Absolute Encoders are electromechanical angular position transducers, being rotary devices that convert the angular position of their rotating axis into electrical pulses. They are called ‘absolute’ because they instantaneously code the position of the rotor in respect of a zero point, thus providing an absolute reference. Such fact is converted into numerical data via a special circuit and can therefore be processed by an external PLC control, counter or positioner. In magnetic encoders, the position is measured through detection — with a fixed sensor — of the magnetic flux generated by a magnetised rotating disk.