SICK L26 User manual

OPERATING INSTRUCTIONS
L26
Single-beam photoelectric safety switch

Described product
L26
Manufacturer
SICK AG
Erwin-Sick-Str. 1
79183 Waldkirch
Germany
Legal information
This work is protected by copyright. Any rights derived from the copyright shall be
reserved for SICK AG. Reproduction of this document or parts of this document is only
permissible within the limits of the legal determination of Copyright Law. Any modifica‐
tion, abridgment or translation of this document is prohibited without the express writ‐
ten permission of SICK AG.
The trademarks stated in this document are the property of their respective owner.
© SICK AG. All rights reserved.
Original document
This document is an original document of SICK AG.
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Contents
1 About this document........................................................................ 5
1.1 Purpose of this document........................................................................ 5
1.2 Scope......................................................................................................... 5
1.3 Target groups of these operating instructions........................................ 5
1.4 Additional information.............................................................................. 5
1.5 Symbols and document conventions...................................................... 6
2 Safety information............................................................................ 7
2.1 General safety notes................................................................................ 7
2.2 Intended use............................................................................................. 7
2.3 Improper use............................................................................................. 7
2.4 Requirements for the qualification of personnel.................................... 7
3 Product description........................................................................... 9
3.1 Structure and function............................................................................. 9
3.2 Product characteristics............................................................................ 9
3.2.1 Device overview....................................................................... 9
3.2.2 Alignment aid (BluePilot)......................................................... 9
3.2.3 Test input.................................................................................. 10
3.2.4 Cascading................................................................................. 10
3.2.5 Application diagnostic output................................................. 10
3.2.6 IO-Link...................................................................................... 10
4 Project planning................................................................................ 12
4.1 Manufacturer of the machine.................................................................. 12
4.2 Operating entity of the machine.............................................................. 12
4.3 Design........................................................................................................ 12
4.3.1 Minimum distance from the hazardous point....................... 13
4.3.2 Minimum distance from reflective surfaces.......................... 15
4.3.3 Protection against interference from systems in close prox‐
imity to each other................................................................... 17
4.4 Integration in the electrical control system............................................. 17
4.4.1 Switching outputs.................................................................... 17
4.4.2 Test input.................................................................................. 18
4.4.3 Cascading................................................................................. 19
4.4.4 Application diagnostic output................................................. 19
4.4.5 IO-Link...................................................................................... 20
4.4.6 Connection diagrams.............................................................. 21
4.5 Testing plan............................................................................................... 23
4.5.1 Test rod check.......................................................................... 24
4.5.2 Visual check of the machine and the protective device........ 25
5 Mounting............................................................................................. 26
5.1 Safety......................................................................................................... 26
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5.2 Unpacking.................................................................................................. 26
5.3 Mounting................................................................................................... 27
6 Electrical installation........................................................................ 28
6.1 Safety......................................................................................................... 28
6.2 System connection (M12, 4-pin)............................................................. 28
7 Commissioning.................................................................................. 30
7.1 Safety......................................................................................................... 30
7.2 Overview.................................................................................................... 30
7.3 Switching on.............................................................................................. 30
7.4 Alignment of the sender and receiver..................................................... 31
7.4.1 Aligning the sender and receiver............................................ 31
7.5 Check during commissioning and modifications.................................... 32
8 Operation............................................................................................ 33
8.1 Safety......................................................................................................... 33
8.2 Regular thorough check........................................................................... 33
9 Maintenance...................................................................................... 34
9.1 Safety......................................................................................................... 34
9.2 Regular cleaning....................................................................................... 34
9.3 Regular thorough check........................................................................... 35
10 Troubleshooting................................................................................. 36
10.1 Safety......................................................................................................... 36
11 Decommissioning............................................................................. 38
11.1 Disposal..................................................................................................... 38
12 Technical data.................................................................................... 39
12.1 Data sheet................................................................................................. 39
12.2 Dimensional drawings.............................................................................. 41
13 Ordering information........................................................................ 42
13.1 Scope of delivery....................................................................................... 42
13.2 Ordering information L26......................................................................... 42
14 Accessories........................................................................................ 43
15 Annex.................................................................................................. 44
15.1 Compliance with EU directives................................................................. 44
15.2 Checklist for initial commissioning and commissioning........................ 45
16 List of figures..................................................................................... 46
17 List of tables....................................................................................... 47
CONTENTS
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1 About this document
1.1 Purpose of this document
These operating instructions contain the information needed during the life cycle of the
single-beam photoelectric safety switch.
