Solution
Warning -1950679034 is a warning that the shared variable you are trying to read has no known value.
- LabVIEW DSC Module - Applications developed using the LabVIEW DSC Module and deployed as executables require the LabVIEW DSC Run Time to be installed and activated on the target PC. The warning can be generated if the run time module is not installed or activated correctly.
- Correct IP Addresses - If your shared variable is hosted on a Real-Time system, check that the IP address of the target in the LabVIEW project matches the IP address of the Real-Time target hardware. If the IP address is incorrect, LabVIEW may be looking for the variable in its previous location.
- Set Initial Value - If you have just created or deployed the variable, it may not have been written to yet. If you have created an I/O Server, there could be a communication failure preventing the shared variable from receiving data.
You can prevent this warning by enabling the Initial Value option on the shared variable properties page. Once you set an initial value, you will have to redeploy the library.
- In the LabVIEW project, right-click the shared variable and select Properties.
- In the Initial Value tab, check the Enable Initial Value checkbook. Set the desired Initial Value.
- In the LabVIEW project, right-click the library and select Deploy All.
Alternatively, you can initialize the shared variable by writing a value to the variable either in your code or using the Distributed System Manager.
If working with an OPC Server where LabVIEW is reading variables from the server and receiving this error, make sure you are running the variables in some sort of loop. It is necessary to give the network communication time to respond, otherwise LabVIEW will give this Warning and report 0 as the value.