Principles involved in the function of the flexible manufacturing system are explained in the previous table. To start with, a program is loaded in the computer, and when it is run, the computer schedules, monitors and controls the machining operations for a specified number of parts.

The computer continuously monitors the components under its control and makes necessary decisions concerning the various functional aspects of the system. These aspects are material handling, inspection, measuring, component washing, tool change, tool storage, tool life, fixturing machining and warehousing. The function of the computer is to identify the needs of the FMS components and to meet those needs, allocate resources at its disposal in the form of machining cells, tools, fixtures, material handling systems and inspection modules.

There is no human interference in the machining process. It occurs only when there is a breakdown in the system function. If a breakdown occurs, the system diagnoses the problem and sends a signal with a message to the maintenance personnel.