ASTECH LDS10A User manual

Manual
LDS10A
Version 1.0

LDS10A Manual
Page 2 ASTECH GmbH
Dear User,
You are advised to carefully read this User Manual before powering on the
LDS10A LED distance sensor for the first time.
This is necessary to ensure that you will be able to utilize all the capabilities
and features which your new acquisition provides.
This technology is subject to continuously ongoing development.
Editorial deadline: May 2018
Firmware version: ≥1.0
Manual version: V 1.1
File: Manual_LDS10A_EN_V1.1.docx
Note:
Proper care has been used in compiling this document. No liability will be
accepted in the event of damage resulting from failure to comply with the
information contained herein.
Revisions history
Manual Version
Date
Changes
1.0
01.02.2018
First release
1.1
01.05.2018
First update
ASTECH GmbH, Schonenfahrerstr. 5, 18057 Rostock, Germany
Internet www.astech.de E-Mail [email protected]
Phone +49 (0)381 / 44073-0 Fax +49 (0)381 / 44073-20

LDS10A Manual Content
ASTECH GmbH Page 3
I. Content
1 General ............................................................................................ 7
2 Safety Instructions........................................................................... 7
2.1 General Safety Instructions .....................................................7
2.2 Intended & Conforming Use....................................................7
2.3 Nonconforming use .................................................................8
2.4 LED Classification.....................................................................9
2.5 Electric Supply ......................................................................... 9
2.6 Important Operating Advice....................................................9
3 Technical Data ............................................................................... 10
4 Mechanical Mounting Conditions .................................................11
5 Electrical Connection.....................................................................12
5.1 Connector Terminal............................................................... 12
5.2 RS485 connection..................................................................14
5.3 Analog current output...........................................................14
5.4 Digital switching outputs Q1 and Q2.....................................16
5.5 Device LEDs............................................................................17
6 Start-up and measurement principle ............................................19
6.1 Start up ..................................................................................19
6.2 Measurement principle .........................................................20
6.3 Measurement rate.................................................................22
7 MODBUS-Parameter......................................................................24
7.1 General ..................................................................................24
7.2 Read-only parameters ...........................................................24
7.3 Write-only parameters ..........................................................25

Content LDS10A Manual
Page 4 ASTECH GmbH
7.4 Read/Write parameters.........................................................27
7.5 MODBUS RTU –Register addressing .....................................32
8 Part Numbers.................................................................................34
9 EG Declaration of Conformity........................................................35

LDS10A Manual Content
ASTECH GmbH Page 5
II. List of Figures
Figure 1 : Dimensional drawing.............................................................11
Figure 2 : LDS10A connector pin assignments ......................................12
Figure 3 : Wiring diagram of analog output ..........................................14
Figure 4 : Output current and parameter of QA ...................................15
Figure 5 : Digital switching output.........................................................16
Figure 6 : Device LEDs............................................................................17
Figure 7 : Program ProsoftP1 ................................................................19
Figure 8 : Example for parameter OFFSET.............................................29

Content LDS10A Manual
Page 6 ASTECH GmbH
III. List of Tables
Table 1 : Technical Data.........................................................................10
Table 2 : Pin assignment connector and interface cable.......................13
Table 3 : Meaning of Status-LED signals................................................18
Table 4 : Meaning of Output-LED signals ..............................................18
Table 5 : Examples for resulting measurement rate .............................23
Table 6 : Status byte information ..........................................................25
Table 7 : Factory settings of the LDS10A ...............................................25
Table 8 : Teach byte description............................................................26
Table 9 : List of Modbus register addresses ..........................................32
Table 10 : Part Numbers........................................................................34

LDS10A Manual General
ASTECH GmbH Page 7
1General
The LDS10A is an industrial grade distance sensor using advanced
measurement and detection capabilities based on patented signal processing
algorithms. It provides different interfaces to transmit the detection results to
post processing unit like PLCs in industrial applications.
The implemented sensing technology is based on infrared LED illumination
and the time-of-flight of light principle. The LED emitters illuminate the area of
interest (pulsed at high frequency) and the single channel sensor receiver
collects the backscatter of the emitted light and measures the time taken for
the emitted light to return back to the sensor. A single photodetector is used
and provides a full-beam sensing module. Oversampling and accumulation
techniques are used to provide extended resolution and range.
2Safety Instructions
2.1 General Safety Instructions
These safety and operating instructions should be carefully read and followed
during practical work with the LDS10A.
There is danger of electrical shock. For necessary repair work, the
LDS10A may not be opened by anyone other than authorized
personnel. Unauthorized intervention into the inner product space
will void any warranty claims.
Compliance with all specified operating conditions is necessary.
Failure to observe advisory notes or nonconforming product usage may cause
physical injury to the user or material damage to the LDA10A.
Cable connectors must not be plugged or unplugged under voltage.
Remember to turn voltage supply off before you begin working on cable
connections.
2.2 Intended & Conforming Use
Measurement of distances
Special measuring functions

