Discussion
An absolute encoder differs from an incremental one in that it
Answer: D
Correct answer: reports its position without needing to be homed
An absolute encoder gives a unique code for each position, so the drive knows where the shaft is the instant it powers up. An incremental encoder counts pulses from wherever it happened to start, so the axis must be driven to a reference before its position means anything - which on some machines is neither quick nor safe.
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