Wieland SLC Series User manual

SLC-4 Select Host/Guest
Safety Light Curtains
Operating instructions
Doc. no. BA001133
Release: 04/2017 (Rev. A)

Notes
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 2
Notes
Copyright
This document is copyright-protected. The rights derived from this copyright are reserved for
Wieland Electric. Reproduction of this document or parts of this document is only permissible
within the limits of the statutory provision of the Copyright Act. Any modification or abridg-
ment of the document is prohibited without the express written agreement of Wieland Electric.
samos is a registered trademark of WIELAND Electric GmbH
Allen-Bradley, CompactBlock Guard I/O, CompactLogix, ControlFLASH, ControlLogix, DH+,
FactoryTalk, FLEX, GuardLogix, Kinetix, Logix5000, MicroLogix, PanelBuilder, PanelView, Pha-
seManager, PLC-2, PLC-3, PLC-5, POINT I/O, POINT Guard I/O, Rockwell Automation, Rockwell
Software, RSBizWare, RSFieldbus, RSLinx, RSLogix 5000, RSNetWorx, RSView, SLC, Soft-
Logix, Stratix, Stratix 2000, Stratix 5700, Stratix 6000, Stratix 8000, Stratix 8300, Studio 5000,
Studio 5000 Logix Designer, SynchLink, and Ultra are registered trademarks of Rockwell Auto-
mation, Inc.
ControlNet, DeviceNet, and EtherNet/IP are registered trademarks of ODVA, Inc. TwinCAT is a
registered trademark of Beckhoff Automation GmbH.
EtherCAT is a registered trademark and a patented technology licensed by Beckhoff Automa-
tion GmbH.
Microsoft, Windows 98, Windows NT, Windows 2000, Windows XP, Windows 7, Windows 8,
and .NET Framework are registered trademarks of the Microsoft Corporation.
Any other product or trade names listed in this manual are the trademarks or registered trade-
marks of the respective owners.
Subject to change
Subject to technical changes for reasons of continued development.

Tableofcontents
1 About this document............................................. 5
1.1 Used symbols and signal words............................................................. 5
1.2 Checklists............................................................................................... 5
2 Safety.................................................................... 6
2.1 Intended use and foreseeable misuse .................................................... 6
2.1.1 Intended use.................................................................................................... 6
2.1.2 Foreseeable misuse ......................................................................................... 7
2.2 Necessary competencies........................................................................ 7
2.3 Responsibility for safety......................................................................... 8
2.4 Disclaimer .............................................................................................. 8
3 Device description................................................. 9
3.1 Device overview of the SLC family......................................................... 9
3.2 Connection technology........................................................................... 11
3.3 Cascading............................................................................................... 11
3.4 Display elements.................................................................................... 13
3.4.1 Operation indicators on the SLC-4TR transmitter............................................ 13
3.4.2 Operation indicators on the SLC-4SL receiver................................................. 14
3.4.3 Alignment display............................................................................................ 15
4 Functions............................................................... 16
4.1 Start/restart interlock RES...................................................................... 16
4.2 EDM contactor monitoring..................................................................... 16
4.3 Transmission channel changeover ......................................................... 17
4.4 Range reduction ..................................................................................... 17
5 Applications .......................................................... 18
5.1 Point of operation guarding.................................................................... 18
5.2 Access guarding..................................................................................... 19
5.3 Danger zone guarding ............................................................................ 19
6 Mounting............................................................... 20
6.1 Arrangement of transmitter and receiver ............................................... 20
6.1.1 Calculation of safety distanceS....................................................................... 20
6.1.2 Calculation of safety distance if protective fields act orthogonally to the
approach direction........................................................................................... 21
6.1.3 Calculation of safety distanceS for parallel approach to the protective field.. 26
6.1.4 Minimum distance to reflective surfaces......................................................... 27
6.1.5 Preventing mutual interference between adjacent devices............................. 28
6.2 Mounting the safety sensor.................................................................... 29
6.2.1 Suitable mounting locations ............................................................................ 29
6.2.2 Definition of directions of movement .............................................................. 30
6.2.3 Fastening via SLX-MO-TNUTM6 sliding blocks............................................... 31
6.2.4 Fastening via swivel mount SLX-MO-RO2....................................................... 31
6.2.5 Fastening via swiveling mounting bracketsSLX-MO-2RO3............................ 32
6.2.6 One-sided mounting on the machine table ..................................................... 33
Table of contents
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 3

6.3 Mounting accessories ............................................................................ 34
6.3.1 SLC-PRO protective screen ............................................................................. 34
7 Electrical connection ............................................. 35
7.1 Pin assignment transmitter and receiver................................................ 35
7.1.1 SLC-4TR transmitter ........................................................................................ 35
7.1.2 SLC-4SL receiver ............................................................................................. 37
8 Starting up the device ........................................... 38
8.1 Switching on .......................................................................................... 38
8.2 Aligning the sensor ................................................................................ 38
8.3 Aligning of deflecting mirrors with the laser alignment aid ................... 39
8.4 Unlocking start/restart interlock............................................................. 39
9 Testing .................................................................. 41
9.1 Before the initial start-up and following modifications .......................... 41
9.1.1 Checklist for integrator – to be performed prior to the initial start-up and
following modifications ................................................................................... 41
9.2 Regularly by qualified persons ............................................................... 43
9.3 Periodically by the operator.................................................................... 43
9.3.1 Checklist – periodically by the operator........................................................... 44
10 Maintenance.......................................................... 45
11 Troubleshooting .................................................... 46
11.1 What to do in case of failure? ................................................................ 46
11.2 Operating indicators of the LEDs............................................................ 46
11.3 Error messages 7-segment display......................................................... 47
12 Disposal................................................................. 50
13 Service and support .............................................. 51
14 Technical data ....................................................... 52
14.1 General specifications ............................................................................ 52
14.2 Dimensions, weight, response time ....................................................... 54
14.3 Dimensional drawings: Accessories....................................................... 58
15 Order guide and accessories ................................. 62
16 EC Declaration of Conformity................................ 69
Table of contents
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 4

About this document
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 5
1 About this document
1.1 Used symbols and signal words
Tab.1.1: Warning symbols and signal words
Symbol indicating dangers to persons
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 injuries
Indicates dangers that may result in minor injury if the measures for
danger avoidance are not followed.
WARNING Signal word for serious injury
Indicates dangers that may result in severe or fatal injury if the mea-
sures for danger avoidance are not followed.
DANGER Signal word for life-threatening danger
Indicates dangers with which serious or fatal injury is imminent if the
measures for danger avoidance are not followed.
Tab.1.2: Other symbols
Symbol for action steps
Text passages with this symbol instruct you to perform actions.
Symbol for action results
Text passages with this symbol describe the result of the preceding
action.
1.2 Checklists
The checklists (see chapter 9 "Testing") serve as a reference for the machine manufacturer or
supplier. They replace neither testing of the complete machine or system prior to initial com-
missioning nor their periodic testing by a qualified person (see chapter 2.2 "Necessary compe-
tencies"). The checklists contain minimum testing requirements. Depending on the application,
other tests may be necessary.

