This is going to be a very easy step-by-step walk though on how to create an Add-On Instructions (AOI) from scratch Studio 5000 Logix Designer (Version 32).
These steps are also applicable to Rockwell RSLogix 5000 and RSLogix 500 (Allen-Bradley).
We will be going to create a very simple AOI ladder logic that has two arguments; INPUT_VAL and OUTPUT_VAL. If the INPUT_VAL is greater than 100, it returns TRUE via an external variable called OUTPUT_VAL. Else it returns FALSE. This can also be done in Function Block Diagram or Structured Text.