schmersal SLG 420 series User manual

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EN Operating instructions. . . . . . . . . . . .pages 1 to 14
Translation of the original operating instructions
SLG 420
Operating instructions
Safety light grid
EN 1
1. About this document
1.1 Function
This operating instructions manual provides all the information you
need for the mounting, set-up and commissioning to ensure the safe
operation and disassembly of the safety switchgear. The operating inst-
ructions must be available in a legible condition and a complete version
in the vicinity of the device.
1.2 Target group: authorised qualified personnel
All operations described in this operating instructions manual must
be carried out by trained specialist personnel, authorised by the plant
operator only.
Please make sure that you have read and understood these operating
instructions and that you know all applicable legislations regarding
occupational safety and accident prevention prior to installation and
putting the component into operation.
The machine builder must carefully select the harmonised standards to
be complied with as well as other technical specifications for the selec-
tion, mounting and integration of the components.
1.3 Explanation of the symbols used
Information, hint, note:
This symbol is used for identifying useful additional informa-
tion.
Caution: Failure to comply with this warning notice could
lead to failures or malfunctions.
Warning: Failure to comply with this warning notice could
lead to physical injury and/or damage to the machine.
1.4 Appropriate use
The products described in these operating instructions are developed to
execute safety-related functions as part of an entire plant or machine. It
is the responsibility of the manufacturer of a machine or plant to ensure
the correct functionality of the entire machinery or plant.
The safety switchgear must be exclusively used in accordance with the
versions listed below or for the applications authorised by the manufac-
Content
1 About this document
1.1 Function............................................1
1.2 Target group: authorised qualied personnel. . . . . . . . . . . . . . . .1
1.3 Explanation of the symbols used . . . . . . . . . . . . . . . . . . . . . . . . .1
1.4 Appropriate use ......................................1
1.5 General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.6 Warning about misuse.................................2
1.7 Exclusion of liability ...................................2
2 Product description
2.1 Ordering code .......................................2
2.2 Special versions......................................2
2.3 Scope of delivery and accessories . . . . . . . . . . . . . . . . . . . . . . .2
2.3.1 Accessories included in delivery . . . . . . . . . . . . . . . . . . . . . . . . .2
2.3.2 Optional accessories ..................................2
2.4 Destination and use...................................2
2.5 Technical data .......................................3
2.6 Response time (reaction time). . . . . . . . . . . . . . . . . . . . . . . . . . .3
2.7 Safety classication...................................3
2.8 Functions...........................................3
2.8.1 Protective mode......................................3
2.8.2 Restart interlock (manual reset). . . . . . . . . . . . . . . . . . . . . . . . . .4
2.8.3 Fixed blanking .......................................4
2.8.4 Contactor control (EDM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2.8.5 Start interlock........................................4
2.9 Testing .............................................4
2.10 Beam coding ........................................5
3 Mounting
3.1 General conditions....................................5
3.2 Protection eld and approach . . . . . . . . . . . . . . . . . . . . . . . . . . .5
3.3 Alignment...........................................5
3.4 Safety distance ......................................6
3.5 Minimum distance to reecting surfaces . . . . . . . . . . . . . . . . . . .6
3.6 Dimensions .........................................7
4 Electrical connection
4.1 Wiring example default ................................9
4.2 Activation of the contactor control (EDM) without software . . . . .9
4.3 Connector conguration Receiver, Emitter & Cable. . . . . . . . . .10
5 Set-up and maintenance
5.1 Check before start-up ................................10
5.2 Maintenance .......................................11
5.3 Regular check ......................................11
5.4 Half-yearly inspection.................................11
5.5 Cleaning...........................................11
6 Diagnostic
6.1 LED status information................................11
6.2 Fault diagnostic .....................................12
6.3 Extended diagnostic..................................12
7 Disassembly and disposal
7.1 Disassembly........................................12
7.2 Disposal...........................................12
8 Appendix
8.1 Contact............................................12
8.2 EC Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . .13
X.000 / v.A. / 03.2011 / BZ-Nr. 53501-9V900 / Teile-Nr. 1214172-EN / Ausgabe C

2
Operating instructions
Safety light grid
SLG 420
EN
turer. Detailed information regarding the range of applications can be
found in the chapter "Product description".
1.5 General safety instructions
Additional measures could be required to ensure that the electro-sensi-
tive device does not present a dangerous breakdown, when other forms
of light beams are available in a special application (e.g. use of wireless
control devices on cranes, radiation of welding sparks or effects of
stroboscopic lights).
The user must observe the safety instructions in this operating instruc-
tions manual, the country-specific installation standards as well as all
prevailing safety regulations and accident prevention rules.
Further technical information can be found in the Schmersal
catalogues or in the online catalogue on the Internet: www.
schmersal.net.
The information contained in this operating instructions manual is provi-
ded without liability and is subject to technical modifications
If multiple safety components are wired in series, the Perfor-
mance Level to EN ISO 13849-1 will be reduced due to the
restricted error detection under certain circumstances. The
entire concept of the control system, in which the safety com-
ponent is integrated, must be validated to EN ISO 13849-2.
