Siemens SINUMERIK 840C - Manual (Page 887)

12 Functional Descriptions 06.93
12.13.8 PLC user interface
12.13.8 PLC user interface
The parameters for the command channel can be set via two interfaces:
a) User interface UI in the permenantly set data block DB 41
b) Any DB or DX set by the user in which the parameters for the function triggered in the NC
are entered.
The user must enter function number 2 in DB 41 for the function ”Indexing function from
PLC”.
12.13.9 Conditions for the function ”Setup mode division related”
• DRF function
With the DRF function the position of an indexing axis is altered but not the display actual
value.
• PRESET offset
With PRESET offset, the display actual value of the indexing axis is set to a new value.
The PRESET value, however, cannot be entered division related. It must be entered as
usual as an absolute value or modulo 360 degrees.
• Handwheel
The handwheel is used to traverse the indexing axis across geometry resolutions in the
same way as the normal axes (i.e. no divisions).
• Zero offsets, tool offsets
Zero offsets and tool offsets have no effect on an indexing axis.
• Coupled motion
Prerequisite: Coupled motion is selected and active
1.) Main axis as indexing axis
The coupled motion axes are traversed with the main axis.
2.) Coupled motion axis as indexing axis
The coupled motion axes are not traversed. Travel is aborted at an indexing position or
travel is not activated.
• Coordinate transformation
Prerequisite: Transformation is selected and active
1.) Fictitious axis as indexing axis
The indexing axis is transformed and traversed in the same way as a real axis.
2.) Real axis as indexing axis
The real axis is not traversed. Travel is aborted at an indexing position or travel is not
activated.
• Linear axes have no ”Modulo number of divisions”
Ratio as for rotary axes. Their indexing position is always displayed in absolute values,
linear axes cannot approach an indexing position which is < 1!
12–112 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)