Rockwell Automation FactoryTalk View Site Edition Users Guide - Manual (Page 208)

F ACTORY T ALK V IEW S ITE E DITION U SER ’ S G UIDE
10–24
• •
•
•
•
The access path is one of the following:
 For communications with an RSLinx OPC server, the access path is the name of a
device shortcut or DDE/OPC topic in RSLinx.
 For communications with other OPC servers, the access path may be optional. For
information about the syntax for the access path, see the OPC server documentation.
The square brackets around the access path are part of the syntax. They do not indicate
optional parameters.
Getting HMI tag data from memory
An HMI tag with Memory as its data source receives its data from internally, from
FactoryTalk View.
To create a memory tag
1. In the form section of the Tags editor, click Memory.
2. In the Initial Value field, type the tag’s starting value. This is the value the memory tag
will have, when you first load the HMI project.
To ensure that a memory tag uses a particular value when the project starts, use the Set
or = (Equal) commands in a startup macro to specify the tag’s value.
For details about using macros, see Chapter 24, Adding logic and control.
The value of a memory tag can also be set using derived tags, events, or graphic
objects.
3. To retain the tag’s value retained when an HMI server shuts down, select the
Retentive check box.
To let the memory tag revert to its initial value the next time the HMI server starts,
clear the Retentive check box.
Creating HMI tags without using the Tags editor
In addition to creating tags in the Tags editor, you can add tags to an HMI server’s tag
database using one of the following methods:
 Create the tags in a third-party application, and import them into FactoryTalk View.
 Create tags from the Tag Browser.
 Import tags from a PLC or SLC database.