Leuze electronic MLC 500 Series User manual

SAFE IMPLEMENTATION AND OPERATION
Original operating instructions
EN 2019/03/11 - 50137900 We reserve the right to make technical changes
MLC 520S
Safety Light Curtains

© 2019
Leuze electronic GmbH & Co. KG
In der Braike 1
D-73277 Owen / Germany
Phone: [phone]
Fax: [phone]
http://www.leuze.com
[email protected]
Leuze electronic MLC 520S 2

Table of contents
Leuze electronic MLC 520S 3
Table of contents
1 About this document ............................................................................................5
1.1 Used symbols and signal words ............................................................................................. 5
1.2 Checklists................................................................................................................................ 6
2 Safety .....................................................................................................................7
2.1 Intended use and foreseeable misuse.................................................................................... 7
2.1.1 Intended use........................................................................................................................7
2.1.2 Foreseeable misuse ............................................................................................................8
2.2 Necessary competencies........................................................................................................ 8
2.3 Responsibility for safety.......................................................................................................... 9
2.4 Disclaimer ............................................................................................................................... 9
3 Device description ..............................................................................................10
3.1 Device overview of the MLC family....................................................................................... 10
3.2 Connection technology ......................................................................................................... 10
3.3 Cascading ............................................................................................................................. 11
3.4 Display elements .................................................................................................................. 12
3.4.1 Operation indicators on the MLC520S transmitter/receiver .............................................12
4 Functions.............................................................................................................14
4.1 Start/restart interlock RES .................................................................................................... 14
4.2 EDM contactor monitoring .................................................................................................... 15
5 Applications ........................................................................................................16
5.1 Point of operation guarding................................................................................................... 16
6 Mounting..............................................................................................................17
6.1 Arrangement of transmitter and receiver .............................................................................. 17
6.1.1 Calculation of safety distanceS ........................................................................................17
6.1.2 Calculation of safety distance if protective fields act orthogonally to the approach direction.. 18
6.1.3 Minimum distance to reflective surfaces ...........................................................................21
6.1.4 Preventing mutual interference between adjacent devices ............................................... 22
6.2 Mounting the safety sensor................................................................................................... 23
6.2.1 Suitable mounting locations ..............................................................................................23
6.2.2 Mounting with O-shaped mounting brackets ..................................................................... 24
6.2.3 Mounting with C-shaped mounting brackets .....................................................................25
6.2.4 Mounting with L-shaped mounting brackets...................................................................... 27
6.2.5 Mounting with L- and C-shaped mounting brackets .......................................................... 29
6.3 Mounting accessories ........................................................................................................... 30
6.3.1 Deflecting mirror for multiple-side guarding.......................................................................30
6.3.2 Mounting cascading ..........................................................................................................30
7 Electrical connection..........................................................................................33
7.1 Pin assignment transmitter and receiver .............................................................................. 33
7.1.1 MLC520S transmitter .......................................................................................................33
7.1.2 MLC520S receiver............................................................................................................34
8 Starting up the device ........................................................................................35
8.1 Switching on ......................................................................................................................... 35
8.2 Aligning the sensor ............................................................................................................... 35
8.3 Minimum distance for cascade system................................................................................. 37
8.4 Selection of RESTART mode and operation ........................................................................ 37
8.5 Unlocking start/restart interlock ............................................................................................ 39

Table of contents
Leuze electronic MLC 520S 4
9 Testing .................................................................................................................40
9.1 Before commissioning and following modifications .............................................................. 40
9.1.1 Checklist for integrator – to be performed prior to commissioning and following modifica-
tions...................................................................................................................................40
9.2 To be performed periodically by competent persons............................................................ 42
9.3 Periodically by the operator .................................................................................................. 42
9.3.1 Checklist – periodically by the operator.............................................................................42
10 Maintenance ........................................................................................................44
11 Troubleshooting..................................................................................................45
11.1 What to do in case of failure? ............................................................................................... 45
11.2 Operating indicator of the LEDs............................................................................................ 45
12 Disposing.............................................................................................................48
13 Service and support ...........................................................................................49
14 Technical data .....................................................................................................50
14.1 General specifications .......................................................................................................... 50
14.2 Dimensions, weight, response time ...................................................................................... 52
14.3 Dimensioned drawings: Accessories .................................................................................... 54
15 Order guide and accessories.............................................................................57
16 EU/EC Declaration of Conformity......................................................................60

