Function - Balluff BTL7-V50E-M A-C003 Serie Betriebsanleitung

BTL7-V50E-M _ _ _ _ -A/B/Y/Z(8)-C003
Magnetostrictive Linear Position Sensor – Rod Style
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Construction and function (continued)
3.2

Function

The BTL contains the waveguide which is protected by an
outer stainless steel tube (rod). A magnet is moved along
the waveguide. This magnet is connected to the system
part whose position is to be determined.
The magnet defines the position to be measured on the
waveguide.
An internally generated INIT pulse interacts with the
magnetic field of the magnet to generate a torsional wave
in the waveguide which propagates at ultrasonic velocity.
The component of the torsional wave which arrives at the
end of the waveguide is absorbed in the damping zone to
prevent reflection. The component of the torsional wave
which arrives at the beginning of the waveguide is
converted by a coil into an electrical signal. The travel time
of the wave is used to calculate the position.
This information is transferred via the EtherCAT
EtherCAT is an industrial bus system based on the
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physical layer of the Ethernet (see www.ethercat.org).
The BTL7 can detect and process up to 16 magnets. The
maximum number of magnets depends on the nominal
length. The position and velocity of each magnet can be
output.
The configuration is possible via the CoE interface.
The configuration options include:
– The number of magnets. A fixed number from 1 to 16
or flexible (FMM). In FMM, the number of magnets
corresponds to the number of magnets detected, with
a maximum of 16.
– Setting the resolution of the position and velocity
output
– Setting cam switches
– Defining working range limits
– Reversal of the measuring direction
– Configuration of the process data output (mapping)
The BTL can be operated either asynchronously or
synchronously using the Distributed Clocks.
8 english
interface.
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