DDE/OPC Topic Configuration

In RSLinx Classic, a topic represents a specific path to a processor. If you right-click a station in

RSWho

and select

Configure DDE Topic

, or if you select

DDE > Topic Configuration

, the

DDE/OPC Topic Configuration

dialog box opens.

A DDE project is a storage container for one or more DDE topics. If you attempt to create a DDE topic without having created a DDE project, a default DDE project is created for you.

If you selected

Configure DDE

Topic by right-clicking on a station in

RSWho

, the Topic Name box is pre-filled. RSLinx Classic starts with the name of the program running in the processor, and if this DDE topic exists, it adds a number to the end until it finds one that does not exist. If there are any spaces, it converts them to _'s. You can change the topic name RSLinx Classic selected for you.