Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 136)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
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Adding servers for redundant operation
To provide secondary application servers in the event that the primary servers goes out of
service, set up redundant HMI servers and data servers.
You must set up redundancy separately for each server in an application. For more
information, see Chapter 14, Setting up FactoryTalk system availability.
Adding servers for load balancing
Over time, an HMI project might increase in size, or the number of clients connecting to
an HMI server or data server might increase to the point where the computer running the
server becomes overloaded.
To balance the load, install another HMI server or data server on a separate computer, and
then move some of the HMI project components, or some of the OPC server tags, to the
new server. This distributes processing more effectively across computers.
Running multiple HMI servers
Each area in a network distributed application can contain only one HMI server.
When deploying a network distributed application for production, ensure that there are no
more than two HMI servers running on each host computer. If the HMI servers are
primary and secondary partners in a redundant pair, only one server per computer is
permitted.
For more information about system limits and requirements, see Chapter 14, About
FactoryTalk View SE system limits..
Providing HMI server names
The FactoryTalk Directory stores HMI server names and does not delete them, even if you
remove an HMI server from all the applications, in which it is used, and then delete the
HMI server’s project files.
This means that every HMI server must have a unique name:
 You cannot re-use an HMI server’s name, even after you delete the HMI server from
an application.
 If multiple users share the same FactoryTalk Directory, the names of all HMI servers
created by all users must be unique.
If you plan to deploy a network distributed application that uses more than two servers (or two
pairs of redundant servers) and 20 clients, or if you would like architectural assistance, contact
your local Rockwell Automation Sales office for architectural assistance. For information about
setting up redundant FactoryTalk View SE Servers, see Chapter 14, Setting up FactoryTalk
system availability.