Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario descargar pdf (Pagina 52)

52 Rockwell Automation Publication ENET-RM002C-EN-P - May 2013

Chapter 3 Ethernet Infrastructure Features

Segments can be wrapped into a ring. Identification of edge ports requires

additional configuration.

Device-level Ring (DLR)

The DLR protocol is a layer 2 protocol that provides link-level, physical

redundancy that provides network convergence in the 1…3 ms range for simple

automation device networks. The other resiliency protocols apply to only

infrastructure (switches and routers). DLR provides resiliency directly to an end

device directly (such as an I/O module, drive, or controller).

Some control applications, such as safety and motion require network

convergence times faster than what switch-oriented resiliency protocols can

provide. Most control applications suffer connection timeouts with switch-

oriented resiliency protocols.

Blocking

Forwarding

Link Failure

Blocking

Forwarding

Link Failure

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Rockwell-automation Ethernet Design Considerations Reference Manual Manual de usuario Pagina 52