SICK MRS6000 User manual

OPERATING INSTRUCTIONS
MRS6000
3D LiDAR sensors

Described product
MRS6000
Manufacturer
SICK AG
Erwin-Sick-Str. 1
79183 Waldkirch
Germany
Legal information
This work is protected by copyright. Any rights derived from the copyright shall be
reserved for SICK AG. Reproduction of this document or parts of this document is only
permissible within the limits of the legal determination of Copyright Law. Any modifica‐
tion, abridgment or translation of this document is prohibited without the express writ‐
ten permission of SICK AG.
The trademarks stated in this document are the property of their respective owner.
© SICK AG. All rights reserved.
Original document
This document is an original document of SICK AG.
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Contents
1 About this document........................................................................ 5
1.1 Information on the operating instructions.............................................. 5
1.2 Explanation of symbols............................................................................ 5
1.3 Further information................................................................................... 6
2 Safety information............................................................................ 7
2.1 Intended use............................................................................................. 7
2.2 Improper use............................................................................................. 7
2.3 Internet protocol (IP) technology.............................................................. 7
2.4 Limitation of liability................................................................................. 7
2.5 Modifications and conversions................................................................ 8
2.6 Requirements for skilled persons and operating personnel.................. 8
2.7 Operational safety and particular hazards.............................................. 9
3 Product description........................................................................... 11
3.1 Scope of delivery....................................................................................... 11
3.2 Status indicators....................................................................................... 11
3.3 Type code.................................................................................................. 11
3.4 Product identification............................................................................... 12
3.5 Principle of operation............................................................................... 13
3.5.1 Measurement principle........................................................... 13
3.5.2 Range finding........................................................................... 13
3.5.3 Direction measurement.......................................................... 14
3.5.4 Impact of object surfaces on the measurement................... 14
3.5.5 Object size................................................................................ 16
3.5.6 Multi-echo analysis.................................................................. 17
3.5.7 Filter.......................................................................................... 18
3.5.8 Multi-layer technology.............................................................. 19
3.5.9 Scan data output..................................................................... 19
3.5.10 RSSI values.............................................................................. 20
4 Transport and storage....................................................................... 21
4.1 Transport................................................................................................... 21
4.2 Unpacking.................................................................................................. 21
4.3 Transport inspection................................................................................. 21
4.4 Storage...................................................................................................... 21
5 Mounting............................................................................................. 23
5.1 Mounting instructions............................................................................... 23
5.2 Mounting device....................................................................................... 23
5.3 Mounting multiple devices....................................................................... 23
6 Electrical installation........................................................................ 24
6.1 Wiring notes.............................................................................................. 24
6.2 Connecting the device electrically........................................................... 25
CONTENTS
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6.3 Prerequisites for safe operation of the device........................................ 27
7 Operation............................................................................................ 30
7.1 Operation via SOPAS ET........................................................................... 30
7.2 Operation with SOPASair.......................................................................... 34
8 Maintenance...................................................................................... 35
8.1 Maintenance plan..................................................................................... 35
8.2 Cleaning..................................................................................................... 35
9 Troubleshooting................................................................................. 36
9.1 General faults, warnings, and errors....................................................... 36
9.2 Repairs...................................................................................................... 36
9.3 Returns...................................................................................................... 36
9.4 Disposal..................................................................................................... 36
10 Technical data.................................................................................... 37
10.1 Features.................................................................................................... 37
10.2 Performance............................................................................................. 38
10.3 Interfaces.................................................................................................. 38
10.4 Mechanics/electronics............................................................................. 38
10.5 Ambient data............................................................................................. 39
10.6 General notes............................................................................................ 39
11 Accessories........................................................................................ 40
12 Annex.................................................................................................. 41
12.1 EU declaration of conformity / Certificates............................................. 41
12.2 Licenses.................................................................................................... 41
CONTENTS
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1 About this document
1.1 Information on the operating instructions
These operating instructions provide important information on how to use devices from
SICK AG.
Prerequisites for safe work are:
•Compliance with all safety notes and handling instructions supplied.
•Compliance with local work safety regulations and general safety regulations for
device applications
The operating instructions are intended to be used by qualified personnel and electrical
specialists.
NOTE
Read these operating instructions carefully to familiarize yourself with the device and its
functions before commencing any work.
The instructions constitute an integral part of the product and are to be stored in the
immediate vicinity of the device so they remain accessible to staff at all times. Should
the device be passed on to a third party, these operating instructions should be handed
over with it.
These operating instructions do not provide information on operating the machine or
system in which the device is integrated. For information about this, refer to the operat‐
ing instructions of the specific machine.
1.2 Explanation of symbols
Warnings and important information in this document are labeled with symbols. The
warnings are introduced by signal words that indicate the extent of the danger. These
warnings must be observed at all times and care must be taken to avoid accidents, per‐
sonal injury, and material damage.
DANGER
… indicates a situation of imminent danger, which will lead to a fatality or serious
injuries if not prevented.
WARNING
… indicates a potentially dangerous situation, which may lead to a fatality or serious
injuries if not prevented.
CAUTION
… indicates a potentially dangerous situation, which may lead to minor/slight injuries if
not prevented.
NOTICE
… indicates a potentially harmful situation, which may lead to material damage if not
prevented.
NOTE
… highlights useful tips and recommendations as well as information for efficient and
trouble-free operation.
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1.3 Further information
NOTE
Further documentation for the device can be found on the online product page at:
•www.sick.com/MRS6000
There, additional information has been provided depending on the product, such as:
•Model-specific online data sheets for device variants, containing technical data,
dimensional drawing, and specification diagrams
•EU declarations of conformity for the product family
•Dimensional drawings and 3D CAD dimension models in various electronic for‐
mats
•This documentation, in English and German and other languages if applicable
•Other publications related to the devices described here
•Publications dealing with accessories
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2 Safety information
2.1 Intended use
The 3D LiDAR sensor MRS6000 reliably detects its surroundings over 24 layers using a
high density of scan points and an aperture angle of 120°. Its special mirror technology
also ensures a high level of scan stability. Using the multi-echo technology, the LiDAR
sensor scans through rain, dust and fog, while simultaneously multiplying the point
density. These properties as especially suitable for complete creation of a 3D point
cloud that can be used to solve many complex applications.
Typical application areas are, for example, anti-collision monitoring and rear area moni‐
toring in industrial (autonomous) vehicles, person counts in passenger locks, monitor‐
ing of land and buildings, volume monitoring, automated guided vehicle systems for
outdoors, robot area, traffic and park management systems.
SICK AG assumes no liability for losses or damage arising from the use of the product,
either directly or indirectly. This applies in particular to use of the product that does not
conform to its intended purpose and is not described in this documentation.
2.2 Improper use
Any use outside of the stated areas, in particular use outside of the technical specifica‐
tions and the requirements for intended use, will be deemed to be incorrect use.
•The device does not constitute a safety component in accordance with the respec‐
tive applicable safety standards for machines.
•The device must not be used in explosion-hazardous areas, in corrosive environ‐
ments or under extreme environmental conditions.
•Any use of accessories not specifically approved by SICK AG is at your own risk.
WARNING
Danger due to improper use!
Any improper use can result in dangerous situations.
Therefore, observe the following information:
■Device should be used only in accordance with its intended use.
■All information in these operating instructions must be strictly observed.
2.3 Internet protocol (IP) technology
NOTE
SICK uses standard IP technology in its products. The emphasis is placed on availability
of products and services.
SICK always assumes the following prerequisites:
•The customer ensures the integrity and confidentiality of the data and rights
affected by its own use of the aforementioned products.
•In all cases, the customer implements the appropriate security measures, such as
network separation, firewalls, virus protection, and patch management.
2.4 Limitation of liability
Relevant standards and regulations, the latest technological developments, and our
many years of knowledge and experience have all been taken into account when com‐
piling the data and information contained in these operating instructions. The manufac‐
turer accepts no liability for damage caused by:
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■Non-adherence to the product documentation (e.g., operating instructions)
■Incorrect use
■Use of untrained staff
■Unauthorized conversions
■Technical modifications
■Use of unauthorized spare parts, consumables, and accessories
With special variants, where optional extras have been ordered, or owing to the latest
technical changes, the actual scope of delivery may vary from the features and illustra‐
tions shown here.
2.5 Modifications and conversions
NOTICE
Modifications and conversions to the device may result in unforeseeable dangers.
Interrupting or modifying the device or SICK software will invalidate any warranty claims
against SICK AG. This applies in particular to opening the housing, even as part of
mounting and electrical installation.
2.6 Requirements for skilled persons and operating personnel
WARNING
Risk of injury due to insufficient training.
Improper handling of the device may result in considerable personal injury and material
damage.
■All work must only ever be carried out by the stipulated persons.
