VBScript Reference Manual for InduSoft Web Studio

InduSoft Web Studio VBScript Reference Manual
To create an explicit constant, you use the keyword Const. You cannot use a function or another
constant as part of the explicit value. You cannot use an expression with a VBScript Operator. For
example:
Const Threshold = 101.5 ‘ Explicit constant Threshold has a value of 101.5
Const MyColor = &hFFFF ‘ assigns a color constant to MyColor
Const CrLf = Chr(13) & Chr(10) ‘ Not allowed to use a function
Const MyVal = 2 + 4 ‘ Not allowed to have an operator in assignment
String literals are enclosed in double quotation marks (“), while date and time literals are enclosed in
hashes (#). For example:
Const MyString = “Hello World”
Const StartDate = #4-1-2006#
After creating the constant, you can use the constant name in lieu of specifying an explicit value. For
example:
Dim Alarm1, Alarm2
Const Threshold = 101.5 ‘ Create a constant, value = 101.5
Alarm1 = Threshold ‘ Assigns the constant to the variable Alarm1
Alarm2 = Threshold + 5 ‘ Adds 5 to the constant and assigns to Alarm2
Key Notes:
• Use the following formats to assign constant values
Const MyVal = &hFFFF to assign a hexadecimal value
Const MyVal = "Hello" to assign a string value
Const MyVal = “He was “”lost””” to embed quotation marks
Const MyVal = #9-11-2001# to assign a date and time literal
• Use the same naming rules for variables as for constants
• Can’t use functions or operators in the assignment statement
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