Leuze MLC 530 SPG User manual

SAFE IMPLEMENTATION AND OPERATION
Original operating instructions
EN 2018/07 - 50132717 We reserve the right to make technical changes
MLC 530 SPG
Safety Light Curtains

© 2018
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 530 SPG 2

Table of contents
Leuze electronic MLC 530 SPG 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 Overview of Smart Process Gating (SPG)............................................................................ 10
3.2 Device overview of the MLC family....................................................................................... 10
3.3 Connection technology ......................................................................................................... 12
3.4 Display elements .................................................................................................................. 12
3.4.1 Operating indicators on the MLC500 transmitter..............................................................12
3.4.2 Operating indicators on the MLC530SPG receiver .........................................................13
3.4.3 Alignment display ..............................................................................................................15
4 Functions.............................................................................................................16
4.1 Start/restart interlock RES .................................................................................................... 16
4.2 Transmission channel changeover ....................................................................................... 17
4.3 Operating range selection..................................................................................................... 17
4.4 Signal output......................................................................................................................... 17
4.5 Blanking ................................................................................................................................ 18
4.5.1 Fixed blanking ...................................................................................................................18
4.6 Smart Process Gating........................................................................................................... 20
4.6.1 SPG prerequisites .............................................................................................................22
4.6.2 Examples of signal generation for SPG mode ..................................................................24
4.6.3 Operating mode1 (qualified stop) ..................................................................................... 24
4.6.4 Operating mode5..............................................................................................................26
4.6.5 Operating mode 6 (partial gating)......................................................................................27
4.6.6 SPG termination by the control .........................................................................................29
4.6.7 SPG timeout extension......................................................................................................29
4.6.8 Gating sequence reset ......................................................................................................30
4.6.9 SPG restart........................................................................................................................31
4.6.10 Override.............................................................................................................................32
4.7 Error reset............................................................................................................................. 32
5 Applications ........................................................................................................33
5.1 Access guarding with SPG ................................................................................................... 33
5.1.1 Blanking.............................................................................................................................34
6 Mounting..............................................................................................................35
6.1 Arrangement of transmitter and receiver .............................................................................. 35
6.1.1 Calculation of safety distanceS ........................................................................................35
6.1.2 Calculation of safety distance if protective fields act orthogonally to the approach direction...36
6.1.3 Calculation of safety distanceS for parallel approach to the protective field ....................41
6.1.4 Minimum distance to reflective surfaces ...........................................................................42
6.1.5 Resolution and safety distance during fixed blanking .......................................................43
6.1.6 Preventing mutual interference between adjacent devices ............................................... 44

Table of contents
Leuze electronic MLC 530 SPG 4
6.2 Mounting the safety sensor................................................................................................... 45
6.2.1 Suitable mounting locations ..............................................................................................46
6.2.2 Definition of directions of movement .................................................................................47
6.2.3 Fastening via BT-NC60 sliding blocks...............................................................................47
6.2.4 Fastening via BT-2HF swivel mount..................................................................................48
6.2.5 Fastening via BT-2SB10 swiveling mounting brackets .....................................................48
6.2.6 One-sided mounting on the machine table........................................................................49
7 Electrical connection..........................................................................................50
7.1 Pin assignment transmitter and receiver .............................................................................. 51
7.1.1 MLC500 transmitter..........................................................................................................51
7.1.2 MLC530SPG receiver .....................................................................................................53
7.2 Operating mode1 (SPG with qualified stop function)........................................................... 53
7.3 Operating mode5 ................................................................................................................. 55
7.4 Operating mode 6 (partial gating) ......................................................................................... 57
8 Starting up the device ........................................................................................59
8.1 Switching on ......................................................................................................................... 59
8.2 Aligning the sensor ............................................................................................................... 59
8.3 Acknowledgement button ..................................................................................................... 60
8.3.1 Unlocking start/restart interlock .........................................................................................60
8.3.2 SPG restart and override...................................................................................................61
8.4 Teaching of fixed blanking areas .......................................................................................... 62
9 Testing .................................................................................................................63
9.1 Before the initial start-up and following modifications........................................................... 63
9.1.1 Checklist for integrator – to be performed prior to the initial start-up and following modifications .... 63
9.2 Regularly by qualified persons.............................................................................................. 65
9.3 Periodically by the operator .................................................................................................. 65
9.3.1 Checklist – periodically by the operator.............................................................................66
10 Maintenance ........................................................................................................67
11 Troubleshooting..................................................................................................68
11.1 What to do in case of failure? ............................................................................................... 68
11.2 Operating indicators of the LEDs.......................................................................................... 68
11.3 Error messages 7-segment display ...................................................................................... 69
12 Disposal ...............................................................................................................74
13 Service and support ...........................................................................................75
14 Technical data .....................................................................................................76
14.1 General specifications .......................................................................................................... 76
14.2 Dimensions and weights....................................................................................................... 78
14.3 Dimensioned drawings: Accessories .................................................................................... 80
15 Order guide and accessories.............................................................................83
16 EC Declaration of Conformity............................................................................89