Operating instructions of the single-beam photoelectric safety switch must be made
available to all people who work with the device.
Please read these operating instructions carefully and make sure that you understand
the content fully before working with the single-beam photoelectric safety switch.
1.2 Scope
These operating instructions only apply to the L26 single-beam photoelectric safety
switches with the following type label entries in the “Operating Instructions” field:
•8024679
This document is included with the following SICK part numbers (this document in all
available language versions):
8024679
1.3 Target groups of these operating instructions
Some chapters of these operating instructions are intended for certain target groups.
However, the entire operating instructions are relevant for intended use of the product.
Table 1: Target groups and selected chapters of these operating instructions
Target group Chapter of these operating instructions
Project developers
(planners, developers,
designers)
"Project planning", page 12
"Technical data", page 39
Installers "Mounting", page 26
Electricians "Electrical installation", page 28
Safety experts (such
as CE authorized rep‐
resentatives, compli‐
ance officers, people
who test and approve
the application)
"Project planning", page 12
"Commissioning", page 30
"Technical data", page 39
"Checklist for initial commissioning and commissioning", page 45
Operators "Operation", page 33
"Troubleshooting", page 36
Maintenance person‐
nel
"Maintenance", page 34
"Troubleshooting", page 36
"Ordering information", page 42
1.4 Additional information
www.sick.com
The following information is available on the Internet:
•This document in other languages
•Data sheets and application examples
•CAD data and dimensional drawings
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•Certificates (e.g. EU declaration of conformity)
•Guide for Safe Machinery Six steps to a safe machine
1.5 Symbols and document conventions
The following symbols and conventions are used in this document:
Safety notes and other notes
DANGER
Indicates a situation presenting imminent danger, which will lead to death or serious
injuries if not prevented.
WARNING
Indicates a situation presenting possible danger, which may lead to death or serious
injuries if not prevented.
CAUTION
Indicates a situation presenting possible danger, which may lead to moderate or minor
injuries if not prevented.
NOTICE
Indicates a situation presenting possible danger, which may lead to property damage if
not prevented.
NOTE
Indicates useful tips and recommendations.
Instructions to action
bThe arrow denotes instructions to action.
1. The sequence of instructions for action is numbered.
2. Follow the order in which the numbered instructions are given.
✓The check mark denotes the result of an instruction.
LED symbols
These symbols indicate the status of an LED:
oThe LED is off.
ÖThe LED is flashing.
OThe LED is illuminated continuously.
Sender and receiver
These symbols indicate the sender and receiver of the device:
sThe symbol indicates the sender.
rThe symbol indicates the receiver.
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2 Safety information
2.1 General safety notes
DANGER
If the safety component is integrated incorrectly, the dangerous state may be ended to
late.
bPlan the integration of the safety component in accordance with the machine
requirements, see "Project planning", page 12.
2.2 Intended use
When used in conjunction with a suitable external test device, the L26 single-beam
photoelectric safety switch is a Type 2 electro-sensitive protective device (ESPE) in
accordance with IEC 61496-1 and IEC 61496-2.
The external test device must satisfy the applicable requirements for a type 2 device in
accordance with IEC 61496-1 and IEC 61496-2. Suitable test devices include, for
example, all SICK safety controllers that allow a single-beam photoelectric safety switch
to be connected, e.g., Flexi Soft or Flexi Classic. A single-beam photoelectric safety
switch in combination with an external test device can be used in safety applications up
to Category 2 according to EN ISO 13849, SILCL1 according to EN 62061 or up to PL c
according to EN ISO 13849.
The single-beam photoelectric safety switch is suitable for the following applications:
•Access protection
•Hazardous area protection
The single-beam photoelectric safety switch does not emit any paint wetting impairment
substances or volatile silicones and does not expel any fixed parts or materials into its
surroundings.
The single-beam photoelectric safety switch must only be used within the limits of the
prescribed and specified technical data and operating conditions at all times.
