Siemens SINUMERIK 840D sl Operating Manual page 85

Coarse and fine offsets
Every zero offset (G54 to G57, G505 to G599) consists of a coarse offset and a fine offset.
You can call the zero offsets from any program (coarse and fine offsets are added together).
You can save the workpiece zero, for example, in the coarse offset, and then store the offset
that occurs when a new workpiece is clamped between the old and the new workpiece zero
in the fine offset.
Note
Deselect fine offset
You have the option of deselecting the fine offset via machine data
$MN_MM_FRAM_FINE_TRANS
See also
Actual value window (Page 44)
Turning
Operating Manual, 02/2012, 6FC5398-8CP40-3BA0
Setting up the machine
2.7 Zero offsets
85