There are no residual risks, provided that the safety instructions as well
as the instructions regarding mounting, commissioning, operation and
maintenance are observed.
1.6 Warning about misuse
In case of inadequate or improper use or manipulations of the
safety switchgear, personal hazards or damage to machi-
nery or plant components cannot be excluded. The relevant
requirements of the standards EN ISO 13855 (successor of
EN 999) and EN ISO 13857 must be observed.
1.7 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from
defective mounting or failure to comply with this operating instructions
manual. The manufacturer shall accept no liability for damages resul-
ting from the use of unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary re-
pairs, conversions and modifications to the device are strictly forbidden;
the manufacturer shall accept no liability for damages resulting from
such invasive work, arbitrary repairs, conversions and/or modifications
to the device.
2. Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
SLG 420-E/R
➀
-RF-
➁
No. Option Description
➀
Distance between outermost beams:
0500-02 500 mm, 2-beam
0800-03 800 mm, 3-beam
0900-04 900 mm, 4-beam
➁
Range 0.3 m ... 18 m
H Range 8 m ... 40 m
Only if the information described in this operating instructions
manual are realised correctly, the safety function and therefo-
re the compliance with the Machinery Directive is maintained.
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
the standard version.
2.3 Scope of delivery and accessories
2.3.1 Accessories included in delivery
Mounting kit MS-1030
The kit comprises 4 rotating mounting angles and 16 mounting screws
for fixing to the end caps.
2.3.2 Optional accessories
Centre fixing MS-1051
Consisting of 2 steel angles, 4 fixing screws and 4 T-slot nuts
Connecting cable for transmitter
Item number Designation Description Length
1207741 KA-0804 Female connector M12, 4-pole 5 m
1207742 KA-0805 Female connector M12, 4-pole 10 m
1207743 KA-0808 Female connector M12, 4-pole 20 m
Connecting cable for receiver
Item number Designation Description Length
1207728 KA-0904 Female connector M12, 8-pole 5 m
1207729 KA-0905 Female connector M12, 8-pole 10 m
1207730 KA-0908 Female connector M12, 8-pole 20 m
BUS converter NSR-0801
Converter for parametrization and diagnostics. Detailled information can
be found in the operating instructions manual of the NSR-0801.
Included in delivery: integrated connecting cable, PC-software USB
2.0 connection (L x W x H, 122 x 60 x 35 mm), indications of measure-
ments without cable
MSD4 Vibration damper
Kit consisting of: 8 vibration dampers 15 x 20 mm, 8 M5 cylinder head
screws with hexagon socket, 8 spring washers
The MSD4 vibration damper kit must be used for damping vibrations
and oscillations on the SLG 420. For applications with higher mecha-
nical stresses, e.g. presses, punching machines, we recommend the
MSD4 kit. In this way, the availability of the SLG 420 is increased.
2.4 Destination and use
The SLC 420 is a non-contact, self-testing safety guard, which is used
for the protection of hazardous points, hazardous areas and machine
accesses. If one or more light beams are interrupted, the hazardous
movement must be stopped.
The user must evaluate and design the safety chain in ac-
cordance with the relevant standards and the required safety
level.

3
SLG 420
Operating instructions
Safety light grid
EN
2.5 Technical data
Standards: EN 61496--1, CLC/TS 61496-2,
EN ISO 13849, EN 62061
Material of the enclosure: Aluminium
Number of beams: 2, 3, 4 beams
Protection field heights: 500 mm, 800 mm, 900 mm
Detection ability for test bodies:
2 beams with resolution 500 mm *1
3 beams with resolution 400 mm *1
4 beams with resolution 300 mm *1
Range of the protection field: 0,3 … 18,0 m
8,0 … 40,0 m
Response time: 2 - 4 beams:10 ms (Standard) 2 - 4 beams: 15
ms(beam coding A)
Rated operating voltage: 24 VDC ±10% (PELV) supply unit to
EN 60204 (power drop > 20 ms)
Operating current: 400 mA max. + 0.5 A (OSSD load + output signal
quality load)
Wave length of the sensor: 860 nm
Safety outputs (OSSD1, OSSD2): 2 x PNP-type semi-conductor,
short-circuit proof
Switching voltage HIGH¹: 15 V … 28,8 V
Switching voltage LOW¹: 0 V … 2 V
Switching current: 0 mA … 500 mA
Leakage current²: 1 mA
Load capacity: 2 µF
Load inductance: 2 H
Admissible conduction resistance
between OSSD and load: 2,5 Ω
Supply cable: 1 Ω
Contactor control (EDM)
Input voltage HIGH: 17 V … 29 V
Input voltage LOW: 0 V … 2,5 V
Input current HIGH: 3 mA … 10 mA
Input current LOW: 0 mA … 2 mA
Input restart interlock (manual reset)
Input voltage HIGH: 17 V … 29 V
Input voltage LOW: 0 V … 2,5 V
Input current HIGH: 3 mA … 10 mA
Input current LOW: 0 mA … 3 mA
Function: Protective mode, start and restart interlock
(manual reset), contactor control, beam blanking
Signal times
Contactor control: 50 ms … 500 ms, adjustable
Restart interlock (manual reset): 50 ms … 1,0 s, signal trans-
mission in case of trailing edge
Start interlock: 250 ms … 1500 ms, adjustable
LED indications transmitter: Transmitting, status
LED indications receiver: OSSD ON, OSSD OFF, restart, signal
reception, blanking, multifunction
Connection: M12 connector plug with metal thread, receiver
8-pole, transmitter 4-pole
Ambient temperature: −10° C … +50° C
Storage temperature: −25° C … +70° C
Interface: Diagnostics and function setting
Protection class: IP67 (IEC 60529)
Resistance to vibrations: 10 - 55 Hz to IEC 60068-2-6
Resistance to shock: 10 g; 16 ms; to IEC 60068-2-29
Year of construction: as of 2010 version 1.0
*1 resolution = beam distance + beam diameter 10 mm
²) In case of failure, the leakage current at the most flows to the OSSD
cable. The downstream control element must recognise this state as
LOW. A safety PLC must detect this state.
2.6 Response time (reaction time)
Standard version
The response time of the SLG 420 safety light grid depends on the
number of light beams and the beam coding A.
Resolution 14
Beams
[Number]
Beam
distance
[mm]
Respon-
se time
[ms]
Response time with
beam coding A
[ms]
Weight
[kg]
2 500 10 15 2.5
3 400 10 15 3.5
4 300 10 15 3.6
2.7 Safety classification
Standards: EN ISO 13849-1, EN 62061
PL: up to e
Control category: up to 4
PFH value: 7.42 x 10-9 / h
SIL: up to 3
Service life: 20 years
2.8 Functions
The system consists of a receiver and a transmitter. For the described
functions, no further switching elements are required. For the diag-
nostics and function selection, a user-friendly PC-software is offered as
accessory.
For the connection to a PC, the NSR-0801 BUS converter is required
(not included in delivery).
The system for the version SLC 420 has the following features:
• Protective mode (automatic start after release of the protected field)
• Start interlock
• Restart interlock (manual reset)
• Contactor control EDM
• Beam coding
• Blanking of one beam (only for 3- and 4-beam light grids)
Factory setting
The SLG 420 system features many functions without additional de-
vices. The following table includes an overview of the possible functions
and the configuration of the condition on delivery.
Function Factory setting Configuration
Protective mode not active External wiring
Restart interlock
(manual reset)
not active External wiring
Fixed blanking not active With BUS converter
NSR-0801 and PC-software
Contactor control not active With BUS converter
NSR-0801 and PC-software
Start interlock not active With BUS converter
NSR-0801 and PC-software
Beam coding not active With BUS converter
NSR-0801 and PC-software
2.8.1 Protective mode
The protective mode switches the OSSD outputs to ON state (protec-
tion field not interrupted), without external release of a switching device.
This type of protection generates an automatic restart of the machine if
the protection field is not interrupted.
This operating mode may only be chosen in conjunction with
the restart interlock (manual reset) of the machine.
This operating mode must not be chosen, when persons can
step behind the protection field.

4
Operating instructions
Safety light grid
SLG 420
EN
2.8.2 Restart interlock (manual reset)
The restart interlock (manual reset) prevents an automatic enabling of
the outputs (OSSD's ON state) after switch-on of the operating voltage
or an interruption of the protection field. The system switches the
outputs only to ON state, when an external command device (restart
button) generates an enabling signal at the restart input (receiver).
The command devices (enabling button) must be installed
outside of the hazardous area. The operator must have a
clear view on the hazardous area when actuating the enab-
ling button.
In supply condition, the restart interlock (manual reset)
neither the protective mode is active. You must choose one of
both operating modes to enable the OSSD outputs. If no type
of protection is selected, you will obtain the following signali-
sation through the LED status indication in the receiver: LED
OSSD OFF (red) + LED restart (yellow) flashing
2.8.3 Fixed blanking
The SLG 420 can blank stationary parts in the protection field.
4
3
2
1R1E1
Fixed blanking area
The fixed blanking range is authorised for individual beams in case of
obstacles, taking the protective function into account.
The first beam line, which realises the optical synchronisation and is
located immediately behind the diagnostic window, cannot be blanked.
The area of the fixed blanking must not be modified after the teach-
in process. Any change of the area or removal of the part from the
protection field will be detected by the system. As a result, the outputs
are disabled (locked). This locking can be cancelled by executing a new
teach-in process in accordance with the actual beam interruption.
The function is activated by means of the NSR-0801 BUS
converter and a PC or laptop. The activation of the function
is signaled by the LED blanking flashing in the diagnostic
window of the receiver.
• The blanking of beams is not authorised for an SLG 420
with 2 beams!