Any instance of improper use, incorrect modification, or manipulation of the L26 single-
beam photoelectric safety switch shall void any warranty provided by SICK AG; further‐
more, SICK AG shall not accept any responsibility or liability for any resulting damage
and consequential damage.
2.3 Improper use
The single-beam photoelectric safety switch works as an indirect protective measure
and cannot provide protection from pieces thrown from application nor from emitted
radiation. Transparent objects are not detected.
Among others, the single-beam photoelectric safety switch is not suitable for the follow‐
ing applications:
•Outdoors
•Underwater
•In explosion-hazardous areas
•In environments with increased levels of ionizing radiation
2.4 Requirements for the qualification of personnel
The protective device must be configured, installed, connected, commissioned, and ser‐
viced by qualified safety personnel only.
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Project planning
For project planning, a person is considered competent when he/she has expertise and
experience in the selection and use of protective devices on machines and is familiar
with the relevant technical rules and national work safety regulations.
Mechanical mounting, electrical installation, and commissioning
For the task, a person is considered qualified when he/she has the expertise and expe‐
rience in the relevant field and is sufficiently familiar with the application of the protec‐
tive device on the machine to be able to assess whether it is in an operationally safe
state.
Operation and maintenance
For operation and maintenance, a person is considered competent when he/she has
the expertise and experience in the relevant field and is sufficiently familiar with the
application of the protective device on the machine and has been instructed by the
machine operator in its operation.
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3 Product description
3.1 Structure and function
Overview
The L26 single-beam photoelectric safety switch is an electro-sensitive protective
device consisting of a sender and receiver.
The hazardous area is protected by means of a light beam between the sender and
receiver. As soon as the light beam is interrupted, the protective device reports the
interruption in the light path to the secure output signal switching devices.
Sensing range
The scanning range is the maximum dimension of the light path between sender and
receiver. This depends on the light source of the sensor.
3.2 Product characteristics
3.2.1 Device overview
1
Figure 1: Sender overview
1green operating LED: supply voltage active
1
32
Figure 2: Receiver overview
1alignment aid (BluePilot): blue alignment quality LEDs
2yellow status LED: light received indicator
3green operating LED: supply voltage active
3.2.2 Alignment aid (BluePilot)
An alignment aid is installed in the receiver of the single-beam photoelectric safety
switch. The alignment aid consists of 5 blue alignment quality LEDs.
After switching on the protective device, the alignment aid indicates the alignment qual‐
ity on the receiver.
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3.2.3 Test input
The sender has a test input that can be used to switch off the light beam of the sender
and thereby simulate an interruption of the light beam.
The test input is provided for the purposes of checking the functioning of the sender
and receiver. When used in combination with an external test device to evaluate the
test results, the protective device is suitable for safety applications.
3.2.4 Cascading
Cascading allows up to 4 single-beam photoelectric safety switches to be connected in
series.
3.2.5 Application diagnostic output
Overview
An application diagnostic output can be configured on pin 2 of the system connection
of the receiver via IO-Link.
The application diagnostic output will signal a specific status of the protective device
depending on the configuration.
The status of the protective device is indicated via the yellow status LED.
Output signals
The following signals can be outputted via the application diagnostic output:
•Alarm
When Alarm is configured on the application diagnostic output, the application
diagnostic output signals when the protective device is only partially operational,
for example if the sender or receiver is contaminated or poorly aligned.
•Health
When Health is configured on the application diagnostic output, the application
diagnostic output signals when the protective device is only partially operational,
for example if the sender or receiver is contaminated or poorly aligned, or the
cable is damaged.
Further topics
•"Application diagnostic output", page 19
3.2.6 IO-Link
Overview
The protective device is IO-Link capable.
The IO-Link communication between the protective device and a PC can occur via an
IO-Link master. To do so, connect the IO-Link master to the system connection of the
receiver, and via a USB cable to a PC.
The connected protective device can be configured, or data exchanged or transferred
using the SOPAS ET configuration software.
Data exchange and configuration
The following data, for example, can be exchanged or transferred via IO-Link:
•Device information
•Quality of reception
The following functions, for example, can be configured via IO-Link:
•Switching output
•Application diagnostic output
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The green operational LED on the receiver flashes during IO-Link communication.
