A group of commands given to the CNC for operating the machine is
called the program. By specifying the commands, the tool is moved along
a straight line or an arc, or the spindle motor is turned on and off.
In the program, specify the commands in the sequence of actual tool
Tool movement sequence
Fig. 1.7 (a) Program configuration
A group of commands at each step of the sequence is called the block.
The program consists of a group of blocks for a series of machining. The
number for discriminating each block is called the sequence number, and
the number for discriminating each program is called the program
number (See II–13).