![]() Next, we're going to set up a DDE/OPC Topic in RSLinx. I'm not going to do anything with the PLC program, I just need some data in a number of tags. In this example, I created 2 arrays, of the types DINT and REAL, each with a length of tags. Let's fire up RSLogix first, and create a bunch of tags with values. RSLinx (not the 'Lite' version, because that does not have DDE/OPC capabilities).Microsoft Excel, with some basic knowledge about programming macro's in Visual Basic. ![]() ![]() In this article, I will show you how to create one of these sheets for your projects. Have you ever lost data in a CLX processor, because you downloaded new code? Unfortunately, when you donwload a program to a ControlLogix processor, you also download the values of the tags (variables).Ī solution to this problem that could be useful, is an Excel sheet that reads and writes values to the ControlLogix processor using the DDE/ OPC capabilities of RSLinx. ![]()
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