Siemens SINUMERIK 840D sl Programming Manual page 691

Example: Program sequence for axis replacement, two channels
The Z axis has been declared in the first and second channels.
Program sequence in the first channel:
Program code
WHEN TRUE DO RELEASE(Z)
WHENEVER($AA_TYP[Z]==1) DO RDISABLE
N110 G4 F0.1
WHEN TRUE DO GET(Z)
WHENEVER($AA_TYP[Z]<>1) DO RDISABLE
N120 G4 F0.1
WHEN TRUE DO RELEASE(Z)
WHENEVER($AA_TYP[Z]==1) DO RDISABLE
N130 G4 F0.1
N140 START(2)
Program sequence in the second channel:
Program code
WHEN TRUE DO GET(Z)
WHENEVER($AA_TYP[Z]==0) DO RDISABLE
N210 G4 F0.1
WHEN TRUE DO GET(Z)
WHENEVER($AA_TYP[Z]<>1) DO RDISABLE
N220 G4 F0.1
WHEN TRUE DO RELEASE(Z)
WHENEVER($AA_TYP[Z]==1) DO RDISABLE
N230 G4 F0.1
N250 WAITM(10, 1, 2)
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
Motion synchronous actions
10.4 Actions in synchronized actions
Comments
; Z axis becomes the neutral axis
; Read-in inhibit as long as Z axis
is program axis
; Z axis again becomes the NC
program axis
; Read-in inhibit until Z axis is
the program axis
; Z axis becomes the neutral axis
; Read-in inhibit as long as Z axis
is the program axis
;
; Start the second channel
Comments
; ;Move Z axis to second channel
; ;Read-in disable as long as Z
axis is in other channel
;
; ;Z axis is NC program axis
; ;Read-in disable until Z axis is
program axis
; ;Z axis in second channel is
neutral axis
; ;Read-in disable as long as Z
axis is program axis
; Synchronize with channel 1
691