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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.

1 2 ... 275 276 277 278 279 280 281 282 283 284 285 ... 295 296

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