Siemens SINUMERIK 840D sl Operating Manual page 576

Multi-channel support
10.7 Synchronizing a counterspindle
Parameters
Function, withdrawing
Also take zero point
Zero offset
Z1
F
Parameters
Function, rear face
Zero offset
ZW
ZV
Parameters
Function, front face
Zero offset
576
Description
Also take zero point
Yes

No

Zero offset in which the coordinate system offset by Z1 must be saved.
Basic reference

G54

G55

G56

G57

...

Amount by which the workpiece is withdrawn from the main spindle (inc)
Feedrate
Description
Zero offset in which the coordinate system, which was shifted according to ZW
and by ZV as well as mirrored in Z, must be saved:
Basic reference

G54

G55

G56

G57

...

Machining position for special axis (abs.); machine coordinate system
Offset Z = 0
Workpiece zero is offset in Z direction (inc, the sign is also evaluated)
Description
Zero offset for machining the next front face:
Basic reference

G54

G55

G56

G57

...

Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Unit
mm/min
Unit
mm
mm
Unit
Turning