LabVIEW Datalogging and Supervisory Control

NI-DAQ OPC Server Troubleshooting Wizard

Configuration Verification (Virtual Channels)

Test all your virtual channels in the Measurement & Automation Explorer (MAX).
1. Pop up on the top channel in the Data Neighborhood and select Test.

   

   
   
2. Browse through the channel list on the left side of the Test Panel. Make sure ALL channels are able to pass the test and you have at least ONE channel configured. If there is a channel error, the Error indicator in the top-right corner will turn red. Click the Details button to get the error description. Also refer to the Data Acquisition Troubleshooting web resources for more information.

   

   
   
3. Passing all steps in MAX is a must, but is not always sufficient. MAX tests all channels individually, but the NI-DAQ OPC Server accesses all channels simultaneously. This can make a difference - for example, if two virtual channels point to the same physical channel. The individual tests will pass, but simultaneous access will fail. In the vast majority of cases, the analog inputs are the root cause of the problem. Use the attached LabVIEW DAQ VI to run an OPC-like data acquisition. Make sure you match the update rate on the panel with the OPC client update rate (use the default if you are not sure).

   Virtual Channels Test (AI) VI

   

   
   If you receive error -10007, you are likely to have two Virtual Channels configured for the same physical channel. Locate the Virtual Channels in MAX and correct the duplicate. Refer to the DAQ documentation and/or to the Data Acquisition Troubleshooting web resources for more information.

   

   
   

Continue to Test Installation.