About this document
Leuze electronic MLC 530 SPG 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
AOPD Active Optoelectronic Protective Device
(Active Optoelectronic Protective Device)
Blanking Deactivation of the protective function of individual beams or beam areas with
monitoring for interruption
CS Switching signal from a control
(Controller Signal)
FG Function group
(Function Group)
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 530 SPG 6
PFHdProbability of a dangerous failure per hour
(Probability of dangerous Failure per Hour)
PFI (Protection Field Interrupted)
PL Performance Level
P-mode Protective mode
Reduced resolution Reduction of the detection capability of the protective field without monitoring
for tolerating small objects in the protective field
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
SPG Smart Process Gating
TH Timer halt signal
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 530 SPG 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:
• Machinery directive 2006/42/EC
• Low voltage directive 2014/35/EU
• EMC directive 2014/30/EU
• Use of work equipment 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.
• 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.
• 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.

Safety
Leuze electronic MLC 530 SPG 8
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 suitably qualified 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.
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 530 SPG 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
• 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 530 SPG 10
3 Device description
The safety sensor consists of a transmitter and a receiver (see chapter 3.2 "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 Overview of Smart Process Gating (SPG)
SPG is a timing-controlled control process for access guarding with bridging function. External muting sen-
sors are not necessary here. Instead, two independent control signals are needed for activation of the
bridging function:
• A CS switching signal (“controller signal”) from a control (see chapter 4.6 "Smart Process Gating").
• A protective field interruption(PFI) which was created by the transport material; this interruption must
be detected by the receiver within 4s after the CS signal is applied.
The CS switching signal can be supplied by a standard PLC or by a safety PLC, whereby various safety
levels are reached (see following table).
Tab.3.1: Dependence of the safety level on the used control
Safety Integrity Level in accor-
dance with ENIEC62061
Performance level in accor-
dance with
ENISO13849-1:2008
Standard PLC SIL2 PLd
Safety PLC SIL3 PLe
3.2 Device overview of the MLC family
The series is characterized by four different receiver classes (Basic, Standard, Extended, SPG) with spe-
cific features and properties (see table below).
Tab.3.2: Device models in the series with specific features and functions
Device type Transmitter Receiver
Function
package
Basic Standard Ex-
tended
SPG
Model MLC 500
MLC 501
MLC 500/
A
MLC 502 MLC 510
MLC 511
MLC 510/
A
MLC 520 MLC 530 MLC 530
SPG
OSSDs (2x) ■ ■ ■ ■
AS-i ■ ■
Transmission
channel
changeover
■ ■ ■ ■ ■ ■
LED indicator ■ ■ ■ ■ ■ ■ ■ ■
7‑segment
display
■■■
Automatic
start/restart
■ ■ ■
RES ■ ■ ■
EDM ■
Linkage ■
Blanking ■ ■
Muting ■

