Absolute encoders — facts and misconceptions

www.motioncontroltips.com: There are two parts of motion control systems often overlooked or misunderstood; encoders for either the motor rotation or the actual position of the actuator, and the limit and home sensors used for mechanical safeguarding and positional orientation. Encoders are ubiquitous on nearly all motion for industrial applications. Home and limit sensors are also used for almost every application. However, in an effort to limit cost or perceived complexity, machine builders may determine that the use of a home sensor and in some cases, limit sensors, is not required. They either mistakenly rely only on the encoder or don’t understand the encoder they are using.