Reference Point Function - Balluff BML-S1F A M 0 0-KA Série Notice D'utilisation

BML-S1F_-A/Q _ _ _ -M_ _ 0- _ 0-...
Incremental Magnetic Linear Encoder
3
Construction and function (continued)
3.3

Reference point function

For every incremental position measuring system, the
reference position is the indispensable starting point for
counting.
The way the reference position is detected depends on the
sensor head, the magnetic tape, and the controller.
Advantages of pole-periodic and fixed periodic magnetic
tapes: The magnetic tapes can be purchased in long
lengths and cut individually.
Reference point functions are possible with both linear and
round magnetic tapes.
No or pole-periodic reference signal:
System consisting of:
– BML-S1F...-M_00-... (none) or
BML-S1F...-Q61...-M320-... (pole-periodic)
– BML-M...-I_ _-...-R0000 magnetic tape
BML-S1F1...M_00/BML-S1F1...M320
BML-S1F2...M_00/BML-S1F2...M320
BML-M...-I_ _-...-R0000
In the most basic position measuring system, the sensor
head detects the magnetic periods using the incremental
sensors. The magnetic tape contains a track with magnetic
north and south poles. The position is detected by the
controller by adding up the counted increments.
With a pole-periodic reference signal, a reference signal is
output for each magnetic pole, i.e. every 1 mm. In this
case, an external reference switch must be set at the
selected reference point signal. The controller evaluates
the reference position at the moment when the switch and
the reference signal from the sensor head are active.
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Single or double reference signal:
System consisting of:
– BML-S1F...-M310-...
– BML-M...-I3 _-...-R_ _ _ _/0000 (single signal) or
BML-M...-I3 _-...-R_ _ _ _/_ _ _ _ (double signal)
magnetic tape
BML-S1F1...M310
BML-S1F2...M310
BML-M...-I3 _-...-R_ _ _ _/0000
A sensor head with an additional reference point sensor
can output a reference signal as soon as it reaches the
magnetically coded reference point on the second track of
the magnetic tape. An external reference switch is not
necessary.
Fixed-periodic reference signals:
System consisting of:
– BML-S1F...-M310-...
– BML-M...-I3 _-...-C0006/_ _ _ _ magnetic tape
BML-S1F1...M310
BML-S1F2...M310
BML-M...-I3 _-C0006/_ _ _ _
The sensor head with additional reference point sensor can
also be combined with a magnetic tape with fixed-periodic
reference points. Here, the references points are integrated
over the entire length of the tape at specific, uniform
distances, e.g. every 10 cm.
To determine the exact absolute position, the reference run
must be performed up to the external selection switch.
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