About this document
Leuze electronic MLC 520S 5
1 About this document
1.1 Used symbols and signal words
Tab.1.1: Warning symbols and signal words
Symbol indicating dangers to persons
Symbol indicating possible property damage
NOTE Signal word for property damage
Indicates dangers that may result in property damage if the measures for dan-
ger avoidance are not followed.
CAUTION Signal word for minor injuries
Indicates dangers that may result in minor injury if the measures for danger
avoidance are not followed.
WARNING Signal word for serious injury
Indicates dangers that may result in severe or fatal injury if the measures for
danger avoidance are not followed.
DANGER Signal word for life-threatening danger
Indicates dangers with which serious or fatal injury is imminent if the measures
for danger avoidance are not followed.
Tab.1.2: Other symbols
Symbol for tips
Text passages with this symbol provide you with further information.
Symbol for action steps
Text passages with this symbol instruct you to perform actions.
Symbol for action results
Text passages with this symbol describe the result of the preceding action.
Tab.1.3: Terms and abbreviations
Response time The response time of the protective device is the maximum time between the
occurrence of the event that results in activation of the safety sensor and the
provision of the switching signal at the interface of the protective device (e.g.,
OFF state of the OSSD pair).
AOPD Active Optoelectronic Protective Device
(Active Optoelectronic Protective Device)
ESPE Electro-sensitive protective equipment
EDM Contactor monitoring
(External Device Monitoring)
LED LED, display element in transmitter and receiver
MLC Brief description of the safety sensor, consisting of transmitter and receiver
MTTFdMean time to dangerous failure
(Mean Time To dangerous Failure)
OSSD Safety-related switching output
(Output Signal Switching Device)

About this document
Leuze electronic MLC 520S 6
PFHdProbability of a dangerous failure per hour
(Probability of dangerous Failure per Hour)
PL Performance Level
RES Start/restart interlock
(Start/REStart interlock)
Scan Consecutive scans of the protective field from the first to the last beam
Safety sensor System consisting of transmitter and receiver
SIL Safety Integrity Level
State ON: device intact, OSSD switched on
OFF: device intact, OSSD switched off
Locking: device, connection or control / operation faulty, OSSD switched off
(lock-out)
1.2 Checklists
The checklists (see chapter 9 "Testing") serve as a reference for the machine manufacturer or supplier.
They replace neither testing of the complete machine or system prior to initial commissioning nor their peri-
odic testing by a qualified person (see chapter 2.2 "Necessary competencies"). The checklists contain mini-
mum testing requirements. Depending on the application, other tests may be necessary.