Safety Instructions LDS10A Manual
Page 8 ASTECH GmbH
Compliance with prescribed temperatures for operation/storage
Operation at correct voltage level
Application of specified signal levels to the appropriate data lines
2.3 Nonconforming use
Do not operate the LDS10A in any other way than described under
"Intended & Conforming Use" above and only in a proper working
condition
Safety devices must not be defeated or otherwise rendered
ineffective
Information and warning signs must not be removed
Repair work on the LDS10A must not be carried out by anyone
other than authorized personnel.
Avoid using the LDS10A without certified protection in an explosive
environment
Measurement with the LDS10A pointed at the sun or other strong
light sources may produce faulty results
Measurement of targets with poor surface reflectance in a strongly
reflecting environment may also result faulty measurements.
Measurement of strongly reflecting surfaces may deliver faulty
results.
Measurement performed through transparent optical media, for
example glass, optical filters, Plexiglas, etc. may equally produce
incorrect results.
Measurement on translucent objects (materials allow light to pass
through, but are not transparency, e.g. polystyrene, wax, different
plastics etc.) can give a too large measured value, since also light is
reflected by deeper layers
Rapidly changing measuring conditions are likely to falsify the result
of measurement

LDS10A Manual Safety Instructions
ASTECH GmbH Page 9
2.4 LED Classification
The LDS10A meets the requirements of the “Exempt lamp class” of IEC
62471:2006.
The sensor can be used without any additional safety protection.
2.5 Electric Supply
Use only 10 V to 30 V (direct voltage) for LDS10A operation. Use only the
specially designated connector terminal for voltage supply.
Specified signal levels must not be exceeded, in order to guarantee correct
data communication.
2.6 Important Operating Advice
To make full use of the systems inherent performance capabilities and achieve
a long service life, you should always follow these operating rules:
Do not touch any of the module's parts with bare hands.
Proceed with care when removing dust or contamination from
optical surfaces!
Prevent shock impacts during transport and use of the LDS10A
Prevent the LDS10A from overheating.
Prevent the LDS10A from major temperature variances during
operation
In accordance with IP67 internal protection standards, the LDS10A
is designed to be splash proof and dustproof.
Read these safety and operating instructions with care and follow
them in practical use.

Technical Data LDS10A Manual
Page 10 ASTECH GmbH
3Technical Data
Table 1 : Technical Data
Sensing range1)
Onto natural target (20 %)
Onto target board (90%)
0.1 m … 10 m
0.1 m … 40 m
Accuracy2)
50 mm
Repeatability
± 5 mm
Resolution
1 mm
Measuring frequency
2.2 Hz … 140 Hz
Lighting
Infrared-LED, 850 nm
Lighting classification
Exempt class IEC 62471:2006
Lighting beam divergence
3°
Receiver beam divergence
6°
Operating temperature
-25 °C up to +75 °C
Supply voltage
10 V … 30 V DC (protected against polarity
reversal)
Power consumption
< 3 W
Serial data interface
RS485, MODBUS RTU, 19.400 Baud
Digital output
2x PNP, NO/NC selectable
Analogue output
0/4 mA ... 20 mA current output,
Adjustable range limits, 10 bit
Load impedance of analogue
Output
< 500 Ωat VCC = 24V, < 150 Ω at VCC = 12 V
Status indicator
2x RGB-LED on top cover
Connector
8 pin, M12-standard, male
Housing material
Aluminum, powder coated
Dimensions (L x W x H)
131 mm x 64 mm x 50 mm, incl. connector
Weight
280 g
Mounting
2 holes for M4 screws, 105 mm x 56 mm
Protection class
IP 67 (waterproof and dust protected)
EMC
IEC 61326-1
1) Dependent on target reflectance, surface structure, ambient light and atmospheric conditions
2) Single measurement, statistical spread 95 %

LDS10A Manual Mechanical Mounting Conditions
ASTECH GmbH Page 11
4Mechanical Mounting Conditions
The casing consists of rugged, corrosion-resistant, casted aluminum with
powder coating. It provides 2 through holes for base plate mounting.
Figure 1 : Dimensional drawing
The zero-point has been introduced for constructional design reasons. It is
located appr. 8 mm above the bottom of the housing and can be compensated
with the help of parameter “Offset“.

