turck LTX Series User manual

Your Global Automation Partner
Operating instructions
LTX
Linear Position Sensors
with SSI Interface

2
Hans Turck GmbH & Co. KG | T [phone] | F [phone] | [e-mail] | www.turck.com

Contents

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2017/09
1 About these Instructions 5
1.1 Target Groups 5
1.2 Explanation of Symbols 5
1.3 Other Documents 5
1.4 Feedback on these Instructions 5
2 Notes on the Product 6
2.1 Product Identication 6
2.2 Scope of Delivery 6
2.3 Legal Requirements 7
2.4 Manufacturer and Service 7
3 For Your Safety 7
3.1 Intended Use 7
3.2 General Safety Instructions 7
4 Product Description 8
4.1 Device Overview 8
4.1.1 Display Elements 8
4.2 Properties and Characteristics 9
4.3 Functional Principle 9
4.4 Functions and Operating Modes 9
4.4.1 Automatic Signal Control 10
4.4.2 Update Mode 10
4.4.3 Measuring Functions 11
4.4.4 Preferred Type LTX…M-F10-SSI2-GAF1-X3-H1161 – Measuring Range 11
4.5 Technical Accessories 12
5 Mounting 14
5.1 Mounting the Device in a Hydraulic Cylinder 15
5.1.1 Mounting the Sensor 15
5.2 Fastening the Device Externally with Mounting Bracket 16
5.2.1 Mounting Additional Mounting Elements (for External Mounting) 17
5.2.2 Mounting Positioning Elements (for External Mounting) 17
6 Connection 18
6.1 Wiring Diagram 18
7 Commissioning 18
8 Operation 19
8.1 LED Display 19
9 Eliminating Interference 20
9.1 Replacing the Sensor Head and Measuring Element 20
10 Maintenance 20
11 Repair 20
11.1 Returning Devices 20
12 Disposal 20
13 Technical Data 21
13.1 Update Time 21

Contents

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2017/09
1 About these Instructions
These operating instructions describe the structure, functions and the use of the product, and
will help you to operate the product as intended. Read these instructions carefully before us-
ing the product. This is to avoid possible personal injury, or damage to property or the device.
Retain these instructions for future use during the service life of the product. If the product is
passed on, pass on these instructions as well.
1.1 Target Groups
These instructions are aimed at qualified personnel and must be carefully read by anyone
mounting, commissioning, operating, maintaining, dismantling or disposing of the device.
1.2 Explanation of Symbols
The following symbols are used in these instructions:
DANGER
DANGER indicates an imminently hazardous situation with a high risk of death or seri-
ous injury if it is not prevented.
WARNING
WARNING indicates a potentially hazardous situation with a moderate risk of death or
severe injury if not prevented.
CAUTION
CAUTION indicates a situation that may result in damage to property if it is not
prevented.
NOTE
NOTE indicates tips, recommendations and important information. The notes make
work easier, contain information on specific action steps and help prevent unnecessary
work due to incorrect processes.
CALL TO ACTION
This symbol identifies steps that the user has to perform.
ACTION RESULT
This symbol identifies relevant results of actions and action sequences.
1.3 Other Documents
Besides this document, the following material can be found on the internet at www.turck.com:
■Data sheet
1.4 Feedback on these Instructions
We are committed to always keeping these instructions as informative and as clear as possible.
If you have any suggestions for improving the design or if some information is missing in the
document, please send your suggestions to t[email protected].

