Leuze MLD 300, MLD 500 Operating Instructions Manual
MLD 300, MLD 500
Multiple light beam safety devices
EN 2016/02 - 607342
We reserve the right to
make technical changes
SAFE IMPLEMENTATION AND OPERATION
Original operating instructions
© 2016
Leuze electronic GmbH + Co. KG
In der Braike 1
D-73277 Owen / Germany
Phone: +49 7021 573-0
Fax: +49 7021 573-199
http://www.leuze.com
info@leuze.de
Leuze electronic MLD 300, MLD 500 2
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
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1 About this document
1.1 Used symbols and signal words
Table 1.1: Warning symbols and signal words
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.
About this document
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.
Table 1.2: Other symbols
Symbol for tips
Text passages with this symbol provide you with further information.
Table 1.3: Terms and abbreviations
AOPD Active Optoelectronic Protective Device
EDM External Device Monitoring
Symbols for action steps
Text passages with this symbol instruct you to perform actions.
-
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
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
Depending on the application, other tests may be necessary.
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(see chapter 2.2). The checklists contain minimum testing requirements.
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
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)
Safety
(see table 2.1). For mounting, oper
-
-
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).
2.1 Intended use and foreseeable misuse
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.
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 PL
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.
ascertained in the risk assessment.
r
-
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Table 2.1: Models and safety-related characteristic parameters for the MLD 300 and MLD 500
series
Safety
Model MLD 312
MLD 300 MLD 500
(for external testing)
Type in accordance with
Type 2 Type 2 Type 4
EN IEC 61496-1, -2
SIL in accordance with IEC 61508 SIL 1 SIL 3
SILCL in accordance with
- SILCL 1 SILCL 3
EN IEC 62061
Performance Level (PL) in accor
-
Up to PL c
a)
PL c PL e
dance with EN ISO 13849-1
Category in accordance with
Category 2 Category 3 Category 4
EN ISO 13849-1
Probability of a dangerous failure
PFH
=1,2 x 10-8
d
b)
PFHd=1,2 x 10
-8
PFHd=6,6 x 10-9
per hour
MTTF
d
a) with a respective safety monitoring device (e.g., Leuze electronic MSI-T), with DC
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
204 years
³ medium
avg
c)
• 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.
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.
Laser alignment aids must only be switched on for the purpose of alignment or testing the alignment of
transmitters, receivers and deflecting mirror columns.
-
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).
Leuze electronic MLD 300, MLD 500 8
Safety
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.
Figure 2.1: Laser warning sign
-
Figure 2.2: Self-adhesive notice signs
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.
DE
GB
FR
USA
LASERSTRAHLUNG
NICHT IN DEN STRAHL BLICKEN
LASER KLASSE 2
DIN EN 60825-1: 2008-05
Max. Leistung:
Wellenlänge: 650 nm
LASER LIGHT
DO NOT STARE INTO BEAM
CLASS 2 LASER PRODUCT
DIN EN 60825-1: 2008-05
Max. Output:
Wavelength:
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:
LASER LIGHT
DO NOT STARE INTO BEAM
CLASS 2 LASER PRODUCT
IEC 60825-1: 2007
Complies with 21 CFR 1040.10
Max. Output:
Wavelength:
1 mW
1 mW
650 nm
1 mW
650 nm
1 mW
650 nm
-
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
Leuze electronic MLD 300, MLD 500 9
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.
Safety
-
-
-
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.
Leuze electronic MLD 300, MLD 500 10
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
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
Device description
60825-1 and EN 62471-2006.
Transmitter Receiver/transceiver
MLD 300 MLD 310 MLD 312 MLD 320 MLD 330
MLD 335
OSSDs 2122
Automatic start/restart
RES
EDM
Signal output
LED indicator
7-segment display
Integrated muting
a) RES selectable
b) EDM selectable
a)
b)
b)
Table 3.2: Models and functions of the MLD 500 series
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
EDM
Signal output
Leuze electronic MLD 300, MLD 500 11
a)
b)
b)
Transmitter Receiver/transceiver
Device description
LED indicator
7-segment display
Integrated muting
a) RES selectable
b) EDM selectable
MLD 500 MLD 500/
AS-i
MLD 510 MLD 520 MLD 530
MLD 535
MLD 510/
AS-i
Figure 3.1: Transmitter-receiver system
The transmitter-receiver system consists of one transmitter and one receiver.
