Machine Operating Area
4.3 Reference point approach
The machine is synchronized as soon as the reference point is
reached. The actual value display is set to the reference point value.
The display is the difference between the machine zero and the slide
reference point. From now on path limits, such as software limit
switches, are active.
You can end the function by selecting another operating mode ("Jog",
"MDA" or "Automatic").
All axes of a mode group can approach the reference point
simultaneously (depending on the PLC program of the machine-
The feedrate override is active.
Your machine manufacturer will instruct you how to select axes if you
intend to enter more than nine.
The sequence in which axes must be referenced can be defined by
the machine-tool manufacturer.
The machine can be started in Automatic mode only when all axes
with a defined reference point (see machine data MD) have reached
SINUMERIK 840D/810D Operator's Guide HMI Embedded (BEM) – 03.04 Edition
Siemens AG, 2004. All rights reserved