This product documentation refers to the following qualification requirements for the
various activities associated with the device:
■Instructed personnel have been briefed by the operator about the tasks assigned
to them and about potential dangers arising from improper action.
■Skilled personnel have the specialist training, skills, and experience, as well as
knowledge of the relevant regulations, to be able to perform tasks delegated to
them and to detect and avoid any potential dangers independently.
■Electricians have the specialist training, skills, and experience, as well as knowl‐
edge of the relevant standards and provisions to be able to carry out work on elec‐
trical systems and to detect and avoid any potential dangers independently. In Ger‐
many, electricians must meet the specifications of the BGV A3 Work Safety Regu‐
lations (e.g. Master Electrician). Other relevant regulations applicable in other
countries must be observed.
The following qualifications are required for various activities:
Table 1: Activities and technical requirements
Activities Qualification
Mounting, maintenance ■Basic practical technical training
■Knowledge of the current safety regulations in the workplace
Electrical installation,
device replacement
■Practical electrical training
■Knowledge of current electrical safety regulations
■Knowledge of the operation and control of the devices in their
particular application
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Activities Qualification
Commissioning, configura‐
tion
■Basic knowledge of the WindowsTM operating system in use
■Basic knowledge of the design and setup of the described con‐
nections and interfaces
■Basic knowledge of data transmission
Operation of the device for
the particular application
■Knowledge of the operation and control of the devices in their
particular application
■Knowledge of the software and hardware environment for the
particular application
2.7 Operational safety and particular hazards
Please observe the safety notes and the warnings listed here and in other chapters of
this product documentation to reduce the possibility of risks to health and avoid dan‐
gerous situations.
CAUTION
Optical radiation: Laser class 1
The accessible radiation does not pose a danger when viewed directly for up to 100
seconds. It may pose a danger to the eyes and skin in the event of incorrect use.
■Do not open the housing. Opening the housing may increase the level of risk.
■Current national regulations regarding laser protection must be observed.
CAUTION
Hazardous radiation.
If any operating or adjusting devices other than those specified here are used or other
methods are employed, this can lead to dangerous exposure to radiation. Damage to
the eyes is possible.
■If the product is operated in conjunction with external illumination systems, the
risks described here may be exceeded. This must be taken into consideration by
users on a case-by-case basis.
■Do not look into the light source when it is switched on.
■Comply with the latest version of the applicable regulations on photobiological
safety of lamps and lamp systems as well as on laser protection.
WARNING
Electrical voltage!
Electrical voltage can cause severe injury or death.
■Work on electrical systems must only be performed by qualified electricians.
■The power supply must be disconnected when attaching and detaching electrical
connections.
■The product must only be connected to a voltage supply as set out in the require‐
ments in the operating instructions.
■National and regional regulations must be complied with.
■Safety requirements relating to work on electrical systems must be complied with.
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WARNING
Risk of injury and damage caused by potential equalization currents!
Improper grounding can lead to dangerous equipotential bonding currents, which may
in turn lead to dangerous voltages on metallic surfaces, such as the housing. Electrical
voltage can cause severe injury or death.
■Work on electrical systems must only be performed by qualified electricians.
■Follow the notes in the operating instructions.
■Install the grounding for the product and the system in accordance with national
and regional regulations.
WARNING
Electric shock!
Non-insulated electrical conductors are located in the housing. Electrical voltage can
cause severe injury or death.
■Do not open the housing.
■Protect the housing from damage.
■If the housing is damaged, disconnect the device from the voltage supply and do
not put it into operation.
CAUTION
Hazardous radiation!
Using control elements or settings or executing procedures other than those specified
in this document may result in dangerous exposure to radiation.
