Siemens sinumerik 840D sl Function Manual

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Detailed description2.2 Using tangential follow-up controlSpecial functions: Tangential Control (T3)Function Manual, 11/2006, 6FC5397-2BP10-2BA0 112.2.2 Activation of follow-up controlProgrammingThe programming is carried out using the pre-defined sub-program TANGON. When thetangential control is activated, the name of the following axis which must be made to follow istransferred to the control. This specification refers to the assignment between master andfollowing axes made beforehand with TANG. Refer to Section "Assignment between leadingaxes and following axis". An angle between the tangent and the position of the following axiscan be specified optionally when follow-up is activated. This angle is maintained by thecontrol for as long as the following axis is made to follow. The angle is added to the anglestored in the following machine data:MD37402 $MA_TANG_OFFSET (preselection angle for tangential follow-up)If the angle is zero both in TANGON and in the MD, the following axis takes the direction ofthe tangent.&;<Figure 2-2 Tangential control, offset angle of 90 degrees to path tangentActivation is programmed as follows for the above example and an offset angle of 90degrees:TANGON(C, 90)In response to every motion in path axes X and Y, following axis C is rotated to an angle of90 degrees in the relation to the path tangent.