Safety
Leuze electronic MLC 520S 7
2 Safety
For mounting, operating and testing, this document as well as all applicable national and international stan-
dards, regulations, rules and directives must be observed. Relevant and supplied documents must be ob-
served, printed out and handed to affected persons.
ÄBefore working with the safety sensor, completely read and observe the documents applicable to your
task.
In particular, the following national and international legal regulations apply for the commissioning, techni-
cal inspections and work with safety sensors:
• Directive 2006/42/EC
• Directive 2014/35/EU
• Directive 2014/30/EU
• Directive 89/655/EEC supplemented by directive 95/63EC
• OSHA 1910 Subpart O
• Safety regulations
• Accident-prevention regulations and safety rules
• Ordinance on Industrial Safety and Health and employment protection act
• Product Safety Law (ProdSG and 9. ProdSV)
NOTICE
For safety-related information you may also contact local authorities (e.g., industrial inspec-
torate, employer's liability insurance association, labor inspectorate, occupational safety and
health authority).
2.1 Intended use and foreseeable misuse
WARNING
A running machine may result in serious injury!
ÄMake certain that the safety sensor is correctly connected and that the protective function of
the protective device is ensured.
ÄMake certain that, during all conversions, maintenance work and inspections, the system is
securely shut down and protected against being restarted.
2.1.1 Intended use
• The safety sensor may only be used after it has been selected in accordance with the respectively ap-
plicable instructions and relevant standards, rules and regulations regarding labor protection and safety
at work, and after it has been installed on the machine, connected, commissioned, and checked by a
competent person (see chapter 2.2 "Necessary competencies"). The devices are designed for indoor
use only.
• When selecting the safety sensor it must be ensured that its safety-related capability meets or exceeds
the required performance level PLr ascertained in the risk assessment (see chapter 14.1 "General
specifications").
• The safety sensor protects persons or body parts at points of operation, danger zones or access points
of machines and systems.
• With the access guarding function, the safety sensor detects persons only when they enter the danger
zone but cannot tell whether there are any persons inside the danger zone. For this reason, a start/
restart interlock or a suitable stepping behind protection in the safety chain is essential in this case.
• Maximum permissible approach speeds (see ISO13855):
• 1.6m/s for access guarding
• 2.0m/s for guards of points of operation
• The construction of the safety sensor must not be altered. When manipulating the safety sensor, the
protective function is no longer guaranteed. Manipulating the safety sensor also voids all warranty
claims against the manufacturer of the safety sensor.

Safety
Leuze electronic MLC 520S 8
• The improper repair of the protective device may result in loss of the protective function. Make no re-
pairs to the device components.
• The safety sensor must be inspected regularly by a competent person to ensure proper integration and
mounting (see chapter 2.2 "Necessary competencies").
• The safety sensor must be exchanged after a maximum of 20 years. Repairs or the exchange of wear
parts do not extend the mission time.
2.1.2 Foreseeable misuse
Any use other than that defined under the “Approved purpose” or which goes beyond that use is consid-
ered improper use.
In principle, the safety sensor is not suitable as a protective device for use in the following cases:
• Danger posed by ejected objects or the spraying of hot or hazardous liquids from within the danger
zone
• Applications in explosive or easily flammable atmospheres
2.2 Necessary competencies
The safety sensor may only be configured, installed, connected, commissioned, serviced and tested in its
respective application by persons who are suitably qualified for the given task. General prerequisites for
suitably qualified persons:
• They have a suitable technical education.
• They are familiar with the relevant parts of the operating instructions for the safety sensor and the oper-
ating instructions for the machine.
Task-specific minimum requirements for competent persons:
Configuration
Specialist knowledge and experience in the selection and use of protective devices on machines as well as
the application of technical rules and the locally valid regulations on labor protection, safety at work and
safety technology.
Specialist knowledge in programming safety-related controls SRASW acc. to ISO13849-1.
Mounting
Specialist knowledge and experience needed for the safe and correct installation and alignment of the
safety sensor with regard to the respective machine.
Electrical installation
Specialist knowledge and experience needed for the safe and correct electrical connection as well as safe
integration of the safety sensor in the safety-related control system.
Operation and maintenance
Specialist knowledge and experience needed for the regular inspection and cleaning of the safety sensor –
following instruction by the person responsible.
Servicing
Specialist knowledge and experience in the mounting, electrical installation and the operation and mainte-
nance of the safety sensor in accordance with the requirements listed above.
Commissioning and testing
• Experience and specialist knowledge in the rules and regulations of labor protection, safety at work and
safety technology that are necessary for being able to assess the safety of the machine and the use of
the safety sensor, including experience with and knowledge of the measuring equipment necessary for
performing this work.
• In addition, a task related to the subject matter is performed in a timely manner and knowledge is kept
up to date through continuous further training ‑ Competent person in terms of the German Betrieb-
ssicherheitsverordnung (Ordinance on Industrial Safety and Health) or other national legal regulations.