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3 Product description
3.1 Scope of delivery
The delivery of the device includes the following components:
Table 2: Scope of delivery
Item Component Comments
1 Device in the version ordered Depending on version
Without connecting cables and brackets
1 Set of protective caps for electri‐
cal connections
Attached to the connections
1 Printed Safety Note, multilingual
(No. 8018793)
-
3.2 Status indicators
1
Figure 1: Status indicators
1Status LEDs
Table 3: Display behavior of the LED
Orange LED Green LED Red LED Yellow LED Status
OInitialization
OÖConfiguration
ÖONote (service recommended)
OÖWarning (service required)
OORisk (malfunction)
OOOn / Ready for operation
OData transmission
O = illuminated; Ö = flashing
3.3 Type code
The devices of the MRS6000 product family are arranged according to the following
type code:
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MRS a b cc d ‒ e f g …
1 2 3 4 5 6 7 8 …
Table 4: Type code
Position Description Characteristic
1 Device name type Multilayer Range Sensor
2 Device type 6: MRS6000
3 Version (10% range & FOV) 1: 30m @10%, FOV 120°
4 Modules 24: Multibeam 24L
5 Application R: Ranging
6 Housing version 0: Housing IP65
1: Housing IP67
9: Special version
7 Connection 3: Connector fixed 3 x M12
9: Special version
8 Application package 5: Ranging
9: Special version
… … …
NOTE
Not all combinations are possible according to the type code. The available device vari‐
ants can be found online at:
•www.sick.com/MRS6000
3.4 Product identification
Type label
The following information can be read from the type label on the device:
MRS6124R-131001
Ident No: 6065086
Serial No: 1345678
Voltage: DC XX…YYV
Power: max. YYW
Temp.: -20°C … +60°C IP67MAC: 00:00:00:00:00:00
Manufactured: XXXXXX 20XX Made in Japan Yamanashi
SICK AG, Erwin-Sick-Str. 1, D-79183 Waldkirch, Germany
4
2
5
3
1
Figure 2: MRS6000 type label (example)
1QR code with product data, approval symbol, test mark, warning symbol: observe the
operating instructions!, electrical voltage!
2Technical data
3Manufacturer address, production date, production location
4Part number, serial number, MAC address
5Type code
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3.5 Principle of operation
3.5.1 Measurement principle
The device is an opto-electronic LiDAR sensor that uses non-contact laser beams to
scan the outline of its surroundings. The device measures its surroundings in two-
dimensional polar coordinates, relative to its measurement origin. Its measurement ori‐
gin is marked by a circular indentation in the center of the optics cover. If a laser beam
strikes an object, the position of that object is determined in terms of distance and
angle.
With the MRS6000, this is done in 24 layers. Here, 4 scan planes with 6 layers each
are detected one after the other.
Figure 3: Principle of operation
14 scan planes with 6 layers each
2Vertical axis
3Horizontal axis
The angular resolution is 0.13°. This produces a fine network of measuring points (3D
point cloud) for the scanned working range (120° horizontal, 15° vertical).
Figure 4: Principle of operation, 3D display
3.5.2 Range finding
The device emits beams pulsed by a laser diode. If the laser beam is reflected by an
object, the reflected beam is received by the sensor.
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The distance to the object is calculated on the basis of the time that the pulsed light
beam requires to be reflected and received by the sensor.
t
1 2
1Send pulse
2Receive pulse
3.5.3 Direction measurement
The laser beams are emitted using 4 internally rotating polygon mirrors and scan the
surroundings orbitally on 4 planes. The measured values are assigned to the associ‐
ated angular cut, and thus to the direction, by 6 receive elements.
3.5.4 Impact of object surfaces on the measurement
The received signal from a perfectly diffuse reflection from a white surface (diffuse
Lambertian reflector) corresponds to a remission of 100%. By this definition, surfaces
that reflect the light in bundles (specular surfaces, reflectors) have remissions of over
100%.
Reflection
Most surfaces produce a diffuse reflection of the laser beam in all directions. The struc‐
ture (smooth or rough), shape (flat or curved), and color (light or dark) of the surface
determine how well the laser beam is reflected.
On very rough surfaces, part of the energy is lost due to shadowing. Curved surfaces
produce a higher diffusion. Dark surfaces reflect the laser beam worse than light ones
(brilliant white plaster reflects approx. 100% of the light, while black foam rubber
reflects approx. 2.4%). The aforementioned surface characteristics can reduce the
scanning range of the device, in particular for surfaces with low remission values.
Figure 5: Reflection of light on the surface of the object
Angle of reflection
The angle of reflection corresponds to the angle of incidence. If the laser beam hits a
surface at right angles, the energy is optimally reflected. If the laser beam hits a sur‐
face at an oblique angle, energy and range are lost accordingly.
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Figure 6: Angle of reflection
Retroreflection
If the reflective energy is greater than 100%, the beam is not reflected diffusely in all
directions; instead it is reflected in a targeted way (retroreflection). Thus a large part of
the emitted energy can be received by the laser distance measurer. Plastic reflectors
(cat’s eyes), reflective tape, and triple prisms have these properties.
Figure 7: Retroreflection
Reflective surfaces
The laser beam is almost completely deflected on reflective surfaces. This means that
an object hit by the deflected beam may be detected instead of the reflective surface.