Electrical Connection LDS10A Manual
Page 12 ASTECH GmbH
5Electrical Connection
5.1 Connector Terminal
The male connector flange is made in compliance with industry M12-standard
with 8 pins. This connector type guarantees optimized screening and a high IP
degree. The connection provides IP67 protection in connected state.
Compatible cable jacks and interface cables with different length are available
(standard 5 m).
Figure 2 : LDS10A connector pin assignments

LDS10A Manual Electrical Connection
ASTECH GmbH Page 13
Table 2 : Pin assignment connector and interface cable
Pin
Color
Assignment
Function
1
White
Q1
Digital output 1
2
Brown
VCC
Power supply
3
Green
Q2
Digital output 2
4
Yellow
RS485-B
RS485 line B, inverted
5
Grey
RS485-A
RS485 line A, not inverted
6
Pink
QA
Analogue output 4-20 mA
7
Blue
GND
Ground (power supply)
8
Red
GND-RS485
Ground (RS485, internally
connected to GND)
GND wires are connected to an internal collective ground point. They provide
the reference potential for all voltage values quoted below.
Caution: If input signals are applied to an output port, this may
damage the LDS10A!
Do not connect the current output QA to the power supply. This will
destroy the interface board!
All outputs are protected against steady short-circuit currents.
Caution: The cable end is exposed! The user is responsible to take
precautions that will prevent any kind of shorts! The cable shield has
to be connecting to earth with low resistance.

Electrical Connection LDS10A Manual
Page 14 ASTECH GmbH
5.2 RS485 connection
The serial data interface of the LDS10A works according to the RS485-standard
(EIA-485) with two data lines with inverse polarity. It provides fieldbus
capabilities with multiple access and device identification by address.
The used protocol is Modbus RTU with binary data transmission. The
communication setup is as follows:
Baudrate: 19.200 baud
Parity: even
Start/Stop bits: 1 Stop Bit
The signal lines of the RS485 interface should not be left open. If not in use it
is recommended to connect a termination resistor of 120 Ω between the
signal lines A and B.
5.3 Analog current output
The purpose of the analog output QA is to allow transmission of measured
values as analogue current value. QA can be configured to a range of
4 mA …20 mA (factory setting) or 0 mA …20 mA. In second case the output
current can be transformed to 0-10V by a 500 Ωprecision resistor. The
parameter QA_KBYTE controls the current range of QA.
Figure 3 : Wiring diagram of analog output

LDS10A Manual Electrical Connection
ASTECH GmbH Page 15
The current is proportional to the measured target distance. This applies
within a distance interval that is marked by the two limiting parameters
QA_LOW and QA_HIGH, where QA_HIGH may be greater or smaller than
QA_LOW. The output current value for 4 mA … 20 mA output is calculated
according to this equation:
QA_LOW < QA_HIGH: IOUT[mA] = 4 mA + 16 ∙ (Distance−QA_LOW
QA_HIGH - QA_LOW)∙mA
QA_LOW < QA_HIGH: IOUT[mA] = 20 mA - 16 ∙ (Distance−QA_HIGH
QA_LOW - QA_HIGH)∙mA
Example:
QA_LOW
QA_HIGH
0 m
2 m
4 m
6 m
8 m
10 m
11 m
2 m
10 m
4 mA
4 mA
8 mA
12 mA
16 mA
20 mA
20 mA
QA_LOW
QA_KBYTE = 1 - QA = 0 mA
QA_KBYTE = 2 - QA = 4 mA
QA_HIGH QA = 20 mA
Figure 4 : Output current and parameter of QA