Safety
Leuze electronic MLC 520S 9
2.3 Responsibility for safety
Manufacturer and operator must ensure that the machine and implemented safety sensor function properly
and that all affected persons are adequately informed and trained.
The type and content of all imparted information must not lead to unsafe actions by users.
The manufacturer of the machine is responsible for:
• Safe machine construction and information on any residual risks
• Safe implementation of the safety sensor, verified by the initial test performed by a competent person
(see chapter 2.2 "Necessary competencies")
• Imparting all relevant information to the operating company
• Adhering to all regulations and directives for the safe commissioning of the machine
The operator of the machine is responsible for:
• Instructing the operator
• Maintaining the safe operation of the machine
• Adhering to all regulations and directives for labor protection and safety at work
• Periodic testing by a competent person (see chapter 2.2 "Necessary competencies")
2.4 Disclaimer
The liability of Leuze electronic GmbH + Co. KG is to be excluded in the following cases:
• Safety sensor is not used as intended.
• Safety notices are not adhered to.
• Reasonably foreseeable misuse is not taken into account.
• Mounting and electrical connection are not properly performed.
• Proper function is not tested (see chapter 9 "Testing").
• Changes (e.g., constructional) are made to the safety sensor.

Device description
Leuze electronic MLC 520S 10
3 Device description
The safety sensors from the MLC 500 series are active opto-electronic protective devices. They satisfy the
following standards:
MLC 500
Type in accordance with ENIEC61496 4
Category in accordance with ENISO13849 4
Performance Level (PL) in accordance with ENISO13849-1:2015 e
Safety Integrity Level (SIL) in accordance with IEC61508 and SILCL in ac-
cordance with ENIEC62061
3
The safety sensor consists of a transmitter and a receiver (see chapter 3.1 "Device overview of the MLC
family"). It is protected against overvoltage and overcurrent acc. to IEC60204-1 (protection class3). The
safety sensor is not dangerously influenced by ambient light (e.g., welding sparks, warning lights).
3.1 Device overview of the MLC family
The series consists of a transmitter and the corresponding receiver. An overview of the characteristic fea-
tures is given in the following table.
Tab.3.1: Device models in the series with specific features and functions
Transmitter Receiver
MLC 520S MLC 520S
OSSDs (2x) ■
LED indicator ■ ■
Automatic start/restart ■
RES ■
EDM ■
Protective field properties
The beam distance and the number of beams are dependent on the resolution and protective field height.
Device synchronization
The synchronization of receiver and transmitter for creating a functioning protective field is done optically,
i.e. without cables, via one specially coded synchronization beam. The synchronization beam is the beam
closest to the cable connection. A cycle (i.e. a pass from the first to the last beam) is called a scan.
3.2 Connection technology
The transmitter and receiver feature cables with M12 connectors as an interface to the machine control
with the following number of pins:
Device model Device type Device plug
MLC 520S Transmitter/receiver 5-pin

Device description
Leuze electronic MLC 520S 11
3.3 Cascading
To implement linked protective fields, up to three MLC safety light curtains can be cascaded one after the
other.
Adjacent protective fields, e.g., for stepping behind protection, can thereby be implemented without any ad-
ditional expense for control and connection. The master system performs all necessary processor tasks,
provides indicators and the receiver-side interfaces to the machine and command devices.
Devices with different resolutions can be combined.
To enable connection in cascade systems, cascade cables are available as accessories.
With mounting brackets, an L- or U-shaped fixed connection can be created (see chapter 15 "Order guide
and accessories").
Mounting instructions see chapter 6.3.2 "Mounting cascading".

Device description
Leuze electronic MLC 520S 12
3.4 Display elements
The display elements of the safety sensors simplify start-up and fault analysis.
3.4.1 Operation indicators on the MLC520S transmitter/receiver
Located on both the transmitter and receiver are six LEDs for displaying the operating state:
1
2
7
8
9 10
6
1
2
3
4
5
6
1 LED1
2 LED2
3 LED EDM/3
4 LED RES
5 OSSD LED
6 PWR LED
7 LED3
8 LED TX
9 Transmitter
10 Receiver
Fig.3.1: Indicators on the MLC 520S transmitter/receiver
Tab.3.2: Meaning of the LEDs on the transmitter
Operating
mode
LED indicator Description
NORMAL
OPERATION
Normal operation
LOCKOUT
ERROR
Internal error
Optical scan error
Cascade communication er-
ror
Reset error

