LEF-4800 LIGHT CURTAIN SERIES:
Resolutions of .55 in, .79in, .1.18 in and 1.57 in.
Range:  23 to 65 feet (depending on resolution)
Segment protected heights from 9 in to 83 in (depending on resolution)
Fast response time
Scan Code for Cross-Talk Mitigation
EDM External Device Monitoring (MPCE Monitoring)
Safety Outputs.
Operating Modes
Machine Test Signal
Auxiliary Output (PNP Follow Only)
Muting Through RM-6 Resource Module
Blanking
Range Selection
Individual Beam Indicators
Adjustable Mounitng Brackets and T-Slot
Non-Shielded Main Cables.

DeviceNet Interface.
Muting through RM-6

Resolutions of .55 in, .79in, .1.18 in and 1.57 in.

• Resolution determines the depth of penetration, which is very critical when locating the distance a light curtain must be located from the "Point of Operation".  It is possible to mix segments with different resolutions within an LEF4800 System.  All resolutions are not available in all protected heights.  Call CIECO engineering for detailed information.

Range:  23 to 65 feet (depending on resolution)

• 23 ft for .56" resolution systems
  65 ft for .79", 1.18" and 1.57" resolution systems

Segment protected heights from 9 in to 83 in (depending on resolution)

• The LEF4800 is offered in protectiive heights ranging from 9.5" to 70.9" for .55"/.79" resolutions, from 9.5" to 83.5" for 1.2" resolution and from 14.2" to 80.3" for 1.58" resolution.

Fast response time

• From 14 ms to 59 ms depending on beam count

Scan Code for Cross-Talk Mitigation

• The LEF4800 receiver and transmitter offer scan code selection to minimize cross-talk.

EDM External Device Monitoring (MPCE Monitoring)

• EDM is an important safety function. It monitors the LEF4800 system interface to the guarded machine, checks to ensure that the control elements are responding correctly to the light curtain and detects any inconsistency between the two external control devices. This is necessary to detect a manfunction within the interface which prevents a stop signal from reaching the machine controller.

Safety Outputs.

• Two PNP, each output sourcing 625 mA @ 24VDC, short circuit protection

Operating Modes

• Automatic Start
  The LEF4800 will power-up with its safety and auxiliary outputs OFF, and, if the detection zone is not obstructed, enters the MACHINE RUN state.
  Start/Restart Interlock
  The LEF4800 will power up with its safety outputs off and enter the INTERLOCK state if the detection zone is clear (or the Fixed or Monitoring Blanking pattern is satisfied, if enabled) and no alarms are detected. To initially enter the MACHINE RUN state the operator must press and release the Start button. Once in the MACHINE RUN state, when an object is sensed entering the detection zone, the system will change to the MACHINE STOP state. When the detection zone is cleared, the system will not automatically change to MACHINE RUN but enter the INTERLOCK state instead. The operator must always press and release the Start button to enter MACHINE RUN. If the detection zone is not clear the Start button will have no effect.

Machine Test Signal

• Some applications require that the machine guarding system be tested by the machine controller during a non-hazardous portion of the machine cycle to verifty that the guarding systeem is functioning properly. The MTS option on the trasmitter provides this capability.

Auxiliary Output (PNP Follow Only)

• In the on state, this PNP output will source up to 100 mA at 24 VDC. In this configuration the auxiliary outputs will be on when the safety outputs are on.

Muting Through RM-6 Resource Module

• The LEF4800 series provide the muting function through the use of an RM-6 resource module. The RM-6 serves as a termination point for the muting sensors and muting lamp. Use of a muting function requires special precautions by the safety system machine controller, installer, operator and employer.

Blanking

• FIXED BLANKING
  Fixed Blanking allows a system to blank optical beams and record the exact pattern.  A system can record and store a single pattern.  The protected zone's object detection is then based on the stored pattern.  All obstructed optical beams recorded during the selection must remain blocked and all clear beams recorded duing the selection must remain clear for the system to enter or remain in the MACHINE RUN state.
  FLOATING BLANK
  One channel can be obstructed at any location in the detection zone as long as synchronization is maintained.  This means that an object can freely float from one end of the protectiove field to the other without the LEF4800 system entering the MACHINE STOP state.  The obstructed channels are not fixed at a single location but "float" through the detection zone.

Range Selection

• The LEF4800 offers operating range selection:  short range is 8m and long range is 20m.  This function is useful when there are many light curtains operating within a small space and the  posssibility of cross-talk is likely.

Individual Beam Indicators

• The LEF4800 systems have a visible, red, Individual Beam Indicator (IBI) adjacent to each infrared beam. These IBI's are located on the receiver. The IBI will light when the infrared beam fails to meet the conditions necessary for the system to remain in the MACHINE RUN state.