• The blanking of one beam at the most in the SLG 420
3-beam version or the SLG 420 4-beam version is autho-
rised, provided that the protective function is taken into
account.
• The blanking of multiple beams is not authorised.
• The remaining lateral areas must be protected against intru-
sion by means of mechanical covers.
• The lateral covers must be fixed with the object. Partial
covers are not authorised.
• The restart interlock (manual reset) function of the safety
light grid or the machine must be activated.
• The standard IEC/TS 62046 includes information, which
describes possibly required additional measures to prevent
a person from reaching a hazard through the blanking areas
of a protection field.
• After configuration, the protection field must be checked by
a responsible person by means of a test rod; in addition to
that, this person must compare the size of the blanked area
to the object size and if necessary provide for additional
covers or a larger distance of the safety guard with regard to
the hazardous point.
• The standard IEC/TS 62046 includes information, which
describes possibly required additional measures to prevent
a person from reaching a hazard through the blanking areas
of a protection field.
2.8.4 Contactor control (EDM)
The contactor control monitors the controlled switching elements
(auxiliary contacts of the contactors) of both outputs. This monitoring
is realised after each interruption of the protection field and prior to the
restart (enabling) of the outputs. In this way, malfunctions of the relays
are detected, e.g. contact welding or contact spring breakage. If the
light grid detects a malfunction of the switching elements, the outputs
are locked. After fault rectification, the operating voltage must be once
switched off and back on (power reset).
The contactor control is not activated upon delivery. This
function is activated by means of the NSR-0801 BUS conver-
ter and a PC or laptop.
Activation of the contactor control (EDM) without software
The contactor control can be activated without PC software as of firm-
ware version 1.23 in diagnostic mode by means of cable bridges (refer
to wiring diagram).
2.8.5 Start interlock
The start interlock prevents an automatic start of the machine when the
supply voltage is switched on. After enabling of the start interlock - by
the one-time interruption of the protection field -, this protective function
is deactivated until the next power reset.
The start interlock is not activated upon delivery. This function
is activated by means of the NSR-0801 BUS converter and a
PC or laptop.
2.9 Testing
The system performs a complete self-test and safety test within 2
seconds after the operating voltage has been switched on. If the protec-
tion field is not interrupted, the system switches to the ON condition.
In case of an error, the outputs at the receiver do not switch to the ON
state. The LED OSSD OFF starts flashing, thus emitting an error mes-
sage. Further indications can be found in the chapter Fault diagnostic.
During operation, the system continuously executes a self-test. Safety-
relevant faults are detected within the cycle time and cause the outputs
to be switched off.

5
SLG 420
Operating instructions
Safety light grid
EN
2.10 Beam coding
The beam coding of the safety light grid must be adjusted, when
systems operating in each other's vicinity and a set-up as shown in the
image below (no interference) is impossible.When supplied, the beam
coding is not active. With beam coding A, a receiver can distinguish the
beams of the transmitter with the same beam coding, which are desti-
ned to this particular receiver, from foreign beams. The beam coding A
must be set for each sensor (receiver and transmitter) individually. The
function is activated by means of the NSR-0801 BUS converter and a
PC or laptop.
If adjacent systems are operated without beam coding, the user is at
risk.
no interference
E ER R
Interference: beam coding required!
E RR E
• The beam coding increases the safety and avoids mutual interference
of adjacent systems.
• The beam coding increases the immunity against optical interference
(e.g. sun light, welding sparks).
• The beam coding A is permanently shown by the transmitter and the
receiver by means of flashing LED's (refer to LED status information).
The response time of the system is increased when beam
coding A is used. To this end, the safety distance must be
adjusted to the hazardous movement. Refer to chapter
Response time.
3. Mounting
3.1 General conditions
The following guidelines are provided as a preventative warning notice
to ensure safe and appropriate handling. These guidelines are an
essential part of the safety instructions and therefore must always be
observed and respected.
• The SLG 420 must not be used on machines, which can be
stopped electrically in case of emergency.
• The safety distance between the SLG 420 and a hazar-
dous machine movement must always be observed and
respected.
• Additional mechanical safety guards must be installed so
that the operator has to pass by the protection field to reach
the hazardous machine parts.
• The SLG 420 must be installed so that the personnel always
must be outside of the hazardous area when operating the
machine.
• An incorrect installation can lead to serious injuries. An
incorrect installation can lead to non-detected areas.
• Never connect the outputs to +24VDC. If the outputs are
wired to +24VDC, they are in ON state, as a result of which
they are unable to stop a hazardous situation occuring on
the application/machine.
• The safety inspections must be conducted regularly. The
SLG 420 must not be exposed to inflammable or explosive
gasses.
• The connecting cables must be connected in accordance
with the installation instructions. The fixing screws of the
end caps and the mounting angle must be firmly tightened.
• Additional measures could be required to ensure that the
electro-sensitive device does not present a dangerous
breakdown, when other forms of light beams are available in
a special application (e.g. use of wireless control devices on
cranes, radiation of welding sparks or effects of strobosco-
pic lights).
