Back to Basics: Introduction to Industrial Barcode Reading 1
Agenda What is a barcode? History 1 D codes Types and terminology 2 D codes Types and terminology Marking Methods Laser Scanning Image Based Reading Hardware and Software Communication How to select a reader 2 2 2014 Cognex Corporation
What is barcode reading? A barcode is a machine readable representation of data related to the object it is attached to. A barcode reader is used to read these codes in order to track the object throughout its lifecycle. 3 3 2014 Cognex Corporation
Where are barcodes used? The first product to ever be scanned was in 1974. By the 1980s, scanning for retail became worldwide. Today, codes can be both 1 D and 2 D. Where can I find barcodes? 4 4 2014 Cognex Corporation
Where are barcodes used? Food Packaging Medical & Pharmaceutical Electronics 5 Automotive Aerospace 5 2014 Cognex Corporation
1 D Barcodes Different types Industry terminology Common uses 6 6 2014 Cognex Corporation
Common 1 D Barcode Types UPC A Code 39 Code 128 Interleaved 2 of 5 7 Codabar Pharmacode 7 2014 Cognex Corporation
Linear Barcode Terminology Quiet Zone Guard Pattern Narrow Bar Width 8 8 2014 Cognex Corporation
2 D Barcodes Different types Industry terminology Marking methods Common uses 9 9 2014 Cognex Corporation
Common 2 D Codes DataMatrix QR Code MaxiCode Aztec Code 10 10 2014 Cognex Corporation
2 D Code Terminology 24 square and 6 rectangular formats 3,116 numeric or 2,335 alphanumeric characters Cell presence/absence check tolerates poor printing Error correction improves read rates Scalable Reading accuracy 1 misread error in 10.5 million scans Requires an image-based ID reader to decode 11 11 2014 Cognex Corporation
Printing Methods: Printed Codes 1 D and 2 D Printed Codes Inkjet Labels Most basic Cost effective Less flexible, pre determined code data 12 12 2014 Cognex Corporation
Marking Methods: DPM 2 D Direct Part Marking (DPM) Dot Peen Chemically Etched Laser Marked 13 13 2014 Cognex Corporation
Laser Scanner Technology What is it? How does it work? Benefits Limitations 14 14 2014 Cognex Corporation
Laser Scanning Technology Barcode Light Detector Signal Digitized Signal 15 15 2014 Cognex Corporation
Benefits of Laser Scanners Cost No image processor Uses oscillating mirrors Speed Fast scan rates, some up to 1300 scan/sec Decoding at long distances 6 to 24 inches away Long range can do multiple feet away Most common and longest in use 16 16 2014 Cognex Corporation
Limitations of Laser Scanners Hard to scan barcodes Poorly printed Defective / damaged Low contrast Specular reflections Narrow heighted Unidirectional scanning No omnidirectional (360 ) or at least orthogonal (0 and 90 ) reading Mounting and positioning constraints Moving parts are subject to failure Cannot read 2 D codes 17 17 2014 Cognex Corporation
Image Based Barcode Reader Technology What is it? How does it work? Pixels per module Image formation Benefits Limitations 18 18 2014 Cognex Corporation
Imager Based Barcode Reader Technology 19 19 2014 Cognex Corporation
What is the measurement PPM? (Pixels per Module) How many pixels on the sensor for each module, at a focal distance. Definition: One Module Example: Sensor 752 Pixels 480 Pixels Working Distance Lens 78 mm 12x12 Code 5mm x 5mm 50 mm 20 20 2014 Cognex Corporation
Image Based Barcode Reader Simple Set Up: Hardware Code size Mounting/reading distance Lens options Liquid lens technology C Mount, S Mount lens Lighting Stable 21 21 2014 Cognex Corporation
Image Based Barcode Readers: Liquid Lens Technology 22 22 2014 Cognex Corporation
Image Based Barcode Readers: Image Formation Lighting Dark ink, light background simple direct illumination DPM require more advanced lighting techniques Reader should have ideal focus settings Lens advisor: S Mount, C Mount, Liquid lens Bright Field Lighting: High contrast labels & DPM parts Dark Field Lighting: Dot Peen & laser DPM Diffuse Dome: Highly reflective & curved surface DPM reading 23 23 2014 Cognex Corporation
Image Based Barcode Reader Simple Set Up: Software 24 24 2014 Cognex Corporation
Benefits of Image Based Barcode Reader Technology No Moving Parts Solid state device Longer life than laser scanners High Read Rates Can read damaged/ properly marked codes Omnidirectional reading Image Feedback Store No Read images Find out why a code does not read 25 25 2014 Cognex Corporation
Limitations of Image Based Technology Cost In the past, imager processors were very expensive Speed Older readers can be slow due to less advanced processors Can be difficult to setup Software needed for some system Good image for processing 26 26 2014 Cognex Corporation
Communication Protocols Ethernet TCP/IP RS 232 USB Keyboard Mode Discrete I/O FTP 27 27 2014 Cognex Corporation
Integrating your Barcode Reader PLC Integration Ethernet/IP : Allen Bradley Add On Profile PROFINET : Siemens MC Protocol: Mitsubishi Modbus TCP : Schneider Electric Storing Data to a Database Oracle SAP: Enterprise Resource Planning (ERP) Discrete I/O 28 28 2014 Cognex Corporation
What should you consider when selecting a Barcode Reader? Read rates Best algorithms to decode 1 D and 2 D codes Reduce No Reads and misreads Durability/Life of reader Solid state device, no moving parts Ease of setup User friendly software Communication Need a reader that supports your facilities protocol 99.9% VS. 29 29 2014 Cognex Corporation
Read Rates Best in class algorithms Ability to read some of the hardest codes Codes on cardboard Codes marked with a marker Poor factory lighting 30 30 2014 Cognex Corporation
Read Rates Best in class algorithms DPM Codes Shiny material Poor quality codes Small Low contrast codes 31 31 2014 Cognex Corporation
Cognex Readers Durability/ Life of Reader Solid state readers, no moving parts Ease of Setup Easy tuning in software and hardware Liquid Lens technology Communication Supports popular industrial protocols and communication protocols Cognex Products Full line of handheld and fixed mount readers Different price & performance options 32 32 2014 Cognex Corporation
QUESTIONS? 33 33 2014 Cognex Corporation
Thank You Contact Cognex Sales: 844 GET CGNX (844 438 2469) 34 34 2014 Cognex Corporation