Datasensing LP4 Manuale utente

LP4 SAFETY LIGHT CURTAIN 
806000200 Rev. B • 11/2022 1 
 
 
Datasensing S.r.l. 
Strada S. Caterina, 235 
41122 Modena Italy 
Tel. +39 059 420411 
Fax +39 059 253973 
www.datasensing.com 
English 
SAFETY LIGHT CURTAIN LP4 
SUMMARY 
INTRODUCTION ...........................................................................................................................................2 
PRINCIPLE OF OPERATION......................................................................................................................3 
LIGHT CURTAIN ...................................................................................................................................................... 3 
MUTING FUNCTION ............................................................................................................................................... 4 
LP4ER_M model–external sensors 3 selectable methods of Muting. ............................................................4 
LP4ER_M models used with “L” operational logic .................................................................................................6 
INSTALLATION.............................................................................................................................................6 
POSITIONING ........................................................................................................................................................... 8 
POSITIONING OF THE MUTING SENSORS (“LP4ER_M” SERIES).....................................................................8 
CALCULATION OF THE SAFETY DISTANCE .......................................................................................................... 10 
VERTICAL POSITIONING OF THE LIGHT CURTAIN ........................................................................................... 11 
MULTIPLE SYSTEMS ....................................................................................................................................................... 13 
DISTANCE FROM REFLECTIVE SURFACES............................................................................................................ 13 
LIGHT SIGNALS......................................................................................................................................................15 
Emitter SIGNALS ............................................................................................................................................................... 15 
Receiver SIGNALS............................................................................................................................................................. 16 
ELECTRICAL CONNECTIONS AND CONNECTORS .......................................................................................18 
EMITTER CONNECTIONS (Male Connector)......................................................................................................... 18 
RECEIVER CONNECTIONS (Main Connector - Male) ......................................................................................... 19 
CONNECTOR M12 n. 1 (for muting sensor) (“LP4ER_M” MODELS) (Female Connector).................. 20 
CONNECTOR M12 n. 2 (for muting sensor) (“LP4ER_M” MODELS) (Female Connector).................. 20 
RECEIVER CONNECTIONS J LR M12 MODELS...................................................................................................... 21 
SELECTION OF CONFIGURATION AND OPERATING MODE ....................................................................21 
SELECTION FEEDBACK EXTERNAL CONTACTORS K1/K2............................................................................. 21 
SELECTION OF MANUAL/AUTOMATIC FUNCTIONING ................................................................................... 22 
SELECTION OF THE MAXIMUM DURATION AND TYPE OF MUTING ......................................................... 23 
OVERRIDE CONFIGURATION ...................................................................................................................................... 23 
MUTING OVERRIDE FUNCTION (“LP4ER_M” MODELS) .................................................................................. 24 
"SYSTEM STATUS" OUTPUT (“M” MODELS) ......................................................................................................... 25 
TEST FUNCTION................................................................................................................................................................ 25 
SAFETY MODULES MJB1 - MJB2 - MJB3 - MJB4................................................................................................... 25 
EXAMPLE OF CONNECTION WITH EXTERNAL CONTACTORS K1/K2 WITH start/restart interlock 
activated ............................................................................................................................................................................... 26 
EXAMPLE OF CONNECTION WITH AD SB300 WITH start/restart interlock activated ..................... 27 
MUTING STATUS AND LIGHT ("LP4ER_M" MODELS) ................................................................................... 27 
CONFIGURATION AND OPERATION MODES LP4ER_L12 ........................................................................28 
AUTOMATICO MODE....................................................................................................................................................... 28 
MANUAL MODE................................................................................................................................................................. 29 
DIMENSIONS .............................................................................................................................................. 30 
LP4ER_M & LP4ER_L............................................................................................................................................30 
TECHNICAL DATA .................................................................................................................................... 31 
CHECKS AND MAINTENANCE ...........................................................................................................................34 
TROUBLESHOOTING ...........................................................................................................................................35 
ACCESSORIES .........................................................................................................................................................37 
COMPLIANCE ............................................................................................................................................. 38 
GUARANTEE............................................................................................................................................... 38 
 

LP4 SAFETY LIGHT CURTAIN

2 806000200 Rev. B • 11/2022

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

5BOriginal Instructions (ref. 2006/42/EC)

INTRODUCTION

This symbol indicates an important personal safety warning. Failure to comply with

the warning may result in very high risks for exposed personnel.

The LP4 safety light curtain is a multi-beam opto-electronic safety system of the Type 4 category

of electro-sensitive devices (in accordance with IEC 61496-1; EN 61496-2 and complies with the

requirement of the EU Machinery Directive 2006/42/EC) –if necessary equipped with MUTING

function (“M” models) - for the protection of persons exposed to dangerous machines or plants.

