1D and 2D code readers
12 August 2014
The OPC120 series code readers, from Pepperl+Fuchs, offer a range of stationary readers for detecting and decoding 1D and 2D codes, such as barcodes and Data Matrix codes.
The unit housing is 70mm wide, 70mm high, and54 mm deep, which contains a CMOS imager, an LED flash, and a control interface. It is able to read the majority of code symbologies currently in use and is available in two versions – The OPC120W for use in many standard tasks that have normal reading speed requirements; and the high-end OPC120P which can reach reading speeds of up to 100 readings/sec or tape speeds of up to 10m/sec.
A weakness of many optical sensors is the fact that they are affected by unfavourable reflections caused by external light or the cameras own light. Under normal circumstances, it is difficult to completely prevent reflections as they are dependent on multiple factors, including the reading angle of the code reader, the angle of the light source, and the orientation and structure of the surface on which the code to be detected is located. Codes on rounded, curved, or cylindrical objects made from reflective materials are particularly difficult to assess, as various reading angles can occur during a single reading.
Pepperl+Fuchs has equipped the OPC120P with polarisation filter technology that is said to prevent faulty readings in such scenarios. It eliminates harmful reflections and enables more reliable readings to be taken, even if codes are located on highly reflective surfaces.
As well as detecting 1D and 2D codes, the code readers are able to check for the presence of variable textures and static graphics. The presence detection function ensures that variable structures – such as use-by dates and dates of manufacture — really are located at a pre-defined point. Logo detection allows non-variable features, such as company logos, to be detected and checked.
It is often the case that multiple codes need to be read in one application. The OPC120 allows up to four codes to be read in a single image capture. The device cannot only read codes but also process up to four tasks, such as presence and logo detection, in a single image capture.
The OPC120 is available with all major interface variants, allowing it to be integrated into systems and machinery. These interfaces include RS232, digital inputs/outputs, a connectivity option for a rotary encoder or trigger sensor, Ethernet TCP/IP, and PROFINET.
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