CABLING
time you don’t have to schedule anything,’ he said, adding that the latencies of the cable now become important. Version two of CLHS, which is under development at the moment, will be able to synchronise multiple cameras with various cable lengths to nanosecond precision. CLHS also has the ability to split the data across multiple processing units, because cameras can create so much data that the PCs can’t keep up. Tis is important in web inspection and other high bandwidth applications.
Cabling considerations When installing a machine vision system, the cabling is just as an important factor as the camera, lens and lighting. ‘What needs to be considered is the length of cable that is needed and the cost associated with the technology required to achieve longer distances,’ commented Folkeringa at Intercon 1. Another consideration noted by Ray
Berst, president of Components Express, which supplies machine vision cabling, is
the environment the cables will be subjected to – whether the cable will have to move or be static, or whether there are concerns about electromagnetic interference, for example. Components Express has recently released a 25 metre USB3 Vision copper cable solution, which extends the relatively short reach of USB3 Vision cabling. ‘Equally important is to
There are now SFP+ single lane solutions that rival the cost of copper at 10 metres. You’ll see those prices come down
determine the appropriate cable for those applications that are high flex,’ Folkeringa commented. Tere are many types of flex motions and not all high-flex cables are suitable for a particular type of motion. A torsional
motion, for instance, is different to a rolling flex or tick-tock motion. ‘It is important that your cable supplier understands the type of application so that they can offer the best solution that will withstand those types of forces over millions of flexes,’ he said. In terms of technology advances, Folkeringa
noted that now cable assemblies are available with integrated signal conditioning, which
could include signal, pre-emphasis and equalisation. He added that there is more demand for robotic cable assemblies that incorporate multiple devices and motor connections within the same cable. In terms of Camera Link HS, Miethig noted
that the upgrades planned for version two include adding multiple buffers whereby each buffer in the frame grabber can have a different pixel type and bit depth. A 3D camera can therefore send 3D data to one buffer and the raw image to a second buffer, for example. Te speed will also increase on both M- and X-protocols and the new version will add more robust frame header and frame trailer packets. In the wider machine vision cabling
market, Berst predicted that many standards like USB3.1 and Tunderbolt will require active cables as a standard, while Folkeringa commented that he expects to see new methods for achieving longer distances, as well as wireless applications being developed. ‘Bandwidth and data rate is currently a major limiting factoring in utilising wireless technologies,’ he said. ‘I think we may see some novel solutions that overcome these barriers in the next 10 years.’ O
GENERATION
USB 3.1 Type C receptacles are now available. Type C assemblies will be released shortly.
Discover the USB 3.1 Product Family:
www.alysium.com
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