Rockwell Automation FactoryTalk View Machine Edition Users Guide - Manual (Page 102)

F ACTORY T ALK V IEW M ACHINE E DITION U SER ’ S G UIDE
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 Click the browse button ( ) next to Find what.
 From the Tag Browser, navigate to the correct folder in the left pane, and then
select the tag in the right pane then click OK to save the selection and close the
browser.
3. If needed, identify the type of product components to search in Find within (all
components are selected by default):
 Click the browse button next to Find within.
 From the Find within dialog box, select the product component types to be
searched then click OK to save the selection and close the dialog box.
4. Click Search to show all the found items in a spreadsheet form.
5. You can double click any of the found items to open it with the appropriate editor.
Data sources
When creating an HMI tag, you must specify a data source. The data source determines
whether the tag receives its values externally or internally.
The data source
The FactoryTalk View documentation uses the term data source as a generic term that
includes all possible sources of tag data, for both data server tags and HMI tags. The data
source can be memory or a device such as a programmable controller or an OPC server.
FactoryTalk View writes values to and reads values from the data source. The data source
is set up to exchange information (in the form of numeric or string values) between the
FactoryTalk View value table and the machine that your application is controlling.
Device
A tag with device as its data source receives its data from a source external to FactoryTalk
View. The data can come from a programmable controller or other device via RSLinx
Enterprise, or from another OPC server. You can use up to 5,000 device tags.
For analog tags with Device as the data source, the data type determines the format used
when reading and writing tag data to the data server.
Do not create HMI Tags that are pointing to a System Tag. When a project contains an HMI tag
pointing to a System Tag, users may fail in creating an MER or have runtime performance issues.