Figure 3.2: Transceiver system
The transceiver system consists of an active transceiver (transmitter/receiver) and a passive deflecting
mirror (no electrical connection, deflects the light beams by 2
3.2 Connection technology
Transmitter and receiver are equipped with M12 round pin plugs that differ in pin number depending on
device model:
x 90°).
Leuze electronic MLD 300, MLD 500 12
Device description
Device models Number of pins on the
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
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
3.3 Display elements
The display elements of the safety sensors simplify start-up and fault analysis.
receiver/transceiver
external muting indicator
(see chapter 7.1.3).
Number of pins on
the transmitter
5-pin connector
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.
1LED
2 Beam marking
Figure 3.3: Green LED on each transmitter light axis for function indication
1
2
Transmitter
Leuze electronic MLD 300, MLD 500 13
Table 3.3: Meaning of the LED
4
1
6
5
2
3
Receiver
LED Description
Green Transmitted beam active
Off Error (transmitted beam inactive)
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
Device description
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
Table 3.5: Meaning of LED1
LED1 Meaning
Red OSSD off
Green OSSD on
Leuze electronic MLD 300, MLD 500 14
Device description
LED1 Meaning
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
Table 3.6: Meaning of the LED2 displays
LED2 Meaning
Yellow Start/restart interlock locked (restart required)
Table 3.7: Meaning of LED2 for safety sensor with integrated AS-i interface (AS-i model)
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
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.
Leuze electronic MLD 300, MLD 500 15
Device description
4
1
Receiver
2
3
1LED1
2 OSSD icon
3 Interface icon
4 7-segment display
5LED2
6 RES icon
7 Beam marking
5
6
7
Figure 3.5: 7-segment display on MLD 330, MLD 335, MLD 530, MLD 535 receiver
Table 3.8: Meaning of the 7-segment display
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
8 or . Error during uploading (see chapter 11)
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
Table 3.9: Multicolor indicator
Color Meaning
chapter 11)
(see table 11.2).
Green OSSD on
Leuze electronic MLD 300, MLD 500 16
Color Meaning
Red OSSD off
Yellow/red, alternating Restart locked
White Muting (for MLDx30 and MLDx35)
With AS-i devices, the integrated muting indicator must be set externally, e.g. via asimon config-
uration and diagnostics software.
1
2
Device description
1 Muting indicators
2 Beam marking
Figure 3.6: Muting indicator on the receiver
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
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).
min and then switch off automatically (see chapter 8.5).
Leuze electronic MLD 300, MLD 500 17
Device description
1
2
3
4
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.
Leuze electronic MLD 300, MLD 500 18
4 Functions
Table 4.1: Overview of the safety functions
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
Muting targeted, proper bridging of the protective function
Periodic function test safety-related; initiated and tested, e.g. by an external
Table 4.2: Functions of the different versions
Functions
contactors and relays
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
EDM
EDM, selectable
Signal output
LED indicator
7-segment display
2-sensor muting, timing controlled and
a)
a)
b)
sequential
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
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
Leuze electronic MLD 300, MLD 500 19
(see chapter 8.6.1).
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
the EDM input
maximum 500 ms (contactors).
(see chapter 7.2). The reaction at the EDM input with respect to the OSSDs is delayed by
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
Voltage on signal output (PIN1) OSSD
0 V On
24 V Off
Functions
V is applied at
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
Table 4.4: Range switching on PIN4 of the transmitter
PIN4 Operating range of the
0 V 50 m 70 m
24 V 0 to 25 m 10 to 35 m
m and 20 m.
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
figure 4.1).
MLD500Tx
Operating range of the
MLD500XTx
(see
When using the external test, make certain that the test duration does not exceed 150 ms.
