Another mechanism of communication between applications and RSLinx is through the DDE server that comes with RSLinx. The DDE server is only available for Rockwell Automation DDE clients in the OEM version. The drawback of DDE connection is that it is slower than OPC. If you decide to use the LabVIEW DDE VIs, then you need to have the full version of RSLinx.This document was created using RSLinx 2.20.01.107.01, Allen Bradley MicroLogix 1500 PLC, ServerExplorer 2.4.1, Lookout 4.5 and the LabVIEW DSC module 6.0.2.. The cable model number used was 1761-CBL-PM02.
Lookout can connect to the RSLinx OPC server through the OPCClient object. This document assumes that you know Lookout. If you do not have any previous experience with Lookout, then we strongly recommend you to go through the introductory material in the Lookout documentation.Note: Lookout currently does not have drivers for the Allen Bradley Control Logix PLCs.
LabVIEW itself is not an OPC Client, but it can be used to communicate to OPC Servers through the DataSocket VIs. DataSockets have an OPC layer, allowing you to read and write to an OPC Server from LabVIEW (or LabWindows/CVI).DataSocket is a technology based on TCP/IP composed of two elements: the DataSocket API and the DataSocket server. The API provides an interface for different data types, converting the data into a stream of bytes that can be sent across a network via TCP/IP. To learn more about DataSocket, visit Integrating the Internet intoYour Measurement System.The following is a brief example of how to connect to RSLinx OPC Server from LabVIEW using our example VI.
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