Zeros And Reference Points; Reference Points In Working Space - Siemens SINUMERIK 840D sl Function Manual

K2: Axis Types, Coordinate Systems, Frames

10.3 Zeros and reference points

References:
Function Manual, Extended Functions; Several Operator Panels on Multiple NCUs, Distributed
Systems (B3)
10.3 Zeros and reference points
10.3.1

Reference points in working space

Zeros and reference points
The neutral position of the machine is obtained from the coordinate axes and the constructive
characteristics of the machine. The zero of the coordinate system is obtained by defining a
suitable reference point on the machine in its neutral position.
The position of the coordinate systems (MCS, BCS, BZS, SZS, WCS) is determined by means
of zeros.
Zero points
Machine zero M
The machine zero M defines the machine coordinate system MCS. All other reference points
refer to the machine zero.
Workpiece zero W
The workpiece zero W defines the workpiece coordinate system in relation to the machine
zero M. The programmed part-program blocks are executed in the workpiece coordinate
system WCS.
Reference point R
The position of the reference point R is defined by cam switches. Reference point R calibrates
the position measuring system.
With incremental encoders, the reference point must be approached every time the control
power is switched on. The control can only then work with the measuring system and transfer
all position values to the coordinate systems.
678
M = Machine zero
W = Workpiece zero
Reference points
R = Reference point
T = Toolholder reference point
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions