Rockwell Automation 2711E PanelBuilder 1400e Modbus Communications - Manual (Page 39)

6–2 Defining Tags
Publication 2711E-6.12 – August 1997
Note: You can use Expressions to perform calculations, logical, and
conditional operations to manipulate the values of tags. See
Chapter 7, “Creating Expressions” in the PanelBuilder 1400e
Configuration Software for Windows User Manual.
The other two data sources you can see in the Tag Database editor,
Memory and DDE, are used only by RSView.
Device
When you create tags for a Modbus application, select Device as the
data source. This means that the data comes from a specific memory
location in a controller that is connected to the Modbus network.
For each tag you must specify a node name, a scan class, and the
physical address within the controller that the tag references. The
node name refers to the controller’s location on the Modbus network;
the scan class determines how often the terminal checks the value at
this address. See Chapter 2, “Planning Applications,” in the
PanelBuilder 1400e Configuration Software for Windows User
Manual, for details on configuring nodes and scan classes. Appendix
A of this manual contains a worksheet to help you plan scan classes.
This section describes how to fill in the fields for analog, digital,
string, and block tag types. Use the information you entered on the
Device Tags worksheet described in Chapter 2, “Planning
Applications,” in the PanelBuilder 1400e Configuration Software for
Windows User Manual. The Device Tags worksheet is included in
Appendix A of this manual.
Note: The Log Data and Alarm check boxes in the Tag Database
editor are present to maintain compatibility with RSView databases.
You cannot use them in PanelBuilder.
Tip: For information about assigning tag addresses that optimize
network traffic, see “Guidelines For Organizing Tags to Optimize
Network Performance” in Chapter 2, “Planning Applications,” in the
PanelBuilder Configuration Software for Windows User Manual.
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Data Sources
Configuring Tag Type
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