Figure 8: Specular surfaces
Small objects
Objects that are smaller than the diameter of the laser beam cannot reflect the laser
light’s full energy. The portion of the light beam that does not reach the object is lost. If
all of the light reflected to the sensor is insufficient, the object may not be detected.
The portion of the light that does not reach the front object can be reflected by a larger
object in the background. If all of the light reflected to the sensor is sufficient, this
object is detected.
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Figure 9: Object smaller than the laser beam diameter
3.5.5 Object size
Light spot divergence
As the distance from the device increases, the laser beam expands. As a result, the
dimension of the light spot on the surface of the object.
1
2
Characteristic Value
Light spot divergence 2.1 mrad (horizontal) x 65.4 mrad (vertical)
Light spot size on the front screen of
the device
0.25 mm (horizontal) x 8.0 mm (vertical)
Light spot size at a distance of 25 m 0.05 m (horizontal) x 1.64 m (vertical)
Formula for calculating the light spot width:
Light spot divergence [rad] x Distance [mm] + Light spot width at the n device cover
[mm] = Light spot width [mm]
Formula for calculating the height of the light spot:
Light spot divergence [rad] x Distance [mm] + Light spot height at the n device cover
[mm] = Light spot width [mm]
This results in a light spot size of 52.8 mm x 1643 mm for a distance of 25 m, for
example.
The high angular resolution and the 24 layers enable scans that have practically no
gaps.
At a distance of 25 m, the distance between tow light spots in the horizontal axis is only
roughly 1 mm. Each light spot is detected by 6 receive diodes, whereby 6 measuring
points are produced per light spot.
Due to the angular resolution of 0.13°, 924 measuring points are detected per layer in
a scan (120°).
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1 1 1 1 1 … 1
2 2 2 2 2 … 2
3 3 3 3 3 … 3
4 4 4 4 4 … 4
5 5 5 5 5 … 5
6 6 6 6 6 … 6
7 7 7 7 7 … 7
… …
1
3
2
54
6
7
Figure 10: MRS6000 light spot and measuring points
1Light spot width / measuring point width (56.6 mm at distance of 25 m)
2Distance between 2 measuring points (approx. 1 mm at distance of 25 m)
3Minimum object size (56.7 mm at distance of 25 m)
4Vertical distance between 2 measuring points (272 mm at distance of 25 m)
5Light spot height (1641 mm at distance of 25 m)
6Vertical detection range = 4x light spot height (6401 mm at distance of 25 m)
7Horizontal detection range (923 measuring points above 120°)
3.5.6 Multi-echo analysis
The distance between the device and an object is calculated via the time-of-flight of the
emitted pulse. The MRS6000 can evaluate up to four echo signals for each measuring
beam to deliver reliable measurement results, even under adverse ambient conditions.
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Figure 11: Multi-echo analysis
1Glass pane
2Fog
3Rain
4Measuring object
3.5.7 Filter
By using digital filters to pre-process and optimize the measured distance values, the
device can be tailored to the specific requirements of the respective application. This
makes it possible to prevent virtually all faults.
You can arbitrarily combine the filters. If several filters are active, then the filters are
applied sequentially to the results of the preceding filter. Processing occurs in the fol‐
lowing sequence: echo filter, particle filter, ground reference evaluation. It should be
noted, however, that the measurement data output may be delayed due to the multiple
calculation steps.
The active filter functions affect the output measured values. It is not possible to recal‐
culate the original measured values from the filtered output values.
Echo filter
The echo filter screens out unwanted measurement data and signals caused by rain,
dust, snow, and other ambient conditions. You can set whether the first, the last, or all
three echoes are output. The other pulses triggered by undesirable ambient conditions
are not taken into account.
•First echo: The field evaluation evaluates the first echo. In the measured value
output the first echo is output in the telegram.
•Last echo: The field evaluation evaluates the last echo. In the measured value out‐
put the last echo is output in the telegram.
•All echoes: The field evaluation evaluates the first echo. In the measured value
output all echoes are output in the telegram.
Particle filter
The particle filter blanks small, irrelevant reflection pulses in dusty environments and in
rain or snow which are caused by dust particles, raindrops, snowflakes or the like. It
should be noted that the particle filter functionality is only available on the first or last
echo and at distances of a maximum of 30 m.
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Ground detection
Ground detection recognizes objects lying on the road, as well as steps or depressions.
