Function - Balluff BTL7-V50T-M Serie Betriebsanleitung

BTL7-V50T-M _ _ _ _ -A/B/Y/Z(8)-C003
Magnetostrictive Linear Position Sensor – Rod Style
3
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 PROFINET interface.
PROFINET is an industrial bus system based on the
physical layer of the Ethernet (see www.profibus.com).
The BTL 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.
Implementation is based on the PNO encoder profile V4.1.
The following functions are also available:
– Number of magnets can be parameterized through the
telegram selection. 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
– Reversal of the measuring direction
– Setting presets/offsets
– Temperature sensor. Read out current, minimum, and
maximum temperature.
Synchronous mode with IRT is possible from a cycle time
of 2 ms. The minimum possible cycle time is dependent on
the length and configuration.
Supported PROFINET functions:
– RTC class 1 and 3
– RTA (Real Time Acyclic Protocol)
– DCP (Discover and Configuration Protocol)
– CL-RPC (Connectionless Remote Procedure Call)
– LLDP (Link Layer Discovery Protocol)
– SNMP (Simple Network Management Protocol)
– MRP (Media Redundancy Protocol) Client
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