From the course: PLC Memory Organization
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Allen-Bradley PLCs memory structures - Ladder Logic Tutorial
From the course: PLC Memory Organization
Allen-Bradley PLCs memory structures
- [Instructor] The different types of Allen Bradley controllers deal with data in terms of storing and retrieving them according to the memory structure of the controller. Allen Bradley controllers have two different memory structures; rack-based system and tag-based systems. MicroLogix controllers and SLC 500 series of controllers use a rack-based fixed memory structure. CompactLogix controllers use a tag-based system that has a flexible memory structure. Finally, ControlLogics series of controllers also use a tag-based memory structure for assigning and referring to memory locations. Understanding the different memory structures helps in the programming process as we need to know where the data are stored and how to assign and refer to memory locations in order to use them in the Ladder Logic Programming.
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