LINEPULS & LINECOD catalogue 2016 in English

LINECOD
Absolute linear encoders
Absolute linear encoders
An absolute linear encoder is designed to output the absolute position information in
response to motion along a linear path.
It relies on a magnetic reading principle and a unique code pattern encoded on the tape, so
it can provide a unique and unambiguous position within the travel range without requiring
knowledge of any previous position. It follows that you can always gather exactly the position
of the axis. For instance, in case of power loss or failure, then at power-up the absolute
encoder will be able to output the current position of the axis precisely. This means that no
homing or calibration operation is required to determine the current position.
The absolute position datum is calculated by processing the information from a Hall sensor
array / magneto-resistive sensor through the translation circuitry and the interpolation
electronics.
In specific models the encoder can further provide an incremental signal for speed feedback
in addition to the absolute value.
In an absolute measuring system, the absolute coding pole pitch depends on the physical
characteristics of the sensor array deployed in the sensing head.
An absolute encoder provides the motion controller with either analogue signals or a digital
code information. The digital information can be in pure Binary or Gray code format.
Customarily the absolute encoder encompasses serial (SSI, BiSS) output circuits, but it can
also afford analogue and fieldbus interfaces.
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