Linear encoder feedback: Absolute or incremental！

When selecting a linear encoder, the first thing to consider is what type of feedback is needed for the application—absolute or incremental. Absolute encoders assign a unique digital value to each position, which allows them to maintain precise position information, even when power is lost.

Incremental encoders work by generating a specific number of pulses per unit of travel and counting those pulses as the load moves. Because they are simply counting pulses, incremental encoders will lose their position reference if the power supply is interrupted. In order to determine the load’s actual position upon startup or re-start, a homing sequence is required. This means that the sensor (and the load) must move to a reference position, and from there it can begin to determine the load’s position sensor. Keep in mind that even if the load’s actual position at startup or re-start is not critical, performing a homing sequence may be undesirable from a time and productivity standpoint. This is especially important in applications with long strokes and slow speeds, such as machine tools, where homing can be a time-consuming process.

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