Reference Point Approach With G Functions; Reference Point Approach With Intermediate Point (G28) - Siemens Sinumerik 840D sl Programming Manual

Drive commands

2.2 Reference point approach with G functions

2.2 Reference point approach with G functions
2.2.1

Reference point approach with intermediate point (G28)

Format
G28 X... Y... Z... ;
The commands "G28 X... Y... Z... ;" can be used to traverse the programmed axes to their
reference point. Here, the axes are first traversed to the specified position with rapid
traverse, and from there to the reference point automatically. The axes not programmed in
the block with G28 are not traversed to their reference point.
Reference position
When the machine has been powered up (where incremental position measuring systems
are used), all the axes must approach their reference mark. Only then can traversing
movements be programmed. The reference point can be approached in the NC program with
G28. The reference point coordinates are defined with the machine data 34100
$_MA_REFP_SET_POS[0] up to [3]). A total of four reference positions can be defined.
Figure 2-8
30
Automatic reference point approach
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling