Leuze MLD 300 User manual

MLD 300, MLD 500
Multiple light beam safety devices
SAFE IMPLEMENTATION AND OPERATION
Original operating instructions
EN 2016/02 - 607342 We reserve the right to make technical changes

Leuze electronic MLD 300, MLD 500 2
© 2016
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 MLD 300, MLD 500 3
1 About this document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Used symbols and signal words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Checklists . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Intended use and foreseeable misuse. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.1 Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1.2 Using the laser alignment aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1.3 Foreseeable misuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Necessary competencies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Responsibility for safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Exemption of liability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Device overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Connection technology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2.1 AS-i parameter port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Display elements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.1 Operating indicators on the transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.3.2 Operation indicators on the receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.3.3 7-segment display at the receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.3.4 Multicolor indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4 Integrated laser alignment aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1 Start/restart interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2 Contactor monitoring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3 Signal output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.4 Range switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.5 MultiScan mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6 Periodic function test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.7 Muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.1 Timing controlled 2-sensor muting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.7.2 Sequence controlled 2-sensor muting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7.3 Timing controlled 4-sensor muting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7.4 Muting timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.7.5 Muting restart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.7.6 Alternative connection for second muting signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.7.7 Muting-enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.7.8 Partial muting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.7.9 Muting operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 Access guarding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6 Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.1 Arrangement of transmitter and receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.1.1 Arrangement of 1-beam safety sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6.1.2 Beam heights and ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1.3 Calculating the safety distance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.1.4 Calculation of the safety distance for vertical protective fields with reaching over . . . . . . . . . . . . . 33
6.1.5 Minimum distance to reflective surfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
6.1.6 Preventing mutual interference between adjacent devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.2 Arrangement of the muting sensors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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6.2.1 Basic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.2.2 Selecting optoelectronic muting sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.2.3 Minimum distance for optoelectronic muting sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.2.4 Arrangement of the muting sensors for timing controlled 2-sensor muting . . . . . . . . . . . . . . . . . . . 38
6.2.5 Arrangement of the muting sensors for sequence controlled 2-sensor muting . . . . . . . . . . . . . . . . 40
6.2.6 Arrangement of the muting sensors for timing controlled 4-sensor muting . . . . . . . . . . . . . . . . . . . 42
6.3 Mounting the safety sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.3.1 Suitable mounting locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.3.2 Swivel mount BT-SET-240 (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.3.3 BT-P40 clamp bracket (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7 Electrical connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.1 Pin assignment transmitter and receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.1.1 Standard pin assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.1.2 Pin assignment of local socket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
7.1.3 AS-i pin assignment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7.1.4 AS-i signal assignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
7.2 Selecting contactor monitoring and start/restart interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7.3 Selecting the muting operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
7.3.1 Operating mode 1 (muting):. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
7.3.2 Operating mode 2 (muting timeout 100 h): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
7.3.3 Operating mode 3 (sequence controlled 2-sensor muting):. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
7.3.4 Operating mode 4 (sequence controlled 2-sensor muting with muting timeout 100 h):. . . . . . . . . . 59
7.3.5 Operating mode 5 (muting-enable):. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
7.3.6 Operating mode 6 (partial muting): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8 Starting up the device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.1 Switching on . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.2 AS-i connection start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.2.1 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.2.2 Exchange of AS-i slaves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
8.3 Aligning the safety sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
8.4 Aligning without integrated laser alignment aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8.5 Aligning with integrated laser alignment aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8.5.1 Required devices and tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.5.2 Aligning without UDC device columns and without UMC deflecting mirror columns . . . . . . . . . . . . 66
8.5.3 Aligning with UDC device columns and with UMC deflecting mirror columns . . . . . . . . . . . . . . . . . 68
8.6 Start/restart button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.6.1 Unlocking start/restart interlock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
8.6.2 Muting restart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
9 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
9.1 Before the initial start-up and following modifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
9.1.1 Checklist – before the initial start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
9.2 To be performed periodically by competent persons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
9.3 Periodically by the operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
9.3.1 Checklist – periodically by the operator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
9.4 Annual testing of safe switch-off of the AS-i connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
10 Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
11 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.1 What to do in case of failure? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.2 Operating indicators of the LEDs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
11.3 Error messages 7-segment display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

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11.4 Multicolor indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
11.5 Error message query via AS-Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
12 Disposing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
13 Service and support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
14 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
14.1 General specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
14.2 Dimensions, weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
14.3 Dimensioned drawings: Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
15 Order guide and accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
16 EC Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

