Absolute encoders are normally used for

Encoders can be either absolute (or) incremental.

Absolute Encoders:

• These are the feedback devices, that provide speed, position information by outputting a digital word.
• These give output as unique words or bits for each position.
• Absolute encoders are mainly used for the single revolution of the shaft.
• These encoders interpret a system of cooled tracks to create position information where no two positions are identical.
• These don’t lose position whenever power is switched off.
• These also provide programming flexibility.
   

Incremental encoders:

• Incremental encoders provide a relative position with respect to a ‘home’ or zero position.
• These provide output as a continuous stream of pulses.
• Flexible scaling functionality
• Magnetic measuring principle
• Any pulse count up to 16384 pulses per revolution available.