Reading a few WonderWare (RSLinx) tags from LabVIEW (client only)

We have a customer that uses WonderWare and Net DDE. We need to read a few WonderWare tags from a LabVIEW application running on a separate computer. I am sure this has been done before but I cannot find a good example that demonstrates the format to use for computer name, service, topic, item name when talking to WonderWare. I could only find an Access and Excel example.
All we need to do is connect to and monitor a few existing tags in WonderWare from another computer on the LAN running a LabVIEW application.
I would prefer to use OPC but they have been using Net DDE for years and do not want to change.
We cannot use LabVIEW DSC.

If you can't use LabVIEW DSC, then your best option would be to use DataSocket to connect to your OPC server. You can find a couple tutorials on DataSocket and using it with OPC servers here and here. These tutorials give information on the syntax to use when connecting to your OPC server.
Another option would be to stick with NetDDE. You can find a tutorial here on using NetDDE with LabVIEW.
Jarrod S.
National Instruments

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Read PDF file.jpg ‏201 KB
Show PDF-file - Adobe Reader 5-0-5 - LV61.vi ‏42 KB

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Attachments:
manual_writing_to_plc.png ‏298 KB

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Preston Johnson
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Industrial Applications
National Instruments
Preston Johnson
Principal Sales Engineer
Condition Monitoring Systems
Vibration Analyst III - www.vibinst.org, www.mobiusinstitute.com
National Instruments
[email protected]
www.ni.com/mcm
www.ni.com/soundandvibration
www.ni.com/biganalogdata
512-683-5444

Reading a few WonderWare (RSLinx) tags from LabVIEW (client only)

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