Siemens SINUMERIK 840D sl Function Manual page 947

Valid measuring system
The indexing positions defined with MD10900 and MD10920 are related to the measuring
system configured for position tables:
MD10270 $MN_POS_TAB_SCALING_SYSTEM
Value
0
1
Note
MD10270 has an effect on the following setting data:
SD41500 $SN_SW_CAM_MINUS_POS_TAB_1 (switching point for falling cam edge 1-8)
to
SD41507 $SN_SW_CAM_PLUS_POS_TAB_4 (switching point for rising cam edge 25-32)
Entry for indexing positions
The following rules apply:
● The indexing positions must be entered in the table in ascending order (starting with the
● Consecutive position values cannot be identical.
● The axis positions must be entered in the basic coordinate system.
Modulo rotary axis as indexing axis
The indexing axis is defined with Modulo 360° as rotary axis:
MD30300 $MA_IS_ROT_AX = 1
and
MD30310 $MA_ROT_IS_MODULO = 1
In this case, the following points must be observed additionally for the specification of the
indexing positions:
● Permissible range: 0° ≤ Pos < 360°
● Since the indexing axis is defined as a continuously rotating rotary axis, indexing position
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Measuring system
Metric
inch
negative to the positive traversing range) with no gaps between the entries.
1 is approached after the highest valid indexing position in the table has been reached
and the axis continues to traverse in the positive direction with INC. Similarly, indexing
position 1 is followed by the highest valid indexing position in the negative direction with
INC.
T1: Indexing axes
16.3 Parameterization of indexing axes
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