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1. M98 should be used together with M99. When M98 is used alone, the subprogram can only be called once instead of L (L＞1) times.
2. When the program has M99 without M98, the program ends after executing M99.
3. M98/M99 can be contained in the subprogram call, i.e. they can be nested; up to 18 levels of M98/M99 subprogram call can be nested.
4. The subprogram is usually behind M02/M30 of the main program, and the last block of thisprogram must be M99 (subprogram return). If the subprogram is not behind the main program, M97 command should be used for program transfer. (see the following example)

【Example】

Fig. 3-1 M98 M99 subprogram call cutting example

Two programming methods as Fig.3-1:

N0010 G00 X100 Z50		N0010 G00 X100 Z50
N0020 M03 S01		N0020 M03 S01
N0030 G0 X50 Z15 F500		N0030 G0 X66 Z15 F500
N0040 M98 P0060 L5	Call subprogram	N0040 M98 P0060 L5	Call subprogram
N0050 M97 P0130	Transfer program	N0050 G0 X100 Z50
N0060 G0 U-4	Subprogram is inserted in the main program	N0060 M05
N0070 G01 Z-10 F80		N0070 M02	End of main program
N0080 U20 Z-25		N0080 G0 U-4	Subprogram follows the main program
N0090 Z-35		N0090 G01 Z-10 F80
N0100 G0 U2 Z1		N0100 U20 Z-25
N0110 U-22		N0110 Z-35
N0120 M99		N0120 G0 U2 Z1
N0130 G0 X 100 Z50		N0130 U-22
N0140 M05		N0140 M99
N0140 M02	End of main program
Transfer the program with M97. Otherwise, the program does not accord to the actual machining requirement.		The subprogram must follow the main program without M97

Method 1: When the system executes N0040, it calls the subprogram and executes N0060－N0120

five times. Then it executes N0050，and the program skips to N0130 and executes the

following blocks.

Method 2: When the system executes N0040, it calls the subprogram and executes N0080－N0140

five times, and then executes blocks from N0050 to N0070, and so the

KET: ALFITRA NANDA
         NANUNG DARMAWAN

         OLGA YOGANTARA