Balluff BTL266T, User Manual, Page: 25 / 95

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3.1 Construction
Electrical connection: The electrical connection is made
via a connector (see Type code breakdown on page 17).
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 EtherNet/IP interface.
EtherNet/IP is an industrial bus system based on the
physical layer of the Ethernet (see
www.odva.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.
Implementation is based on the ODVA device profile 22
hex, encoder device.
The following functions are also available:
– Number of magnets can be parameterized. 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
– Temperature sensor. Read out current, minimum, and
maximum temperature.
Supported EtherNet/IP functions:
– DHCP
– BOOTP
– ACD
– DLR V2 (ring topology)
– CIP Sync
– Integrated Switch
– Reset Services, Identity Object Service Type 0/1
– UCMM
Fig. 3-1: BTL7... transducer, construction
3
Construction and function
50
40.6
68
41
36.8
~80 11.5 ~80 ~250 ~250
15
8 83 73
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-V50D-M _ _ _ _ -P-C003
Transducer in a Profile Housing