1. JANUS
TYPE 4
SAFETY LIGHT CURTAINS
applications

2. JANUS Muting Light Curtains
Janus J
Perimeter guarding, long range 60m with 40mm resolution, Passive retro reflective
Janus MI
Standard Muting with external sensors
Janus ML
With Built in muting sensors for one way mode, entry or exit
Janus MT
With Built in muting sensors for two way mode, entry and exit
Janus TRX
All the above features with passive retro reflective element

3. JANUS MT 2 crossed muting beams
Mechanical guards S1 S2
DANGEROUS
AREA
MUTING
Mechanical guards ON
OFF
The size of the pallet is regular
The muting sequence is correct
The pallet can pass through the safety light grid
OSSD

4. STOP JANUS MT 2 crossed muting beams DANGEROUS AREA Mechanical guardsON
OFF
The width of the pallet is much less than the conveyor width
The pallet is not centered on the conveyor
The muting sequence is wrong (the system is not in position to
distinguish the material from the operator)
The safety light grid sends an emergency stop command to the
machine
OSSD

5. STOP JANUS MT 2 crossed muting beams DANGEROUS AREA Mechanical guardsON
OFF
The width of the pallet is much less than the conveyor width
The pallet is not centered on the conveyor
The muting sequence is wrong (the system is not in position to
distinguish the material from the operator)
The safety light grid sends an emergency stop command to the
machine
OSSD

6. STOP JANUS MT 2 crossed muting beams DANGEROUS AREA Mechanical guards
The muting function can be activated only if two muting sensors are activated at the same time t2(s2) – t1(S1) = max. 4 seconds
An opaque cylindrical object D ≤ 500 mm (= a person) must not be able to initiate the muting function (IEC TS 62046).
The cylindrical test object is detected by the light curtain before it activates the muting sensors.
The cylindrical test object activates a muting sensor and interrupts a beam of the light curtain before activating the second muting sensor. The muting function is not activated and the safety outputs of the light curtain are brought to the off-state. ON
OFF
OSSD

7. STOP JANUS MT 2 crossed muting beams DANGEROUS AREA Mechanical guards
The muting function can be activated only if two muting sensors are activated at the same time t2(s2) – t1(S1) = max. 4 seconds
An opaque cylindrical object D ≤ 500 mm (= a person) must not be able to initiate the muting function (IEC TS 62046).
The cylindrical test object is detected by the light curtain before it activates the muting sensors.
The cylindrical test object activates a muting sensor and interrupts a beam of the light curtain before activating the second muting sensor. The muting function is not activated and the safety outputs of the light curtain are brought to the off-state. ON
OFF
OSSD

8. JANUS MT_S4 4 parallel muting beams
Mechanical guards S1 S2 S3 S4
DANGEROUS
AREA
MUTING
Mechanical guards ON
OFF
The width of the pallet is much less than the conveyor width
The pallet is not centered on the conveyor
The muting sequence is correct
The pallet can pass through the safety light grid
OSSD

9. STOP JANUS MT_S4 4 parallel muting beams DANGEROUS AREA
Mechanical guards S1 S2 S3 S4
STOP
DANGEROUS
AREA
MUTING
Mechanical guards ON
OFF
The length of the pallet is less than the distance between S1-S4
The muting sequence is wrong (the system is not in position to
distinguish the material from the operator)
The safety light grid sends an emergency stop command to the
machine
OSSD
ReeR SpA JANUS 07/2005

10. STOP JANUS MT_S4 4 parallel muting beams DANGEROUS AREA
Mechanical Guards S1 S2 S3 S4
STOP
DANGEROUS
AREA
MUTING
Mechanical Guards ON
OFF
OSSD
For a short period, the 4 beams must all be interrupted (transfer of the muting function from s1-s2 to s3-s4).
An opaque cylindrical object D ≤ 500 mm (= a person) must not activate the muting function (IEC TS 62046).
The muting function is not activated and the safety outputs of the light curtain are brought to the off-state.

11. STOP JANUS MT 2 crossed muting beams DANGEROUS AREA Mechanical guardsON
OFF
On the pallet there are transparent objects: empty glass bottles
without labels
Due to the inclination of the muting beams only 1 or 2 bottles
intercept the beams first
The muting beams could pass through the glass and the detection
is difficult and unstable
The muting sequence is wrong
The safety light grid sends an emergency stop command to the
machine
OSSD
ReeR SpA JANUS 09/2005

12. JANUS MT_S4 4 parallel muting beams
Mechanical guards S1 S2 S3 S4
DANGEROUS
AREA
MUTING
Mechanical guards ON
OFF
The muting sensors of Janus MT_S4 are specially designed for
transparent objects
With parallel muting beams a row of bottles intercepts the beams
and the detection is easier and stable
The muting sequence is correct
The pallet can pass through the safety light grid
OSSD
ReeR SpA JANUS 07/2005

13. JANUS ML 2 crossed muting beams
Mechanical guards S1 S2
DANGEROUS
AREA
MUTING
Mechanical guards ON
OFF
The size of the pallet is regular
The muting sequence is correct
The pallet can pass through the safety light grid
OSSD
ReeR SpA JANUS 09/2005

14. JANUS ML 2 crossed muting beams
Mechanical guards S1 S2
DANGEROUS
AREA
MUTING
Mechanical guards ON
OFF
The width of the pallet is much less than the conveyor width
The pallet is not centered on the conveyor
The muting sequence is correct
The pallet can pass through the safety light grid
OSSD
ReeR SpA JANUS 09/2005