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Notes on the Product
2 Notes on the Product
2.1 Product Identication
NOTE
■Designs with manufacturer compatible connectors and models with enlarged blind
zones are available on request.
■Device LTX…M-F10-SSI2-GAF1-X3-H1161 is the preferred type.
2.2 Scope of Delivery
Included in the scope of delivery:
■Linear position sensor (without positioning element)
■Quick start guide
LTX 100 M Magnetostrictive
position sensor –
Unit
M Millimeter
Measuring range
100 from 25 to 7500 mm
Operating principle
LTX Linear position sensor
LTX 100 M – F10 – SSI 2 – G A F 1 – X3 – H1 1 6 1
F10 Design –
Design
F10 Flat face, rod Ø 10.3 mm,
aluminum*
R10 Raised face, rod Ø 10.3 mm,
aluminum
EF10 Flat face, rod Ø 10.3 mm,
stainless steel
ER10 Raised face, rod Ø 10.3 mm,
stainless steel
SSI 2 – G A F 1 – X3 Electrical version –
Number of LEDs
X3 3-color LED
Resolution
10.005 mm*
20.01 mm
30.05 mm
40.1 mm
50.02 mm
60.002 mm
70.001 mm
Direction
Fforward*
Rbackward
Vvelocity
Data type
Ssynchronous
Aasynchronous*
Data format
Bbinary
Ggray*
Data length
124 bit
225 bit*
326 bit
Data mode
H1161
Electrical connection:
Male
Assignment
1Standard assignment
Number of contacts
66-pin
Connector type
1straight
Connector type
H1 Male connector M12 x 1
* Preference type

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2.3 Legal Requirements
The device is subject to the following EU directives:
■2014/30/EU (electromagnetic compatibility)
■2011/65/EU (RoHS 2)
2.4 Manufacturer and Service
Turck supports you with your projects, from initial analysis to the commissioning of your ap-
plication. The Turck product database contains software tools for programming, configuration
or commissioning, data sheets and CAD files in numerous export formats. You can access the
product database at the following address: http://www.turck.de/products/
Should you have any further questions, please contact the sales and service team in Germany
on the following telephone numbers:
Sales: [phone]
Technology: [phone]
Outside Germany, please contact your Turck representative.
Hans Turck GmbH & Co. KG
Witzlebenstraße 7
45472 Mülheim an der Ruhr
Germany
3 For Your Safety
The product is designed to the latest standards. However, residual risks still exist. Observe the
following warnings and safety information to prevent personal injury or damage to property.
Turck accepts no liability for damage caused by failure to observe these warning and safety
instructions.
3.1 Intended Use
These devices are designed solely for use in industrial areas.
The magnetostrictive linear position sensors are used for contactless and wear-free linear
position detection. The devices are suitable for use in hydraulic cylinders. The devices can also
be used for level measurement through the use of float magnets (optionally available). The
measuring range is adjustable.
The devices must only be used as described in these instructions. Any other usage shall be con-
sidered improper and Turck shall not be held liable for any resulting damage.
3.2 General Safety Instructions
■The devices are not safety components and may not be used for personal or property
protection.
■The device must only be fitted, installed, operated, parameterized and maintained by trained
and qualified personnel.
■The device only meets the EMC requirements for industrial areas and is not suitable for use in
residential areas.

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Product Description
4 Product Description
The linear position sensors with SSI interface provide a serial synchronous interface output
signal (SSI) proportional to the position of the positioning element. Different device variants
enable the following measuring functions to be performed:
■Position measurement, measuring direction forwards
■Position measurement, measuring direction backwards
■Speed measurement
The devices can be connected via a M12 plug connector. All devices feature a rod design with
IP68 protection. The devices operate without contact, which requires the use of a positioning
element approved by Turck (see Accessories).
The devices operate in absolute mode; voltage failures do not require renewed zero point ad-
justment or recalibration. All position values are determined as absolute values; reference runs
after a voltage drop are unnecessary.
4.1 Device Overview
Fig. 1: Device dimensions of LTX with standard blind zones (in mm)
4.1.1 Display Elements
Each device has a 3-color LED for indicating the operating state and for fault diagnostics (see
8.1 LED display).
24
44.5
ø 44.5
ø 10.3
10
M18 x 1.5 x 25
M12 x 1
81.3
L
63.5
Blind zone
50.8
Blind zone
Measuring
range

