Weidmuller SL-MOD-GW Manuel d'utilisateur télécharger pdf (Page 22)

A.22

WAUS Data Products Main Line Catalogue 2013

Active Components

Ring Redundancy

Ring is the most efcient way to realise redundancy. For

Weidmuller switches any port can be used to build a ring.

The wiring system of the Ring is also like a physical ring,

which can prevent the whole system breaking down along

with one single error. In normal conditions one link of the

Ring doesn't work thus avoiding

loop road.

W-Ring makes the automatic change-over possible in less

than 20 ms and guarantees the reliability of transmission.

Status of the ring can be checked by visiting the Web page

of any switch in the ring. Also you can use the Ring to

achieve the redundancy between the rings by arranging two

links instead

of one.

RSTP Redundancy

Based on IEEE 802.3w, RSTP (Rapid Spanning Tree

Protocol) builds a structure similar to a web and is able

to support more functions by realizing more than one

redundancy. RSTP is an ideal choice for complex network

with unknown linking path. As RSTP must analyse the

whole network when choosing the redundant path, so it

takes more time than ring redundancy. In some big network

systems, the change-over time of RSTP may be as long as

several seconds.

Weidmüller switches support IEEE802.1s Multiple

Spanning Tree Protocol (MSTP). MSTP is backwards

compatible with RSTP and classic STP. MSTP allows

multiple redundant paths and balances the load between

paths for greater efciency.

Ring domain

RSTP domain

RSTP transparent

Optimum root by

RSTP

Loop path

W-Ring+

W-Ring

Redundancy in Industrial Ethernet Networks

To keep the industrial automation system running efciently and problem-free, you need an industrial Ethernet system with

high availability and fault-tolerance. Yet almost every device in a network can create errors or stop communication. The

solution is redundancy. Redundancy is a process of adding redundant devices then arranging them according to safety rules.

Extreme industrial environments, such as vibration, temperature difference, or swiching off may easily cause error, especially

in connecting parts like cables and connectors. There are two ways to introduce redundancy into Weidmuller Managed

Switch networks: one is Ring, the other is spanning tree.

Managed Industrial Ethernet Switches

Active Components | Managed Industrial Ethernet Switches

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Weidmuller SL-MOD-GW Manuel d'utilisateur Page 22

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