Indexed Axes/"Hirth" Axes - Siemens SINUMERIK 840D sl Commissioning Manual

10.5.6

Indexed axes/"Hirth" axes

Indexed axes are rotary or linear axes, which can be traversed to indexed positions by index
program instructions.
These indexed positions are approached in JOG mode.
In "normal" positioning, every position can be approached.
Note
Traversing to indexing positions using the parts program or manually is only effective if the
corresponding machine axis has been successfully referenced.
Hirth axes are indexing axes with Hirth tooth system. These axes are rotary or linear axes,
which may only be traversed to defined positions, the indexing positions, within the
traversing range (MD30505 HIRTH_IS_ACTIVE).
The indexing positions are stored in tables.
Indexing axis
Machine data
● MD30500 INDEX_AX_ASSIGN_POS_TAB[n] (axis is indexing axis)
assigns the machine axis the relevant table of indexing positions and also defines the
machine axis as an indexing axis.
Indexing position tables
The indexing positions are stored in one of two possible tables.
● MD10900 INDEX_AX_LENGTH_POS_TAB_1 (number of positions of indexing table 1)
● MD10910 INDEX_AX_POS_TAB_1[n] (indexing position table 1)
● MD10920 INDEX_AX_LENGTH_POS_TAB_2 (number of positions of indexing table 2)
● MD10930 INDEX_AX_POS_TAB_2[n] (indexing position table 2)
Machine data
Table 10-18 Indexing axes: Machine data
Number Identifier
general ($MN_ ... )
10260 CONVERT_SCALING_SYSTEM
10270 POS_TAB_SCALING_SYSTEM
10900 INDEX_AX_LENGTH_POS_TAB_1
10910 INDEX_AX_POS_TAB_1[n]
10920 INDEX_AX_LENGTH_POS_TAB_2
10930 INDEX_AX_POS_TAB_2[n]
Axis/spindlespecific ($MA_ ... )
IBN CNC: NCK, PLC, drive
Commissioning Manual, 07/2007, 6FC5397-2AP10-3BA0
Name
Basic system switch-over active
Measuring system of position tables
Number of indexing positions used in Table 1
Indexing position table 1
Number of indexing positions used in Table 2
Indexing position table 2
NCK start-up
10.5 Parameterize axis data
Reference
G2
137