About this document
Leuze electronic MLD 300, MLD 500 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
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 initial commissioning nor their periodic
testing by a qualified person (see chapter 2.2). The checklists contain minimum testing requirements.
Depending on the application, other tests may be necessary.
Symbol indicating dangers to persons
NOTE Signal word for property damage
Indicates dangers that may result in property damage if the measures for danger
avoidance are not followed.
CAUTION Signal word for minor injury
Indicates dangers that may result in minor injury if the measures for danger avoid-
ance 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
EDM External Device Monitoring
MTTF Mean Time To Failure
OSSD Output Signal Switching Device
SIL Safety Integrity Level
RES Start/REStart interlock
PFH Probability of dangerous Failure per Hour
PL Performance Level

Safety
Leuze electronic MLD 300, MLD 500 7
2 Safety
Before using the safety sensor, a risk assessment must be performed according to valid standards (e.g.
EN ISO 14121, EN ISO 12100-1, EN ISO 13849-1, IEC 61508, EN IEC 62061). The result of the risk
assessment determines the required safety level of the safety sensor (see table 2.1). For mounting, oper-
ating and testing, this document as well as all applicable national and international standards, regulations,
rules and directives 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 observe the documents applicable to your
task.
In particular, the following national and international legal regulations apply for the commissioning, tech-
nical inspections and work with safety sensors:
• Machinery directive 2006/42/EC
• Low voltage directive 2006/95/EC
• Electromagnetic compatibility 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 Intended use and foreseeable misuse
2.1.1 Intended 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 competent persons (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.
The following table shows the safety-related characteristic parameters of the MLD 300 and MLD 500
series.
The device is intended for operation in buildings.
For safety-related information you may also contact local authorities (e.g., industrial inspector-
ate, 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
Leuze electronic MLD 300, MLD 500 8
Table 2.1: Models and safety-related characteristic parameters for the MLD 300 and MLD 500
series
• The safety sensor protects persons at access points or at points of operation of machines and sys-
tems.
• 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 in the safety
chain is essential.
• 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 periodically tested by persons with the necessary competence (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 mission time.
2.1.2 Using the laser alignment aid
The optional internal laser alignment aid is available for transmitter-receiver systems.
Laser alignment aids must only be switched on for the purpose of alignment or testing the alignment of
transmitters, receivers and deflecting mirror columns.
Model MLD 312
(for external testing)
MLD 300 MLD 500
Type in accordance with
EN IEC 61496-1, -2
Type 2 Type 2 Type 4
SIL in accordance with IEC 61508 SIL 1 SIL 3
SILCL in accordance with
EN IEC 62061
- SILCL 1 SILCL 3
Performance Level (PL) in accor-
dance with EN ISO 13849-1
Up to PL c a) PL c PL e
Category in accordance with
EN ISO 13849-1
Category 2 Category 3 Category 4
Probability of a dangerous failure
per hour
PFHd=1,2 x 10-8 b) PFHd=1,2 x 10-8 PFHd=6,6 x 10-9 c)
MTTFd204 years
a) with a respective safety monitoring device (e.g., Leuze electronic MSI-T), with DCavg ³ medium
b) during an external test with DC > 90 %, e.g., with a MSI-T Leuze electronic safety monitoring device
c) or 6.0 x 10E-9 with MLD/AS-i
WARNING
The laser light source corresponds to laser class 2 according to EN 60825-1. Extended looking into the
beam path may damage the eye's retina.
Never look directly into the laser beam or into the direction of reflected beams.
WARNING
Faulty or incorrect alignment may result in an operating fault!
Adjustment work with lasers must be carried out by competent and instructed persons only (see
chapter 2.2).

Safety
Leuze electronic MLD 300, MLD 500 9
Do not switch on the laser if persons are present in the laser path.
Inform persons in the vicinity before embarking on alignment work with lasers.
After switch-on the laser lights up for about 10 minutes. Do not leave the installation site during this time.
Interrupt the laser beam using a non-transparent, non-reflective object if the laser beam has inadver-
tently been pointed at a human.
Note the current legal and local laser protection regulations according to EN 60825-1.
Laser warning signs and notice signs
There are laser warning signs near the laser beam egress point(see figure 2.1).
Attach the supplied self-adhesive notice signs clearly visible at the safety sensor and on the device col-
umn (see figure 2.2).
If used in the U.S., attach the respective notice sign.
2.1.3 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
• Reachability of the point of operation by hand from the installation site of the safety sensor
• Detection of the presence of persons in danger zones
Figure 2.1: Laser warning sign
Figure 2.2: Self-adhesive notice signs
USA
DE
GB
FR
LASERSTRAHLUNG
NICHT IN DEN STRAHL BLICKEN
LASER KLASSE 2
DIN EN 60825-1: 2008-05
Max. Leistung:
Wellenlänge: 650 nm
1 mW
LASER LIGHT
DO NOT STARE INTO BEAM
CLASS 2 LASER PRODUCT
DIN EN 60825-1: 2008-05
Max. Output:
Wavelength:
1 mW
650 nm
RAYONNEMENT
NE PAS REGARDER DANS LE FAISCEAU
APPAREIL A LASER DE CLASSE 2
DIN EN 60825-1: 2008-05
Puissance max.:
Longueur d'onde émis:
1 mW
650 nm
LASER LIGHT
DO NOT STARE INTO BEAM
CLASS 2 LASER PRODUCT
IEC 60825-1: 2007
Max. Output:
Wavelength:
1 mW
650 nm
Complies with 21 CFR 1040.10

Safety
Leuze electronic MLD 300, MLD 500 10
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 are:
• They have a suitable technical education.
• They are familiar with the relevant parts of these instructions for the safety sensor and the machine.
In addition, the minimum requirements for suitability for
• configuration are: 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 daily 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 opera-
tion and maintenance 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 sub-
ject matter is performed in a timely manner and knowledge is kept up to date through continuous fur-
ther training ® Competent person in terms of the German Betriebssicherheitsverordnung (Ordinance
on Industrial Safety and Health) or other national legal regulations.
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
• 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
• Regular testing by instructed persons
2.4 Exemption of liability
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 MLD 300, MLD 500 11
3 Device description
The safety sensors of the MLD 300 and MLD 500 series are active optoelectronic protective devices, each
with two fail-safe OSSDs. They satisfy the following standards:
• Performance Level PL c and PL e in accordance with EN ISO 13849-1
• Safety category 2, 3 and 4 in accordance with EN ISO 13849-1
• Safety Integrity Level SIL 1 and SIL 3 in accordance with IEC 61508 and EN IEC 62061
• Type 2 and type 4 in accordance with EN IEC 61496-1, EN IEC 61496-2
The safety sensors are available as transmitter-receiver systems (1-, 2-, 3- and 4-beam) or as transceiver
systems (2- and 3-beam). All device models satisfy laser class 1 acc. to EN 60825-1 and EN 62471-2006.
They are protected against overvoltage and overcurrent acc. to IEC 60204-1 (safety class 3). Infrared
beams are modulated in specially shaped pulse packets in such a way that they can be distinguished from
ambient light (e.g. welding sparks, warning lights) and, thus, not be affected by it.
3.1 Device overview
The following tables provide an overview over the device models' functions of the MLD 300 and MLD 500
series.
Table 3.1: Models and functions of the MLD 300 series
Table 3.2: Models and functions of the MLD 500 series
Transmitter Receiver/transceiver
MLD 300 MLD 310 MLD 312 MLD 320 MLD 330
MLD 335
OSSDs 2122
Automatic start/restart 
RES a) 
EDM b) b)
Signal output 
LED indicator  
7-segment display 
Integrated muting 
a) RES selectable
b) EDM selectable
Transmitter Receiver/transceiver
MLD 500 MLD 500/
AS-i
MLD 510 MLD 520 MLD 530
MLD 535
MLD 510/
AS-i
OSSDs 2 2 2
Automatic start/restart 
RES a) 
EDM b) b)
Signal output 

Device description
Leuze electronic MLD 300, MLD 500 12
The transmitter-receiver system consists of one transmitter and one receiver.
The transceiver system consists of an active transceiver (transmitter/receiver) and a passive deflecting
mirror (no electrical connection, deflects the light beams by 2 x 90°).
3.2 Connection technology
Transmitter and receiver are equipped with M12 round pin plugs that differ in pin number depending on
device model:
LED indicator 
7-segment display 
Integrated muting 
a) RES selectable
b) EDM selectable
Transmitter Receiver/transceiver
MLD 500 MLD 500/
AS-i
MLD 510 MLD 520 MLD 530
MLD 535
MLD 510/
AS-i
Figure 3.1: Transmitter-receiver system
Figure 3.2: Transceiver system

