Watlow LogicPro - Manual (Page 280)

Chapter 17: Dynamic Data Exchange LogicPro User’s Guide
264 Watlow Anafaze Doc.# 28002-00 Rev 3.00
NOTE! Once the topic is deleted, it cannot be recovered.
Make sure you really want to delete the topic be-
fore you do so.
Item Point Naming
In LogicPro, an item is a symbolically named Variable. Items
can be read or written to through the LogicPro DDE server
with the exception of real world I/O points. If the values of
these points are changed by the LogicPro DDE Server, the
scan loop of the controller will overwrite these changes.
Finding The Available Item Names
Once a topic is opened, you can acquire a list of available
symbolic names for that application Program by selecting the
Topic Info menu then Variables . The Variables List
dialog box appears with a complete listing of available names,
including Real-time values.
Excel Spreadsheet DDE Sample
In this example, Excel is used with the LogicPro DDE Server.
To run this example, you need:
• LogicPro v2.0 or greater.
• LogicPro DDE Server.
• Microsoft Excel v4.0 or greater (v5.0 is strongly
recommended).
The Program, Example 1, shown in Figure 17.1 on page 265,
continuously increments six timers.