Leuze electronic MLC 530 User manual

MLC 530
Safety light curtains
SAFE IMPLEMENTATION AND OPERATION
Original operating instructions
EN 2013/09 - 700141 We reserve the right to make technical changes

Leuze electronic MLC 530 2
© 2013
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 3
1 About this document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Used symbols and signal words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Approved purpose and foreseeable improper operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.1 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1.2 Foreseeable misuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Competent persons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Responsibility for safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Device overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Connection technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 Display elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.1 Operating indicators on the MLC 500 transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.2 Operating indicators on the MLC 530 receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.3 Alignment display. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Start/restart interlock RES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 EDM contactor monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.3 Transmission channel changeover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4 Range reduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5 Scan mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6 Linkage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.1 Contact-based safety circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6.2 Linking of electronic safety-related switching outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.7 Blanking, reduced resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.1 Fixed blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.2 Floating blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.7.3 Controlling blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.7.4 Reduced resolution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8 Timing controlled muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.8.1 Partial muting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.8.2 Muting restart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.8.3 Muting override . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.9 Error reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1 Point of operation guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.1.1 Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2 Access guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.2.1 Muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.3 Danger zone guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1 Arrangement of transmitter and receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1.1 Calculation of safety distance S. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1.2 Calculation of safety distance SRT or SRO if protective fields act orthogonally to the approach
direction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
6.1.3 Calculation of safety distance S for parallel approach to the protective field. . . . . . . . . . . . . . . . . . 37
6.1.4 Minimum distance to reflective surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

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6.1.5 Resolution and safety distance for fixed and floating blanking as well as reduced resolution. . . . . 40
6.1.6 Preventing mutual interference between adjacent devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
6.2 Arrangement of the muting sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.2.1 Basic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.2.2 Selecting optoelectronic muting sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.2.3 Minimum distance for optoelectronic muting sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.2.4 Arrangement of the muting sensors for timing controlled 2-sensor muting . . . . . . . . . . . . . . . . . . . 44
6.2.5 Arrangement of the muting sensors for timing controlled 2-sensor muting especially for exit
applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.3 Mounting the safety sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.3.1 Suitable mounting locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.3.2 Definition of directions of movement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.3.3 Fastening via BT-NC60 sliding blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.3.4 Fastening with BT-R swivel mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.3.5 One-sided mounting on the machine table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.4 Mounting accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.4.1 AC-SCM8 sensor connection module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.4.2 Deflecting Mirror for multiple-side guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.4.3 MLC-PS protective screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.1 Pin assignment transmitter and receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.1.1 MLC 500 transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.1.2 MLC 530 receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
7.2 AC-SCM8 sensor connection module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.3 Operating mode 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
7.4 Operating mode 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
7.5 Operating mode 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.6 Operating mode 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
7.7 Operating mode 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8 Starting up the device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.1 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.2 Aligning the sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.3 Aligning of Deflecting Mirrors with the laser alignment aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.4 Unlocking start/restart interlock, muting restart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.5 Teaching of fixed blanking areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.6 Teaching of floating blanking areas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
9 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
9.1 Before the initial start-up and following modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
9.1.1 Checklist - to be performed prior to the initial start-up and following modifications . . . . . . . . . . . . . 71
9.2 To be performed periodically by competent persons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
9.3 Daily or at change of shift by the operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
9.3.1 Check list – daily or at change of shift . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
10 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
11 Rectifying the fault . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
11.1 What to do in case of failure? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
11.2 Operating displays of the LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
11.3 Error messages 7-segment display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.4 Muting indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

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12 Disposing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
13 Service and support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
14 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
14.1 General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
14.2 Dimensions, weight, response time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
14.3 Dimensional drawings: accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
15 Ordering information and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
16 EC Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

