Discussion
An incremental encoder differs from an absolute encoder in that it
Answer: B
Correct answer: It reports change, not position
An incremental encoder emits a pulse for each increment of movement, and a counter accumulates them. The count gives position only relative to wherever counting began.
So at power up the position is unknown until a reference is found, which is why such systems run a homing sequence. An absolute encoder instead has a coded track giving a unique pattern for each position, and reports it immediately. Incremental encoders do sense direction, through two channels in quadrature, and either type may be optical or magnetic.
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