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4.2 Properties and Characteristics
■SSI output
■Automatic signal control
■7…30 VDC supply voltage
■Low power consumption
■High shock and vibration resistance
■Protection class IP68
■16 bit resolution
■Status displayed via 3-color LED
■Sensor and pressure pipe can be replaced separately
■Male connector M12
4.3 Functional Principle
Operation of the Turck LTX sensors is based on the magnetostrictive principle. A“waveguide”
is located in the measuring probe of the linear position sensor. If a current signal generated at
the waveguide encounters the externally applied magnetic field of the positioning element,
mechanical feedback is produced in the waveguide. This feedback is evaluated in the sensor
head and output as position information.
4.4 Functions and Operating Modes
The devices have an SSI interface according to the RS422 standard. The process value is trans-
ferred via the interface either directly to the higher-level controller (with SSI card) or to a field-
bus device.
Fig. 2: Block diagram of the sensor control
The location of the positioning element on the sensor measuring probe is determined by
means of a propagation time measurement and transmitted to the controller via the SSI inter-
face. All position values are determined as absolute values; reference runs after a voltage drop
are unnecessary.
+7…30 V
0 V
SSI Clock (+)
SSI Clock (–)
SSI Data (+)
SSI Data (–)
Input
Power
Supply
SSI Shift Register and Controller
Output Data Format Conversion
SSI Logic Diagram
Position Measurement

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Product Description
New incoming position data is transferred via the data signal 605 ns after the rising edge of the
clock signal. This time frame, including the elapsed time caused by the length of the cable, must
be allowed for when defining the transmission rates.
Fig. 3: SSI pulse diagram: Bitwise transmission from most significant bit (MSB) to least signifi-
cant bit (LSB)
4.4.1 Automatic Signal Control
The device is automatically adjusted to the signal strength of the positioning element as soon
as the sensor is supplied with power. The automatic signal control fully compensates for any
tolerances.
4.4.2 Update Mode
The devices can be operated in synchronous or asynchronous update mode. In asynchronous
mode, up to 2000 measurements (depending on length, see also the "Update time" section) can
be carried out per second to update the position values. In synchronous mode, the clock rate
for the update depends on the controller (max. 2000 measurements per second, depending on
length). In synchronous mode, if the controller queries the position data on the sensor faster
than the data is provided by the sensor, the sensor automatically switches to asynchronous
mode and continues to provide the latest position information to the controller.
NOTE
Turck recommends operating the device in asynchronous update mode, if no highly
dynamic control requirement is involved.
Fig. 4: Synchronous and asynchronous update mode
min. 16 µs
Clock (+)
Data (+)
Clock Interval
LSBMSB
SSI Clock
Synchronous
Asynchronous
Controller
Update
Internal
Repetition
Update
Position
Update
Position
Update
Position
Update
Position
Update
Position
Update
Position
Update
Position

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2017/09
Synchronous update mode
The clock pulse rate of the controller sets the frequency for reading the position data. The sen-
sor transmits one position data bit to the controller with each pulse. The first clock edge of the
controller signals the sensor to carry out a new position measurement. The updated position
data is transferred in the next read cycle.
NOTE
In synchronous mode, the position data available to the controller is no more than one
update cycle old.
Asynchronous update mode
The sensor carries out position measurements according to a fixed internal request rate (sensor-
internal measurement cycle) and provides the position information when requested by the
controller.
4.4.3 Measuring Functions
Different device variants are available for performing different measuring functions:
Device type Measuring function
LTX…SSI…F… Position, measuring direction
forwards
The position value is incremented during the
movement along the measuring probe starting
from the sensor head.
LTX…SSI…R… Position, measuring direction
backwards
The position value is incremented during the
movement in the direction of the sensor head
starting from the end of the measuring probe.
LTX…SSI…V… Speed measurement The sensor provides speed information directly.
4.4.4 Preferred Type LTX…M-F10-SSI2-GAF1-X3-H1161 – Measuring Range
Preferred types LTX…M-F10-SSI2-GAF1-X3-H1161 are available with the following measuring
lengths as standard:
Measuring range set
100…500 mm in 25 mm steps
500…2000 mm in 50 mm steps
2000…7600 mm in 500 mm steps