Safety
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 6
2 Safety
For mounting, operating and testing, this document as well as all applicable national and inter-
national standards, regulations, rules and directives must be observed. Relevant and supplied
documents must be observed, printed out and handed to affected persons.
ÄBefore working with the safety sensor, completely read and observe the documents appli-
cable to your task.
In particular, the following national and international legal regulations apply for the commis-
sioning, technical inspections and work with safety sensors:
• Machinery directive 2006/42/EC
• Low voltage directive 2014/35/EU
• EMC directive 2014/30/EU
• Use of work equipment directive 89/655/EEC supplemented by directive 95/63EC
• OSHA 1910 Subpart O
• Safety regulations
• Accident-prevention regulations and safety rules
• Ordinance on Industrial Safety and Health and employment protection act
• Product Safety Law (ProdSG and 9. ProdSV)
NOTICE For safety-related information you may also contact local authorities (e.g., industrial inspec-
torate, employer's liability insurance association, labor inspectorate, occupational safety and
health authority).
2.1 Intended use and foreseeable misuse
WARNING
A running machine may result in serious injury!
ÄMake certain that the safety sensor is correctly connected and that the protective func-
tion of the protective device is ensured.
ÄMake certain that, during all conversions, maintenance work and inspections, the system
is securely shut down and protected against being restarted.
2.1.1 Intended use
• The safety sensor may only be used after it has been selected in accordance with the re-
spectively applicable instructions and relevant standards, rules and regulations regarding
labor protection and safety at work, and after it has been installed on the machine, con-
nected, commissioned, and checked by a competent person (see chapter 2.2 "Necessary
competencies"). The devices are designed for indoor use only.
• When selecting the safety sensor it must be ensured that its safety-related capability
meets or exceeds the required performance level PLrascertained in the risk assessment
(see chapter 14.1 "General specifications").
• The safety sensor protects persons or body parts at points of operation, danger zones or
access points of machines and systems.
• With the “access guarding” function, the safety sensor detects persons only when they
enter the danger zone but cannot tell whether there are any persons inside the danger
zone. For this reason, a start/restart interlock or a suitable stepping behind protection in
the safety chain is essential in this case.
• The construction of the safety sensor must not be altered. When manipulating the safety
sensor, the protective function is no longer guaranteed. Manipulating the safety sensor
also voids all warranty claims against the manufacturer of the safety sensor.
• The safety sensor must be inspected regularly by a competent person to ensure proper in-
tegration and mounting (see chapter 2.2 "Necessary competencies").
• The safety sensor must be exchanged after a maximum of 20 years. Repairs or the ex-
change of wear parts do not extend the mission time.

Safety
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 7
2.1.2 Foreseeable misuse
Any use other than that defined under the “Approved purpose” or which goes beyond that use
is considered improper use.
In principle, the safety sensor is not suitable as a protective device for use in the following
cases:
• Danger posed by ejected objects or the spraying of hot or hazardous liquids from within
the danger zone
• Applications in explosive or easily flammable atmospheres
2.2 Necessary competencies
The safety sensor may only be configured, installed, connected, commissioned, serviced and
tested in its respective application by persons who are suitably qualified for the given task.
General prerequisites for suitably qualified persons:
• They have a suitable technical education.
• They are familiar with the relevant parts of the operating instructions for the safety sensor
and the operating instructions for the machine.
Task-specific minimum requirements for suitably qualified persons:
Configuration
Specialist knowledge and experience in the selection and use of protective devices on ma-
chines 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 align-
ment of the safety sensor with regard to the respective machine.
Electrical installation
Specialist knowledge and experience needed for the safe and correct electrical connection as
well as safe integration of the safety sensor in the safety-related control system.
Operation and maintenance
Specialist knowledge and experience needed for the regular inspection and cleaning of the
safety sensor – following instruction by the person responsible.
Servicing
Specialist knowledge and experience in the mounting, electrical installation and the operation
and 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 subject matter is performed in a timely manner and knowl-
edge is kept up to date through continuous further training ‑Competent person in terms of
the German Betriebssicherheitsverordnung (Ordinance on Industrial Safety and Health) or
other national legal regulations.

Safety
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 8
2.3 Responsibility for safety
Manufacturer and operator must ensure that the machine and implemented safety sensor
function properly and that all affected persons are adequately informed and trained.
The type and content of all imparted information must not lead to unsafe actions by users.
The manufacturer of the machine is responsible for:
• Safe machine construction
• Safe implementation of the safety sensor, verified by the initial test performed by a compe-
tent person (see chapter 2.2 "Necessary competencies")
• Imparting all relevant information to the operating company
• Adhering to all regulations and directives for the safe commissioning of the machine
The operator of the machine is responsible for:
• Instructing the operator
• Maintaining the safe operation of the machine
• Adhering to all regulations and directives for labor protection and safety at work
• Periodic testing by a competent person (see chapter 2.2 "Necessary competencies")
2.4 Disclaimer
The liability of Wieland Electric GmbH is to be excluded in the following cases:
• Safety sensor is not used as intended.
• Safety notices are not adhered to.
• Reasonably foreseeable misuse is not taken into account.
• Mounting and electrical connection are not properly performed.
• Proper function is not tested (see chapter 9 "Testing").
• Changes (e.g., constructional) are made to the safety sensor.

