Balluff BTL7-V50T-M P-C003 Series - Construction and Function; Construction; Function

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3.1 Construction
Electrical connection: The electrical connection is made
via a connector (see Type code breakdown on page 17).
BTL housing: Aluminum housing containing the
waveguide and processing electronics.
Magnet: Defines the position to be measured on the
waveguide. Magnets are available in various models and
must be ordered separately (see Accessories on page13).
Nominal length: To optimally adapt the transducer to the
application, nominal lengths from 50mm to 7620mm are
available.
3.2 Function
The BTL7 transducer contains the waveguide which is
protected by an aluminum housing. 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 speed.
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 transducer 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 operation 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
Fig. 3-1: BTL7... transducer, construction
3
Construction and function
50
40.6
68
41
36.8
~8011.5 ~80~250 ~250
15
88
37
3
2xM12
11.5
M8
1) Unusable area
2) Not included in scope of delivery
3) Groove on the top side of the profile marks
the start of measuring range
1)
Nominal length =
Measuring range
BTL5-P-3800-2
magnet
1)
Mounting clamps with insulating bushes and
ISO4762M5x22 cylinder head screws,
max. tightening torque 2Nm
2)
2)
Null point
Groove 3)
End point
BTL7-V50T-M ____ -P-C003
Micropulse Transducer in a Profile Housing