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LogicPro User’s Guide Chapter 17: Dynamic Data Exchange

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3. Enter a time in milliseconds in the Update Interval field.

This field sets up an internal timer that acts as the time

base for polling the controller for Program status.

4. For example, if the Update Interval is set at 3 millisec-

onds, the LogicPro DDE Server polls the controller and

reads the data every 3 milliseconds.

5. Check the Load Default Topic on Start-up box.

6. Click [Setup]. The Select a Topic as the Default

Topic dialog box appears.

7. Select a topic from the DDE topic list.

8. Select the Don’t show warning messages option.

9. Click [OK] to close this dialog, and then click [OK] to

close the Logicpro DDE Configuration dialog box.

All parameters set in the Configuration menu are saved in the

ASCII text file LP_DDE.CFG. You can view this file at any

time.

CAUTION! Never modify the LP_DDE.CFG file directly with a

text editor.

Creating the Application FPR File

Before continuing, you need to create the Dynamic Data

Exchange file to be used with the LogicPro DDE Server. An

.FPR file is created and used by the LogicPro DDE Server

during code generation of your Program. This filename is the

same as the application and is placed in the resource directory.

This .FPR file contains all the information the LogicPro

Server needs to establish communications with the controller.

The file information is updated every time code is generated

for your Program. This .DDE file contains the following

information:

• Program ID — a unique number that matches this file to

the executable file (.EXE) in the controller with the

.FPR file.

• Target — the controller resource you are using.

• Port — how and where the controller is attached, such as

through Com1 serial port.

• Variables — a list of all symbolically named Variables

in the control Program. The list contains:

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Watlow LogicPro Manual de usuario Pagina 277