Rockwell-automation Ethernet Design Considerations Reference Manual Instrukcja Użytkownika Pobierz pdf (Strona 23)

Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 23

Ethernet Infrastructure Components Chapter 2

The EtherNet/IP embedded switch technology offers alternative network

topologies by embedding switches into the end devices themselves.

Table 5 - Topologies with Embedded Switch Technology

Topology Description

Device-level ring (DLR)—embedded switch A DLR network is a single-fault tolerant ring network intended for the interconnection of automation devices. This

topology is also implemented at the device level. No additional switches are required.

Advantages

• Ability to survive a single point of failure or a device

being powered down on the ring.

• Simplified cabling

• Ability to cover long distances with 100 m between

each copper segment

• Very fast network convergence

Disadvantages

• Supervisor-node configuration required

• Additional configuration complexity

• Variable number of hops can make performance

difficult to predict

Linear—embedded switch A linear network is a collection of devices that are daisy-chained together. The EtherNet/IP embedded switch technology

enables this topology to be implemented at the device level. No additional switches are required.

A linear topology works best for a limited number of nodes.

Advantages

• Easy to design, configure, and implement

• Least amount of cabling

• Minimal amount of cable needed

• Ability to cover long distances with 100 m between

each link

Disadvantages

• Loss of network service in case of connection failure (no

resiliency)

• Creates the potential for bottlenecks

• Variable number of hops can make performance

difficult to predict

• Powering down a device or the failure of a device in the

center of the network affects connectivity between any

of the devices on either side

• Each link in the chain represents network delay

D D

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 105 106

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