Absolute rotary encoders use optical, mechanical, or magnetic indexing for angular measurement. They do not lose their position after power-down, but instead provide absolute position upon power-up without requiring a home cycle or any shaft rotation.
Incremental rotary encoders are multi-turn sensors that use optical, mechanical, or magnetic index-counting for angular measurement. They contain no absolute reference, but instead count relative to the turn-on position.
Industrial control pendants are sophisticated, handheld terminals that are used to control robot or machine movements from point to point, within a determined space. They consist of a hanging control console furnished with joysticks, push-buttons or rotary cam switches.
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