Device description
Leuze electronic MLC 530 SPG 11
Device type Transmitter Receiver
Function
package
Basic Standard Ex-
tended
SPG
Model MLC 500
MLC 501
MLC 500/
A
MLC 502 MLC 510
MLC 511
MLC 510/
A
MLC 520 MLC 530 MLC 530
SPG
SPG ■
Multi-scan ■ ■
Range reduc-
tion
■ ■
Test input ■
Protective field properties
The beam distance and the number of beams are dependent on the resolution and protective field height.
NOTICE
Depending on the resolution, the effective protective field height can be larger than the optically
active area of the safety sensor housed in yellow (see chapter 3.2 "Device overview of the MLC
family" and see chapter 14.1 "General specifications").
Device synchronization
The synchronization of receiver and transmitter for creating a functioning protective field is done optically,
i.e. without cables, via two specially coded synchronization beams. A cycle (i.e. a pass from the first to the
last beam) is called a scan. The length of a scan determines the length of the response time and affects the
calculation of the safety distance (see chapter 6.1.1 "Calculation of safety distanceS").
NOTICE
For the correct synchronization and function of the safety sensor, at least one of the two syn-
chronization beams must be free during synchronization and operation.
During the SPG process, an interruption of up to 60s is possible (see chapter 4.6 "Smart
Process Gating").
a
b
b
a Optically active area, housed in yellow
b Synchronization beams
Fig.3.1: Transmitter-receiver system

Device description
Leuze electronic MLC 530 SPG 12
QR code
A QR code as well as the corresponding web address are located on the safety sensor.
At the web address, you will find device information and error messages (see chapter 11.3 "Error mes-
sages 7-segment display") after scanning the QR code with a mobile end device or after entering the web
address.
When using mobile end devices, mobile service charges can accrue.
Fig.3.2: QR code with corresponding web address (URL) on the safety sensor
3.3 Connection technology
The transmitter and receiver feature an M12 connector as an interface to the machine control with the fol-
lowing number of pins:
Device model Device type Device plug
MLC 500 Transmitter 5-pin
MLC 530 SPG Extended receiver, Smart Process
Gating
8-pin
3.4 Display elements
The display elements of the safety sensors simplify start-up and fault analysis.
3.4.1 Operating indicators on the MLC500 transmitter
Located in the connection cap on the transmitter are two LEDs which serve as function indicators:
1
2
1 LED1, green/red
2 LED2, green
Fig.3.3: Indicators on the MLC 500 transmitter

Device description
Leuze electronic MLC 530 SPG 13
Tab.3.3: Meaning of the LEDs on the transmitter
LED Color State Description
1 Green/red OFF Device switched off
Red Device error
Green Normal operation
2 Green Flashing For 10s after switch-on: reduced
range selected by the wiring (see
chapter 7.1 "Pin assignment trans-
mitter and receiver").
OFF Transmission channel C1
ON Transmission channel C2
3.4.2 Operating indicators on the MLC530SPG receiver
Three LEDs and a 7-segment display for visualizing the operating state are located on the receiver:
14
5
6
2
7
3
1 LED1, red/green
2 LED2, yellow
3 LED3, blue
4 OSSD icon
5 RES icon
6 Blanking/SPG icon
7 7‑segment display
Fig.3.4: Indicators on the MLC 530 SPG receiver
Tab.3.4: Meaning of the LEDs on the receiver
LED Color State Description
1 Red/green OFF Device switched off
Red OSSD off
Red, flashing slowly (approx.1Hz) External error
Red, flashing fast (approx.10Hz) Internal error
Green OSSD on

Device description
Leuze electronic MLC 530 SPG 14
LED Color State Description
2 Yellow OFF • RES activated and enabled
• or RES blocked and protective
field interrupted
ON, OSSD off RES activated and blocked but
ready to be unlocked - protective
field free
ON, OSSD on CS switching signal is applied
3 Blue OFF No special function (blanking,
SPG,…) active
ON Protective field parameter (blank-
ing) correctly taught
Slowly flashing • SPG active
• or override active
Short flashing Protective field interrupted and
RES blocked
• Teaching of protective field pa-
rameters
• or restart/override necessary
7‑segment display
In normal operation, the 7-segment display shows the number of the operating mode. In addition, it helps
during the detailed error diagnostics (see chapter 11 "Troubleshooting") and serves as an alignment aid
(see chapter 8.2 "Aligning the sensor").
Tab.3.5: Meaning of the 7-segment display
Display Description
After switching on
8 Self test
tnn Response time (t) of the receiver in milliseconds (nn)
In normal operation
1, 5 or 6 Selected operating mode
1, 5 or 6 flashing Weak signal
For alignment
Alignment display (see chapter 3.4.3 "Alignment display").
• Segment1: beam area in upper third of the protective field
• Segment2: beam area in middle third of the protective field
• Segment3: beam area in lower third of the protective field
For error diagnostics
F… Failure, internal device error
E… Error, external error
U… Usage info, application error
For error diagnostics, the error's respective letter is displayed first followed by the number code. The dis-
play is repeated cyclically. In the case of blocking errors, the voltage supply must be separated and the
cause of the error must be eliminated. Before switching on again, the steps taken before initial commission-
ing must be repeated (see chapter 9.1 "Before the initial start-up and following modifications").

