Siemens SINUMERIK 840C Installation Instructions Manual page 344

09.95
1108*
Default value
0
Note:
The rotary axis has a defaulted internal reference dimension of 360 degrees in accordance
with the input resolution. No input is necessary.
When using the function in conjuction with chain-type magazines it may be necessary for the
rotary axis to perform several revolutions to arrive at one magazine revolution.
The division reference in this case will still be 360°. Adjustment of either the rotary axis or the
chain-type magazine can be carried out by variable increment weighting.
1112*
Default value
0
Remarks regarding the action of machine data:
If the use of the function is dependent on the workpiece, the machine data are changed while
the workpiece is being machined and in setup mode. This can be done by:
• MD modification from the PLC
• MD modification via configuration
• MD modification via CL 800
The machine data can be configured in such a way that they can be changed without start up
mode. They take effect immediately after change without, for instance, Warm restart or Reset
having to be performed.
If, for instance, the division machine data are changed while a division processing operation is
in progress, they will take effect after about only 100 ms.
Traversing an indexing axis to the reference point
If the function is used on a machine-specific basis, the indexing axis can be traversed to a
division-specific reference point. The MD "Reference point offset" can be used to specify the
distance of the zero mark to an indexing position. The indexing axis need not be traversed to
an indexing position using the reference point. The next traverse of the axis after reference
point approach is automatically a movement to an indexing position.
Example:
Linear axis: Number of divisions
Division reference dimension
Reference point
Reference point offset
µm
140,000 µm
illegal
area
2
1
©
Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
Division reference dimension
Lower input limit
0
Division dimension offset
Lower input limit
- 999 9999
=
=
= 140,000 µm;
= 0;
3 4 5
6FC5197- AA50
6.7 Axis-specific MD 2 (axial data 2)
Upper input limit
99 999 999 units (MS)
Upper input limit
99 999 99 units (IS)
5
200,000 µm
200,000 µm
6
Active
at once
Units
Activ
see below
Units
6–159