The two PNP auto-controlled static outputs permit connection of the light curtain to a control

system complying with the requirements and level of safety required for the application.

The light curtain integrates the start/restart interlock and EDM functions (control of external relays

K1 and K2). In this way, the light curtain can be connected to a simple pair of relays or external

safety contactors without having to install additional modules.

A diagnostic display on the Emitter and Receiver provides the information required for correct use

of the device and to check for any operating faults.

The diagnostic output (see TROUBLESHOOTING, page 35) makes it possible to obtain weak signal

and light curtain status information from a single wire.

LP4 is ideal for protecting:

•automatic palletizing/depalletizing systems

•materials handling and storage systems;

•packing and packaging machines;

•assembly lines;

•industrial automatic warehouses;

•AGV transit openings;

•metal, wood, marble and glass tool machines;

•presses, die cutting machines.

For problems regarding safety, if necessary, consult the competent safety authorities

of your country or the related industrial association.

For applications in the food industry, consult the manufacturer to check compatibility

between the materials of the light curtain and the chemical agents used.

The guarding function of opto-electronic safety devices is not effective in the case in

which the machine cannot be electrically controlled and is unable to stop the

dangerous movement immediately at any time during the work cycle.

LP4 SAFETY LIGHT CURTAIN

806000200 Rev. B • 11/2022 3

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

PRINCIPLE OF OPERATION

LIGHT CURTAIN

If the area guarded is clear, the two outputs on the Receiver are active and permit normal

functioning of the machine connected to these.

When an object larger than or equal to the resolution of the system interrupts the sensing

field of one or more beams, the Receiver de-activates its outputs.

This condition makes it possible to block the dangerous movement of the machine (using

a suitable machine stop circuit).

Resolution is the smallest diameter object that will be reliably detected by at least one of

the optical beams generated by the light curtain (Figure 1).

Figure 1- Light curtain resolution

Resolution is constant regardless of working conditions as it depends only on the

geometrical characteristics of the lenses and the center distance between two adjacent

lenses. The height of the guarded area is the height effectively protected by the safety light

curtain.

If the curtain is positioned horizontally, this value indicates the depth of the guarded zone.

The useful range is the maximum operating distance that can exist between the Emitter

and Receiver.

LP4 is available with the following resolutions (MODEL “LP4ER_M”) :

•30mm (protected heights from 300mm to 1200mm) (“LP4ER_M” models):

PROTECTION OF THE HANDS.

•40mm (protected heights from 300mm to 1800mm) (“LP4ER_M” and LP4ER_L

models):

PROTECTION OF THE HANDS.

•90mm (protected heights from 300mm to 1800mm) (“LP4ER_M” models):

PROTECTION OF THE LIMBS.

LP4 is also available in a Multibeam version (LP4ER, LP4ER_M, LP4ER_L and LP4ER_ML) with

a pitch between the lenses of:

•500mm (2 beams), 400mm (3 beams), 300mm (4 beams only models “LP4ER_M).

PROTECTION OF THE BODY.

P = Pitch between two lenses

D = Diameter of one lens

R = Resolution = P+D

Emitter

Receiver

Opaque Object

LP4 SAFETY LIGHT CURTAIN

4 806000200 Rev. B • 11/2022

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

MUTING FUNCTION

The Muting function is a temporary suspension of the safety light curtain’s protective

function. Carefully check your risk analysis in order to assess whether the Muting

function is compatible with your application and what additional measures have to be

taken.

The Muting function generates a temporary, automatic interruption of safety light curtain

functioning in order to permit normal transit of material through the guarded opening.

The Muting function is activated when the system detects the object that interrupts the opening

protected. In other words, when the system recognizes the material and distinguishes between this

and any operator (in a potentially dangerous situation), it is enabled to bypass the light curtain

temporarily, allowing the material to pass through the opening.

The Muting sensors external (model “LP4ER_M”)form the sensing system that decides whether the

Muting function is to be activated (or not). Control of the dangerous opening can be de-activated

only by a correct sequence of interruption of the beams of the Muting sensors.

The LP4 system is available in models to which 2 or 4 sensors of various type can be connected

(proximity, optical, capacitive etc).

LP4ER_M MODEL–external sensors

3 selectable methods of Muting.

The “LP4ER_M” model can use 2 or 4 sensors that must be

connected to the M12 connectors on the front part of the

vertical light curtain. These sensors may be of various types

(proximity, optical, capacitive with PNP or electromechanical

type output and with DARK-ON switching (i.e. output active

when material is present).

If 4 sensors are connected, it is possible to choose two

methods of operation: 1) Concurrent; 2) Sequential.

CONNECTION WITH 2 EXTERNAL SENSORS (Figure 2)

This model is two-way and is useful for protecting pallet

entrance/exit openings.

The point of intersection of the two sensors must be

located inside the dangerous area to prevent

accidental and dangerous activation of the Muting

function.

