For processes with continuous material flow, we use rotary encoders as a reference. The selection of the reference sensor in this case also follows the philosophy of capturing the right data at the right place of the right quality. Rotary encoder data in continuous or start-stop mode of operation, just like linear sensor, often provides information that is really useful, since control response, smooth running and belt extension (two references) have led to immediate findings and troubleshooting in many instances.