NI-DAQ OPC Server Troubleshooting Wizard: Configuration Verification (Virtual Channels)
PrintConfiguration Verification (Virtual Channels)
Test all your virtual channels in Measurement & Automation Explorer (MAX). 1. Right-click on the first virtual channel under Data Neighborhood and select Test.
Figure 1.
2. Browse through the channel list on the left side of the test panel. Make sure all channels can 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 is red. Click Details for the error description. Also refer to the Data Acquisition Support pages (linked below) for more information.
Figure 2.
3. Passing all steps in MAX is a necessity, but this 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. In this case, the individual tests pass, but simultaneous access fails. In the vast majority of cases, the analog inputs are the root cause of the problem.
Use the LabVIEW DAQ VI linked below 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).
If you receive error -10007 when running this VI, you are likely to have two virtual channels configured for the same physical channel. Locate the virtual channels in MAX and correct the duplication. Refer to the DAQ documentation and/or to the Data Acquisition Support page (linked below) for more information.
Continue to NI-DAQ OPC Server Troubleshooting Wizard: Verifying Installation.
See Also:
LabVIEW Virtual Channels Test (AI) VI
Data Acquisition Support
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