The Muting function is activated following concurrent

interruption (within max. 4s) of sensors S1 and S2. The Muting

function continues as long as both sensors are occupied.

When the first of the two sensors is cleared, the Muting

function is disabled.

Also for this model, the maximum duration of the Muting

condition (timeout) can be set to 30 seconds or 90 minutes.

Figure 2

Emitter

Receiver

Sensor 1

Sensor 2

DANGEROUS

AREA

LP4 SAFETY LIGHT CURTAIN

806000200 Rev. B • 11/2022 5

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

CONNECTION WITH 4 EXTERNALSENSORS

Using 4 sensors, two methods of operation are possible:

Sequential (figure 7)

The Muting function is activated following sequential

interruption of sensors S1 and S2 and of sensors S3 and S4. It

is important to remember that, for correct actuation of the

Muting function, the sequence indicated in Figure 4 and

Table 1 is required (without time restrictions).

It is also possible to enable a control of the activation time of

the 4 sensors.

Concurrent

The Muting function is activated following concurrent

interruption of sensors S1 and S2 (within maximum 4sec) (or

S4 and S3 with material transiting in the opposite direction).

Muting status ends after clearing of the opening and of S3

(or S2 with material transiting in the opposite direction).

➔The LP4ER_M models connected with 4

external sensors, have two available timeouts:

1) 30 sec; 2) infinite.

Figure 3

sensor1

sensor2

sensor3

sensor4

Muting

30 s/

Figure 4

Sequential muting: activation sequence.

SENSOR 1

SENSOR 2

SENSOR 3

SENSOR 4

LIGHT CURTAIN STATUS

LIGHT CURTAIN ACTIVE

MUTING

LIGHT CURTAIN ACTIVE

Table 1

LEGEND:

0 = SENSOR FREE; 1 = SENSOR ENGAGED

Both operating modes with 4 sensors are TWO-WAY.

The correct Muting sequence can start either from sensor 1 or from sensor 4.

SENSOR 1

SENSOR 2

SENSOR 3

SENSOR 4

MUTING

ENGAGED

CLEAR

Emitter

Receiver

Sensor 4

Sensor 3

Sensor 2

Sensor 1

LP4 SAFETY LIGHT CURTAIN

6 806000200 Rev. B • 11/2022

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

LP4ER_M MODELS USED WITH “L” OPERATIONAL LOGIC

In this model the sensors 1 and 2 are on the same side with respect to the vertical curtain and are

positioned in front of the dangerous opening (Figure 5 and Figure 6). This model is unidirectional

and is useful for protecting openings with pallet exit.

The activation of the Muting function takes place following the simultaneous interruption (within

max. 4 sec) of sensors S1 and S2. The Muting function remains while both sensors are occupied.

On release of the first of the 2 sensors, the material will still have 4 seconds available to abandon

the protected area delimited by the curtain. The Muting condition will be disabled as soon as the

protected area is released.

If the curtain is still occupied after the 4 seconds, the OSSD outputs are disabled, interrupting

machine functioning.

For this model, the maximum duration of the Muting condition (timeout) can be selected in 30

seconds or 90 minutes (Table 12).

➔It is indispensable that a Muting sequence is completed (release of controlled area)

in order to guarantee the correct activation of the successive sequence.

For safe functioning of the MI series (with L logic), it is necessary that the muting

sensors are positioned inside the dangerous area (traced in Figure 5 and Figure 6).

Figure 5 - Crossed sensors

Figure 6 - Parallel sensors

INSTALLATION

Before installing the LP4 safety system, check that:

The safety system is used only as stopping device and not as machine control device.

The machine can be controlled electrically.

Any dangerous action of the machine can be promptly interrupted. In particular, the

stopping time of the machine must be known, if necessary measure this.

The machine must not cause dangerous situations due to flying or dropping of

material; otherwise, additional mechanical guards are required.

The minimum size of the object that must be detected must be greater than or equal to the

resolution of the model selected.

DANGEROUS

AREA

Emitter

Receiver

Sensor 2

Sensor 1

DANGEROUS

AREA

Emitter

Receiver

Sensor 2

Sensor 1

LP4 SAFETY LIGHT CURTAIN

806000200 Rev. B • 11/2022 7

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

Knowing the shape and dimensions of the dangerous area, it is possible to assess the width

and height of its access area:

Compare these dimensions with the maximum useful range and the height of the area protected

of the model used.

Before positioning the safety device, take into account the following general indications:

Check that the temperature of the environments where the system is installed is compatible with

the temperature operating parameters indicated in the technical data.

Do not position the Emitter and Receiver close to sources of bright light or high intensity flashing

lights.

Particular environmental conditions may impair the detection efficiency of light curtains. In

places with the possibility of mist, rain, fumes or dust, for correct functioning of the equipment

it is advisable to apply suitable correction factors Fc to the values of useful operating range.

In these cases:

Pu = Pm x Fc

where Pu and Pm are respectively the useful and maximum operating range in

meters.

The recommended Fc factors are indicated in the table below.

ENVIRONMENTAL

CONDITION

CORRECTION FACTOR Fc

Mist

0,25

Vapors

0,50

Dust

0,50

Dense fumes

0,25

Table 2

If the device is installed in areas liable to sudden changes in temperature, suitable measures

must be taken in order to avoid formation of condensation on the lenses, which could impair

detection efficiency.

If LP4 light curtains are used with palletizers, depalletizers and stacking/destacking machines

for empty pallets, refer to European standard EN 415-4.

LP4 SAFETY LIGHT CURTAIN

8 806000200 Rev. B • 11/2022

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

POSITIONING

Protection of the guarded opening by LP4 must be integrated with suitable mechanical guards.

POSITIONING OF THE MUTING SENSORS (“LP4ER_M” SERIES).

2 sensors

The Emitter and receiver of the light curtain must be positioned so as to permit access to the

dangerous area from above, from below and from the sides without first of all intercepting at least

one of the optical beams.

Indications for correct positioning of the light curtain are provided in the figure below.

Figure 7

For correct positioning of sensors 1 and 2, i.e. those that manage enabling and disabling of the

Muting function, take into account the following:

•the two beams must be crossed and pass diagonally through the zone guarded by the

light curtain;

•the point of intersection of the two beams must be in the dangerous area beyond the

light curtain;

•the angle between the two Muting beams must be calculated according to the size of

the pallet and its speed, taking into account that the Muting function is activated only

if the interception delay between the two sensors is less than 4 seconds;

•the pallet must interrupt the two beams before intercepting the light curtain;

•the two beams must be interrupted continuously by the pallet for the entire period

during which the pallet passes between the sensors;

•make sure that the two beams are effectively intercepted by the material on the pallet

and not by the empty pallet;

•the zone identified by the points of interception and clearing of the beams of sensors 1

and 2 by pallet must be limited as far as possible (or suitably protected) so as to

avoid the possibility of accidental passing through the light curtain with Muting active

(Figure 8).

S1 = Sensor 1

S2 = Sensor 2

R1 = Reflector 1 (or Receiver 1)

R2 = Reflector 2 (or Receiver 2)

B = Light curtain

Material

Dangerous area

LP4 SAFETY LIGHT CURTAIN

806000200 Rev. B • 11/2022 9

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

Figure 8

4 sensors

For correct positioning of sensors 1, 2, 3 and 4, i.e. those that manage enabling and disabling

of the Muting function, take into account the following:

Figure 9

SEQUENTIAL (Figure 4, Figure 9 Table 1):

•the distance between the first and the

last sensor must never exceed the

length of the pallet (in one of the

phases of the sequence, the 4

sensors must all be intercepted

simultaneously);

•the pallet must interrupt sensors S1

and S2 (or S4 and S3 in the opposite

direction) before intercepting the

light curtain;

•make sure that the two beams are

intercepted by the material on the

pallet and not by the empty pallet

Figure 10

CONCURRENT (Figure 10):

•The Muting function is activated

following concurrent interruption

(within max. 4 sec) of sensors S1

and S2 (or S4 and S3 in the opposite

direction).

•also in this operating mode, for

correct activation of the Muting

function, for a short period of time,

all 4 sensors must be intercepted

simultaneously.

Dimension to be reduced to a minimum

Mechanical guards

Material

DANGEROUS

AREA

Mechanical guards

DANGEROUS

AREA

Material

Mechanical guards

DANGEROUS

AREA

Material

LP4 SAFETY LIGHT CURTAIN

10 806000200 Rev. B • 11/2022

Datasensing S.r.l.

Strada S. Caterina, 235

41122 Modena Italy

Tel. +39 059 420411

Fax +39 059 253973

www.datasensing.com

English

CALCULATION OF THE SAFETY DISTANCE

The light curtain must be positioned at a distance exceeding or equal to the minimum safety

distance Sso that a dangerous point can be reached only after stopping the dangerous action of

the machine (Figure 11).

Referring to European standard EN999, the minimum safety distance Smust be calculated

according to the following formula:

S = K (t1+ t2) + C

where:

minimum safety distance

speed of approach of the body to the danger area.

mm/sec

total response time in seconds of the safety light curtain

sec

response time of the machine in seconds, i.e. the time taken by the machine

to interrupt the dangerous action from the moment in which the stop signal is

transmitted

sec

additional distance

Failure to comply with the safety distance reduces or defeats the protective function

of the light curtain.

If the position of the light curtain does not exclude the possibility of the operator

accessing the danger area without being detected, the system must be equipped with

additional mechanical guards.

Figure 11

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