TTL level, can be detected with the microcontroller. The power supply can be 3‑5V. 2、1 channel 220V AC optocoupler detection module. It can be used to detect the being of 220V AC. Can also access PLC24V level. 3、Then the PLC input terminal of the PLC COM power supply 24V input termination of the board signal output OUT, optocoupler board GND power negative. 4、Green 2P 5.0 terminal connected to 220V voltage. 3P terminal connected to the microcontroller input. 5、Great workmanship, can perfect replacement for the old one. Small size, easy to carry and store, convenient to use and with good performance. Specification Item Type: Optocoupler Module Material: PCB Color: As shown in the picture Application: Test 220V AC Package List 1 x Optocoupler Module