About this document
Leuze electronic MLC 530 6
1 About this document
1.1 Used symbols and signal words
Table 1.1: Warning symbols and signal words
Table 1.2: Other symbols
Table 1.3: Terms and abbreviations
Symbol indicating dangers to persons
NOTICE 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 injury
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.
Symbol for tips
Text passages with this symbol provide you with further information.
Symbols for action steps
Text passages with this symbol instruct you to perform actions.
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)
EDM Contactor monitoring
(External Device Monitoring)
FG Function group
Function Group
LED LED, display element in transmitter and receiver
MS1, MS2 Muting sensor 1, 2
MLC Brief description of the safety sensor, consisting of transmitter and receiver
MTTFdMean time to a dangerous failure
(Mean Time To dangerous Failure)
Muting Temporary automatic suppression of the safety functions
OSSD Safety-related switching output
(Output Signal Switching Device)

About this document
Leuze electronic MLC 530 7
1.2 Checklists
The checklists (see chapter 9) serve as a reference for the machine manufacturer or supplier. They
replace neither testing of the complete machine or system prior to the initial start-up nor their periodic
testing by a competent person. The checklists contain minimum testing requirements. Depending on the
application, other tests may be necessary.
PFHdProbability of a dangerous Failure per Hour
Probability of dangerous Failure per Hour
PL Performance Level
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
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)

Safety
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2 Safety
Before using the safety sensor, a risk assessment must be performed according to valid standards (e.g.
EN ISO 12100, EN ISO 13849-1, IEC 61508, EN IEC 62061). The result of the risk assessment deter-
mines the required safety level of the safety sensor (see table 14.2). For mounting, operating and testing,
this document as well as all applicable national and international standards, regulations, rules and direc-
tives must be observed. Relevant and supplied documents must be observed, printed out and handed to
affected persons.
Before working with the safety sensor, completely read and understand the documents applicable to
your task.
In particular, the following national and international legal regulations apply for the start-up, technical
inspections and work with safety sensors:
• Machinery directive 2006/42/EC
• Low voltage directive 2006/95/EC
• EMC directive 2004/108/EC
• 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
• Industrial safety regulation and employment protection act
• Product Safety Law (ProdSG)
2.1 Approved purpose and foreseeable improper operation
For safety-related information you may also contact the local authorities (e.g., industrial inspec-
torate, employer's liability insurance association, labor inspectorate, occupational safety and
health authority).
WARNING
A running machine may result in serious injury!
Make certain that the safety sensor is correctly connected and that the protective function of the pro-
tective device is ensured.
Make certain that, during all conversions, maintenance work and inspections, the system is securely
shut down and protected against being restarted.

Safety
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2.1.1 Proper use
• The safety sensor may only be used after it has been selected in accordance with the respectively
applicable 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).
• 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 table 14.2).
• The safety sensor protects persons or body parts at points of operation, danger zones or access
points of machines and plants.
• With the “access guarding” function, the safety sensor detects persons only when they enter the dan-
ger zone but cannot tell whether there are any persons inside the danger zone. For this reason, a
start/restart interlock 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).
• The safety sensor must be exchanged after a maximum of 20 years. Repairs or the exchange of
parts subject to wear and tear do not extend the service life.
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 Competent persons
Prerequisites for competent persons:
• They have a suitable technical education.
• They know the rules and regulations for occupational safety, safety at work and safety technology
and can assess the safety of the machine.
• They know the instructions for the safety sensor and the machine.
• They have been instructed by the responsible person on the mounting and operation of the machine
and of the safety sensor.1
2.3 Responsibility for safety
Manufacturer and operating company must ensure that the machine and implemented safety sensor func-
tion 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
• imparting all relevant information to the operating company
• adhering to all regulations and directives for the safe starting-up of the machine
1. They perform a task related to the subject matter shortly thereafter and keep their knowledge up to date through continuous
further training.

Safety
Leuze electronic MLC 530 10
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
• regular testing by competent persons
2.4 Disclaimer
Leuze electronic GmbH + Co. KG is not liable 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)
• changes (e.g., constructional) are made to the safety sensor