3.2 Protection field and approach
The protection field of the SLG 420 consists only of the available
individual beams with a distance of 300, 400 or 500 mm. Additional
protective devices must ensure that hazardous machine movements
can only be reached after passing through the protection field.
The SLG 420 must be installed to so that the hazardous area is com-
pletely protected, if necessary by means of additional safety guards.
The safety distance before the hazardous point to the SLG safety
guard must be imperatively respected. The safety distance enables the
presence of persons within the hazardous area. Therefore, it must be
ensured that the hazardous movement can only take place, when no
persons are inside the hazardous area anymore.
The legal and governmental provisions must be observed for the
operation and use. These provisions are usually region- and country-
dependent.
The command devices (enabling button) must be installed
outside of the hazardous area sot hat any operation from
within the hazardous area is prevented. The operator must
have a clear view on the hazardous area, when actuating the
command device (enabling button).
3.3 Alignment
Procedure:
1. The transmitter and the receiver must be fitted parallel to each other
and at the same height.
2. Turn the transmitter and monitor the diagnostic window of the recei-
ver. Fix the light grid, when the LED OSSD ON (green) is on and the
LED signal reception (orange) is off.
3. Determine the max. rotating angle to the left and to the right, at which
the LED OSSD ON (green) is on and tighten the mounting screws in
central position. Make sure that the LED signal reception (orange) is
not on or flashing.

6
Operating instructions
Safety light grid
SLG 420
EN
3.4 Safety distance
The safety distance is the minimum distance between the SLG 420 and
the hazardous point, which must be observed in order to ensure that
the hazardous point can only be reached after the hazardous move-
ment has come to standstill.
The protection using individual beams must be chosen so
that bodies or body parts larger than the selected resolution
(beam distance + beam diameter 10 mm) of the SLG 420 are
detected.
Calculation of the safety distance to EN ISO 13855 (successor of
EN 999) and EN ISO 13857
The safety distance depends on the following elements:
• Run-on time of the machine (calculation by run-on time measurement)
• Response time of the machine and the safety light grid and the
downstream relay (entire safety guard)
• Approach speed
• Resolution of the safety light grid
Calculation of the safety distance for the multi-beam light grid:
S = (1600 mm/s * T) + 850mm
S = Safety distance [mm]
T = Total reaction time (machine run-on time, reaction time of the safety
guard, relays, etc.)
K = Approach speed 1600 mm/s
C = Safety supplement 850 mm
Example:
Reaction time of the SLG 420 = 10 ms
Run-on time of the machine T = 170 ms
S = 1600 mm/s * (170 ms + 10 ms) + 850 mm
S = 1138 mm
The following mounting heights must be observed:
Number of beams Mounting height above reference oor in mm
2400, 900
3300, 700, 1100
4300, 600, 900.1200
The formulae and calculation examples are related to the vertical set-up
(refer to drawing) of the safety light grid with regard to the hazardous
point.Please observe the applicable harmonised EN standards and
possible applicable national regulations.
The safety distance between the safety light grid and the
hazardous point must always be respected and observed.
If a person reaches the hazardous point before the hazar-
dous movement has come to standstill, he/she is exposed to
serious injuries.
Safety distance to the hazardous area
SHazardous point
Transmitter
Receiver
Command device
Authorised operation
Mechanical protection
Direction from which the
hazardous area is accessed
The above-mentioned formula may only be used for the vertical set-up
(refer to drawing) of the light curtain with regard to the hazard point.
The successor standards of the EN 999 for calculating the
minimum distances of the safety guards with regard to the
hazardous point are EN ISO 13855 and EN ISO 13857.
3.5 Minimum distance to reflecting surfaces
During the installation of the safety light grid, the effects of reflecting
surfaces must be taken into account. In case of an incorrect installati-
on, interruptions of the protection field could possibly not be detected,
which could lead to serious injuries. The hereafter-specified minimum
distances with regard to reflecting surfaces (metal walls, floors, ceilings
or parts) must be imperatively observed.
8° 8°
a= 262 mm
Access direction
Receiver
Obstacle
optical axis
Transmitter
reflecting body
(e.g. material container)
Limit of the hazardous point
a=130mm
5° 5°
Safety distance a to reflecting surfaces
a [mm]
D [m]
0 3 5 10
100
200
300
400
500
600
700
800
900
1000
15 20
Calculate the minimum distance to reflecting surfaces as a function of
the distance with an aperture angles of ± 2.5° degrees or use the value
from the table below
Distance between transmitter and receiver
[m]
Minimum distance
a [mm]
0.2 … 3.0 130
4 175
5 220
7 310
10 440
15 660
Formula: a = tan 2.5° x L [mm]
a = Minimum distance to reflecting surfaces
L = Distance between transmitter and receiver

7
SLG 420
Operating instructions
Safety light grid
EN
3.6 Dimensions
All measurements in mm.
