Aboslute encoders ！

The biggest drawback to incremental encoders is that when the system is powered down, for example during a temporary power outage,it does not track any incremental change output by the encoder. As a result in order to provide accurate position data, an incremental encoder must be rehomed at startup. For an application like a converting machine that might be shut down every night and restarted every morning,this is not a problem. In the case of an automotive assembly robot arm that loses power while welding seat brackets inside a vehicle, rehoming could cause catastrophic damage to both product and robot arm  alike. Absolute encoders provide an effective alternative suitable for high-reliability applications. 

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