Configuring Shared Variable Properties (DSC Module)
August 2007
NI Part Number:
371618C-01
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Note You can use the features the DSC Module adds only for network-published shared variables. |
Shared variable properties determine how the Shared Variable Engine handles a shared variable. The way that you configure a shared variable varies depending on the data type. You can use the shared variable properties to:
- Initialize shared variable values
- Set alarm levels and priorities for the shared variable data
- Log the shared variable to a historical database
- Scale data
- Set deadbands to filter the shared variable data
- Update security settings for the shared variable
You can configure shared variable properties programmatically or manually. To configure properties programmatically, right-click the shared variable constant on the block diagram and select Create»Property from the shortcut menu. You also can use a shared variable control and the SharedVariableIO properties to configure shared variables programmatically. Wire a shared variable control terminal on the block diagram to the reference input of a Property Node, and configure the SharedVariableIO properties as needed.
To configure properties manually, use the Logging, Update Deadband, Alarming, Scaling, Initial Value, Description, and Security pages of the Shared Variable Properties dialog box. You also can configure shared variable properties in the Multiple Variable Editor window.
Changes you make in the Shared Variable Properties dialog box or using the shared variable properties affect the LabVIEW project library (.lvlib). Changes you make using the SharedVariableIO properties do not affect the .lvlib file. The SharedVariableIO properties affect the Shared Variable Engine directly.