Device description
Leuze electronic MLC 530 11
3 Device description
The safety sensors from the MLC 500 series are active opto-electronic protective devices. They satisfy the
following standards:
The safety sensor consists of a transmitter and a receiver (see figure 3.1). It is protected against over-
voltage and overcurrent acc. to IEC 60204-1 (safety class 3). Its infrared beams are not influenced by
ambient light (e.g. welding sparks, warning lights).
3.1 Device overview
The series is characterized by three different receiver classes (Basic, Standard, Extended) with certain
features and properties (see table 3.1).
Table 3.1: Device models in the series with specific features and functions
Protective field properties
The beam distance and the number of beams are dependent on the resolution and protective field height.
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 e
Safety Integrity Level (SIL) in accordance with IEC 61508 and SILCL in
accordance with EN IEC 62061
3
Transmitter Receivers
Basic Standard Extended
MLC 500
MLC 501
MLC 510
MLC 511
MLC 520 MLC 530
OSSDs (2x) 
Transmission channel changeover 
LED display 
7-segment display 
Automatic start/restart 
RES 
EDM 
Linkage 
Blanking 
Muting 
Scan mode 
Range reduction 
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 figure 3.1 and see figure 14.1).

Device description
Leuze electronic MLC 530 12
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 (see chapter 4.5 „Scan mode“). 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).
a Optically active area, housed in yellow
b Synchronization beams
Figure 3.1: Transmitter-receiver system
QR code
A QR code as well as the corresponding web address are located on the safety sensor (see figure 3.2). At
the web address, you will find device information and error messages (see chapter 11.3 „Error messages
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.
Figure 3.2: QR code with corresponding web address (URL) on the safety sensor
3.2 Connection technology
The transmitter and receiver feature an M12 connector as an interface to the machine control with the
following number of pins:
For the correct synchronization and function of the safety sensor, at least one of the two synchro-
nization beams must be free during synchronization and operation.
a
b
b
Device version Device type Device plug
MLC 500 Transmitter 5-pin
MLC 530 Extended receiver 8-pin

Device description
Leuze electronic MLC 530 13
3.3 Display elements
The display elements of the safety sensors simplify start-up and fault analysis.
3.3.1 Operating indicators on the MLC 500 transmitter
Two LEDs for displaying the function are located on the connection cap.
1 LED1, green/red
2 LED2, green
Figure 3.3: Indicators on the MLC 500 transmitter
Table 3.2: Meaning of the LEDs
3.3.2 Operating indicators on the MLC 530 receiver
Three LEDs and a 7-segment display for visualizing the operating state are located on the receiver:
1
2
LED Color State Description
1 Green/red OFF Device switched off
red Device error
green Normal operation
2 green Flashing 10 s long after switch-on: reduced range selected by the
wiring of pin 4
OFF Transmission channel C1
ON Transmission channel C2

Device description
Leuze electronic MLC 530 14
1 LED1, red/green
2 LED2, yellow
3LED3, blue
4 OSSD icon
5 RES icon
6 Blanking/muting icon
7 7-segment display
Figure 3.4: Indicators on the MLC 530 receiver
Table 3.3: Meaning of the LEDs
14
5
6
2
7
3
LED Color State Description
1 Red/green OFF Device switched off
red OSSD off
Red slowly flashing
(approx. 1 Hz)
External fault
Red flashing fast
(approx. 10 Hz)
Internal fault
Green slowly flashing
(approx. 1 Hz)
OSSD on, weak signal
green OSSD on
2 yellow OFF • RES deactivated
• or RES activated and enabled
• or RES blocked and protective field inter-
rupted
ON RES activated and blocked but ready to be
unlocked - protective field free and linked sensor
is enabled if applicable
Flashing Upstream safety circuit opened
Flashing (1x or 2x) Changeover of the upstream control circuit
3 Blue OFF No special function (blanking, muting, …) active
ON Protective field parameter (blanking) correctly
taught
Slowly flashing Muting active
Short flashing • Teaching of protective field parameters
• or muting restart necessary
• or muting override active

Device description
Leuze electronic MLC 530 15
7-segment display
In normal operation, the 7-segment display shows the number of the operating mode (1-6). In addition, it
helps during the detailed error diagnostics (see chapter 11) and serves as an alignment aid (see
chapter 8.2 „Aligning the sensor“). In contrast to operating modes 1, 2 and 3, the 7-segment display is
rotated by 180 degrees in operating modes 4 and 6. This is because for many applications, the device
connection is located below the protective field, which is not the case in operating modes 1, 2 and 3.
Table 3.4: Meaning of the 7-segment display
For error diagnostics, the error's respective letter is displayed first followed by the number code. The
display is repeated cyclically. An AutoReset is carried out after 10 s for errors that do not cause locking,
with an unauthorized restart being impossible. 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 commissioning must be repeated (see chapter 9.1).
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.
3.3.3 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:
Table 3.5: Meaning of the alignment 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…6 Selected operating mode
For alignment
Alignment display (see table 3.5).
• 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
Segment Description
Switched on All beams in the beam area are free.
Flashing At least one, but not all beams in the beam area are free.
Switched off All beams in the beam area are interrupted.

