There are many types of encoders available in the market and one such is Position Encoder. Either as linear or angular position, this type of encoder may be measured. It is used to monitor the rotational position of a shaft or liner position of a load whether directly with linear encoders or indirectly through a rotary encoder which has a motor mounted. All this is why the Position Encoder is highly used in many of the industrial applications.
Fanuc ai POSITON ENCODER A860-2109-T302