Leuze electronic MLD 300, MLD 500 20
Figure 4.1: Reaction of the OSSD switching output of the MLD 312 to an external test request
max.150 ms
High-impedance
OSSD-Output +24 V
High-impedance or 0 V
Input + 24 V
6 ms
6 ms
t
MS1
MS2
MS1
MS2
Muting
1
For series connection of multiple type 2 devices (e.g. MLD 312 and type 2 protective sensors),
cross connection between test signal and switching output is to be avoided. For this purpose,
connecting cables must be laid so that no cross connections can occur, or test signal and switch-
ing output must be laid in separate cables.
Functions
4.7 Muting
By means of muting, the protective function can be temporarily and properly suppressed, e.g. if objects
are to be transported through the protective field. During this time, the OSSDs remain in the ON state in
spite of interruption of one or more beams.
Muting is only initiated automatically and via two mutually independent muting signals. The muting indi
cator illuminates continuously during the entire duration of muting operation. End of muting operation is
forced as soon as the preset maximum duration (muting timeout) is exceeded.
Following malfunctions or operationally related interruptions (e.g. power failure, violation of the simulta
neity condition during timing controlled 2-sensor muting on activation of the muting sensors), the system
can be manually reset with the start/restart button and overridden.
4.7.1 Timing controlled 2-sensor muting
The two muting sensors MS1 and MS2 are arranged in such a way that the beams cross and the process
can utomatically activate both sensors (within 4
protective field in both directions. The intersection point must be within the danger zone to prevent muting
from being unintentionally triggered.
If muting was properly activated, it remains active even during brief interruptions of a single sensor signal.
On foil-wrapped objects, for example, brief signal interruptions can occur—particularly with diffuse
sensors. These short signal interruptions are, therefore, filtered out for up to max. 3
300 ms). If both muting sensors are inactive simultaneously, timing controlled 2-sensor muting ends.
-
-
s). As a result, an object can be transported through the
s (MLD 335, MLD 535:
Leuze electronic MLD 300, MLD 500 21
1 Danger zone
MS1 Muting sensor 1
MS2 Muting sensor 2
t Time frame in which both muting sensors must be activated (< 4 s)
Figure 4.2: Timing controlled 2-sensor muting – arrangement of the muting sensors and timing
4.7.2 Sequence controlled 2-sensor muting
1
MS2
MS1
MS1
MS2
Muting
<5 s
t
t
MS1
MS2
Muting n
>300 ms
Muting
n+1
1
MS2
MS1
<5 s
Sequence controlled 2-sensor muting is particularly well suited for exiting danger zones, especially if there
is only limited space available outside of the danger zone. In this case, material transport is only permis
sible in one direction due to the arrangement of the muting sensors. Muting sensors MS1 and MS2 are
positioned within the danger zone and arranged so that they are activated in sequence. Once the muting
area is clear again, the muting state ends with a delay of 5
In this way transported goods can exit the protective field in a timely manner.
1 Danger zone
MS1 Muting sensor 1
MS2 Muting sensor 2
t Time frame in which both muting sensors must be activated (< 8 h)
Figure 4.3: Sequence controlled 2-sensor muting – arrangement of the muting sensors and timing
Functions
-
s. MS2 must be activated within 8 h after MS1.
Sequence controlled 2-sensor muting can also be used if objects that are positioned close to one another
are to be moved through the protective field. The distance between the individual objects must, however,
be large enough that at least one muting sensor is free between two successive objects for at least 300 ms.
WARNING
Risk of death by through incorrect arrangement of the muting sensors!
Only select sequence controlled 2-sensor muting for material exits (see chapter 6.2.5).
1 Danger zone
MS1 Muting sensor 1
MS2 Muting sensor 2
t Time frame in which both muting sensors must be activated (< 8 h)
Figure 4.4: Muting for tight sequences of objects – arrangement of the muting sensors and timing
4.7.3 Timing controlled 4-sensor muting
(MLD 335, MLD 535)
Timing controlled 4-sensor muting is used when the muting sensor light beams should not cross, but
instead must be parallel, due to special application situations, e.g. with reflective materials or under disrup
tive environmental conditions. For timing controlled 4-sensor muting, the four muting sensors arranged in
succession must be activated in a defined and specific order to trigger muting
Leuze electronic MLD 300, MLD 500 22
(see figure 4.5).
