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Industrial Ethernet—The basics

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jdub_innov
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re: Industrial Ethernet—The basics
jdub_innov   8/16/2012 3:25:56 PM
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If I understand your proposal correctly, this approach is similar to that being proposed for Audio Visual Bridging. In that scenario, participating nodes register for their required bandwidth. Resulting AVB packets then receive priority when traversing the network. This approach is dependent on several key technologies: 1. A system-wide time base/synchronization mechanism 2. A reservation mechanism 3. A prioritization mechanism 4. A system-wide queuing and forwarding mechanism (this involves traffic-shaping to smooth/distribute high-priority traffic and make optimal use of available bandwidth). Obviously, this technology requires that both the infrastructure and node be aware of these mechanisms, but it doesn’t preclude network participation from nodes that are unaware of the protocol. They simply do not enjoy the level of determinism of participating nodes. Clearly, this technology is applicable to broader markets, including automotive networks, and Industrial Controls.

Mike Fahrion
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re: Industrial Ethernet—The basics
Mike Fahrion   8/9/2012 4:10:11 PM
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Interesting concept! I'm a big advocate of this sort of system and node design thinking. If nodes are aware of network conditions and able to react accordingly then the burden on the network can be reduced dramatically. A holistic approach like this can dramatically lower system cost as it can be quite expensive to build those 5-9's (99.999% uptime) networks, same is true for determinism. Has anyone seen this type of network awareness built into automation systems today?

I_B_GREEN
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re: Industrial Ethernet—The basics
I_B_GREEN   8/6/2012 8:06:37 PM
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Why not a 1/2 deterministic and 1/2 probalistic network topology. Abuse your overusage and get thrown into the probabalistic that again is throttled back to some % say 1/2 of its own total to stay away from the anthing time zero = zero as you~pass the 3/4 full point. Thus when the node is near ful capacity all the nodes are notified that determinisic BW is all used up and throttle back or take your chances on the probabalistic part of the BW. It would allow higher throughput if messages are delayed rather than resend collision, esend collision...in the same stupid way we have done things so far.

Mike Fahrion
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re: Industrial Ethernet—The basics
Mike Fahrion   8/4/2012 3:31:10 PM
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The days of proprietary industrial protocols did a lot of damage. Today, the idea of building any wide scale network with anything proprietary should strike fear into anyone. Off the shelf gigabit and a redundant architecture are more than enough to satisfy most applications. Mixing various network and transport layer protocols adds a degree of cost and difficulty but can typically be managed with a variety of gateways available from many suppliers. For precision timing applications where switched networks won't do the job protocols like EtherCAT provide an effective solution.

docdivakar
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re: Industrial Ethernet—The basics
docdivakar   8/3/2012 9:47:43 PM
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Fairly high level description of industrial Ethernet. I hope there is a more detailed follow up to this article, one that describes how the different types of industrial control area networks can be unified by end users without costly tear downs or replacements. I would also like to see discussion on how long the fragmented industrial Ethernet can survive... MP Divakar

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