15. STOP JANUS ML_S2 2 parallel muting beams DANGEROUS AREA
Mechanical guards S1 S2
DANGEROUS
AREA
STOP
MUTING
Mechanical guards ON
OFF
On the pallet there are transparent objects: empty glass bottles
without labels
Due to the inclination of the muting beams only 1 or 2 bottles
intercept the beams first
The muting beams could pass through the glass and the detection
is difficult and unstable
The muting sequence is wrong
The safety light grid sends an emergency stop command to the
machine
OSSD
ReeR SpA JANUS 09/2005

16. JANUS ML_S2 2 parallel muting beams
Mechanical guards S1 S2
DANGEROUS
AREA
MUTING
Mechanical guards ON
OFF
The muting sensors of Janus ML_S2 are specially designed for
transparent objects
With parallel muting beams a row of bottles intercepts the beams
and the detection is easier and stable
The muting sequence is correct
The pallet can pass through the safety light grid
OSSD
ReeR SpA JANUS 09/2005

17. Muting function for palletizer protection
IEC TS 62046
application and integration of safety electrosensitive devices for body detection
Muting function for palletizer protection

18. 2 muting sensors – crossed beams with concurrent checking
The crossing point of the two light beams S1 and S2 shall be located behind the
sensing field of the ESPE in direction of the hazardous zone.
t2(s2) – t1(S1) = 4 sec. max
IEC TS 62046

19. 2 muting sensors – crossed beams with concurrent checking
Due to an incorrect positioning muting beams S1 and S2 the pallet keeps the
safety light grid in Muting condition for a long time.
If larger than 200 mm it could create a space sufficient to enter in the
dangerous area
IEC TS 62046

20. 2 muting sensors – crossed beams with concurrent checking
An object with a diameter of 500 mm must not be able to start the muting function.
That gives assurance of a correct distinction between the material and a person.
IEC TS 62046

21. 2 muting sensors – crossed beams with concurrent checking
The crossing point of the two sensor beams should be positioned at the same level
as, or higher than, the lowest beam of the safety barrier in order to avoid easy
manipulation of the system and unintentional activation of the muting function.
IEC TS 62046

22. 4 muting sensor with parallel muting beams with entry / exit pallet sequence timing control ( “T” sensor position)
The muting sensors shall be installed so close to the safety barrier so that it is
difficult to enter the danger zone without being detected by preceding or following
immediately the pallet or the transport system (d1 e d3 < 200 mm).
The distance between any 2 muting sensors shall be sufficient so that they cannot be
actuated simultaneously by a persons leg (d2 > 250 mm).
All the 4 sensors must to be simultaneously intercepted for at least a small period of
time.
IEC TS 62046

23. 4 muting sensors with parallel muting beams with entry / exit pallet sequence timing control ( “T” sensor position)
An opaque cylindrical object with a diameter of 500 must not be able to activate the muting function.
IEC TS 62046

24. JANUS
SAFETY DISTANCE

25. Safety and Responsibility
JANUS ML / MT
THE REASONS FOR SUCCESS
Safety and Responsibility
Thanks to:
Built-in Muting Photocells with crossed or parallel beams always correctly positioned and in compliance
Safety requirements (IEC TS 62046) met in order to recognize the material and distinguish between an object and a person.
Built-in Muting Photocells protect against the end-user
manipulating the position of the beams which could lead to a dangerous condition.
Reduces risk for the Machine Manufacturer and the End User and meets safety requirements.

26. THE REASONS FOR SUCCESS
JANUS ML / MT
THE REASONS FOR SUCCESS
Safety and Responsibility
With the ML / ML TRX and MT / MT TRX models, compliance with the safety requirements -IEC TS regarding the geometry of the muting sensors and all the other safety parameters is automatically guaranteed with built in sensors.

27. Janus M Series Light Barrier, Safety Innovation For Material Handling
                                        
The Janus M series range of light barriers for Palletizing, ,Machine Conveying, wrapping, loading, robotic applications etc... Where muting is integral to the flow of material.
Features:
Two safe static outputs can work without external control units having all the safety functions integrated inside the Emitter and the Receiver.  This complies harmoniously with the requirements of the Standard EN , the International Standard IEC and CSA Z Safeguarding of Machinery. 
Extremely easy connection and installation, thanks to the M12 5-pole (emitter) and M23 19-pole (receiver) standard connectors. 
Use of standard cables up to 100 m long.  No need for shielded cables. 
Settings of each function are integrally performed via the connector.  Patented solutions allow the installer to perform a wide range of user friendly configurable functions with only a few connector pins. No need for software or dip-switch settings on the light curtain for the configuration!  The end user can replace a product without the possibility of errors or the necessity of a skilled operator! 
Integration of the main safety functions, including self-monitoring of the safety circuits and, the external device monitoring (EDM) and the Start / Restart interlock functions. 
Integration of the Muting function and of the Muting sensors (ML and MT models).  All Muting parameters settings (Muting timeout, override, etc.), via the receiver connector and/or the MJB connection boxes.
Please visit our Virtual Exhibit at further information.

28. Norstat has been a Master North American Distributor representing superior quality European industrial automation and safety related products for over 47 years. We offer excellent safety and automation application assistance to the manufacturing and machinery industry.
You can find our complete program of products at  
Safety Switches
Safety Light Barriers 
Safety Relays
DIN & M Series Connectors
Automation Products
Safety Consultation