Device description
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 9
3 Device description
The safety sensors from the SLC-4 series are active opto-electronic protective devices. They
satisfy the following standards:
SLC-4
Type in accordance with ENIEC61496 4
Category in accordance with ENISO13849 4
Performance Level (PL) in accordance with ENISO13849‑1:2008 e
Safety Integrity Level (SIL) in accordance with IEC61508 and
SILCL in accordance with ENIEC62061 3
The safety sensor consists of a transmitter and a receiver (see chapter 3.1 "Device overview of
the SLC family"). It is protected against overvoltage and overcurrent acc. to IEC60204-1 (pro-
tection class3). The safety sensor is not dangerously influenced by ambient light (e.g., welding
sparks, warning lights).
3.1 Device overview of the SLC family
The series is characterized by two different receiver classes (Basic, Standard) with certain fea-
tures and properties (see table below).
Tab.3.1: Device models in the series with specific features and functions
Device type Transmitter Receiver
Function package Standard Select Professional
Model SLC-4TR SLC-4ST SLC-4SL SLC-4PR
OSSDs (2x) ■■■
Transmission channel
changeover
■■■■
LED indicator ■■■■
7‑segment display ■ ■
Automatic start/restart ■■■
RES ■ ■
EDM ■
Linkage ■
Blanking ■
Muting ■
Scan mode ■
Range reduction ■
Protective field properties
The beam distance and the number of beams are dependent on the resolution and protective
field height.
NOTICE Depending on the resolution, the effective protective field height can be larger than the opti-
cally active area of the safety sensor housed in yellow (see chapter 3.1 "Device overview of
the SLC family" and see chapter 14.1 "General specifications").

Device description
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 10
Device synchronization
The synchronization of receiver and transmitter for creating a functioning protective field is
done optically, i.e. without cables, via two specially coded synchronization beams. A cycle (i.e.
a pass from the first to the last beam) is called a scan. The length of a scan determines the
length of the response time and affects the calculation of the safety distance (see chapter 6.1.1
"Calculation of safety distanceS").
NOTICE For the correct synchronization and function of the safety sensor, at least one of the two syn-
chronization beams must be free during synchronization and operation.
a
b
b
a Optically active area, housed in yellow
b Synchronization beams
Fig.3.1: Transmitter-receiver system
QR code
A QR code as well as the corresponding web address are located on the safety sensor.
At the web address, you will find device information and error messages (see chapter 11.3 "Er-
ror messages 7-segment display") after scanning the QR code with a mobile end device or af-
ter entering the web address.
When using mobile end devices, mobile service charges can accrue.
Fig.3.2: QR code with corresponding web address (URL) on the safety sensor

Device description
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 11
3.2 Connection technology
The transmitter and receiver feature an M12 connector as an interface to the machine control
with the following number of pins:
Device model Device type Device plug
SLC-4TR Transmitter 5-pin
SLC-4SL Select receiver 8-pin
Host devices are also equipped with an interconnection cable, 400mm long, with M12 con-
nector for connecting MiddleGuest or Guest devices.
MiddleGuest devices are equipped with two interconnection cables, 400mm long, with M12
connector for connecting Host or Guest devices.
Guest devices are equipped with an interconnection cable, 400mm long, with M12 connector
for connecting Host or MiddleGuest devices.
3.3 Cascading
To implement linked protective fields, up to three SLC safety light curtains can be cascaded
one after the other.
Adjacent protective fields, e.g., for stepping behind protection, can thereby be implemented
without any additional expense for control and connection. The host system performs all nec-
essary processor tasks, provides indicators and the receiver-side interfaces to the machine and
command devices.
Devices with different resolutions can be combined.
With mounting brackets (see chapter 15 "Order guide and accessories"), an L or U-shaped
fixed connection can be created.
1
2
3
4
1 Host transmitter
2 Guest transmitter
3 Host receiver
4 Guest receiver
Fig.3.3: Cascaded system with 2 SLC safety light curtains

Device description
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 12
1
4
3
5
62
1 Host transmitter
2 MiddleGuest transmitter
3 Guest transmitter
4 Host receiver
5 MiddleGuest receiver
6 Guest receiver
Fig.3.4: Cascaded system with 3 SLC safety light curtains
NOTICE With permanently connected devices the resolution at the intersection point can be greater
than the resolution of the individual devices.
The operating range of the total system is defined by the component with the shortest oper-
ating range.
To operate a Host device without connected Guest devices, a terminating plug is required
(see chapter 15 "Order guide and accessories").
NOTICE The total number of beams for a Host–Guest or Host–MiddleGuest guest sys-
tem must not exceed the value 400!
ÄThe number of beams for a Host–Guest or Host–MiddleGuest guest system is deter-
mined by adding the number of beams of the individual devices (see chapter 14.2 "Di-
mensions, weight, response time").

