PLC Processors

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.
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