Programming instructions

ADT-CNC4620 Programming Manual
- 8 -
1.9. Main program and subroutine
To simplify the programming, if same or similar processing track and control process need to be
used for several times, the program instructions of this part can be edited to independent program
for calling. The program that calls other programs is called as main program, and the program being
called (ended with M99) is called as subroutine. Both subroutine and main program occupy system
capacity and storage space. Subroutine also must have independent program name, and can be
called by any other main proram or run independently. When subroutine ends, it returns to the main
program and continues the execution. The system supports nine layers nesting, i.e. a subroutine can
call other subroutines, as shown in Fig. 1-9 below.
Call Return
Main program Subroutine
Fig. 1-9