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RSView Supervisory Edition Installation Guide

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All the computers participating in a particular application share a<br />

common FactoryTalk Directory located on a network server.<br />

If FactoryTalk Directory becomes unavailable while an application is<br />

running, the application will continue to run correctly because a copy<br />

of the information provided by FactoryTalk Directory is stored locally<br />

on each computer that is connected to the FactoryTalk Directory<br />

computer. <strong>RSView</strong> SE clients that are connected to the application will<br />

be able to continue running without restarting the system. Clients that<br />

were not connected to the application before the FactoryTalk<br />

Directory went down, will not be able to do so until service is restored.<br />

For details about FactoryTalk Directory, see Chapter 4, Setting up<br />

FactoryTalk Directory.<br />

Redundancy<br />

In process monitoring and control automation, redundancy refers to<br />

the ability of the system running the process to continue to work<br />

correctly when one or more parts of the system become unavailable, or<br />

fail, by setting up pairs of the critical systems components such as data<br />

servers, on paired computers. One of the servers acts as the primary<br />

server, and the other is the secondary, or backup, server.<br />

How <strong>RSView</strong> SE clients respond to server disruptions<br />

During server disruptions, users do not have to restart the <strong>RSView</strong> SE<br />

client software to continue using the system. Once the system has<br />

switched to the secondary HMI server, or data server, <strong>RSView</strong> SE<br />

clients continue functioning normally.<br />

About HMI-server redundancy<br />

You can set up redundant operation for HMI servers to provide<br />

minimal disruption of system operation in the event that clients lose<br />

service from a server, for example because of network or computer<br />

failures.<br />

Working with distributed applications 5–7

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