PLC MPI/DP/PPI Programming Cable for Siemens S7 200/300/400 S7-200 S7-300 S7-400 6ES7 972-0CB20-0XA0 USB-MPI+ PC USB-PPI,USB/MPI PC Adapter USB Cable

The KY-003 is a magnetic switch. If no magnetic field is present, the signal line of the sensor is HIGH (3.5 V). If a magnetic field is presented to the sensor, the signal line goes LOW, at the same time the LED on the sensor lights up. The polarity of the magnetic field is of influence to the switching action. The front side of the sensor needs the opposite polarity as the back of the sensor to switch on.