-
Functions
1
MS3
MS4
MS1
MS2
MS1
MS2
Muting
t
MS3
MS4
Muting occurs during both forward and reverse travels. The order in which the muting sensors are acti
vated is decisive for launching muting. The following orders are permitted:
• MS1, MS2, MS3, MS4
• MS4, MS3, MS2, MS1
MS2 (MS3) must be activated within 4s of MS1 (MS4).
1 Danger zone
MS1 Muting sensor 1
MS2 Muting sensor 2
MS3 Muting sensor 3
MS4 Muting sensor 4
t Time frame in which both muting sensors must be activated (4 s)
Figure 4.5: Timing controlled 4-sensor muting: arrangement of the muting sensors and timing
-
Muting is ended correctly (e.g. the OSSDs remain in the ON state during passage) when the MS3 (MS2)
becomes free during the expected passing sequence and therefore switches to “inactive”.
Muting is ended incorrectly (e. g. the OSSDs switch off) when the following cases occur:
• During the muting process, a muting sensor incorrectly switches to “inactive”.
• MS2 is not activated within 4 s after MS1 (or MS3 is not activated within 4 s after MS4).
• The muting time limit has elapsed.
Make sure that the material to be transported is sufficiently long for the simultaneous activation
of the muting sensors (see chapter 6.2.6).
4.7.4 Muting timeout
A flexible, application-adapted muting timeout extension (e.g. by a high-pass signal) is possible in oper
ating modes 1, 5 and 6 (see chapter 4.7.9). In the standard operating modes, the time frame for the muting
timeout is set to 10 min and muting is automatically ended after this time elapses (the protective function
is active again). In operating modes 2 and 4, 100 h is set as muting timeout.
For this purpose, +24 V must be applied to the muting timeout input before muting is initiated. If, during
muting, voltage now switches to 0 V at this input (e.g. by a high-pass signal), the muting timeout is
extended as long as 0
possible for another 10
The muting timeout extension ends as soon as one of the following conditions is met:
• Level at the input of the muting timeout extension switches to the high state
• Muting duration reaches 100 h
-
V continues to be present. After the muting timeout extension ends, muting is only
min.
Leuze electronic MLD 300, MLD 500 23
MS1
MS1
MS2
Muting
Muting-TO
max. 10 min
1
Functions
MS2
Muting
Muting-EN/TO
1
1 M-EN / TO = high -> muting timeout extension
2 Start of the muting timeout extension
3 End of the additional muting timeout extension
Figure 4.6: Muting-timeout extension
max. 100 h
2
max. 10 min
3
1 M-EN / TO = low -> no muting timeout extension
Figure 4.7: No valid signal for timeout extension
4.7.5 Muting restart
Following a muting error (e.g. muting timeout, failure of the supply voltage), the restart button can be used
to override the muting path even if the protective field is interrupted
WARNING
Unmonitored overrides may result in serious injury!
A qualified person (see chapter 2.2) must observe the procedure exactly.
If necessary, the competent person (see chapter 2.2) must release the reset button immediately to
stop the dangerous movement.
Make certain that the danger zone can be viewed from the reset button and that the entire process can
be observed by a responsible person.
Before and during the muting override, ensure that there are no people in the danger zone.
4.7.6 Alternative connection for second muting signal
Particularly in cases in which the second independent muting signal comes, for example, from a control,
it is advantageous to connect this signal to the machine interface (8-pin plug). In operating modes 2, 3, 4
and 6, the second muting signal can alternatively be connected to input MS2 of the 8-pin plug or to input
MS2 of the local interface (5-pin socket).
(see chapter 8.6.2).
The muting signal from the control must not be applied constantly; rather, it must only be activat-
ed if muting is required.
Leuze electronic MLD 300, MLD 500 24
Functions
MS1
MS2
Muting
Muting-Enable
max. 8h
MS1
MS2
Muting
Muting-Enable
1 Machine interface (8-pin)
2 Local interface (5-pin socket)
Figure 4.8: 2nd muting signal from the control
4.7.7 Muting-enable
With the muting-enable function, muting can be enabled or disabled via an external signal. If +24 V is
applied at the muting-enable input, a subsequent, valid muting sequence results in muting. If 0
at the muting-enable input, no muting is possible, even if a valid muting sequence is detected. This signal
may be applied for a maximum of 8 hours (as high level); otherwise, an error is displayed. Before mutingenable can be used, 0
1
PLC
2
MS1
V must first be applied at the muting-enable input.
