A Perspective on Ethernet TCP/IP as a Fieldbus Outline - CERN
A Perspective on Ethernet TCP/IP as a Fieldbus Outline - CERN
A Perspective on Ethernet TCP/IP as a Fieldbus Outline - CERN
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Bounded Latency‰ CSMA/CD with random backoff9 many nodes, l<strong>on</strong>g packets ⇒ 100% use9 small packet ⇒ 37% worst c<strong>as</strong>e use9 no guarantee9 capture effect‰ <strong>TCP</strong>‰ CPU + OS performance<strong>CERN</strong> <strong>Ethernet</strong> <strong>as</strong> a <strong>Fieldbus</strong> 11© J.-D. Decotignie, 2001Efficiency‰ to transmit 16 bits9 PROFIBUS FMS ~451 bits + 2 switch times (max. large)9 F<strong>IP</strong> ~ 122 bits + 1 switch time (max 90 bits)9 CAN ~200 bits (request and resp<strong>on</strong>se)9 ethernet ~1000 bits (request and resp<strong>on</strong>se)<strong>CERN</strong> <strong>Ethernet</strong> <strong>as</strong> a <strong>Fieldbus</strong> 12© J.-D. Decotignie, 2001
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