Tips for using instances of Add-On Instructions

Programming tips for using Add-On Instruction instances include:
Programming tips for using Add-On Instructions
Item
Description
Ladder rungs
Specify if the instruction will execute on a false rung condition if executing the instruction improves scan time.
Data types
The tag that provides the context for executing the code uses a data type defined with the Add-On Instruction instance. Define a tag of this Add-On Instruction-defined type on the call to the instruction.
Indexed tag
Use an indirect array indexed tag for the Add-On Instruction instance. You cannot monitor the Add-On Instruction by using the indexed tag as a data context.
Passing data
  • Values pass Input and Output parameters.
  • References pass InOut parameters.
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