SLG 420 2-beam version
SLG 420-E/R0500-02-RF
48.749.6
L2
80
42
L1
51
B
C
31.5
6
A97
86
A B C L1 L2
500 648 684 349 303
L1 = Mounting distance (mm) between floor and slotted hole centre
(short end cap)
L2 = Mounting distance (mm) between floor and slotted hole centre
(diagnostic window)
SLG 420 3-beam version
SLG 420-E/R0800-03-RF
48.749.6
L2
80
42
L1
51
B
C
31.5
6
A A 97
86
A B C L1 L2
400 948 984 249 203
L1 = Mounting distance (mm) between floor and slotted hole centre
(short end cap)
L2 = Mounting distance (mm) between floor and slotted hole centre
(diagnostic window)
Fixing kit MS-1030
The fixing kit consists of 4 steel angles and 16 fixing screws.
14,5
42
18,9
20
6,5
40
32
52

8
Operating instructions
Safety light grid
SLG 420
EN
SLG 420 4-beam version
SLG 420-E/R0900-04-RF
48.749.6
L2
80
42
L1
91
B
C
31.5
6
A A A 97
86
A B C L1 L2
300 1088 1124 209 203
L1 = Mounting distance (mm) between floor and slotted hole centre
(short end cap)
L2 = Mounting distance (mm) between floor and slotted hole centre
(diagnostic window)
Centre fixing MS-1051 (optional accessory)
Mounting kit consists of 2 steel angles, 4 screws and 4 T-slot nuts for
central fixing
40
42
20
14,5 18,9
32
20
38

9
SLG 420
Operating instructions
Safety light grid
EN
4. Electrical connection
4.1 Wiring example default
5
Kn 1
Kn 2
S 1
K 1 K 2
6182734
Schützkontrolle/EDM (RD)
DIAG IN (WH)
DIAG IN (GY)
DIAG OUT (PK)
Freigabe WA (WH)
DIAG OUT (BK)
0 V DC (BU)
0 V DC (BU)
OSSD 1 (GN)
OSSD 2 (YE)
+24 V DC (BN)
+24 V DC (BN)
Brücke 1
Brücke 2
Erdung
E 1
Nur für Diagnose
1
23
4
DIAG IN (WH) DIAG OUT (BK)
Only for diagnostic
DIAG IN (GY)
Bridge 1
DIAG OUT (PK)
+24 VDC (BN) 0 VDC (BU)
Release manual (WH)
Bridge 2
+24 VDC (BN)
Contactor control/EDM (RD)
OSSD 2 (YE) OSSD 1 (GN) 0 VDC (BU)
Earth connection
Restart interlock (manual reset) (bridge 1)
By bridging DIAG IN (pin 5) and DIAG OUT (pin 6), the restart interlock
(manual reset) is activated.
Protective mode (bridge 2)
By bridging DIAG OUT (pin 6) and authorised operation (pin 1), the
protective mode is activated.
K1, K2: Relay for processing the switching outputs OSSD
1,OSSD 2
Kn1, Kn2: Auxiliary contacts of the last switching relay (optional)
S1: Command device for restart (optional)
E1: Power supply 24 VDC ± 10%
To ensure correct functionality, an operating mode (restart
interlock or protective mode) must be selected.
Upon delivery, the "contactor control" function is deactiva-
ted. The function is activated by means of the NSR0801
BUS converter and the PC software.
4.2 Activation of the contactor control (EDM) without software
The contactor control can be activated without PC software as of firm-
ware version 1.23 in diagnostic mode by means of cable bridges (refer
to wiring diagram).
To activate the EDM function without PC software, proceed in the
following way:

10
Operating instructions
Safety light grid
SLG 420
EN
Establish the connections in accordance with the wiring diagram,
see below, with two cable bridges
Both outputs OSSD1 and OSSD2 of the light curtain must
be separated from the machine control.
1) Wire OSSD 1 + 2 to 24 V (pin 2 + 3 + 4)
2) Wire DIAG_IN to DIAG_OUT (pin 5 + 6)
3) Wire S1 or enabling button WA between pin1 and pin2
S1
E1
24VDC
561 82734
grey pink white red brown blue green yellow
Execute the parameter assignment according to the following
instructions:
1. Power ON
2. The light curtain detects faults and the EDM programming mode is
activated.
3. Red LED flashes for 10 seconds at 2 Hz and blue LED shows during
this period of time the current EDM state (supply state: OFF = EDM
not active).
4. The EDM programming is realised, when at the same time three
impulses are emitted by button S1 at 24V. Impulse duration ON time
> 200 ms, OFF time > 200 ms
5. A successful EDM programming is confirmed by the green LED flashing
three times (1Hz). During this time, the blue LED shows the new EDM
state (ON = EDM active). After that, the OSSD fault mode of the light
curtain is activated. The red LED flashes four times. If the EDM pro-
gramming was not successfull or timed out, the OSSD fault mode of the
light curtain is immediately activated. The red LED flashes four times.
6. Power OFF
7. Remove cable bridges PIN 2 + 3 + 4 and if necessary cable bridge
PIN 5 + 6
8. Wire OSSD 1 + 2 (pin 3 + 4)
9. Power ON
To reverse the EDM function, repeat the procedure step 2...7.