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Product Description
4.5 Technical Accessories
The following accessories are not included in the scope of delivery:
Dimension drawing Type Ident. no. Description
Positioning element
ø 32,8
ø 23,8
ø 4,7
ø 13,5
16,8
7,9
STM-AL-R10 6900409 Standard 4-hole positioning element, alu-
minum, suitable for installation in hydraulic
cylinders
ø 25,4
7,9
ø 13,5
CM-R10 6900416 Standard positioning element, suitable for
installation in hydraulic cylinders










LSPM-AL-R10 6900414 Ring-type positioning element with slot,
aluminum, can be used for external mount-
ing with mounting clamp RB-R10
50,8
ø 14,1
ø 50,8
max.
ø 52,1
EF-R10 6900417 Float-positioning element, stainless steel,
specific weight 0.62 kg/m³, for external
mounting for level monitoring
Spacer
ø 32,8
ø 23,8
ø 4,7
ø 13,5
16,8
6,4
STS-R10 6900411 Standard spacer produced from non-ferritic
material for separating the positioning ele-
ment from the ferritic base of the hydraulic
piston rod, suitable for installation in hydrau-
lic cylinders

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2017/09
Dimension drawing Type Ident. no. Description
Accessories for external mounting
#6-32
ø 7,1
31,7
23,8
50,8
76,2
25,4
15,7
50,8
ø 14,2 MMB-R10 6900004 Mounting clamp for positioning element, for
external mounting, with screws and standard
STS-R10 spacer
50,8
19,3
12,7
ø 12,2
ø 10,5
50,8
26,2
ø 7,1
ø 7,1
31,7
50,8
76,2
25,4
15,7
50,8
ø 19,5 MB-R10 6900419 Mounting clamp for sensor head and rod, for
external mounting, with screws
50,8
19,3
12,7
ø 12,2
ø 10,5
50,8
26,2
ø 7,1
RB-R10 6900420 Mounting clamp for rod, for external mount-
ing, with screws

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Mounting
5 Mounting
The device can be mounted in a hydraulic cylinder or externally with a mounting bracket.
CAUTION
Incorrect mounting
Risk of damage to the sensor
 Only fasten the device in place using the hexagon nut on the sensor head (max.
tightening torque: 50Nm).
 Do not fasten by turning the sensor head itself.
 Ensure that the positioning element is guided centrally over the pressure pipe along
the entire measuring length (deviation < 0.5 mm).
Fig. 5: Side view of LTX-R10 with dimensions in mm [in] (design with raised face)
Fig. 6: Design with flat face (F10) – Housing nut with thread,
dimensions in mm [in]
Fig. 7: Design with raised face (R10) – Housing nut with thread,
dimensions in mm [in]
81.3 [3.20]
2.5 [.10]
7.1 [.28]
ø 25.4 [1.00]
ø 44.5 [1.75]
7.9
[.31]
ø 10.3 [.405]
32.8 [1.28]
M12 x 1 3-color LED
LTX…M: M18x1.5-6gx25mm thread
w/jam nut
LTX…E: 3/4-16x1.00 thread
w/jam nut
Viton O-ring
for 1/2“ dia
tube boss seal
Span 63.5 [2.50] Dead band
50.8 [2.00] Null
Standard 4-hole positioning element
(STM-AL-R10)
9.6
[.38]
2.5 [.10]
7.1 [.28]
ø 25.4 [1.00]