Electrical Connection LDS10A Manual
Page 16 ASTECH GmbH
5.4 Digital switching outputs Q1 and Q2
With the help of a user-selectable distance threshold, the switching outputs
Q1 and Q2 can be set to monitor objects or conditions for positive or negative
overstep.
Using the digital switching outputs, objects can be monitored for excision of a
threshold value. To do this, parameter settings for a measurement window
are required. Settings for this window can be made with four parameters:
Qx_ON, Qx_OFF, Qx_HYST, Qx_NONC (x=1 means Q1, x=2 means Q2)
The range which will be subject to monitoring begins at Qx_ON and ends at
Qx_OFF. Switching transitions can be set via parameter Qx_HYST.
All distance parameters are given in millimeters.
The logic state of the switching output is determined by the parameter
QX_NONC. See chapter 7 for more information about parameterization of Q1
and Q2.
Qx_HYST Qx_HYST
Qx_ON
Qx_NONC = 1
Qx_NONC = 0
Qx_OFF
Qx_HYST Qx_HYST
Qx_ON Qx_OFF
Figure 5 : Digital switching output

LDS10A Manual Electrical Connection
ASTECH GmbH Page 17
Example:
A moving object is assumed to be monitored with output Q1 in normally open
mode within a window of 8 m to 9 m with a hysteresis of 0.2 m.
Q1_ON = 8000
Q1_OFF = 9000
Q1_HYST = 200
Q1_NONC = 0
5.5 Device LEDs
There are two multi-color LEDs on the front side of the LDS10A. They are
supposed to signalize the current status without any connected data interface.
Figure 6 : Device LEDs
Meanings of the LED-colors are shown in Table 3 and Table 4.
Status
Output

Electrical Connection LDS10A Manual
Page 18 ASTECH GmbH
Table 3 : Meaning of Status-LED signals
Signal
Meaning
Green, blinking
Target reflectivity barely sufficient
Green
Target reflectivity ok
Red, blinking
Temperature warning, temperature 4
Kelvin before end of range
Red
Temperature range exceeded
Blue, blinking
Target reflectivity not sufficient
Blue
Internal communication error
Reset necessary
Off
Output-LED is blinking red
Table 4 : Meaning of Output-LED signals
Signal
Meaning
Green
No output active
Red
Q1 and/or Q2 active
Red blinking
Max. current of Q1 and/or Q2
exceeded
Off
Status-LED is blinking blue

LDS10A Manual Start-up and measurement principle
ASTECH GmbH Page 19
6Start-up and measurement principle
6.1 Start up
Make sure that all cable ends are protected against short circuit effects before
you turn on power supply!
Connect cable terminals as required for the particular operating mode. To
prevent short circuits, you should seal unused cable ends!
For starting up, a PC with RS485 data interface or suitable USB-to-RS485
converter is required. We recommend the Windows program ProsoftP1
Version 2.17 or higher.
Figure 7 : Program ProsoftP1
As part of preparative actions, the LDS10A must be properly installed in the
designated working site, oriented onto the target and kept in a stable position.
The target to be measured should preferentially have a homogeneous, bright
surface.

Start-up and measurement principle LDS10A Manual
Page 20 ASTECH GmbH
6.2 Measurement principle
The measurement principle of the LDS10A consists of a number of separate
data acquisition and processing algorithms.
Signal Acquisition
The signal acquisition module samples the signal of the photodiode element
using a patented oversampling and accumulation strategy to maximize the
signal resolution and the signal to noise ratio. It provides the light intensity
received by the sensor as a function of the time (corresponding to distance
knowing the speed of light) also called full-waveform signal. This full-
waveform signal allows the use of advanced signal processing techniques to
extract the distances of the objects and other useful information about the
scene.
Static Noise Removal
The static noise removal algorithm removes, as its name indicates, the static
noise in the full-waveform signal induced by undesirable light reflections due
to sensor enclosure or electromagnetic interferences. This algorithm increases
drastically the distance measurement accuracy and linearity. The static noise
shape is learned during a calibration procedure during which the waveform of
the signal is captured while the reception lens of the sensor is shielded from
the backscattered light. The sensor comes with a static noise factory
calibration.
Pulse Detection
The objects in the sensor field of detection create a particular signature in the
full-waveform signal called pulses. The pulse detector analyses the full-
waveform signal in order to recognize these pulses and compute their
distance. By nature, time-of-flight sensor using full-waveform analysis is able
to detect several distinct objects with a single photodiode element.
The detected pulses have specific amplitudes based on their distance from the
sensor and on the reflectivity of the objects. It is well known that pulses of
small amplitudes do not lead to accurate and precise distance measurements.
Consequently, the algorithm removes all pulses with amplitudes under a given
threshold.