Device description
Leuze electronic MLC 530 SPG 15
The 7-segment display switches to alignment mode when the device has not yet been aligned or when the
protective field has been interrupted (after 5s). In this case, a fixed beam area from the protective field is
assigned to every segment.
3.4.3 Alignment display
Approximately 5s after a protective-field interruption, the 7-segment display switches to alignment mode.
In this mode, one third of the total protective field (top, middle, bottom) is assigned to one of the three hori-
zontal segments and the state of this sub-protective field displayed as follows:
Tab.3.6: Function of alignment display
Segment Description
On All beams in the beam area are uninterrupted.
Flashing At least one, but not all beams in the beam area are uninterrupted.
Switched off All beams in the beam area are interrupted.
When the protective field has been free for about 5s, the device switches back to the display of the operat-
ing mode.

Functions
Leuze electronic MLC 530 SPG 16
4 Functions
An overview of features and functions of the safety sensor can be found in chapter “Device descrip-
tion” (see chapter 3.2 "Device overview of the MLC family").
The different functions are grouped into several operating modes (see table below).
Depending on the function required, select the suitable operating mode via corresponding electrical wiring
(see chapter 7 "Electrical connection").
Tab.4.1: Overview of functions and function groups (FG) in the individual operating modes
Operating modes
Functions 1 5 6
Fixed blanking with 1-beam tolerance ■ ■ ■
MaxiScan ■ ■ ■
SPG ■ ■ ■
Qualified stop ■ ■
Start/restart interlock (RES) ■ ■ ■
Range reduction ■ ■ ■
Transmission channel changeover ■ ■ ■
Partial gating ■
Max. conveyor speed 0.2m/s 0.6m/s 0.2m/s
Automatic gating end 2s 1s 2 s
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 ENISO12100.
Using start/restart interlock
ÄSelect the desired operating mode (see chapter 7 "Electrical connection").
The start/restart interlock function is automatically activated.
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 EN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.

Functions
Leuze electronic MLC 530 SPG 17
After the reset button has been actuated, the safety sensor switches to the ON state.
4.2 Transmission channel changeover
Transmission channels are used to prevent mutual interference of safety sensors which are located close
to each other.
NOTICE
To guarantee reliable operation, the infrared beams are modulated so they can be discerned
from the ambient light. Welding sparks or warning lights, e.g. from passing high-lift trucks,
thereby do not influence the protective field.
With the factory setting, the safety sensor works in all operating modes with transmission channelC1.
The transmission channel of the transmitter can be switched by changing the supply voltage polarity (see
chapter 7.1.1 "MLC500 transmitter").
Select transmission channelC2 on the receiver:
ÄConnect pins 1, 3, 4 and 8 of the receiver and switch it on.
ðThe receiver is switched to transmission channelC2. Switch the receiver off and again disconnect the
connection between pins 1, 3, 4 and 8 before switching the receiver back on.
Re-select transmission channelC1 on the receiver:
ÄRepeat the procedure described above to again select transmission channel C1 on the receiver.
ðThe receiver is switched to transmission channelC1 again.
NOTICE
Faulty function due to incorrect transmission channel!
Select the same transmission channel on the transmitter and corresponding receiver.
4.3 Operating range selection
In addition to selecting the suitable transmission channels (see chapter 4.2 "Transmission channel
changeover"), the operating range selection also serves to prevent mutual interference of adjacent safety
sensors. At reduced operating range the light power of the transmitter reduces, so that around half of the
nominal range is reached.
ÄWire pin4 (see chapter 7.1 "Pin assignment transmitter and receiver").
ðThe wiring of pin4 determines the transmitting power and thereby the range (without wiring pin4 the
reduced operating range is selected).
WARNING
Impairment of the protective function due to incorrect transmitting power!
The light power emitted from the transmitter is reduced through a single channel and without
safety-relevant monitoring.
ÄDo not use this configuration option for safety purposes.
ÄNote that the distance to reflective surfaces must always be selected so that no reflection
bypass can occur even at maximum transmitting power (see chapter 6.1.4 "Minimum dis-
tance to reflective surfaces").
4.4 Signal output
The signal output outputs 24 V on a valid gating sequence. Flashing occurs in the event of a faulty gating
sequence, e.g., if no protective field violation occurs after 4 s.