Device description
Leuze electronic MLD 300, MLD 500 13
3.2.1 AS-i parameter port
The parameter port can only be addressed by the bus master. MLD/A1 delivers a safety at work-specific
code sequence which the AS-i safety monitor teaches in and permanently monitors. In addition, the bus
master has the option of reading the interfering signal via the parameter port and controlling an internal or
external muting display via the cyclical output data (see chapter 7.1.3).
3.3 Display elements
The display elements of the safety sensors simplify start-up and fault analysis.
3.3.1 Operating indicators on the transmitter
There is a green LED at each light axis of the transmitter serving as a function indicator.
Device models Number of pins on the
receiver/transceiver
Number of pins on
the transmitter
MLD 310, MLD 510 5-pin connector 5-pin connector
MLD 312 5-pin connector 5-pin connector
MLD 320, MLD 520 8-pin connector 5-pin connector
MLD 330, MLD 530 8-pin plug and 5-pin socket 5-pin connector
MLD 335, MLD 535 8-pin plug and 8-pin socket 5-pin connector
MLD 500/AS-i, MLD 510/AS-i 5-pin connector 5-pin connector
MLD 510-...I/O 5-pin plug and separate 5-pin socket for
external muting indicator
5-pin connector
1LED
2 Beam marking
Figure 3.3: Green LED on each transmitter light axis for function indication
1
2
Transmitter

Device description
Leuze electronic MLD 300, MLD 500 14
Table 3.3: Meaning of the LED
3.3.2 Operation indicators on the receiver
The receiver has a LED (LED1, red or green). The following device models have additional display
elements at the receiver:
Table 3.4: Additional display elements at the receiver
Table 3.5: Meaning of LED1
LED Description
Green Transmitted beam active
Off Error (transmitted beam inactive)
Receiver/transceiver
MLD 320 MLD 330 MLD 335 MLD 520 MLD 530 MLD 535
LED2 (yellow) 
7-segment display  
Muting indicators (optional)  
1LED1
2 OSSD icon
3 Interface icon
4 LED2 (MLD 320, MLD 330, MLD 335, MLD 520, MLD 530, MLD 535)
5 RES icon (MLD 320, MLD 330, MLD 335, MLD 520, MLD 530, MLD 535)
6 Beam marking
Figure 3.4: Operation indicators on the receiver
4
1
6
5
2
3
Receive r
LED1 Meaning
Red OSSD off
Green OSSD on

Device description
Leuze electronic MLD 300, MLD 500 15
Table 3.6: Meaning of the LED2 displays
Table 3.7: Meaning of LED2 for safety sensor with integrated AS-i interface (AS-i model)
3.3.3 7-segment display at the receiver
(MLD 330, MLD 335, MLD 530, MLD 535)
The 7-segment display shows the number of the operating mode (1 to 6) and assist in the detailed fault
diagnosis (see chapter 11). For the identification of the error, 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,
with an unauthorized restart being impossible.
Red, slowly flashing (approx. 1 Hz) External error (applies only for x10, 312, x20)
Red, flashing fast (approx. 10 Hz) Internal error (applies only for x10, 312, x20)
Green slowly flashing (approx. 1 Hz) OSSD on, weak signal
LED1 Meaning
LED2 Meaning
Yellow Start/restart interlock locked (restart required)
LED2 Meaning
Red AS-i slave not communicating with AS-i master
Green AS-i slave communicating with AS-i master
Yellow, flashing AS-i slave has invalid address 0
Red, flashing AS-i slave device error or AS-i connection defective
Red/green, flashing alternately Periphery error
Off No voltage

Device description
Leuze electronic MLD 300, MLD 500 16
Table 3.8: Meaning of the 7-segment display
3.3.4 Multicolor indicator
(Optional for MLD 320, MLD 330, MLD 335, MLD 520, MLD 530, MLD 535 as well as for MLD 510/AS-i,
MLD 510-...M/A)
The multicolor indicator signals the OSSD state (see table 11.1). In addition, during muting a constant
white light signals that muting has been started correctly and that the protective function has been bridged.
A muting error is signalized by flashing (see table 11.2).
Table 3.9: Multicolor indicator
1LED1
2 OSSD icon
3 Interface icon
4 7-segment display
5LED2
6 RES icon
7 Beam marking
Figure 3.5: 7-segment display on MLD 330, MLD 335, MLD 530, MLD 535 receiver
5
1
7
6
2
3
4
Receive r
Display Meaning
1...6 Selected operating mode in normal operation
F... Device error, internal error
E... Interference, external error (see chapter 11)
U... Usage Event, e.g., U52: muting time limit elapsed (see
chapter 11)
8 or . Error during uploading (see chapter 11)
Color Meaning
Green OSSD on

