Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 52)

F ACTORY T ALK V IEW M ACHINE E DITION U SER ’ S G UIDE
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Collect data
When planning data collection, design your system so only essential data is collected.
Limiting data collection is important because collection activities require substantial
processing power and generate a lot of traffic on the network.
Keep data collection requirements in mind when designing the layout of the
programmable controller data tables and the HMI tag database. Ideally, tag addresses
reference contiguous blocks of programmable controller data tables to reduce highway
traffic and optimize system response. If you’re going to use data from an OPC server, read
the server documentation to find out how to optimize traffic.
Design an HMI tag database
Take the time to plan your HMI tag database. A good design helps reduce the time
required for maintenance and can improve programmable controller-to-FactoryTalk View
response time.
For information about creating HMI tags, see Chapter 7.
If you are going to use direct referencing for all your tags, you don’t need to create HMI
tags in FactoryTalk View.
For information about creating Data Servers to data server tags, see Chapter 6.
Collect information
Before you begin creating the tag database, collect:
 Flowcharts of your processes (or process and instrument diagrams).
 A list of programmable controller data table or register addresses your application will
have access to.
 Machinery systems documentation.
 Alarm requirements (for more information, see page 3-6).
Organize tags
Before creating tags:
 Develop naming conventions for tags, choosing names that are familiar and logical to
everyone. This makes troubleshooting easier.
 Group related tags.
Data Server tags usually update faster than HMI tags. To obtain the best system performance for
your application, use Data Server tags where possible.