Standards
@imveurope
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Both interfaces will exist side by side for quite some time because they serve different needs – GigE: cable length, network; USB 3.0: bandwidth, plug-and-play.’ USB3 Vision excels in terms of the
The USB3 Vision committee has a number of different projects underway
combination of bandwidth, CPU overhead, ease-of-use and cost, said Gross. GigE Vision is a good choice for applications that need to run over 100 metres of cabling, USB3 Vision is generally better for applications that only require shorter distances. Additionally, USB3 Vision is opening up
new markets in the embedded systems space, according to Gross. ‘GigE Vision has always been a tough fit for these [embedded] types of applications because most traditional embedded-class systems had limited gigabit Ethernet capabilities, as well as the processing power needed to de-packetise the data. USB, on the other hand, is very prevalent in nearly every embedded system and offers greatly reduced overhead compared to Ethernet processing, which makes it ideal for processors in this space.’ Te camera manufacturer, IDS, will be producing USB3 Vision and GenICam
compliant cameras in its ML, LE, and CP Gen 2 product families, starting in November 2014. In the past the company hasn’t certified its products with GigE Vision, for instance, as Tom Hospod, sales director for IDS North America, explained: ‘In the past, standards such as GigE Vision restricted or limited IDS’ ability to introduce advanced camera functions and support features into its soſtware suite, such as multi-exposure mode, hot pixel correction, HDR log mode, variable pixel clock optimiser, etc. It was just a matter of priorities and time before IDS would support and certify its products for use with such vision standards as USB3Vision.’ Hospod said that there is ‘more emphasis
being placed on ease-of-use and plug-and- play’ in machine vision. IDS’ USB3 Vision cameras will offer both the advantages of USB3 Vision, such as standard naming conventions, common transport layers, plug-and-play, and vendor independence, and the advanced camera functions and features from IDS’ soſtware development kit. Te USB3 Vision committee has a number of different projects underway, including
Integrator standard
The Association of German Engineers, the VDI, in cooperation with the machine vision chapter of the VDMA, are developing a standard specification sheet for making a ‘factory acceptance test’, planned for release in 2015. VDI/VDE 2632 Part 3,
for specifying a factory acceptance test to determine the functionality of machine vision in production equipment, is the third part of standard information sheets designed to aid end-users and machine vision suppliers when integrating vision in production machinery. VDI/ VDE 2632 Part 1, ‘Machine vision: Basics, terms and definitions’, was released in April 2010, while Part 2 of the standard, ‘Machine vision: Guidelines for the preparation of a requirement specification and a system
specification’, came out in September 2013. While there are many standards for machine vision components, such as the interface standards, there is very little in the way of standard documents for suppliers of complex systems. These VDI specification sheets define what needs to be known by both sides – the end user and the vision supplier – to integrate machine vision successfully into production equipment.
‘The target group is the end user of machine vision in various industries, as well as machine builders that are thinking about integrating vision in their machines,’ explained Markus Maurer at Vitronic, who is active in the standard working group. The specifications give the end customer an idea of the types of questions they
30 Imaging and Machine Vision Europe • Yearbook 2014/2015
should be asking in order to install an effective machine vision system.
He added that the VDI standard is also designed for suppliers of machine vision components, so that they can quote for or design an inspection system. ‘The specification is so that both sides understand the other side a little bit better,’ Maurer said.
The end customer should be aware of factors like vision cycle time and inspection rate, while machine vision companies need to have an idea of the types of defect the vision system will have to pick up, as well as the environmental conditions it will have to work under – does the system require shielding from external light, for example?
VDI/VDE 2632 Part 3, which the group is currently
working on, will define what is needed for an effective factory acceptance test, such as how many parts should be checked, the type of part, and the criteria to decide which defects are relevant, among other issues. ‘If you use the same sample parts for the acceptance test as were used for the setup of the system, then of course you’ll pass the test. But maybe actual production is a little bit different,’ noted Maurer, adding that real components from the production line should be used in acceptance tests.
‘There is sometimes a lack of communication and sometimes a lack of understanding of what each side wants,’ Maurer continued. ‘As a machine vision company, you are dealing with many different end customers from
different sectors, and it’s not always easy to understand their requirements. The end customer might have many different production techniques, with machine vision only being a small portion of overall equipment. The end user might also not be aware of what influences the optical system and the inspection results, and what is important to achieve high throughput and reliable inspection. This is what we are trying to define.’ VDI/VDE 2632 parts 1 and 2 are currently available at Beuth (
http://www.beuth. de/en), with Part 3 expected to be published next year. The VDMA Machine Vision group has also produced a video that explains the benefits of Part 2 of the standard.
www.vdi.eu/mv2632,
www.vdma.org/flawless
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