PLC glossary
AOI
A reusable instruction an engineer defines for a repeated job. Each use needs separate storage when its machines must act independently.
- Also called
- Add-On Instruction, add on instruction
- On site
- A factory uses one tested pump instruction for several independent pumps.
- Siemens
- A Siemens FB provides a comparable reuse pattern, with different interfaces and lifecycle rules.
- Rockwell
- A Logix Add-On Instruction definition is called with a backing instance tag.