Dialog View JScript OPC Item
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JScript OPC items enable computing of OPC Items values using none, one or more variables associated with MIB variables from devices.
In the figure bellow, the item is computed without variables associated with MIB variables. The return value of the associated JScript function is string with information about JScript engine. Please see also example of JScript OPC items using variables associated with MIB variables.

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Figure: Dialog view to define a JScipt OPC item.


Name
arbitrary within address space unique name of the OPC Item that does not contain spaces. It can be edited by hand, imported on line from device or off line from MIB file of a device (the characters like *, ., /, -, :, _, ;, " are not allowed).  

Description
It can be edited by hand or imported from MIB file of a device  

Data type
Data type of the return value from JScript function  

Input items
Configuring of items that will be used as input variables for JScript function  
 
Device  
Device from that variables will be used - device and variables must be configured in advance  
 
JS variable name  
Name of the variable that will be used in JScript function  
 
Item path  
Path to the variable from device - folder, sub folders, variable name. In the list box only variables from chosen device will be listed  
 
Add  
adding of new variable from device  
 
Change  
changing of definition for the configured variable from device  
 
Remove  
Remove variable from list of input variables  

Generate alarms
If checked in, a preconfigured alarm definition will be associated with the OPC item.  
 
Mess. prefix  
A few OPC items can be associated with the same alarm definition. To distinguish alarm messages for distinct OPC items a message prefix can be used.  
Value  
Name of the preconfigured alarm definition  


 


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