Reference Manual

Turbo PMAC/PMAC2 Software Reference

Turbo PMAC Program Command Specification 467

Any letter may be READ except N or O, which are reserved for line labels (and should only be at the

beginning of a line anyway). If a letter value is read from the calling line, the normal function of the

letter (e.g. an axis move) is overridden, so that letter serves merely to pass a parameter to the subroutine.

If there are remaining letter values on the calling line that are not read, those will be executed according

to their normal function after the return from the subroutine.

Examples:

In standard machine tool code, a two-second DWELL would be commanded in the program as a G04

X2000, for instance. In Turbo PMAC, a G04 is interpreted as a CALL to label N04000 of PROG 1000,

so to implement this function properly, PROG 1000 would contain the following code:

N04000 READ(X)

DWELL (Q124)

RETURN

Also, in standard machine tool code, the value assigned to the current position of the axis may be changed

with the G92 code, followed by the letters and the new assigned values of any axes (e.g. G92 X20

Y30). It is important only to assign new values to axes specified in this particular G92 command, so the

Turbo PMAC subroutine implementing G92 with the PSET command must check to see if that particular

axis is specified:

N92000 READ(X,Y,Z)

IF (Q100 & $800000 > 0) PSET X(Q124)

IF (Q100 & $1000000 > 0) PSET Y(Q125)

IF (Q100 & $2000000 > 0) PSET Z(Q126)

RETURN