Add-On Instructions

Use Add-On Instructions to create instructions for sets of commonly used logic, provide a common interface to this logic, and provide documentation for the instruction. Add-On Instructions include commonly used functions or device control.

Use an vAdd-On Instruction across multiple projects. Define the instructions, use instructions provided by another user, or copy instructions from another project. Once defined in a project, Add-On Instructions behave like built-in instructions in

FactoryTalk Design Studio

.

Add-On Instructions are not a high-level hierarchical design tool. Use programs with routines to contain code for the area or unit levels of your application.

Add-On Instructions can contain a maximum of 2 megabytes of data.

Add-On Instructions allow you to:

Reuse Code	Use Add-On Instructions to promote consistency between projects by reusing commonly used control algorithms. Place the code for an algorithm to be used multiple times in a project or across multiple projects in an Add-On Instruction to make the code modular and easier to reuse.
Provide an understandable interface	Place complicated algorithms inside an Add-On Instruction, and then provide an interface that is easier to understand by making only essential parameters visible or required. Reduce documentation development time by automatically generating instruction help.
Export and import an Add-On Instruction	Export an Add-On Instruction to an .L5X file to import the file into another project. Copy and paste instructions within a project and between projects.
Simplify maintenance	Simplify code maintenance by viewing tag values relative to a specific instance of an Add-On Instruction.