Device description
Leuze electronic MLC 530 16
When the protective field has been free for about 5 s, the device switches back to the display of the oper-
ating mode.

Functions
Leuze electronic MLC 530 17
4 Functions
An overview of features and functions of the safety sensor can be found in chapter “Device description”
(see chapter 3.1 „Device overview“).
The different functions are grouped into six operating modes (see table 4.1).
Depending on the function required, select the suitable operating mode via corresponding electrical wiring
(see chapter 7 „Electrical connection“).
Table 4.1: Overview of functions and function groups (FG) in the individual operating modes
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
voltage supply is restored.
In operating modes 1, 2 and 3, which evaluate a contact-based safety circuit or a linkage of electronic
safety-related switching outputs, the internal start/restart interlock is deactivated.
Operating modes
Functions 12346
Fixed blanking without tolerance 
FG1,
FG2
Fixed blanking without tolerance, can be activated/
deactivated during operation

Fixed blanking with 1-beam tolerance 
Integration of “contact-based safety circuit”  FG1,
FG2
Integration of “electronic safety-related switching
outputs”

SingleScan  FG1
DoubleScan FG2
MaxiScan 
Floating blanking, can be changed to “Fixed
blanking” during operation
FG1
Reduced resolution, can be changed to “Fixed
blanking” during operation
FG1
Combination of Floating/Fixed blanking, can be
changed to “Fixed blanking” during operation
FG1
Timing controlled 2-sensor muting 
Partial muting (timing controlled 2-sensor muting) 
Start/restart interlock (RES) 
Range reduction 
Transmission channel changeover 
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.

Functions
Leuze electronic MLC 530 18
Use start/restart interlock
Select operating mode 4 or 6 (see chapter 7 „Electrical connection“)
The start/restart interlock function is automatically activated.
Switching the safety sensor back on after shutting down (OFF state):
Press the reset button (press/release between 0.1 s and 4 s)
After the reset button has been actuated, the safety sensor switches to the ON state.
4.2 EDM contactor monitoring
The MLC 530 safety sensor works in all operating modes without the EDM function.
In case you need this function:
Use a suitable Safety Relay.
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
(normal closed contacts).
4.3 Transmission channel changeover
Transmission channels are used to prevent mutual interference of safety sensors which are located close
to each other.
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:
Connect pins 1, 3, 4 and 8 of the receiver and switch it on.
The 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:
Repeat the procedure described above to again select transmission channel C1 on the receiver.
The receiver is switched to transmission channel C1 again.
WARNING
Deactivation of the start/restart interlock may result in serious injury in operating modes 1, 2 and 3!
 In operating modes 1, 2 and 3, implement the start/restart interlock on the machine or in a down-
stream safety circuit.
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 before
pressing the reset button.
DANGER
Risk of death if start/restart is operated unintentionally!
 Ensure that the reset button for unlocking the start/restart interlock cannot be reached from the danger
zone.
 Before unlocking the start/restart interlock, make certain that no people are in the danger zone.
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, there-
by do not influence the protective field.