Functions
Leuze electronic MLC 530 SPG 18
4.5 Blanking
Blanking functions are used when objects must be located in the protective field for operational reasons.
NOTICE
If the “blanking” function is activated, suitable objects must be located within their respective
protective field areas. Otherwise the OSSDs switch to the OFF state even if the protective field
is free or they remain in the OFF state.
WARNING
Faulty application of blanking functions may result in serious injury!
ÄOnly use the function when the objects introduced do not have glossy or reflective top and/
or bottom surfaces. Only matte surfaces are permitted.
ÄMake sure that objects take up the entire width of the protective field so that the protective
field cannot be accessed from the sides of the objects; otherwise the safety distance with re-
duced resolution must be calculated corresponding to the gap in the protective field.
ÄIf necessary, properly mount mechanical locks which are fixed firmly to the object (see chap-
ter 14.1 "General specifications") to prevent the “formation of shadows”, for example from
tall objects or crooked installation.
ÄMonitor the position of the objects and the locks, if applicable, at all times by integrating
them electrically into the safety circuit.
ÄBlankings in the protective field and changes to the protective field resolution should only be
performed by qualified and instructed persons (see chapter 2.2 "Necessary competencies").
ÄOnly give corresponding tools such as a key for the teach key switch to qualified personnel.
4.5.1 Fixed blanking
With the “Fixed blanking” function, the safety sensor offers the chance of stationarily blanking up to 10pro-
tective field areas consisting of any number of adjacent beams.
Prerequisites:
• At least one of the two synchronization beams may not be blanked.
• Taught blanking areas must have a minimum distance to each other which corresponds to the resolu-
tion of the safety sensor.
• No “shadows” may form in the protective field (see figures below).
Fixed blanking with beam tolerance
Fixed blanking with beam tolerance is used for access guarding, for example to blank a roller conveyor so
that it is resistant to interference.
In doing so, the receiver automatically applies a tolerance area of one beam on both sides of a taught fixed
object, thereby expanding the movement area of the object by +1beam. On the borders of the blanked ob-
ject, the resolution is reduced correspondingly by 2beams.
Activation of the function
Select operating mode1, 5 or6 (see chapter 7 "Electrical connection").
Fig.4.1: Fixed blanking: mechanical locks prevent side access to the protective field

Functions
Leuze electronic MLC 530 SPG 19
Fig.4.2: Fixed blanking: prevention of formation of "shadows"
Teaching of fixed blanking areas
Teaching protective field areas with blanking is performed via a key switch in the following steps:
ÄMount all objects to be blanked in the protective field in the locations at which they are to be blanked.
ÄPress the teach key switch and release it within 0.15s and 4s.
ðThe teach event begins. LED3 flashes blue.
ÄPress the teach key switch again and release it within 0.15s and 4s.
ðThe teach event ends. LED3 illuminates blue if at least one beam area is blanked. All objects have
been correctly taught.
NOTICE
After teaching a free protective field (teaching finished), thus determining a protective field with-
out areas with fixed blanking, the blue LED switches off.
During teaching, the object size detected can vary by no more than one beam. Otherwise teaching is
ended with the U71 user message (see chapter 11.1 "What to do in case of failure?").

Functions
Leuze electronic MLC 530 SPG 20
4.6 Smart Process Gating
SPG is a timing-controlled control process for access guarding with bridging function. It is used only for ma-
terial transport out of or into danger zones.
External muting sensors are replaced by two independent control signals to activate the bridging function:
• A CS switching signal (“controller signal”) from a control.
• A PFI interruption signal from the protective field which was created by the transport material; this sig-
nal must be detected by the receiver within 4s after the CS switching signal is applied.
CS
PFI
SPG active
t1 t2
DD
CS Switching signal from the PLC
PFI Protective field interrupted
SPG
active
Gating active
t1 t < 4s
t2 t = 1s or 2s
D < 200mm
Fig.4.3: SPG principle