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2017/09
5.1 Mounting the Device in a Hydraulic Cylinder
CAUTION
Incorrect mounting
Risk of damage to the hydraulic cylinder
 Observe cylinder manufacturer instructions and hydraulic cylinder specifications.
The devices can be mounted directly in a hydraulic cylinder. To do so, the cylinder piston rod
must have a bore hole with a recommended diameter of 13.5 mm (depending on the cylinder
design). To fasten the device, the end cap of the hydraulic cylinder must have an M18×1.5
threaded bore in accordance with ISO 6149-1.
5.1.1 Mounting the Sensor
 Loosen and remove the hexagon nut on the sensor from the thread on the sensor head.
 Ensure that the O-ring is located on the sensor head for pressure sealing.
 Mount the non-ferrite spacer between the positioning element and base of the piston rod.
 Mount the positioning element. Observe a minimum distance of 51 mm between the posi-
tioning element and sensor head with the piston rod in the retracted position. If the mini-
mum distance cannot be observed, sink the positioning element in the cylinder piston.
 Recommended for sensors with measuring probe lengths ≥ 1500 mm: use protecting ring,
e.g. made of polymer (see Fig. 8, Item 2). The protecting ring prevents mechanical wear on
positioning elements by the pressure pipe when the piston is fully extended.
 Fasten the positioning element and spacer with non-ferrite screws.
 Remove protective cap on the hydraulic cylinder (if present). The bore hole in the cylinder
piston rod should have a diameter of at least 13.5 mm.
 Insert the sensor pressure pipe into the cylinder piston.
 Screw the sensor into the M18 × 1.5 threaded bore of the hydraulic cylinder using the thread
of the sensor head (max. tightening torque: 50Nm).
23
4
5
1
1 Viton O-ring
2 Protecting ring
(optional)
3 4-hole positioning
element
4 Spacer for positioning
element
5 13.5 mm bore hole in
the cylinder piston rod
Fig. 8: Mounting the Device in a Hydraulic Cylinder

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Mounting
5.2 Fastening the Device Externally with Mounting Bracket
CAUTION
Magnetization of metal in close proximity with the measuring probe
Inaccurate measurements
 Mount the sensor measuring probe at least 7 mm away from ferromagnetic material.
NOTE
Non-ferrous materials, such as brass, copper, aluminum, demagnetized stainless steel
or plastic do not impair the function of the sensor.
 Loosen the hexagon nut on the thread of the sensor head.
 Guide the mounting bracket over the pressure pipe up to the sensor head.
 If the mounting bracket has an M18 × 1.5 threaded hole, screw the sensor tight directly.
 Fasten the mounting bracket.
 Re-fasten the hexagon nut on the sensor head.
Fig. 9: Mounting device with mounting brackets (dimensions in mm)
ø 7.1
32
25.4
7 x 26
11
50.8
50.8
MB-R10
MMB-R10
RB-R10

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2017/09
5.2.1 Mounting Additional Mounting Elements (for External Mounting)
On devices over 750 mm in length, additional mounting elements (RB-R10) increase protection
against mechanical stresses such as impacts and vibrations. The mounting elements must be
made from non-ferrite material.
 When using additional mounting elements, use a ring-type positioning element with slot as
the positioning element.
 Fit mounting elements made from ferromagnetic (already magnetized) material at least 7 mm
away from both the blind zone and the active measuring range of the sensor.
 Sensors with measuring probe lengths of 750…1800 mm: Fit additional mounting elements
as per Fig. 10:
 Sensors with measuring probe lengths > 1800 mm: Fit mounting elements at distances of
1200 mm.
5.2.2 Mounting Positioning Elements (for External Mounting)
 Observe a distance of 7 mm between the positioning element and ferrite material. Use a
spacer if necessary.
 Observe a distance of 7 mm between the end of the measuring probe and ferrite material.
The positioning element must not touch the sensor along the entire measuring range.
 When using ring-type positioning elements with slot: Observe ≤ 5 mm distance between the
positioning element and measuring probe (nominal distance: 1.5 mm).
 Push the positioning element into the active measuring range of the sensor.
 Fasten the positioning element with non-ferrite screws.
50,831,8
25,4
11
7,1
25,4
26,2
16,9
36
25,4
15,7
ø 7,1 (2x)
31,8
50,8
50,8
50,8
ø 7,1 (2x)
1
2
34
6
Dead bandStrokeNull
1 Sensor
2 Mounting element for
sensor head
3 4-hole positioning ele-
ment (aluminum)
4 Spacer for positioning
element
5 Mounting element for
positioning element
6 Mounting element for
measuring probe
Fig. 10: Mounting the positioning element (dimensions in mm)

