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Feature Function Test whether AC220V existsOutput TTL Level can use MCU to test voltage is 3 5VOutput can connect PLC 24VWiring When connecting the PLC input the PLC s COM terminal is connected to the 24V power supply the input is connected to signal outputs S1 S8 of the board optocoupler GND is connected to the power supply negative Blue 5 0 terminal is connected to 220V voltage yellow pin signal output When the 220V voltage is normal it output low level when 220V is powered off it output a high level Note Do not touch any part of the white wireframe on the board after the module is powered on because it is high voltage Pay attention to electricity safety Package includes 1 x Optocoupler Isolation Voltage Test Board
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