NCT Group 99M, 2000M manual M99 P

				13 Part Program Configuration
main program		subprogram	comment
O0010			execution of program
......			O0010
......
......	–––>
N101 M98 P0011		O0011	calling sub-program
			O0011
		......	execution of sub-
		......	program O0011
	<–––	......
N102		M99	return to the next
			block of the calling
			program
......			resumption of program
......			O0010

The use of instruction

M99 P...

in a sub-program means the end of that sub-program, and the program execution returns to the block of calling program specified at address P. In this case the limit values of P are to 99999.

main program		subprogram	comment
O0010			execution of program
......			O0010
......
......
N101 M98 P0011	–––>	O0011	calling sub-program
			O0011
		......	execution of
		......	subprogram O0011
		......
N250	<–––	M99 P250	return to the N250
			block of the calling
			program resumption of
			O0010
......
......
Instruction
M99 (P	) L....

will rewrite the cycle counter of the calling program. With 0 written for L, the sub-program will be called only once. If, e.g., subprogram O0011 is called with instruction M98 P11 L20, and a return is made with instruction M99 L5, subprogram O0011 will be called 6 times. (The limit values of L are 1 to 9999.)

LNote:

–An error message 3070 NOT EXISTING BLOCK NO. P is displayed when the return block number (P) is not found in the calling program.

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