The sensitivity of the filter can be adjusted to different road surfaces, from smooth/
level (-) to rough/uneven (+).
It should be noted that the ground detection functionality is only available on the first or
last echo and at distances of a maximum of 30 m. If the condition of the surface is
defined as rough/uneven, flat objects lying on the ground may not be classified as
objects.
3.5.8 Multi-layer technology
The multi-layer technology of the device allows compensation of the pitch angle through
24 layers at different vertical angles, when attached to a vehicle for example. In this
way, the device detects the object reliably, for example even when the vehicle acceler‐
ates or brakes.
3.5.9 Scan data output
The device has 4 polygon mirrors that each detect one plane. 6 layers are detected per
plane.
The data is output for each scan. Every 100 ms, the data is output with 24 telegrams in
each case (1 telegram per layer). The duration of data output for all data of a scan
depends on the connection speed. At highest transmission speed (1 GBit Ethernet), the
output duration is approx. 8 ms.
Marks for scan (scan counter), plane (time stamp) and layer (layer angle) are included
in the data telegram for data assignment.
Data telegram (example):
1<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC0 56BB 86BD0263 88BFBE92 F0 0 0 0 F5B2 3E8 ...
2<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC1 56BB 86BD0263 86BFC40A F0 0 0 0 F62F 3E8 ...
3<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC2 56BB 86BD0263 86BFC88F F0 0 0 0 F6AC 3E8 ...
4<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC3 56BB 86BD0263 86BFCD77 F0 0 0 0 F729 3E8 ...
5<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC4 56BB 86BD0263 86BFD252 F0 0 0 0 F7A6 3E8 ...
6<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC5 56BB 86BD0263 86BFD51C F0 0 0 0 F823 3E8 ...
7<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC6 56BB 86BD640B 86BFDAE7 F0 0 0 0 F8A0 3E8 ...
8<STX>sSN LMDscandata 1 0 10736D01 0 0 1CC7 56BB 86BD640B 86BFDF8F F0 0 0 0 F91D 3E8 ...
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… …
23 <STX>sSN LMDscandata 1 0 10736D01 0 0 1CD6 56BB 86BE275B 86C01C1C F0 0 0 0 70 3E8 ...
24 <STX>sSN LMDscandata 1 0 10736D01 0 0 1CD7 56BB 86BE275B 86C01F29 F0 0 0 0 ED 3E8 ...
Scan (scan counter):
•Lines 1 to 24: 56BB = 22203
•The scan number is a consecutive number. All 24 layers of a scan have the same
scan number.
Layer (time stamp):
•Lines 1 to 6: 86BS0263 = 2260533859 = 2260533.859 ms
•Lines 7, 8 (… to 12): 86BD640B = 2260558859 = 2260558.859 ms
•The time stamp is a time specified in milliseconds (start of measurement of a
layer since switching on the device). All 6 layers of a scan have the same time
stamp. The difference between 2 consecutive planes of a scan is 25 ms.
Layer (layer angle):
•Line 1: F5B2 = -2638 (corresponds to -13.19°) = Position 24
•Line 2: F62F = -2513 (corresponds to -12.565°) = Position 23
•Line 23: 70 = 112 (corresponds to 0.56°) = Position 2
•Line 24: ED = 237 (corresponds to 1.185) = Position 1
•The layer address is an angle specified in degrees (horizontal angle, physical). The
difference between 2 consecutive layers of a scan is 0.625°.
3.5.10 RSSI values
RSSI (Received Signal Strength Indicator) is the measure of the signal strength that the
device receives. This value is determined for each measurement and has a logarithmic,
arbitrary unit.
The RSSI values have a resolution of 16 bits with whole-number values between 1 and
65535, where 1 stands for the weakest signal and 65534 for the strongest signal (e.g.
with one reflector).
A value of 65535 means “dazzled”. The value 0 (zero) means that the received energy
was too low to produce a valid RSSI value. A valid distance measurement has at least
an RSSI of 1.
If the RSSI value is 0, then no distance measurement is possible. There can be two rea‐
sons for this:
•The target object lies outside the sensing range.
•The target object has an extremely low remission.
Please note that white paper can have very similar values as a reflector at a short dis‐
tance.
The RSSI values can vary slightly among different devices and during the service life of
the device.
3 PRODUCT DESCRIPTION
20 O P E R A T I N G I N S T R U C T I O N S | MRS6000 8022069/114M/2019-07-17 | SICK
Subject to change without notice