What is a FANUC macro?

A FANUC macro is essentially a programmable subroutine that allows users to execute complex operations in CNC programming. It provides a way to automate repetitive tasks, streamline processes, and enhance the functionality of the CNC machine. By utilizing macros, operators can write a set of instructions that can be called multiple times during a program, thus reducing the need for extensive, repetitive code and improving efficiency.

The primary function of macros is to simplify programming by enabling more sophisticated control over machine operations. This can include parameter-driven operations, where the macro can take inputs to modify performance based on specific needs, thus providing flexibility in machining tasks.

In contrast, the other options refer to different concepts unrelated to the functionality of a FANUC macro. Physical tools are tangible equipment used in the machining process, safety protocols are measures implemented to ensure the safety of operations and personnel, and a literature review involves summarizing existing research rather than operational programming. Therefore, the accurate description of a FANUC macro being a programmable subroutine for complex operations is the most fitting.