Technical Reference Manual - InduSoft

Overview of VBScript
The following illustration shows the scope of each VBScript interface and the order in which they are scanned
by IWS:
The illustration shows that the Global Procedures are shared by the Graphic Module and the Background
Task. However, the other VBScript interfaces are either from the Graphic Module or from the Background
Task, and they do not share variables or procedures between them. They are independent of each other.
Note: Although the Graphics Script is scanned by IWS before the Screen Scripts, the procedures
and variables declared in the Graphics Script interface are NOT available for any script interface
configured on the screens. You must use the Global Procedures interface to implement procedures
that must be available for all screens.
When writing your code in a VBScript interface, you can access any tag from the IWS tags database or any
function from the Built-in Scripting Language by applying the "$" prefix to the tag/function name, as in the
examples below:
$Time 'Returns the value of the tag Time from the tags database
$MyTag 'Returns the value of the tag MyTag from the tags database
$Open("main") 'Executes the Open() built-in function to open the "main" screen
Therefore, you can create scripts using built-in functions from IWS, tags from the IWS tags database,
VBScript functions, VBScript variables, ActiveX properties, methods or events, and any other interface
available. The IWS tags are shared by all modules from IWS, including the Graphic Module and the
Background Task.
Global Procedures
This Procedures interface is used create a library of VBScript functions and sub-routines that can be called
by any other scripting interface in InduSoft Web Studio. The procedures declared here are never directly
executed during runtime; they must be explicitly called by another script.
Caution: InduSoft Web Studio will not prevent you from declaring two or more functions with the
same name. (This includes functions imported from external files; see "Importing Functions from
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InduSoft Web Studio