Device description
Leuze electronic MLC 520S 13
Tab.3.3: Meaning of the LEDs on the receiver
Operating
mode
LED indicator Description
ALIGNMENT Alignment indicator
NORMAL
OPERATION
Normal operation – manual
reset
NORMAL
OPERATION
Normal operation
Safety status
EDM function enabled
LOCKOUT
ERROR
Internal error
Optical scanning error
EDM error
Cascade communication er-
ror
Restart function error
Safety-related switching
outputs error
Supply error

Functions
Leuze electronic MLC 520S 14
4 Functions
An overview of features and functions of the safety sensor can be found in chapter “Device descrip-
tion” (see chapter 3.1 "Device overview of the MLC family").
Overview of functions
• Start/restart interlock (RES)
• EDM
4.1 Start/restart interlock RES
After accessing the protective field, the start/restart interlock ensures that the safety sensor remains in the
OFF state after the protective field has been cleared. It prevents automatic release of the safety circuits
and automatic start-up of the system, e.g. if the protective field is again clear or if an interruption in the volt-
age supply is restored.
NOTICE
For access guarding, the start/restart interlock function is mandatory. The protective device may
only be operated without start/restart interlock in certain exceptional cases and under certain
conditions acc. to ISO12100.
WARNING
Deactivation of the start/restart interlock may result in serious injury!
ÄImplement the start/restart interlock on the machine or in a downstream safety circuit.
Using start/restart interlock
ÄWire the MLC 520S receiver appropriately for the desired function (see chapter 7 "Electrical connec-
tion").
The start/restart interlock function is activated or deactivated through appropriate wiring
Switching the safety sensor back on after shutting down (OFF state):
ÄPress the reset button (press/release between 0.15s and 4s)
NOTICE
The reset button must be located outside the danger zone in a safe place and give the operator
a good view of the danger zone so that he/she can check whether anyone is located in it (ac-
cording to IEC62046) before pressing the reset button.
DANGER
Risk of death if start/restart is operated unintentionally!
ÄEnsure that the reset button for unlocking the start/restart interlock cannot be reached from
the danger zone.
ÄBefore unlocking the start/restart interlock, make certain that no people are in the danger
zone.
After the reset button has been actuated, the safety sensor switches to the ON state.

Functions
Leuze electronic MLC 520S 15
4.2 EDM contactor monitoring
NOTICE
The contactor monitoring of the MLC 520S safety sensors can be activated through appropriate
wiring (see chapter 7 "Electrical connection")!
The “contactor monitoring” function monitors the contactors, relays or valves connected downstream of the
safety sensor. Prerequisite for this are switching elements with positive-guided feedback contacts (normally
closed contacts).
Implement the contactor monitoring function:
• through appropriate wiring of the MLC 520S safety sensors (see chapter 7 "Electrical connection").
• through the external contactor monitoring of the downstream safety relay, (e.g. MSI series from Leuze
electronic)
• or through contactor monitoring of the downstream safety PLC (optional, integrated via a safety bus)
If contactor monitoring is activated (see chapter 7 "Electrical connection"), it operates dynamically, i.e., in
addition to monitoring the closed feedback circuit every time before the OSSDs are switched on, it also
checks whether the release of the feedback circuit opened within 350ms and, after the OSSDs are
switched off, whether it has closed again within 350ms. If this is not the case, the OSSDs return to the
OFF state after being switched on briefly. An error message is displayed (see chapter 11 "Troubleshoot-
ing"). The receiver switches to the fault interlock state from which it can only be returned to normal opera-
tion by switching the supply voltage off and back on again.

