Starting Up Indexing Axes - Siemens SINUMERIK 840D sl Function Manual

16.6

Starting up indexing axes

16.6
Procedure
The procedure for starting up indexing axes is identical to normal NC axes (linear and rotary
axes).
Rotary axis
If the indexing axis is defined as a rotary axis (MD30300 $MA_IS_ROT_AX = "1") with
modulo 360° conversion (MD30310 $MA_ROT_IS_MODULO = "1"), indexing positions are
also approached with modulo 360
then be entered in the indexing position table. Otherwise alarm 4080 "Incorrect configuration
for indexing axis in MD [Name]" is output during power-up.
The position display can be set to modulo 360° with machine data:
MD30320 $MA_DISPLAY_IS_MODULO = 1.
Special machine data
The following machine data must be set in addition:
General machine data
MD10900 $MN_INDEX_AX_LENGTH_POS_TAB_1
MD10920 $MN_INDEX_AX_LENGTH_POS_TAB_2
MD10910 $MN_INDEX_AX_POS_TAB_1 [n]
MD10930 $MN_INDEX_AX_POS_TAB_2 [n]
Axial machine data
MD30500 $MA_INDEX_AX_ASSIGN_POS_TAB
MD30505 $MA_HIRTH_IS_ACTIVE
MD30501 INDEX_AX_NUMERATOR
MD30502 INDEX_AX_DENOMINATOR
MD30503 INDEX_AX_OFFSET
Machine data examples
The assignment of the above machine data is described in the following paragraphs using
two examples.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
. Only positions within the range from 0° to 359.999° can
o
Number of positions for indexing axis table 1
Number of positions for indexing axis table 2
Indexing position table 1
Indexing position table 2
Axis is indexing axis (assignment of indexing
position table 1 or 2, or 3 for equidistant
indexing)
Axis has "Hirth tooth system" property
Numerator for equidistant indexing
Denominator for equidistant indexing
Distance of 1st indexing position from zero
T1: Indexing axes
16.6 Starting up indexing axes
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