Logic not Executing Methods Correctly

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In some cases, object methods may not be run even though the logic program is configured to call them is displaying no warnings or errors.

This may be caused by method calls failing due to objects being out of service. Even if the method itself is available, if a method called prior to that one is unavailable, the method will not execute.

The basic logic execution sequence is as follows (for more indepth information see Logic Execution):

• Read input tags & queries

• Execute code

• Write output tags & queries

• Execute queued method calls

If an error occurs at any point, the sequence is ended. If a method call fails, then the rest of the queued methods are not executed. Methods are not executed when they are encountered but queued for execution after the program finishes. This means that the method call failures will not cause the logic to stop running.

From ClearSCADA 2005 R0, there is a property on logic programs named 'Ignore Method Errors'. This changes the behaviour of logic execution so that all methods are executed regardless of whether any of them fail.

To obtain further information on logic program errors:

• Display the Queries Bar

• Select 'Logic Execution Status'

• Locate the relevant program in the list and check the 'Error Message' column.

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