Applications
Leuze electronic MLC 520S 16
5 Applications
The safety sensor only creates square protective fields.
5.1 Point of operation guarding
Point of operation guarding for hand and finger protection is typically the most common application for this
safety sensor. In accordance with ENISO13855, resolutions from 14to40mm make sense here. This
yields the necessary safety distance, among others (see chapter 6.1.1 "Calculation of safety distanceS").
Fig.5.1: Point of operation guarding protects reaching into the danger zone, e.g. for cartoners or filling systems
Fig.5.2: Point of operation guarding protects reaching into the danger zone, e.g. for a pick&place robot applica-
tion

Mounting
Leuze electronic MLC 520S 17
6 Mounting
WARNING
Improper mounting may result in serious injury!
The protective function of the safety sensor is only ensured if appropriately and professionally
mounted for the respective, intended area of application.
ÄOnly allow the safety sensor to be installed by qualified persons (see chapter 2.2 "Neces-
sary competencies").
ÄMaintain the necessary safety distances (see chapter 6.1.1 "Calculation of safety dis-
tanceS").
ÄMake sure that stepping behind, crawling under or stepping over the protective device is reli-
ably ruled out and reaching under, over or around is taken into account in the safety dis-
tance, if applicable with additional distanceCRO corresponding to ISO13855.
ÄTake measures to prevent that the safety sensor can be used to gain access to the danger
zone, e.g. by stepping or climbing into it.
ÄObserve the relevant standards, regulations and these instructions.
ÄClean the transmitter and receiver at regular intervals: environmental conditions (see chap-
ter 14 "Technical data"), care (see chapter 10 "Maintenance").
ÄAfter mounting, check the safety sensor for proper function.
6.1 Arrangement of transmitter and receiver
Optical protective devices can only perform their protective function if they are mounted with adequate
safety distance. When mounting, all delay times must be taken into account, such as the response times of
the safety sensor and control elements as well as the stopping time of the machine, among others.
The following standards specify calculation formulas:
• IEC61496-2, "Active optoelectronic protective devices": distance of the reflecting surfaces/deflecting
mirrors
• ISO13855, "Safety of machines - The positioning of protective equipment in respect of approach
speeds of parts of the human body": mounting situation and safety distances
NOTICE
In accordance with ISO13855, with a vertical protective field, it is possible to pass under beams
over 300mm or pass over beams under 900mm. If the protective field is horizontal, climbing on
the safety sensor must be prevented through suitable installation or with covers and the like.
6.1.1 Calculation of safety distanceS
General formula for calculating the safety distanceS of an Optoelectronic Protective Device acc. to
ISO13855
S [mm] = Safety distance
K [mm/s] = Approach speed
T [s] = Total time of the delay, sum from (ta+ti+tm)
ta[s] = Response time of the protective device
ti[s] = Response time of the safety relay
tm[s] = Stopping time of the machine
C [mm] = Additional distance to the safety distance

Mounting
Leuze electronic MLC 520S 18
NOTICE
If longer stopping times are determined during regular inspections, an appropriate additional
time must be added to tm.
6.1.2 Calculation of safety distance if protective fields act orthogonally to the approach direction
With vertical protective fields, ISO13855 differentiates between
• SRT: safety distance concerning access through the protective field
• SRO: safety distance concerning access over the protective field
The two values are distinguished by the way additional distanceC is determined:
• CRT: from a calculation formula or as a constant (see chapter 6.1.1 "Calculation of safety distanceS")
• CRO: from the following table “Reaching over the vertical protective field of electro-sensitive protective
equipment (excerpt from ISO13855)”
The larger of the two values SRT and SRO is to be used.
Calculation of safety distanceSRT acc. to ISO13855 when access occurs through the protective
field:
Calculation of safety distanceSRT for point of operation guarding
SRT [mm] = Safety distance
K [mm/s] = Approach speed for point of operation guarding with approach reaction and normal approach di-
rection to the protective field (resolution 14to40mm): 2000mm/s or 1600mm/s, when
SRT>500mm
T [s] = Total time of the delay, sum from (ta+ti+tm)
ta[s] = Response time of the protective device
ti[s] = Response time of the safety relay
tm[s] = Stopping time of the machine
CRT [mm] = Additional distance for point of operation guarding with approach reaction with resolutions of
14to40mm, d=resolution of protective device CRT=8×(d-14)mm
Calculation of safety distanceSRo acc. to ISO13855 when protective field is accessed from above:
Calculation of safety distanceSRo for point of operation guarding
SRO [mm] = Safety distance
K [mm/s] = Approach speed for point of operation guarding with approach reaction and normal approach di-
rection to the protective field (resolution 14to40mm): 2000mm/s or 1600mm/s, when
SRO>500mm
T [s] = Total time of the delay, sum from (ta+ti+tm)
ta[s] = Response time of the protective device
ti[s] = Response time of the safety relay
tm[s] = Stopping time of the machine
CRO [mm] = Additional distance in which a body part can move towards the protective device before the pro-
tective device triggers: value (see the following table “Reaching over the vertical protective field
of electro-sensitive protective equipment (excerpt from ISO13855)”).

