Reference point approach
Siemens AG, 2004. All rights reserved.
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 Edition
After the system is switched on the actual value display will not
correspond to the actual positions of the axes. The Ref function
(reference point approach) is used to synchronize the control and the
• the Control Panel Function key and
• the REF softkey
the following working window appears ( = startup window after
booting, see Section "Start-up"):
Reference Point Approach working window
In addition, the following symbols may also appear next to the axes:
• Reference point approach already performed for this axis.
• Reference point approach yet to be performed for this axis.
• Reference point approach does not need to be performed for
The User Agreement sub menu only appears if the Safety Integrated
option is selected and at least one axis is present which needs to be
Manual Mode – Operating Area Machine
5.3 Reference point approach