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    Encoders
ENCODERS
Absolute Encoders :
These instruments contain a material representation which allows a direct read-out of the angular position, because of which these encoders are called absolute rotary encoders. Encoders with a mechanical store ( gear, drive ) also acquire the amount or revolutions absolute.

Absolute encoders produce a specifically coded value for each shaft position. Absolute encoders assume the task of counting from coupling devices, especially with regard to positioning functions, so that extensive and costly input modules can be eliminated. In addition, reference speeds are eliminated with the activation of the machine or after the loss of supply voltage, since the current position information is immediately available.
Incremental Encoders :
Incremental encoder shows that these encoders work by summing up electrical pulses. To evaluate the measure of length a counter, a PLC-Interface or similar is used. If we look at the frequency itself and not at the individual pulses it is possible to deduce from it directly the revs or the speed.

Incremental encoders deliver a specific number of signals per shaft rotation. The measurement of the cycle duration or counting the pulses per a specific time interval indicates the speed of a motion. If the pulses are added according to a reference point, then the count represents a measure for the marked angle or the distance covered.

In addition, three-channel incremental encoders produce a so-called zero pulse once per rotation.
      Absolute Encoders
      Incremental Encoders
 
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