Mounting
Leuze electronic MLC 520S 19
a
3
CRO
KxT
b
1
2
SRO
1 Safety sensor
2 Danger zone
3 Floor
a Height of the point of operation
b Height of the upper beam of the safety sensor
Fig.6.1: Additional distance to the safety distance when reaching over and under
Tab.6.1: Reaching over the vertical protective field of electro-sensitive protective equipment(excerpt from
ISO13855)
Heighta
of the
point of
opera-
tion
[mm]
Heightb of the upper edge of the protective field of the electro-sensitive protective
equipment
900 1000 1100 1200 1300 1400 1600 1800 2000 2200 2400 2600
Additional distanceCRO to the danger zone [mm]
2600000000000000
2500 400 400 350 300 300 300 300 300 250 150 100 0
2400 550 550 550 500 450 450 400 400 300 250 100 0
2200 800 750 750 700 650 650 600 550 400 250 0 0
2000 950 950 850 850 800 750 700 550 400 0 0 0
1800 1100 1100 950 950 850 800 750 550 0 0 0 0
1600 1150 1150 1100 1000 900 850 750 450 0 0 0 0
1400 1200 1200 1100 1000 900 850 650 0 0 0 0 0
1200 1200 1200 1100 1000 850 800 0 0 0 0 0 0
1000 1200 1150 1050 950 750 700 0 0 0 0 0 0
800 1150 1050 950 800 500 450 0 0 0 0 0 0
600 1050 950 750 550 0 0 0 0 0 0 0 0
400 900 700 0 0 0 0 0 0 0 0 0 0
200 60000000000000
0 000000000000

Mounting
Leuze electronic MLC 520S 20
Depending on the specified values you can work with the above-mentioned table in three ways:
1. Given are:
• Heighta of the point of operation
• DistanceS of the point of operation from the safety sensor, and additional distanceCRO
To be determined is the required heightb of the upper beam of the safety sensor and thereby its protective
field height.
ÄLook for the line with the specification of the point of operation height in the left column.
ÄIn this line, look for the column with the next highest specification for additional distance CRO.
ðThe required height of the upper beam of the safety sensor is up top in the column head.
2. Given are:
• Heighta of the point of operation
• Heightb of the upper beam of the safety sensor
To be determined is the required distance S of the safety sensor to the point of operation and thereby addi-
tional distance CRO.
ÄIn the column head, look for the column with the next lowest entry for the height of the upper beam of
the safety sensor.
ÄLook for the line with the next highest specification of the point of operation heighta in this column.
ðIn the intersection point of the line and the column, you will find additional distanceCRO.
3. Given are:
• DistanceS of the point of operation from the safety sensor, and additional distanceCRO.
• Heightb of the upper beam of the safety sensor
To be determined is the permitted heighta of the point of operation.
ÄIn the column head, look for the column with the next lowest entry for the height of the upper beam of
the safety sensor.
ÄLook for the next lowest value for real additional distance CRO in this column.
ðIn this line, go to the left column: here you will find the permitted height of the point of operation.
ÄNow calculate safety distanceS using the general formula acc. to ISO13855 (see chapter 6.1.1 "Cal-
culation of safety distanceS").
ðThe larger of the two values SRT and SRO is to be used.