In which mode switch position can a CNC program be modified?

The CNC program can be modified in the Edit mode. This mode is specifically designed to allow operators to change, update, and adjust the parameters and code of a CNC program directly at the machine. In this mode, users can incorporate adjustments to tool paths, speeds, feeds, and other critical elements of the program without affecting ongoing operations.

While in the Run mode, the CNC machine executes the programmed instructions, making it impossible to modify code at that time. The Home position refers to the machine's starting point for operations and does not provide an interface for program changes. Setup mode is typically used for preparing the machine or workpiece, including aligning tools and setting offsets, but it also does not permit program modification. Therefore, Edit mode is the correct choice as it is the designated setting for making real-time changes to the CNC program.