Safety Positioning System

Monday, November 5, 2018 @ 04:11 PM gHale

Pepperl+Fuchs’ safePXV and safePGV SIL 3/PL e absolute positioning systems.

Pepperl+Fuchs has a new generation of positioning systems that achieve SIL 3/PLe compliance with a single sensor.

While previously associated with high cost and time investment, this safety level can now be attained more simply.

The safePGV and safePXV systems from Pepperl+Fuchs achieve maximum safety in the form of a single-sensor positioning system. This new generation of security solutions is based on a technology used for years, the combination of a 2-D reader and Data Matrix code.

New superimposed Data Matrix codes, one in red and one in blue, are the hallmark of the safety version. The 2-D reader is also equipped with red and blue LEDs. The two-color Data Matrix codes, in combination with two-color LEDs on the reader, are the basis for this unique security solution. Each individual code contains position and safety information, which is made visible by red or blue LED illumination and can therefore be read by the camera.

The safePXV positioning system offers reliability for linear absolute positioning. Due to its easy handling, the system is suitable for a variety of applications, such as ensuring exact positioning of monorail conveyors in a production line. Additionally, it can be used for stacker cranes in material handling, rotary tables, elevators, and skillets.

The new safePGV system works for navigation with automated guided vehicles (AGV) in the fields of warehousing and material handling, supply, and production. In addition to the safe X position, the sensor supplies all values required for reliable vehicle control. In automotive manufacturing, for example, a minimum distance can be guaranteed between vehicles at all times, protecting all the employees working in that area. In addition to the safe data, the plant operator can also access angular feedback and Y positions in order to correct track deviations easily at any time.

A new firmware is the mastermind behind these positioning systems. It controls the different LED colors with a safe-rated algorithm. Each code is then directly checked for plausibility in the safety section of the sensor. The 2-D read head of the new absolute positioning systems reads the color codes of the Data Matrix code band. The advanced firmware processes the received information based on a safe algorithm in the sensor and forwards it as safe data according to SIL 3/PLe to the safety PLC.

This progressive sensor technology performs continuous self-checks. Most importantly, however, this system meets the high SIL 3/PLe safety requirements with a single sensor.

The sensor’s scan window has been considerably enlarged, now measuring 120 mm x 80 mm, and provides multiple levels of redundancy.



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