Device description
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 13
3.4 Display elements
The display elements of the safety sensors simplify start-up and fault analysis.
3.4.1 Operation indicators on the SLC-4TR transmitter
Located in the connection cap on the transmitter are two LEDs which serve as function indica-
tors:
1
2
1 LED1, green/red
2 LED2, green
Fig.3.5: Indicators on the SLC-4TR transmitter
Tab.3.2: Meaning of the LEDs on the transmitter
LED Color State Description
1 Green/red OFF Device switched off
Red Device error
Green Normal operation
2 Green Flashing For 10s after switch-on: re-
duced range selected by the
wiring, see chapter 7.1 "Pin
assignment transmitter and
receiver"
OFF Transmission channel C1
ON Transmission channel C2

Device description
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 14
3.4.2 Operation indicators on the SLC-4SL receiver
Two LEDs and a 7-segment display for showing the operating state are located on the receiver:
13
4
2
5
1 LED1, red/green
2 LED2, yellow
3 OSSD icon
4 RES icon
5 7‑segment display
Fig.3.6: Indicators on the SLC-4SL receiver
Tab.3.3: Meaning of the LEDs on the receiver
LED Color State Description
1 Red/green OFF Device switched off
Red OSSD off
Red, flashing slowly (ap-
prox.1Hz) External error
Red, flashing fast (ap-
prox.10Hz) Internal error
Green, flashing slowly (ap-
prox.1Hz) OSSD on, weak signal
Green OSSD on
2 Yellow OFF • RES deactivated
• or RES activated and en-
abled
• or RES blocked and pro-
tective field interrupted
ON RES activated and blocked but
ready to be unlocked - protec-
tive field free
7-segment display at the SLC-4SL receiver
In normal operation, the 7-segment display shows the number of the selected transmission
channel. In addition, it helps during the detailed error diagnostics (see chapter 11 "Trou-
bleshooting") and serves as an alignment aid (see chapter 8.2 "Aligning the sensor").

Device description
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 15
Tab.3.4: Meaning of the 7-segment display
Display Description
After switching on
8 Self test
tnn Response time (t) of the receiver in milliseconds (nn)
In normal operation
C1 Transmission channel C1
C2 Transmission channel C2
For alignment
Alignment display (see chapter 3.4.3 "Alignment display").
For error diagnostics
F… Failure, internal device error
E… Error, external error
U… Usage info, application error
For error diagnostics, the error's respective letter is displayed first followed by the number
code. The display is repeated cyclically. An AutoReset is carried out after 10s for errors that do
not cause locking, with an unauthorized restart being impossible. In the case of blocking er-
rors, the voltage supply must be separated and the cause of the error must be eliminated. Be-
fore switching on again, the steps taken before initial commissioning must be repeated (see
chapter 9.1 "Before the initial start-up and following modifications").
The 7-segment display switches to alignment mode when the device has not yet been aligned
or when the protective field has been interrupted (after 5s). In this case, a fixed beam area
from the protective field is assigned to every segment.
3.4.3 Alignment display
Approximately 5s after a protective-field interruption, the 7-segment display switches to align-
ment mode.
In this mode, one third of the total protective field (Host, Middle Guest, Guest) is assigned to
one of the three horizontal segments and the state of this sub-protective field displayed as fol-
lows:
Tab.3.5: Function of alignment display
Segment Description
On All beams in the beam area are uninterrupted.
Flashing At least one, but not all beams in the beam area are uninterrupted.
Switched off All beams in the beam area are interrupted.
When the protective field has been free for about 5s, the device switches back to the display
of the operating mode.

