Siemens sinumerik 840D sl Function Manual page 536

Compensation vector
Actual position of the direction axes
If the clearance control is activated with a programmable compensation vector at a position
of 0 on all 3 direction axes, a compensation vector cannot be calculated from this
information. The following alarm is then displayed:
• Alarm "75019 Channel
Referencing of the direction axes
The direction axes must be referenced before clearance control is activated with
programmable compensation vector CLC(3).
Interface signals of the direction axes
The following interface signals must be set for all 3 direction axes by the PLC user program,
before clearance control is activated with programmable compensation vector CLC(3).
• DBX31, ... DBX1.5 = 1 (position measuring system 1)
• DBX31, ... DBX2.1 = 1 (servo enable)
• DBX31, ... DBX21.7 = 1 (pulse enable)
Switchover of clearance control
Direct switchover of clearance control from CLC(1) or CLC(2) to CLC(3) or vice-versa is not
possible. Such switchovers are ignored without a checkback message. If a switchover is
necessary, the clearance control must first be deactivated with CLC(0) or CLC(-1) and then
activated in the desired mode.
Interpolation of the compensation vector
If the compensation vector is required to follow a non-linear workpiece surface, such as an
arc, with respect to its orientation, this can be achieved by programming the direction axes.
Example
Orientation of the compensation vector perpendicular to a semi-circular workpiece surface.
The programming of the traversing movement is not considered.
Special functions: Clearance Control (TE1)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
x = axle number
number
, error ID: 1, angle 0.0"
Detailed description
2.6 Programming
31