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Connection
6 Connection
NOTE
Turck recommends keeping the length of the connection lines as short as possible.
The running lengths of the connection lines are limited and depend on the SSI clock frequen-
cies. Different clock rates are recommended depending on the length of the connection lines.
Clock rate and data frame lengths are set by the master.
Line length [m] Baud rate
< 3 1 MBd
< 50 < 400 kBd
< 100 < 300 kBd
< 200 < 200 kBd
< 360 < 100 kBd
 Connect the coupling of the connection cable to the connector of the device.
 Connect the sensor to the higher level as per the connector pin assignment (Fig. 11).
6.1 Wiring Diagram
NOTE
The following figure details the usual wire colors. In exceptional cases, this color alloca-
tion may differ.
Pin Pin assignment Wiring Diagram
Pin 1 UB +

 
 





 
 
 



 
Pin 2 Data +
Pin 3 GND
Pin 4 Data -
Pin 5 Clock -
Pin 6 Clock +
Fig. 11: Wiring Diagram
7 Commissioning
Once the cables and the supply voltage are connected, the device automatically goes into
operation. To ensure the correct calibration of the automatic signal control, the positioning ele-
ment must be located in the active measuring range of the sensor when the supply voltage is
connected.

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2017/09
8 Operation
8.1 LED Display
Color/status Meaning
off No power supply present
Illuminated in green Positioning element signal detected in taught range, SSI clock signal
operational
Illuminated in yellow No SSI clock signal detected
Illuminated in red No positioning element signal detected
Red flashing/red-green
flashing
Internal error
Green with brief yellow
flashing (1 s to 0.12 s)
Data not synchronous with controller (only in synchronous mode)
Yellow with brief red flashing
(1 s to 0.12 s)
SSI clock pulses do not match the SSI data length
Proceed as follows if no positioning element signal is detected (red LED lit):
 Place the positioning element in the active measuring range of the device.
 Reset the voltage.
 The device is automatically adjusted to the signal strength of the positioning element.
If, in synchronous mode, the data is not synchronized with the controller (LED green with brief
yellow flashing, 1 s to 0.12 s), proceed as follows:
 Increase the update time via the module settings of the SSI master.

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Eliminating Interference
9 Eliminating Interference
If the device does not function as expected, check the LED feedback (see section“LED display”).
Check whether ambient interference is present. If there is no ambient interference, check the
connections of the device for faults.
If there are no errors, there is a device malfunction. In this case, decommission the device and
replace it with a new device of the same type.
9.1 Replacing the Sensor Head and Measuring Element
WARNING
Overpressure at the sensor head
Risk of injury through uncontrolled ejection of sensor head
 In pressurized systems, ensure that the pressure pipe is undamaged and
pressure-proof.
NOTE
 The system does not have to be depressurized for a fluid cylinder application.
The sensor head and measuring element can be replaced independently of the pressure pipe.
 Loosen the screws on the sensor head.
 Pull the sensor head and measuring element out of the housing.
 Insert a new sensor head and measuring element into the housing.
 Secure the screws, e.g. with Loctite 243.
 Fasten the screws on the sensor head (max. tightening torque < 1 Nm).
10 Maintenance
Ensure that the plug connections and cables are always in good condition. The devices are
maintenance-free; if necessary clean dry.
11 Repair
The device is not intended for repair by the user. The device must be decommissioned if it is
faulty. Please refer to our terms and conditions of return when returning devices to Turck.
11.1 Returning Devices
If a device has to be returned, bear in mind that only devices with a decontamination declara-
tion will be accepted. This is available for download at
http://www.turck.de/de/produkt-retoure-6079.php
and must be filled in completely and affixed to the outside of the packaging such that it is
secure and cannot be impaired by adverse weather.
12 Disposal
Devices must be properly disposed of and must not be included in general household
waste.