Reference Manual

Turbo PMAC/PMAC2 Software Reference

Turbo PMAC Program Command Specification 436

subroutines by following the G-Code with one or more sets of {letter}{data}, as in CALL and

READ statements.

Most users will have G-codes only in the range 0-99, which permits the use of PROG 1000 only and

allows {data’} to equal {data} for direct specification of the line label.

Example:

G01 jumps to N1000 of PROG 1000

G12 jumps to N12000 of PROG 1000

G115 jumps to N15000 of PROG 1010

See Also:

Program commands CALL{data}, D{data}, M{data}, T{data}, RETURN

GOSUB

Function: Unconditional Jump With Return

Type: Motion program (PROG only)

Syntax: GOSUB{data}

where:

 {data} is a constant or expression representing the line label to jump to

This command causes the motion program execution to jump to the line label (N or O) of the same motion

program specified in {data}, with a jump back to the commands immediately following the GOSUB

upon encountering the next RETURN command.

If {data} is a constant, the path to the subroutine will have been linked before program run time, so the

jump is very quick. If {data} is a variable expression, it must be evaluated at run time, and the

appropriate label then searched for. The search starts downward in the program to the end, then continues

(if necessary) from the top of the program down.

A variable GOSUB command permits the equivalent structure to the CASE statement found in many high-

level languages.

If the specified line label is not found, the GOSUB command will be ignored, and the program will

continue as if the command had not occurred.

The CALL command is similar, except that it can jump to another motion program.

Examples:

GOSUB300 jumps to N300 of this program, to jump back on RETURN

GOSUB8743 jumps to N8743 of this program, to jump back on RETURN

GOSUB(P17) jumps to the line label of this program whose number matches the current value of P17, to jump back

on RETURN