Siemens SINUMERIK 840D sl Function Manual page 679

Toolholder reference point T
The toolholder reference point T is located on the toolholder locator. By entering the tool
lengths, the control calculates the distance between the tool tip (TCP Tool Center Position)
and the toolholder reference point.
Example: Zeros and reference points on a turning machine
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K2: Axis Types, Coordinate Systems, Frames
10.3 Zeros and reference points
679