Further topics
•"IO-Link", page 20
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4 Project planning
4.1 Manufacturer of the machine
DANGER
Hazard due to lack of effectiveness of the protective device
Persons and parts of the body to be protected may not be recognized in case of non-
observance.
bUse of the single-beam photoelectric safety switch requires a risk assessment.
Check whether additional protective measures are required.
bComply with the applicable national regulations derived from the application (e.g.,
work safety regulations, safety rules, or other relevant safety guidelines).
bDo not combine the components of the single-beam photoelectric safety switch
with components from other single-beam photoelectric safety switches.
bApart from the procedures described in this document, the components of the sin‐
gle-beam photoelectric safety switch must not be opened.
bThe components of the single-beam photoelectric safety switch must not be tam‐
pered with or changed.
bImproper repair of the protective device can lead to a loss of the protective func‐
tion. Do not carry out any repairs on the device components.
4.2 Operating entity of the machine
DANGER
Hazard due to lack of effectiveness of the protective device
Persons and parts of the body to be protected may not be recognized in case of non-
observance.
bChanges to the electrical integration of the single-beam photoelectric safety switch
in the machine control and changes to the mechanical mounting of the single-
beam photoelectric safety switch necessitate a new risk assessment. The results
of this risk assessment may require the entity operating the machine to meet the
obligations of a manufacturer.
bApart from the procedures described in this document, the components of the sin‐
gle-beam photoelectric safety switch must not be opened.
bThe components of the single-beam photoelectric safety switch must not be tam‐
pered with or changed.
bImproper repair of the protective device can lead to a loss of the protective func‐
tion. Do not carry out any repairs on the device components.
4.3 Design
This chapter contains important information about the design.
For information on the individual steps for mounting the device, see: see "Mounting",
page 26.
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DANGER
Hazard due to lack of effectiveness of the protective device
Persons and parts of the body to be protected may not be recognized in case of non-
observance.
bMake sure that the following design requirements are met so that the single-beam
photoelectric safety switch can fulfill its protective function.
°Sender and receiver must be arranged such that persons or parts of the body
are reliably detected when they enter the hazardous area.
°Ensure that nobody can pass under the light beam or pass by the side of the
protective device.
°If people can stay between the protective device and the hazardous point
without being detected, check if additional protective measures (e.g., restart
interlock) are required.
DANGER
Hazard due to lack of effectiveness of the protective device
Certain types of light radiation can influence the protective device, e.g., light radiation
from fluorescent lamps with electronic ballast installed in the path of the beam, or
beams from laser pointers directed at the receiver.
bIf this type of light radiation is present in the environment of the protective device,
take additional measures to ensure that the protective device does not become
dangerous.
4.3.1 Minimum distance from the hazardous point
Overview
A minimum distance must be maintained between the single-beam photoelectric safety
switch and the hazardous point. This distance is required to prevent a person or part of
their body from reaching the hazardous point before the end of the machine’s danger‐
ous state.
Calculating the minimum distance according to ISO 13855
The calculation of the minimum distance is based on international or national stan‐
dards and statutory requirements applicable at the place of installation of the machine.
If the minimum distance is calculated according to ISO 13855, it depends on the fol‐
lowing points:
•Machine stopping time (time interval between triggering the sensor function and
the end of the machine’s dangerous state)
•Response time of the protective device
•Reach or approach speed of the person
•Number of beams and beam separation of the single-beam photoelectric safety
switch
•Type of approach: orthogonal (at right angles) or parallel
•Parameters specified based on the application
For the USA (scope of OSHA and ANSI), different regulations may apply, e.g.:
a) Laws: Code of Federal Regulations, Title 29 (CFR 29), Part 1910.217
b) Standards: ANSI B11.19
Complementary information
Additional information is available in the ISO 13855 standard and in the Guide for Safe
Machinery.
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SICK offers a stopping/run-down time measurement service in many countries.
4.3.1.1 Calculating minimum distance from the hazardous point
Important information
DANGER
Minimum distance from the hazardous point is too small
The dangerous state of the machine may not be stopped or not be stopped in a timely
manner due to a minimum distance that is too small.
bCalculate the minimum distances for the machine in which the single-beam photo‐
electric safety switch is integrated.
bWhen mounting the single-beam photoelectric safety switch, observe the minimum
distance.
