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ABSOLUTE VERSUS INCREMENTIAL ENCODERS

absolute_vs_incremental_1
ABSOLUTE VERSUS INCREMENTIAL ENCODERS

Positioning tasks require precise values in order to monitor and control movement activity. In many applications, the detection is done using rotary encoders, also called angular position encoders or simply encoders. These sensors transform the mechanical angular position of a shaft or axis into an electronic signal which can be processed by a control system.

Absolute Rotary Encoders

Absolute rotary encoders are capable of providing single position values from the moment they are energized as well as immediately after a power failure. This is done by scanning the positions of coded material. All positions correspond to a fixed code in these systems. Equal motions that occur while the system is unpowered are translated into precise position values once the encoder is powered up again.

absolute
Absolute Rotary Encoders
  • Principles of magnetic and optical measurement
  • Several optional interfaces: Analog, Ethernet, Fieldbus, Parallel and SSI
  • Resolution Up to 14 bits
  • Revolution Single-turn and multiturn info

Incremental Rotary Encoders

Incremental encoders measure the value of the angle by counting the material through a periodic pattern, starting arbitrarily. This method of measurement does not in itself give absolute positions with respect to a signal. Initial referencing of the reference point is therefore unavoidable in all positioning tasks, whether at start-up of the control system or whenever the encoder has been stopped.

incremental
Incremental Rotary Encoders
  • Symmetrical circuit (HTL) and RS422 (TTL)
  • Any number of pulses up to 16384 pulses per revolution
  • Principles of Magnetic Measurement

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