ClearSCADA supports a series of Parameters that can be used to store static data values, such as a postal address, or map grid reference. Consider using Parameters if the data that you want ClearSCADA to store is:
- Intended to remain static
- Internal to ClearSCADA (it is not associated with plant)
- Not directly associated with other items in the database (such as individual points, outstations, or scanners).
You can use Parameters, for example:
- To display static data on Mimics, or in Reports.
- To store static data used in Logic programs—for example, store the target value for an analog point.
- As an alternative to ‘custom’ fields. (Unlike custom fields, when you add a new Parameter to ClearSCADA, you do not need to restart the server.)
Unlike Variables or Internal Points, users need the Configure permission, rather than the Control permission, to change a Parameter’s value. This provides additional security to help ensure that data that is intended to remain static is only changed by users with that permission.
This section:
- Summarizes the different Types of Parameter that ClearSCADA supports.
- Explains the circumstances that determine when you would use a Parameter rather than a Variable or other database item (see Parameters versus Points and Variables).
It also explains how to:
Also included is a series of examples that demonstrate how Parameters might be used on a ClearSCADA system (see Example Configuration).