The LGS Series light grids are an example of some of the trends in safety and sensors. These devices have features typically found only on significantly more expensive sensing devices. They feature a slim IP67 enclosure housing with the control unit integrated into the receiver module, uncomplicated plug-and-play mounting plus software-free, and PC-free programming. As a result, these light grinds are easy to install, commission, and operate in warehousing, material handling, packaging and general automation applications.
“LGS series light grids come with a range of noteworthy functions previously found only on much more expensive devices, including lightning speed object detection even with beam crossover enabled, the option of not just detecting objects but identifying them too, and even remotely communicating data via an IO-Link interface,” said Michael Turner, Product Manager, Pepperl+Fuchs. “Even if one or two beams are permanently obstructed due to circumstances in the application, they can be ignored with the beam blanking function. At startup the signal strength is automatically adjusted and optimized for the environmental conditions making switching more reliable and enabling faster response times.”
Examples of relatively simple applications include monitoring an area for falling objects, ejection control and the detection of parts as small as 4 mm. Examples of more advanced applications include overhang detection or web sag and height monitoring. Using the integrated height monitoring function, up to 3 levels of control can be set with the touch field. More complex application examples include object or hole profiling, where objects can not only be detected, but identified using the integrated object identification function. In any of these applications, programming and detection is accomplished quickly and easily without requiring a PC and without using software.
The light grids can be programmed using a capacitive touch field located on the receiver, and no PC software is required. This sensor enables programming and configuration using a modern capacitive touch screen.
Three separate height switching outputs control object height or tension checks and enable the LGS to detect or report three height profiles. Using flexible teach-in options these light grids can identify objects through their geometry, including objects with gaps and openings, when they are moving or in a fixed position.
Commissioning and operation are similar to standard photoelectric sensors – you position the transmitter and receiver opposite each other and signal calibration occurs automatically. Desired features are set without any software, and an innovative touch field with illuminated pictograms facilitates quick and easy step-by-step programming without a PC. Standby mode minimizes energy consumption and maximizes service life in applications where the light grids are not in continuous operation.
LGS light grids are available in customizable lengths from 100 mm to 3,200 mm, a broad range of resolutions from 8 mm up to 100 mm and provide reliable operation in temperatures as low as -30 degrees C. Response time varies from 2 ms to 20 ms depending on the number of beams (4 beams to 253 beams) in the light grid.
Filed Under: Design World articles, Safety systems + components, Sensors (position + other)