Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 125)

6 • W ORKING WITH NETWORK DISTRIBUTED APPLICATIONS
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 One or more data servers, providing clients with access to information in
programmable controllers, devices, and other data servers that comply with the OPC-
DA 2.05a specification, with or without the use of HMI tags.
In a network distributed application, you can use multiple RSLinx Enterprise and OPC
data servers (including RSLinx Classic), running on different computers. You can also
set up a redundant pair of host computers for each data server in the application.
RSLinx Enterprise servers can be set up to subscribe to alarms detected in devices
such as ControlLogix controllers. For more information, see Chapter 12, Setting up
FactoryTalk alarms.
 A list of users, plus the security codes that allow or deny these users permission to
access secured HMI project components at run time.
 Optionally, one or more FactoryTalk Tag Alarm and Event Servers, to provide alarm
monitoring and control for tags in devices that do not have built-in alarm detection.
For more information, see Chapter 12, Setting up FactoryTalk alarms.
The software programs behind a network distributed application—the FactoryTalk
Network Directory, the HMI servers, the HMI clients, and the data servers—can be
located on different computers on the network.
However, all the computers participating in a network distributed application must point
at the same Network Directory. For details, see Chapter 4, Setting up the FactoryTalk
Directory.
About FactoryTalk systems
FactoryTalk View SE and other Rockwell Automation software products use a set of
common FactoryTalk services to support certain functions, such as diagnostic messages
and access to real-time data.
These services, including FactoryTalk Directory, are installed with the FactoryTalk
Services Platform when you install FactoryTalk View SE. For an overview of FactoryTalk
services, see page 1-1.
An automation and control system that uses FactoryTalk services, and integrates
FactoryTalk products and components, is known as a FactoryTalk system.
Every vendor’s OPC data server is different. Some contain their own tag databases, like the
tag database in an HMI server, while others reference the tag databases or addresses that
exist in controllers, as is the case with RSLinx and Logix5000.