Hirth Tooth System - Siemens SINUMERIK 840D sl Function Manual

Activating
The functions with equi-distant indexing for an axis (linear axis, modulo rotary axis or rotary
axis) is activated in the following settings
MD30500 $MA_INDEX_AX_ASSIGN_POS_TAB[axis] = 3
16.5.2

Hirth tooth system

Function
With Hirth tooth systems, positions of rotation on a rotary axis are usually interlocked using a
latch or other toothed wheel via a linear axis. The interlock should only be activated when an
indexing position has been reached precisely. The distance between the indexing positions
is the same (equidistant) across the entire circumference.
Requirements
The rotary axis must be an indexing axis. The axis must be referenced.
References:
/FB1/ Function Manual, Basic Functions; Reference Point Approach (R1)
Activation
The following machine data must be set to 1:
MD30505 $MA_HIRTH_IS_ACTIVE
The machine data must be set to 3 (equidistant indexing positions):
MD30500 $MA_INDEX_AX_ASSIGN_POS_TAB
Activation
● The rotary axis can only approach indexing positions in all modes and operating states.
● In JOG mode, the axis can be traversed under JOG control or incrementally.
● Jogging with the handwheel is not possible.
● Only "coded positions" can be approached in AUTO, MDA or via ASUBs.
● The PLC can only move the axis to indexing positions.
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Prerequisites: The axis is referenced.
References:
/FB2/ Function Manual, Extended Functions; Jog With/Without Handwheel (H1)
Indexing Axes (T1)
16.5 Equidistant index intervals
943