Beacon Based DLR (Device Level Ring)
Device Level Ring (DLR) is a network technology for industrial applications that uses embedded switch functionality in automation end devices, such as programmable automation controllers and I/O modules, to enable Ethernet ring network topologies at the device level. DLR technology adds network resilience to optimize machine operation. Beacon based DLR networks consist of a ring supervisor and a number of ring nodes, and use “beacons” to detect breaks in the ring. When a DLR network detects a break in the ring, it provides ways to alternatively route the data to recover the network. Diagnostics built into DLR products can identify the point of failure, thus helping to speed maintenance and reduce repair time. The Anybus CompactCom 40 EtherNet/IP IIoT Secure implements the DLR protocol, and it is enabled by default. The device is able to process and act on beacon frames sent by ring supervisors, and supports beacon rates down to 100 μs. If needed, the DLR functionality can be disabled. This can be done by setting attribute #31 (Enable DLR) in the EtherNet/IP Host Object to False. See EtherNet/IP Host Object (F8h).