Functions
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 16
4 Functions
An overview of features and functions of the safety sensor can be found in chapter “Device de-
scription” (see chapter 3.1 "Device overview of the SLC family").
Overview of functions
• Start/restart interlock (RES)
• EDM
• Range reduction
• Transmission channel changeover
4.1 Start/restart interlock RES
After accessing the protective field, the start/restart interlock ensures that the safety sensor re-
mains in the OFF state after the protective field has been cleared. It prevents automatic release
of the safety circuits and automatic start-up of the system, e.g. if the protective field is again
clear or if an interruption in the voltage supply is restored.
NOTICE For access guarding, the start/restart interlock function is mandatory. The protective device
may only be operated without start/restart interlock in certain exceptional cases and under
certain conditions acc. to ENISO12100.
WARNING
Deactivation of the start/restart interlock may result in serious injury!
ÄImplement the start/restart interlock on the machine or in a downstream safety circuit.
Using start/restart interlock
ÄWire the SLC-4SL receiver appropriately for the desired operating mode (see chapter 7
"Electrical connection").
The start/restart interlock function is automatically activated.
Switching the safety sensor back on after shutting down (OFF state):
ÄPress the reset button (Press/Release between 0.1s and 4s)
NOTICE The reset button must be located outside the danger zone in a safe place and give the opera-
tor a good view of the danger zone so that he/she can check whether anyone is located in it
(according to EN62046) before pressing the reset button.
DANGER
Risk of death if start/restart is operated unintentionally!
ÄEnsure that the reset button for unlocking the start/restart interlock cannot be reached
from the danger zone.
ÄBefore unlocking the start/restart interlock, make certain that no people are in the danger
zone.
After the reset button has been actuated, the safety sensor switches to the ON state.
4.2 EDM contactor monitoring
NOTICE The contactor monitoring of theSLC-4SL safety sensors can be activated through appropriate
wiring (see chapter 7.1.1 "SLC-4TR transmitter")!
The “contactor monitoring” function monitors the contactors, relays or valves connected
downstream of the safety sensor. Prerequisite for this are switching elements with positive-
guided feedback contacts (normal closed contacts).

Functions
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 17
Implement the contactor monitoring function:
• through appropriate wiring of the SLC-4SL safety sensors (see chapter 7.1.1 "SLC-4TR
transmitter").
• through the external contactor monitoring of the downstream safety relay, (e.g. samosPRO
from Wieland Electric)
• or through contactor monitoring of the downstream safety PLC (optional, integrated via a
safety bus)
If contactor monitoring is activated (see chapter 7 "Electrical connection"), it operates dynami-
cally, i.e., in addition to monitoring the closed feedback circuit every time before the OSSDs
are switched on, it also checks whether the release of the feedback circuit opened within 500
ms and, after the OSSDs are switched off, whether it has closed again within 500 ms. If this is
not the case, the OSSDs return to the OFF state after being switched on briefly. An error mes-
sage appears on the 7-segment display (E30, E31) and the receiver switches to the fault inter-
lock state from which it can only be returned to normal operation by switching the supply volt-
age off and back on again.
4.3 Transmission channel changeover
Transmission channels are used to prevent mutual interference of safety sensors which are lo-
cated close to each other.
NOTICE To guarantee reliable operation, the infrared beams are modulated so they can be discerned
from the ambient light. Welding sparks or warning lights, e.g. from passing high-lift trucks,
thereby do not influence the protective field.
With the factory setting, the safety sensor works in all operating modes with transmission
channelC1.
The transmission channel of the transmitter can be switched by changing the supply voltage
polarity (see chapter 7.1.1 "SLC-4TR transmitter").
The transmission channel of the receiver can be switched by changing the supply voltage po-
larity (see chapter 7.1.2 "SLC-4SL receiver").
NOTICE Faulty function due to incorrect transmission channel!
Select the same transmission channel on the transmitter and corresponding receiver.
4.4 Range reduction
In addition to selecting the suitable transmission channels (see chapter 4.3 "Transmission
channel changeover"), the range reduction also serves to prevent mutual interference of adja-
cent safety sensors. Activating the function reduces the light power of the transmitter so that
around half of the nominal range is reached.
Reducing range:
ÄWire pin4 (see chapter 7.1 "Pin assignment transmitter and receiver").
ðThe wiring of pin4 determines the transmitting power and thereby the range.
WARNING
Impairment of the protective function due to incorrect transmitting power!
The light power emitted from the transmitter is reduced through a single channel and without
safety-relevant monitoring.
ÄDo not use this configuration option for safety purposes.
ÄNote that the distance to reflective surfaces must always be selected so that no reflection
bypass can occur even at maximum transmitting power (see chapter 6.1.4 "Minimum dis-
tance to reflective surfaces").