Approach
The example shows the calculation of the minimum distance for an orthogonal (at right
angles) approach to the single-beam photoelectric safety switch. Depending on the
application and the ambient conditions, a different calculation may be required (e.g., at
a different angle to the direction of approach or an indirect approach).
1. Calculate S using the following formula:
S = K × T + C
where:
°S = minimum distance in millimeters (mm)
°K = approach speed of 1600 mm/s
°T = machine stopping time + response time of the protective device after
interruption in the light path in seconds (s)
°C = adjustment factor that depends on the number of beams (1, 2, 3 or 4)
Table 2: Variables for calculating the minimum distance
Number of
beams
1234
Height of the
beams above
ground in mm
750 400
900
300
700
1100
300
600
900
1200
Adjustment fac‐
tor C in mm
1200 850 850 850
The reach or approach speed is already included in the formula.
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!"
§
S
Figure 3: Minimum distance from the hazardous point
!Height of the light beams above ground
"Hazardous point
§Depending on the application and distance, persons must be prevented from standing
behind the protective device.
Example calculation: access protection, no danger from reaching over
Machine stopping time = 290 ms
Response time after interruption of the light path = 20 ms
T = 290 ms + 20 ms = 310 ms = 0.31 s
S = 1600 mm/s × 0.31 s + 1200 mm = 1696 mm
4.3.2 Minimum distance from reflective surfaces
Overview
The light beam from the sender may be deflected by reflective surfaces and dispersive
media. This can prevent an object from being detected.
Therefore, all reflective surfaces and objects (e.g. material bins, machine table, etc.)
must be kept at a minimum distance (a) from the light beam. This minimum distance
(a) must be maintained on all sides of the light beam. This applies in horizontal, vertical
and diagonal directions as well as at the end of the device. The same area must be free
of dispersive media (e.g., dust, fog, or smoke).
The minimum distance (a) depends on the distance (D) between sender and receiver.
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rs
D
a
Figure 4: Minimum distance from reflective surfaces
Important information
DANGER
Hazard due to lack of effectiveness of the protective device
Reflective surfaces and dispersive media can prevent persons or parts of the body to
be protected from being properly reflected and therefore, they remain undetected.
bMake sure that all reflective surfaces and objects maintain a minimum distance
from the light beam.
bMake sure that no dispersive media (e.g., dust, fog, or smoke) are within the calcu‐
lated minimum distance from the light beam.
Determining minimum distance to reflective surfaces
1. Determine the distance between sender and receiver D in meters (m).
2. Read the minimum distance a in millimeters (mm) in the graph or calculate it
based on the respective formula from table 3:
10 20 30 40 50 60 70 D/m
1000
2000
4000
3000
5000
6000
7000
a/mm
262
3
Figure 5: Graph of minimum distance from reflective surfaces
Table 3: Formula for calculating the minimum distance from reflective surfaces
Distance between sender and
receiver D in m
Calculating the minimum distance from reflective sur‐
faces a in mm
D ≤ 3 m a = 262 mm
D > 3 m a = tan (5°) × 1,000 mm/m × D = 87.49 × 1 mm/m × D
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4.3.3 Protection against interference from systems in close proximity to each other
Overview
s
rs
r
!
"
Figure 6: Preventing mutual interference from system
! and system "
The light beam of the sender of system ! can interfere with the receiver of system ".
This can disrupt the protective function of system ". This would mean that the operator
is at risk.
Avoid such installation situations or take appropriate action, e.g., install optically
opaque partitions or reverse the direction of transmission of a system.
Important information
DANGER
Hazard due to lack of effectiveness of the protective device
Systems of single-beam photoelectric safety switches in close proximity to one another
can mutually interfere with each other.
bUse suitable measures to prevent interference between systems in close proximity
to each other.
4.4 Integration in the electrical control system
This chapter contains important information about integration in the electrical control.
Information about the individual steps for electrical installation of the device: see "Elec‐
trical installation", page 28.
Requirements for use
As the single-beam photoelectric safety switch is classified as a Type 2 device in accor‐
dance with IEC 61496, it must be monitored by an external test device. The test input
of the sender and a semiconductor switching output of the receiver are used for this
purpose.