Device description
Leuze electronic MLD 300, MLD 500 17
3.4 Integrated laser alignment aid
(Optional for MLD 310, MLD 312, MLD 320, MLD 510, MLD 520)
The laser alignment aid is optionally available for transmitter-receiver systems. There is a red light laser
on the transmitter side of each light axis. The laser beams can all be switched on simultaneously via
MagnetKey. The sensor for the MagnetKey is located next to the transmitter's first light axis. The laser
beams remain active for approx. 10 min and then switch off automatically (see chapter 8.5).
Red OSSD off
Yellow/red, alternating Restart locked
White Muting (for MLDx30 and MLDx35)
Color Meaning
With AS-i devices, the integrated muting indicator must be set externally, e.g. via asimon config-
uration and diagnostics software.
1 Muting indicators
2 Beam marking
Figure 3.6: Muting indicator on the receiver
2
1
Alternatively, the laser can also be activated for approx. 10 min by a signal on the transmitter. To
do this, a change has to be made from 0 V to 24 V on PIN2, e.g. with a connected sensor (see
table 7.1).

Device description
Leuze electronic MLD 300, MLD 500 18
1 Transmitter
2 Laser
3 MagnetKey
4 Beam marking
Figure 3.7: MagnetKey activation position at first light axis of the transmitter
CAUTION
Danger! Class 2 laser beams!
Never look directly into the laser beam. This can cause damage to the eye.
1
4
3
2

Functions
Leuze electronic MLD 300, MLD 500 19
4 Functions
Table 4.1: Overview of the safety functions
Table 4.2: Functions of the different versions
4.1 Start/restart interlock
(MLD 320, MLD 330, MLD 335, MLD 520, MLD 530, MLS 535)
The start/restart interlock 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). The
operator must make certain that no people are present in the danger zone before the system is manually
re-enabled with the start/restart button (see chapter 8.6.1).
Function Description
Stop function safety-related; initiated by the protective device
RES (start/restart interlock) prevents automatic restart; forces manual confirmation
EDM (contactor monitoring) monitors the N/C contacts of downstream positive-guided
contactors and relays
Muting targeted, proper bridging of the protective function
Periodic function test safety-related; initiated and tested, e.g. by an external
safety monitoring device
Function MLD 310,
MLD 510
MLD 312,
testable
MLD 320,
MLD 520
MLD 330,
MLD 530
MLD 335,
MLD 535
OSSDs 21222
Automatic start/restart 
RES a) 
EDM a) 
EDM, selectable 
Signal output 
LED indicator 
7-segment display 
2-sensor muting, timing controlled and
sequential

b)
Timing controlled 4-sensor muting 
Laser alignment aid
(optional for transmitter-receiver systems)

Configurable operating modes 
External test 
a) Selectable
b) With shortened filter times: with one missing muting signal: 0.1 s instead of 3 s; with two missing muting signals: 50 ms
instead of 300 ms

Functions
Leuze electronic MLD 300, MLD 500 20
4.2 Contactor monitoring
(MLD 320, MLD 330, MLD 335, MLD 520, MLD 530, MLS 535)
The electro-sensitive protective equipment monitors the feedback circuits of the connected contactors.
The signal at the EDM input is compared to the state of the OSSDs. The feedback circuit must be open
while the OSSDs are switched on (high-impedance). When the OSSDs are switched off, 0 V is applied at
the EDM input (see chapter 7.2). The reaction at the EDM input with respect to the OSSDs is delayed by
maximum 500 ms (contactors).
4.3 Signal output
(MLD 320, MLD 330, MLD 335, MLD 520, MLD 530, MLS 535)
The receiver or transceiver features a signal output. PIN1 reports the state of the OSSDs.
Table 4.3: Signaling of the state of the OSSDs
4.4 Range switching
With transmitter/receiver systems, the range can be adjusted on PIN4 of the transmitter. It is possible to
switch between 50 m and 20 m.
Table 4.4: Range switching on PIN4 of the transmitter
4.5 MultiScan mode
Only after an interruption of the protective field continues for several consecutive scans is the system
switched off. This increases the availability (e.g. in the event of minor physical shocks).
4.6 Periodic function test
(MLD 312)
The receiver/transceiver of the MLD 312 is equipped with a test input for the periodic function test by an
external safety monitoring device (e.g. Leuze electronic MSI-T). Signal response and timing (see
figure 4.1).
Voltage on signal output (PIN1) OSSD
0 V On
24 V Off
PIN4 Operating range of the
MLD500Tx
Operating range of the
MLD500XTx
0 V 50 m 70 m
24 V 0 to 25 m 10 to 35 m
When using the external test, make certain that the test duration does not exceed 150 ms.