Which statement describes the function of Add-On Instructions (AOIs) in ControlLogix?

Add-On Instructions (AOIs) in ControlLogix are designed to facilitate the creation of reusable code segments. By encapsulating commonly used logic into an AOI, programmers can significantly enhance the efficiency and consistency of their applications. These instructions allow for the integration of complex control logic that can be easily called and reused throughout different parts of a program or across multiple projects. This reusability not only saves programming time but also helps to reduce the likelihood of errors, as any modifications to the AOI will automatically propagate through all instances where it is used.

This characteristic of being reusable and encapsulated makes AOIs a powerful tool for standardization and efficiency, enabling developers to focus on higher-level design rather than repetitive coding tasks. Consequently, the ability to maintain and troubleshoot systems becomes easier, as AOIs can be tested and validated in isolation before deployment in various applications.