HEIDENHAIN TNC 620 (81760x-02) ISO programming - Manual (Page 410)

Programming: Multiple axis machining
12.2 The PLANE function: Tilting the working plane (software option 8)
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TNC 620 | User's ManualDIN/ISO Programming | 2/2015
Selection of alternate tilting possibilities: SEQ +/– (entry
optional)
The position you define for the working plane is used by the TNC to
calculate the appropriate positioning of the rotary axes present on
the machine. In general there are always two solution possibilities.
Use the
SEQ switch to specify which possibility the TNC should
use:
SEQ+ positions the master axis so that it assumes a positive
angle. The master axis is the 1st rotary axis from the tool, or
the last rotary axis from the table (depending on the machine
configuration (see figure at top right)).
SEQ– positions the master axis so that it assumes a negative
angle.
If the solution you chose with SEQ is not within the machine’s
range of traverse, the TNC displays the Entered angle not
permitted error message.
When the PLANE AXIS function is used, the SEQ
switch is nonfunctional.
If you do not define SEQ, the TNC determines the solution as
follows:
1 The TNC first checks whether both solution possibilities are
within the traverse range of the rotary axes.
2 If they are, then the TNC selects the shortest possible solution.
3 If only one solution is within the traverse range, the TNC selects
this solution
4 If neither solution is within the traverse range, the TNC displays
the Entered angle not permitted error message.