Rockwell Automation has embedded Ethernet device level ring (DLR) technology into its Integrated Architecture system for high-speed, high-performance applications needing resilient networks, and for machine builders looking for flexible控制工程网版权所有, reliableCONTROL ENGINEERING China版权所有, low-cost network solutions for their real-time EtherNet/IP applications. Throughout 2009, Allen-Bradley ControlLogix controllersCONTROL ENGINEERING China版权所有, I/O systems and Allen-Bradley Kinetix motion solutions with DLR technology will be made available. Rockwell Automation will also release a stand-alone communication module to help manufacturers connect devices not equipped with DLR technology to the ring.
        DLR is a network technology for industrial applications that takes advantage of embedded switch functionality in automation end deviceswww.cechina.cn, such as I/O modules and programmable automation controllersCONTROL ENGINEERING China版权所有, to enable Ethernet ring network topologies at the device level. Unlike a network- or switch-level ring topology that provides resilience to the network infrastructure控制工程网版权所有, DLR technology adds device-level network resilience to optimize machine operation. When a DLR detects a break in the ring, it provides alternate routing of the data to help recover the network at extremely fast rates. Enhanced diagnostics built into DLR-enabled products identify the point of failure, helping to speed maintenance and reduce mean time to repair.
        "Functional tests show that the typical recovery time for a 50-node device level ring is less than three milliseconds," said Mike Hannah, manager, Networks Business, Rockwell Automation. "With this fast recovery, most failures become invisible to devices on the network, and machines often continue operating without interruptions. Keeping production running on the plant floor helps increase machine uptime and productivity—important KPIs for today's manufacturers."
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