Reference Manual

PMAC 2 Software Reference

344 PMAC Program Command Specification

V Q122 21 2,097,15 $200000

W Q123 22 4,194,304 $400000

X Q124 23 8,388,608 $800000

Y Q125 24 16,777,216 $1000000

Z Q126 25 33,554,432 $2000000

*Cannot be used

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). 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.

If the READ function encounters a letter in the calling line that is not in the list of letters

to be read, the reading action stops, even if there are other letters from the list still to be

read on the calling line. For example, if the calling line were CALL100 X10 Y20

Z30, and PROG 100 started with a READ(X,Z), the X-value would be read

successfully, but not the Z-value.

Example

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

G04 X2000, for instance. In 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 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