Reference Manual

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Turbo PMAC/PMAC2 Software Reference

Turbo PMAC Program Command Specification 416

 {letter} is any letter of the English alphabet, except N or O, representing the variable into which

the value following it will be placed (Q101 to Q126 for A to Z respectively);

 following {data} is a floating-point constant or expression representing the value to be put into the

variable

This command allows the program to execute a subprogram and then return execution to the next line in

the program. A subprogram is entered into Turbo PMAC the same as a program, and is labeled as

PROGn (so one program can call another as a subprogram). The number n of the PROG heading is the

one to which the value after CALL refers: CALL7 would execute PROG7 and return. Commanding

execution of a non-existent subprogram will cause program execution to stop in an error condition.

The value immediately following CALL can take fractional values. If there is no fractional component,

the called program starts at the beginning. If there is a fractional component, the called program is

entered at a line label specified by the fractional component (if this label does not exist, Turbo PMAC

will generate an error and stop execution). Turbo PMAC works with five fractional digits to specify the

line label; if fewer are used, it fills out the rest with zeros automatically. For instance, CALL 35.1 is

interpreted as CALL 35.10000, which causes a jump to label N10000 of program 35. CALL

47.123 causes a jump to label N12300 of program 47.

If letters and data (e.g. X1000) follow the CALL{data}, these can be arguments to be passed to the

subprogram. If arguments are to be passed, the first line executed in the subroutine should be a READ

statement. This statement will take the values associated with the specified letters and place them in the

appropriate Q-variable. For instance, the data following A is placed in variable Q101 for the coordinate

system executing the program; that following B is placed in Q102; and so on, to the data following Z

being placed in Q126. The subprogram can then use these variables. If the subprogram calls another

subprogram with arguments, the same Q-variables are used. Refer to READ for more details.

If there is no READ statement in the subroutine, or if not all the letter values in the CALL line are “read”

(the READ statement stops as soon as it sees a letter in the calling line that is not in its list of letters to

read), the remaining letter commands are executed upon return from the subroutine according to their

normal function. For example, G01 X10 Y10 is equivalent to a CALL 1000.01 X10 Y10. To

implement the normal function for G01 (linear move mode), there would be the following subroutine in

PROG 1000:

N1000 LINEAR RETURN

Upon the return, X10 Y10 would be executed as a move according to the move mode in force, which is

LINEAR.

If the specified program and line label do not exist, the CALL command is ignored, and the program

continues as if it were not there.

Examples:

CALL500 ; to Prog 500 at the top (N0)

CALL500.1 ; to Prog 500 label N10000

CALL500.12 ; to Prog 500 label N12000

CALL500.123 ; to Prog 500 label N12300

CALL500.1234 ; to Prog 500 label N12340

CALL500.12345 ; to Prog 500 label N12345

CALL700 D10 E20 ; to Prog 700 passing D and E