How can reusable code be implemented in ControlLogix?

Using Add-On Instructions (AOI) is a robust way to implement reusable code in ControlLogix systems. AOIs are essentially user-defined instructions that allow programmers to package frequently used logic into a single, modular unit. This modular approach promotes reusability across different projects or applications, saving time and effort in programming.

When creating an AOI, you define its functionality once, and then it can be called upon multiple times throughout the project or even across different projects, leading to a streamlined programming process. This encapsulation of code also fosters better organization, making the overall program easier to manage and understand.

In contrast, while global variables can share data across different procedures, they do not encapsulate logic or functionality. Writing extensive documentation is important for understanding code but does not make the code itself reusable. Limiting code complexity can improve readability and maintainability, but it is not a direct method for reusing code. Hence, AOIs stand out as the most effective and practical solution for creating reusable code in ControlLogix.