Siemens sinumerik 840D sl Function Manual page 444

Detailed description
2.1 Characteristics of tangential follow-up control
Task specification
Follow-up control for the rotary axis must be implemented so that the axis is always
positioned at a specified angle on the programmed path of the two leading axes.
Figure 2-1
In the diagram, X and Y are the leading axes in which the path is programmed; C is the
following axis whose position is determined by the control as a function of the leading axis
values and of the desired offset angle between tangent and alignment in C.
The tangential control will function only if the leading axes are used as path axes. A leading
axis which is programmed as a positioning axis (POS or POSA) does not specify values
required for the follow-up control function.
Special functions: Tangential Control (T3)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
Tangential control, offset angle of zero degrees to path tangent
2
7