01/2007
11.5 Axes and spindles
11-333
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
11.5.12 Indexing axes
Indexing axis are rotary or linear axes that may only be traversed within their
traversing range to defined positions, the indexing positions.
Traversing to indexing positions using the part program or manually is only ef-
fective if the corresponding machine axis has been successfully referenced.
The indexing positions are stored in tables.
Machine data
S MD30500: INDEX_AX_ASSIGN_POS_TAB[n] (axis is indexing axis)
assigns the machine axis the relevant table of indexing positions and also de-
fines the machine axis as an indexing axis.
The indexing positions are stored in one of 2 possible tables.
S MD10900: INDEX_AX_LENGTH_POS_TAB_1 (number of positions of
indexing table 1)
S MD10910: INDEX_AX_POS_TAB_1[n] (indexing position table 1)
S MD10920: INDEX_AX_LENGTH_POS_TAB_2 (number of positions of
indexing table 2)
S MD10930: INDEX_AX_POS_TAB_2[n] (indexing position table 2)
Table 11-30 Indexing axes: Machine data
Number
Identifier Name Refer-
ence
General ($MN_ ... )
10260 CONVERT_SCALING_SYSTEM Basic system switch–over active G2
10270 POS_TAB_SCALING_SYSTEM Measuring system of position tables
10900 INDEX_AX_LENGTH_POS_TAB_1 Number of indexing positions used in Table 1
10910 INDEX_AX_POS_TAB_1[n] Indexing position table 1
10920 INDEX_AX_LENGTH_POS_TAB_2 Number of indexing positions used in Table 2
10930 INDEX_AX_POS_TAB_2[n] Indexing position table 2
Axis/spindle–specific ($MA_ ... )
30300 IS_ROT_AX Rotary axis R2
30310 ROT_IS_MODULO Modulo conversion for rotary axis R2
30320 DISPLAY_IS_MODULO Position display modulo 360
o
R2
30500 INDEX_AX_ASSIGN_POS_TAB Axis is indexing axis
30501 INDEX_AX_NUMERATOR Numerator for indexing axes with equidistant positions
Indexing axis
Indexing position
tables
Machine data
11 NCK Commissionin
with HMI Advanced
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