What is the term used for the portion of PLC memory allocated for program storage?

The term used for the portion of PLC memory allocated for program storage is "data files." In the context of PLCs, data files are specific memory areas designated for storing program instructions and structured data. They serve as repositories for the program logic that the PLC executes to control processes or machinery.

Data files can encompass various elements such as the main program structure, subroutines, and any supporting data that the logical operations may require. Utilizing data files allows the PLC to keep the application organized and efficient, facilitating easier updates and modifications to the control logic.

The nature of data files ensures that the PLC has quick access to the necessary instructions during operation, which is critical for real-time control processes. The concept of data files is integral to the organization of PLC programming, as it distinguishes between where program logic is stored versus where operational data or runtime information is kept.