V is applied
Leuze electronic MLD 300, MLD 500 25
Figure 4.9: Muting-enable
Figure 4.10: No valid muting-enable signal
1 No muting possible here!
MS1
MS2
Muting
Muting-Enable
1
Figure 4.11: Example: Fault at the muting-enable cable
4.7.8 Partial muting
For transmitter-receiver systems, the top light beam is not included in muting in operating mode 6. As a
result, the protective device switches to the interlock state in spite of active muting if the upper beam is
interrupted.
4.7.9 Muting operating modes
The device models with integrated muting can be operated in six different operating modes. Corre
sponding to the operating mode selected, various functions are available for every muting type.
All functions and operating modes can be selected without additional equipment, such as PC, software,
etc.
Details concerning operating mode selection can be found in chapter “Electrical connection” (see
chapter 7.3).
Functions
-
Table 4.5: MLD 330, MLD 530 operating modes and functions (2-sensor muting)
Functions
Operating mode
1
2
3
4
5
RES
EDM
Muting operating mode
Selectable Timing controlled 2-sensor muting 10 min
Selectable Timing controlled 2-sensor muting 100 H
Selectable Sequence controlled 2-sensor muting 10 min
Sequence controlled 2-sensor muting 100 H
Selectable Timing controlled 2-sensor muting 10 min
Muting timeout
Muting timeout extension
Alternative connection for second
muting signal a)Muting-enable
Partial muting
Leuze electronic MLD 300, MLD 500 26
6
a) If the second muting signal comes, for example, from a control, this signal can also be connected to the 8-pin plug (usu-
ally establishes a connection to the switch cabinet).
Timing controlled 2-sensor muting 10 min
Table 4.6: MLD 335, MLD 535 operating modes and functions (2- and 4-sensor muting)
Functions
Functions
Operating mode
1
2
3
4
5
6
a) If the second muting signal comes, for example, from a control, this signal can also be connected to the 8-pin plug (usu-
b) Timing controlled 2-sensor muting also possible with shortened filter times: 0.1 s instead of 3 s
RES
ally establishes a connection to the switch cabinet).
EDM
Muting operating mode
Selectable Timing controlled 4-sensor muting
Selectable Timing controlled 4-sensor muting
Selectable Sequence controlled 2-sensor muting 10 min
Sequence controlled 2-sensor muting 100 H
Selectable Timing controlled 4-sensor muting
Timing controlled 4-sensor muting
Muting timeout
b)
10 min
b)
100 H
b)
10 min
b)
10 min
Muting timeout extension
Alternative connection for second
muting signala)Muting-enable
Partial muting
Leuze electronic MLD 300, MLD 500 27
5 Applications
5.1 Access guarding
MLD safety sensors are used e.g. for access guarding of danger zones. They detect people only upon
entry into the danger zone, i.e. they do not detect a person who is present in the danger zone. Access
guarding may therefore only be operated with activated start/restart interlock or additional safety measures
must be taken.
Applications
Figure 5.1: 2-beam guarding for exits on palleting lines
Figure 5.2: 3-beam guarding with transceiver system for an application with palletizing robot
Leuze electronic MLD 300, MLD 500 28
Applications
Figure 5.3: Access guarding with timing controlled 2-sensor muting for an application with a pallet wrap
ping machine
Figure 5.4: Access guarding on the roller conveyor with timing controlled 4-sensor muting (MLD 535 with
pre-mounted muting sensor sets)
-
Leuze electronic MLD 300, MLD 500 29
Applications
Figure 5.5: Access guarding of danger zones with 1-beam safety sensor for offset mounting locations
Figure 5.6: Access guarding based on AS-i safety at work with MLD 500/AS-i at a processing center
Leuze electronic MLD 300, MLD 500 30
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