Applications
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 18
5 Applications
The safety sensor only creates square protective fields.
5.1 Point of operation guarding
Point of operation guarding for hand and finger protection is typically the most common appli-
cation for this safety sensor. In accordance with ENISO13855, resolutions from 14to40mm
make sense here. This yields the necessary safety distance, among others (see chapter 6.1.1
"Calculation of safety distanceS").
Fig.5.1: Point of operation guarding protects reaching into the danger zone, e.g. for car-
toners or filling systems
Fig.5.2: Point of operation guarding protects reaching into the danger zone, e.g. for a
pick&place robot application

Applications
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 19
5.2 Access guarding
Safety sensors with up to 90mm resolution are used for access guarding into danger zones.
They detect people only upon entry into the danger zone, i.e., they do not detect parts of a per-
son or whether a person is present in the danger zone.
Fig.5.3: Access guarding on a transfer path
5.3 Danger zone guarding
Safety light curtains can be used in horizontal arrangement for danger zone guarding - either
as stand-alone device for presence monitoring or as stepping behind protection for presence
monitoring e.g. in combination with a vertically-arranged safety sensor. Depending on the
mounting height, resolutions of 40or90mm are used (see chapter 15 "Order guide and acces-
sories").
Fig.5.4: Danger zone guarding on a robot

Mounting
Wieland Electric GmbH | BA001133 | 04/2017 (Rev. A) 20
6 Mounting
WARNING
Improper mounting may result in serious injury!
The protective function of the safety sensor is only ensured if appropriately and professionally
mounted for the respective, intended area of application.
ÄOnly allow the safety sensor to be installed by qualified persons (see chapter 2.2 "Neces-
sary competencies").
ÄMaintain the necessary safety distances (see chapter 6.1.1 "Calculation of safety dis-
tanceS").
ÄMake sure that stepping behind, crawling under or stepping over the protective device is
reliably ruled out and reaching under, over or around is taken into account in the safety
distance, if applicable with additional distanceCRO corresponding to ENISO13855.
ÄTake measures to prevent that the safety sensor can be used to gain access to the danger
zone, e.g. by stepping or climbing into it.
ÄObserve the relevant standards, regulations and these instructions.
ÄClean the transmitter and receiver at regular intervals: environmental conditions (see
chapter 14 "Technical data"), care (see chapter 10 "Maintenance").
ÄAfter mounting, check the safety sensor for proper function.
6.1 Arrangement of transmitter and receiver
Optical protective devices can only perform their protective function if they are mounted with
adequate safety distance. When mounting, all delay times must be taken into account, such as
the response times of the safety sensor and control elements as well as the stopping time of
the machine, among others.
The following standards specify calculation formulas:
• IEC61496-2, "Active optoelectronic protective devices": distance of the reflecting sur-
faces/deflecting mirrors
• EN13855, "Safety of machines - The positioning of protective equipment in respect of ap-
proach speeds of parts of the human body": mounting situation and safety distances
NOTICE In accordance with ISO13855, with a vertical protective field, it is possible to pass under
beams over 300mm or pass over beams under 900mm. If the protective field is horizontal,
climbing on the safety sensor must be prevented through suitable installation or with covers
and the like.
6.1.1 Calculation of safety distanceS
General formula for calculating the safety distanceS of an Optoelectronic
Protective Device acc. to ENISO13855
S [mm] = Safety distance
K [mm/s] = Approach speed
T [s] = Total time of the delay, sum from (ta+ti+tm)
ta[s] = Response time of the protective device
ti[s] = Response time of the safety relay
tm[s] = Stopping time of the machine
C [mm] = Additional distance to the safety distance
NOTICE If longer stopping times are determined during regular inspections, an appropriate additional
time must be added to tm.