Siemens SINUMERIK 840C - Manual (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
0
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
0
0
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SINUMERIK 840C (IA)