If the programming was not successful, the procedure can also be
repeated.
The state of the EDM function is shown in diagnostic mode through the
blue LED (ON = EDM active).
An EDM function, which is deactivated by means of the PC
software, can not be activated in this way.
4.3 Connector configuration Receiver, Emitter & Cable
RECEIVER
SLG: connector male
M12 / 8 pole
Signal
Designation Description
5
8
4
3
2
1
7
6
1 WH Restart Input
2 BN 24 V DC Power supply
3 GN OSSD 1 Safety output 1
4 YE OSSD 2 Safety output 2
5 GY Diagnostic IN Input diagnostic data
6 PK Diagnostic OUTOutput diagnostic data
7 BU 0 V DC Power supply
8 RD Contactor
control EDM
Input
Cable: Connector female
M12 / 8 pole
5
8
4
3
21
7
6
TRANSMITTER
SLG: connector male
M12 / 4 pole
Signal
Designation Description
3
2
1
4
1 BN 24 V DC Power supply
2 WH Diagnostic IN Input diagnostic data
3 BU 0 V DC Power supply
4 BK Diagnostic OUT Output diagnostic data
Cable: Connector female
M12 / 4 pole
3
21
4
The colour codes are only valid for the cable types mentioned
below "optional accessories".
5. Set-up and maintenance
5.1 Check before start-up
Prior to start-up the SLG 420, the following items must be checked by
the responsible person.
Wiring check prior to start-up
1. The voltage supply is a 24V direct current power supply, which meets
the CE Directives, Low Voltage Directives. A power downtime of 20
ms must be bridged.
2. Presence of a voltage supply with correct polarity at the SLG 420.
3. The connecting cable of the transmitter is correctly connected to the
transmitter and the connecting cable of the receiver correctly to the
receiver.
4. The double insulation between the light grid output and an external
potential is guaranteed.
5. The outputs OSSD1 and OSSD2 are not connected to +24 VDC.
6. The connected switching elements (load) are not connected to +24
VDC.
7. If two or more SLG 420 are used within close range compared to
each other, an alternating arrangement must be observed. Any
mutual interference of the systems must be prevented (see chapter
"Beam coding") .
Switch the SLG 420 on and check the operation in the following
way:
The component performs a system test during approx. 2 seconds after
the operating voltage has been switched on. After that, the outputs are
enabled (if the protection field is not interrupted). The LED "OSSD ON"
of the receiver is on.
In case of incorrect functioning, please follow the instructions
listed in the chapters Indication and Fault diagnostic.

11
SLG 420
Operating instructions
Safety light grid
EN
5. Hazardous machine parts do not move when the protection field is
interrupted.
6. The hazardous machine movement comes to standstill, when the
voltage supply of the SLG 420 is switched off.
5.4 Half-yearly inspection
The following items must be checked every six months or when a ma-
chine setting is changed.
1. Machine stops or does not inhibit any safety function.
2. No machine modification or connection change, which affects the
safety system, has taken place.
3. The outputs of the SLG 420 are correctly connected to the machine.
4. The total response time of the machine does not exceed the respon-
se time calculated during the first putting into operation.
5. The cables, the connectors, the caps and the mounting angles of the
GLS 420 are in perfect condition.
5.5 Cleaning
If the optics cover of the sensors is extremely soiled, the OSSD outputs
of the SLG 420 can be disabled. Clean with a soft cloth without exer-
cising pressure. The use of agressive, abrasive or scratching cleaning
agents, which could attack the surface, is prohibited.
5.2 Maintenance
Do not use the SLG 420 before the next inspection is termi-
nated. An incorrect inspection can lead to serious and mortal
injuries.
Conditions
For safety reasons, all inspection results must be archived. The opera-
ting principle of the SLG 420 and the machine must be known in order
to be able conducting an inspection. If the fitter, the planning technician
and the operator are different persons, please make sure that the user
has the necessary information at his disposal to be able conduct the
maintenance.
5.3 Regular check
A regular visual inspection and functional test, including the following
steps, is recommended:
1. The safety light grid does not have any visible damages.
2. The optics cover is not scratched or soiled.
3. Hazardous machinery parts can only be accessed by passing
through the protection field of the SLG 420.
4. The safety distance of the application exceed the mathematically
calculated one.
Operate the machine and check whether the hazardous movement
stops under the hereafter-mentioned circumstances.
6. Diagnostic
6.1 LED status information
Receiver Function LED colour Description
Multifunction
Blanking
Signal reception
Restart
OSSD OFF
OSSD ON
Protection field
Multifunction green Function display, beam coding
Blanking blue Protection field(s) inactive (blanking)
Signal reception orange Safety-monitoring module of signal reception
Restart yellow Input for command device
OSSD OFF red Safety outputs signal condition OFF
OSSD ON green Safety outputs signal condition ON
Transmitter Function LED colour Description
Transmitting Status
Protection field
Transmitting orange Transmitter active
Status green Function display, beam coding
Receiver
LED Status LED Description
OSSD ON ON Protection field clear
Flashing Diagnostic mode active
OSSD OFF ON Protection field interrupted, system or configuration error
Flashing Diagnostic mode active, error output refer to Fault diagnostic table
Restart ON Start or restart interlock (manual reset) active, signal expected at output WA
Signal reception ON/flashing Signal reception too low, check alignment and installation height between transmitter and receiver
Cleaning the black profile cover
OFF Alignment between transmitter and receiver OK
Blanking 1 flashes Fixed beam blanking
Multifunction Flashing Beam coding A is active
Transmitter
LED Status LED Description
Transmitting ON Standard operation, transmitter active
Flashing Configuration error
Status Flashing Beam coding A is active

12
Operating instructions
Safety light grid
SLG 420
EN
6.2 Fault diagnostic
The light grid performs an internal self-test after the operating voltage is switched on and the protection field is enabled. When a fault is detected, a
corresponding flashing pattern is emitted at the receiver through the LED OSSD OFF (red). Every fault emission is followed by a one-second pause.
LED OSSD OFF Fault feature Action
OSSD OFF and LED restart
continuous flashing
Wiring error for function selection
(Restart interlock, automatic mode)
Check connection at the receiver, bridge 1 or
bridge 2 must be wired (refer to Wiring)
1 flashes Error at receiver Replace receiver
2 flashes Error contactor control OFF Check connections at contactor control input, check wiring of the
auxiliary contacts
3 flashes Error contactor control ON Check wiring at contactor control input, short-circuit at +UB and
mass. Power reset after fault rectification.
4 flashes Errors at the OSSD outputs Check the wiring of the outputs, OSSD for short-circuit at +UB and
mass
5 flashes Error configuration data Check the configuration settings by means of the NSR-0801 BUS
converter
6 flashes Error blanking The receiver has detected blanked beams as beams without inter-
ruption, i.e. locking. Check the configuration settings by means of the
NSR-0801 BUS converter, repeat the teach process with blanking.
6.3 Extended diagnostic
By means of the optional configuration software SLG 420 and the NSR-0801 BUS converter, an extended diagnostic can be executed. The software
provides the status information of the component and can represent the individual light lines. This feature enables an optimal adjustment of the light
grid. The diagnostic mode is signalled by the OSSD ON and OSSD OFF LED‘s at the receiver. In diagnostic mode, protective mode is disabled,
the ODDS outputs being locked. The change from diagnostic mode to protective mode is automatically realised after Power Reset, when the BUS
converter is no longer integrated and the connecting cable of the sensor is reconnected.
7. Disassembly and disposal
7.1 Disassembly
The safety switchgear must be disassembled in a de-energised condi-
tion only.
7.2 Disposal
The safety switchgear must be disposed of in an appropriate manner in
accordance with the national prescriptions and legislations.
8. Appendix
8.1 Contact
Consultancy / Sales:
K.A. Schmersal GmbH
Industrielle Sicherheitsschaltsysteme
Möddinghofe 30
D-42279 Wuppertal
Tel:[phone]
Fax:[phone]
You will also find detailed information regarding our product variety on
our website: www. schmersal.com
Repair handling / shipping:
Safety Control GmbH
Am Industriepark 11
D-84453 Mühldorf/ Inn
Tel.: [phone]
Fax: [phone]

13
SLG 420
Operating instructions
Safety light grid
EN
SLG 420-B-EN
Appendix
The currently valid declaration of conformity can be down-
loaded from the internet at www.schmersal.net.
8.2 EC Declaration of conformity
Name of the safety component / type: SLG 420
Description of the safety component: Safety light grid
Harmonised EC-Directives: 2006/42/EC EC-Machinery Directive
2004/108/EC EMC-Directive
Applied standards: EN 61496-1:2004 + A1 2008
CLC/TS 61496-2:2006
EN ISO 13849-1:2008; PL e
EN 62061:2005; SIL 3
Person authorized for the compilation
of the technical documentation:
Ulrich Loss
Möddinghofe 30
42279 Wuppertal
Notied body for the prototype test: TÜV Nord Cert GmbH
Langemarckstr.0
45141 Essen
ID n°: 0044
EC-prototype test certicate: n° 44 205 10 555867 005
Place and date of issue: Wuppertal, February 1, 2010
Authorised signature
Christian Spranger
Managing Director
Authorised signature
Klaus Schuster
Managing Director
EC Declaration of conformity
Translation of the original declaration of conformity Safety Control GmbH
Am Industriepark 33
84453 Mühldorf / Inn
Germany
We hereby certify that the hereafter described safety components both in its basic design and const-
ruction conform to the applicable European Directives.

Safety Control GmbH
Am Industriepark 33
D-84453 Mühldorf / Inn
Telefon +49 - (0)86 31 - 187 - 9 60
Telefax +49 - (0)86 31 - 187 - 9 61
E-Mail: [email protected]