In the Project Editor, select Tags | SPC Tags. The SPC Tags dialog box will display:
For each SPC tag, in the Cluster Name field, select the cluster that will run the SPC tag. If there is only one cluster defined in the project, you can leave this field blank. The SPC tags will default to the defined cluster.
If the project has multiple clusters, and you do not select a cluster in this dialog, CitectSCADA considers the tag to run on defined clusters.
Click Replace to save the changes.