Answer: C. Manually input the program using the keyboard.
Analysis:
There are many ways for the CNC system to obtain the workpiece processing program, among which MDI is the way to manually input the program using the keyboard. MDI, the full name of which is Manual Data Input, is an important working mode of CNC machine tools.
In MDI mode, the operator can directly input the compiled program into the CNC system through the keyboard on the CNC machine tool operation panel, and can display the relevant content on the display.
This method is characterized by simple input, convenient inspection, verification and modification, and is particularly suitable for the processing of parts with simple shapes and short programs.
In addition to the MDI method, the CNC system can also obtain the workpiece processing program in other ways, such as:
* Read the program with a disk drive: This method requires the program file to be stored in a storage medium such as a disk, and then the program is read through the disk interface of the CNC system. This method was more common in early CNC systems, but with the development of technology, its frequency of use has gradually decreased.
* Receive programs from serial communication interfaces: Modern CNC systems generally support network communication functions, and can receive program files from computers or other devices through serial communication interfaces (such as RS-232, RS-485, etc.). This method has the advantages of fast transmission speed, long distance, and high reliability.
* Receive programs from the network through a modem: In some cases, the CNC system can also connect to the network (such as the Internet, LAN, etc.) through a modem and receive program files from the network. This method requires the CNC system to have a network communication module and corresponding software support, which can realize functions such as remote program transmission and online programming.
In summary, MDI is a way for CNC systems to manually input programs through keyboards, and it is an indispensable part of CNC machine tool work.