Functions
Leuze electronic MLC 530 19
4.4 Range reduction
In addition to selecting the suitable transmission channels (see chapter 4.3 „Transmission channel
changeover“), the range reduction also serves to prevent mutual interference of adjacent safety sensors.
Activating the function reduces the light power of the transmitter so that around half of the nominal range
is reached.
Reducing range:
Wire pin 4 (see chapter 7.1 „Pin assignment transmitter and receiver“).
The wiring of pin 4 determines the transmitting power and thereby the range.
4.5 Scan mode
The safety sensor features three scan modes (see table 4.2). Depending on the operating mode selected
(see table 4.1), a certain scan mode is automatically set.
Table 4.2: Activation and characteristics of the three scan modes of the safety sensor
Faulty function due to incorrect transmission channel!
Select the same transmission channel on the transmitter and corresponding receiver.
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-rele-
vant monitoring.
 Do not use this configuration option for safety purposes.
Note 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 distance to reflective
surfaces“)
Only after an interruption of the protective field continues for several consecutive scans are the
OSSDs and thereby the downstream machine switched off. As a result, selecting the scan mode
can increase the availability (tolerance) at the expense of the response time - particularly in the
case of EMC disturbances, light physical shocks, brief protective field violations due to falling ob-
jects and the like.
Activation OSSD behavior Remarks
SingleScan Selection of operat-
ing mode 1, 2 or 3/
FG2
Switch-off directly after
every protective field vio-
lation detected
Fastest scan mode with shortest
response time
DoubleScan Selection of operat-
ing mode 3 / FG1
Switch-off in the case of
protective field violations
in two consecutive scans
Depending on the number of beams in
the protective field, a certain tolerance
time towards malfunctions exists. The
response time doubles compared to
SingleScan mode.
MaxiScan Selection of operat-
ing mode 4 or 6
Switch-off in the case of
protective field violations
in several consecutive
scans
The number of tolerable protective field
violations (MultiScan factor) is deter-
mined by the receiver to be the maxi-
mum possible value depending on the
number of beams, so that the maximum
response time is 99 ms (fixed value).

Functions
Leuze electronic MLC 530 20
4.6 Linkage
Through linkage, the behavior of the receiver can be controlled via a two-channel safety circuit (see
figure 7.9).
The upstream safety sensors and operational controls release the OSSDs of the receiver for safety-rele-
vant purposes if the control circuit has been switched as expected regarding polarity and time behavior
and the protective field is free.
The following upstream sensors and operational controls are possible regarding the linkage:
• Safety sensor with two-channel contact-based switching output (normal closed contact), e.g. Safety
Switch, E-Stop Rope Switch, Safety Position Switch and the like, see chapter 4.6.1 „Contact-based
safety circuit“.
• Safety sensor with two-channel electronic OSSD switching output, see chapter 4.6.2 „Linking of elec-
tronic safety-related switching outputs“.
E-Stop buttons connected to the receiver act only on the safety circuit to which the AOPD is assigned.
Thus, it can be considered to be an area E-Stop. The regulations for E-Stops apply to it, including those
in accordance with EN 60204-1 and EN ISO 13850, among others.
 In this case, observe the regulations for E-Stops.
If linkage is utilized, the response time of the linked device is extended by 3.5 ms.
Concerning the safety distance, place the more critical devices at the end of the electrical chain and as
close as possible to the downstream safety circuit.
4.6.1 Contact-based safety circuit
The function releases the OSSDs via an upstream two-channel contact-based safety circuit. It can be used
to monitor locks and the position of inserted objects in the event of fixed or floating blanking, e.g. via coded
plugs on short cables or via Safety Switches with separate actuators (see chapter 7.5 „Operating
mode 3“). This prevents an unwanted start-up when parts are removed from the protective field.
Examples for the connection can be found in chapter “Electrical connection” (see figure 7.6).
The safety sensor only switches on if the following conditions have been fulfilled:
• The protective field is free and blanked beams are interrupted.
• The safety circuit is closed or both contacts have been closed simultaneously within 0.5 s.
Activation of the function
The contact-based safety circuit can be used in operating modes 1, 2 and 3 (see chapter 7 „Electrical
connection“).
4.6.2 Linking of electronic safety-related switching outputs
This function is used to construct a serial connection of devices with electronic safety OSSD switching
outputs (see figure 7.9). The OSSDs of an upstream safety device release the OSSDs of the Safety Light
Curtain as the central safety device through 2 channels. The upstream safety device also monitors the
cross circuits. Regarding the downstream safety circuit, a linked system behaves like a single device, i.e.
only 2 inputs are necessary in the downstream Safety Relay.
Magnetically coded sensors may not be linked since the Safety Light Curtain does not monitor
them.
WARNING
Impairment of the protective function due to faulty signals
Series connection of devices with safety-related switching outputs (OSSDs) may only be created with the
following Leuze electronic safety sensors: SOLID-2/2E, SOLID-4/4E, MLD 300, MLD 500, MLC 300,
MLC 500, RS4, RD800 or COMPACT
plus .