Technical Reference Manual - InduSoft

Introduction
function. This process can take several milliseconds or even seconds, depending on how you
configured the script in the Math worksheet (especially for loops).
If you configure a Math function for a screen object, the Viewer stops updating the screen until the
Viewer executes the entire Math worksheet called by the Math function.
If you must use the Math function for the Scheduler task or a screen object, we recommend using
the following procedure to prevent process delays:
1. Specify one auxiliary tag with the value 1 and the Scheduler or Viewer task will send a message
to the Tags database to update this tag value.
2. Configure the tag in the Execution field of the Math worksheet to be executed. When the
Background Task scans the Math worksheet, IWS will execute the worksheet.
3. Reset the tag in the last line of the Math worksheet (write the value 0 to the auxiliary tag).
As a result, the Background Task will not execute the Math worksheet in the next scan unless the
auxiliary tag is set to the value 1 again.
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