Siemens SINUMERIK 840D sl Function Manual page 990

Indexing Axes (T1)
Examples
16.8 Examples
16.8.1 Examples of equidistant indexes
Modulo rotary axis
MD30502 $MA_INDEX_AX_DENOMINATOR[AX4] =18
MD30503 $MA_INDEX_AX_OFFSET[AX4]=5
MD30500 $MA_INDEX_AX_ASSIGN_POS_TAB[AX4] = 3
MD30300 $MA_IS_ROT_AX[AX4] = TRUE
MD30310 $MA_ROT_IS_MODULO[AX4] = TRUE
With the machine data above, axis 4 is defined as a modulo rotary axis and an indexing axis
with equidistant positions every 20° starting at 5°.
The following indexing positions result:
5, 25, 45, 65, 85, 105, 125, 145, 165, 185, 205, 225, 245, 265, 285, 305, 325 and 245
degrees.
Note
The assignment:
MD30502 $MA__INDEX_AX_DENOMINATOR[AX4] =18
produces a 20° division because the default for machine data:
MD30330 $MA_MODULO_RANGE
is 360°.
Rotary axis
MD30501 $MA_INDEX_AX_NUMERATOR[AX4] = 360
MD30502 $MA_INDEX_AX_DENOMINATOR[AX4] =18
MD30503 $MA_INDEX_AX_OFFSET[AX4]=100
MD30500 $MA_INDEX_AX_ASSIGN_POS_TAB[AX4] = 3
MD30300 $MA_IS_ROT_AX[AX4] = TRUE
MD36100 $MA_POS_LIMIT_MINUS[AX1]=100
MD36110 $MA_POS_LIMIT_PLUS[AX1]=260
With the machine data above, axis 4 is defined as a rotary axis and an indexing axis with
equidistant positions every 20° starting at 100°.
The following indexing positions result:
100°, 120°, 140° etc.
Positions less than 100° cannot be approached as indexing positions.
It is advisable to place the lower software limit switch in this case. The indexing positions
continue until the software limit switch is reached (in this case 260°). The rotary axis can
therefore only traverse between 100° and 260°.
990
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions