This module is intended to familiarize the student with the most important aspects of the PLC's central processing unit with a focus on the ControlLogix processor. Topics covered in the module include memory devices, memory storage, and data processing as well as an introduction to tag-based memory. In addition to covering memory utilization and protection, the module also provides detailed information on multiprocessing and PLC scan functions.

Learning Outcomes:

Upon completion of this module the student will be able to:

• Explain the difference between a CPU and a MPU.
• Name the four basic functions of a CPU.
• Differentiate between volatile and nonvolatile memory.
• Define "flash memory".
• Describe the main purpose of the scan cycle in a PLC.
• Name two types of PLC memory protection.
• List the major features of Controllogix controllers.
• Explain the purpose of tag-based memory
• Describe the difference between a project and a task.