Siemens SINUMERIK 840C - Page 737

11.92 10 Axis and Spindle Installation
10.4.5 Distance-coded reference marks
3040 mm
n = = 152
1000
.
0.02 mm
The following correlation is used for calculating the absolute offset:
Position in machine system = Absolute offset +/- absolute position in scale system
(x
MA
) (x
LA
)
or
Absolute offset = Position in machine system -/+ absolute position in scale system
(x
MA
) (x
LA
)
+: Machine scale and linear scale in same direction
(MD 1808*, bit 2=0)
x
LA
x
MA
Scale system
Machine system
Absolute value
offset
a a a
a
a
a
a
a
a
a a a
0
a a a
a
a
a
a
a
a
a
a
a
a a a
0
Direction of movement
-: Machine and linear scale in opposite directions
(MD 1808*, bit 2=1)
x
LA
x
MA
Absolute value offset
Direction of movement
a a a
a
a
a
a
a
a
a a a
0
a a
a a
a a
a a
0
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 10–47
SINUMERIK 840C (IA)