When a metallic object enters the sensing field of an inductive proximity sensor, what happens to the sensor energy state?

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Inductive proximity sensors are electromagnetic switches. They create a magnetic field around a coil, and when a metallic object enters that field, eddy currents in the metal change the coil’s impedance. The sensing electronics detect this change and switch the output to the active state, delivering current to the load. So, when metal is present in the sensing field, the sensor energizes its output.