To connect the single-beam photoelectric safety switch, refer to the corresponding oper‐
ating instructions for the test device or for the higher-order control system.
4.4.1 Switching outputs
Overview
Two switching outputs are provided for evaluation by an external test device:
•QL1/C
Switching output or IO-Link communication
•MF
Switching output or configurable output
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The factory setting for the switching outputs is Q. The switching behavior can be found
in table 4.
Table 4: Push-pull
Q
Push-pull
(≤ 100 mA)
+ (L+)
Q
‒(M)
+ (L+)
Q
‒(M)
Q
Push-pull
(≤ 100 mA)
+ (L+)
Q
‒(M)
+ (L+)
Q
‒(M)
Important information
NOTE
If IO-Link is used on the device, the MF switching output with the factory setting Q must
be used.
If no IO-Link is used on the device, any of the switching outputs with the factory setting
Q can be used.
The single-beam photoelectric safety switch must not be supplied with voltage via the
IO-Link master.
4.4.2 Test input
Overview
The sender has a test input that can be used to switch off the light beam of the sender
and thereby simulate an interruption of the light beam.
The test input is provided for the purposes of checking the functioning of the sender
and receiver. When used in combination with an external test device to evaluate the
test results, the protective device is suitable for safety applications.
Functionality
As soon as the test input is activated, the light beam of the sender is switched off to
simulate an object having been detected.
bRefer to table 5 to check the function.
bIf the switching output fails to behave in accordance with table 5, check the appli‐
cation conditions.
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Table 5: Test
Test → M
+ (L+)
Test
‒ (M)
+ (L+)
Test
‒(M)
Further topics
•"Troubleshooting", page 36
4.4.3 Cascading
You can use cascading to connect up to 4 single-beam photoelectric safety switches in
series.
Figure 7: Example for connecting a single-beam photoelectric safety switch in a 2-device cascade
(T = test device)
4.4.4 Application diagnostic output
Overview
An application diagnostic output can be configured on pin 2 of the system connection
of the receiver via IO-Link.
The application diagnostic output will signal a specific status of the protective device
depending on the configuration.
The status of the protective device is indicated via the yellow status LED.
Output signals
The following signals can be outputted via the application diagnostic output:
•Alarm
When Alarm is configured on the application diagnostic output, the application
diagnostic output signals when the protective device is only partially operational,
for example if the sender or receiver is contaminated or poorly aligned.
In the good state: LOW (0), if excessively contaminated HIGH (1), see table 6,
page 20
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•Health
When Health is configured on the application diagnostic output, the application
diagnostic output signals when the protective device is only partially operational,
for example if the sender or receiver is contaminated or poorly aligned, or the
cable is damaged.
In the good state: HIGH (1), if excessively contaminated or in the event of cable
interruption LOW (0), see table 6, page 20
Table 6: Alarm / Health
Alarm (≤ 100 mA) Health (≤100 mA)
+ (L+)
Alarm
‒(M)
+ (L+)
Health
‒(M)
+ (L+)
Alarm
‒(M)
+ (L+)
Health
‒(M)
4.4.5 IO-Link
Overview
The protective device is IO-Link capable.
The IO-Link communication between the protective device and a PC can occur via an
IO-Link master. To do so, connect the IO-Link master to the system connection of the
receiver, and via a USB cable to a PC.
The connected protective device can be configured, or data exchanged or transferred
using the SOPAS ET configuration software.
Important information
DANGER
The output signal of the protective device that is evaluated via the external test device
is configured via IO-Link, e.g., using the logic or time delay functions.
This can slow down the response time of the protective device, or make it not possible
to evaluate it with the external test device.
bUse the Q configuration for the switching output when using the protective device
in conjunction with an external test device.
bTake the use of the logic and time delay functions appropriately into consideration
in the risk assessment.
Prerequisites
•SOPAS ET configuration software
•SiLink2 Master IO-Link master
Data exchange and configuration
The following data, for example, can be exchanged or transferred via IO-Link:
•Device information
•Quality of reception
4 PROJECT PLANNING
20 O P E R A T I N G I N S T R U C T I O N S | L26 8024681/2020-01-24 | SICK
Subject to change without notice