Siemens SINUMERIK 840C - Manual (Page 228)

10.94 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.4 Axis-specific MD 1 (axial data 1)
Reference point value 240*
Default value Lower input limit Upper input limit Units
0 ±0 99 999 999 units (MS)
Active on
NC Stop
The difference between absolute machine zero and the fixed reference point is entered for the
respective axis. These values are set as actual values for reference point approach (also refer
to Section entitled ”Axis (Analog) and Spindle Installation” for a detailed description of
reference point approach).
Example: Turning machine
Z+
Workholder
ZMR
X+
R
XMR
W
Workpiece
M
M ... Machine zero
W ... Workpiece zero
R ... Reference point
XMR ... Reference point coordinate in X direction
ZMR ... Reference point coordinate in Z direction
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 6–43
SINUMERIK 840C (IA)