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Free Point |
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This element is provided in case a machine would carry out a movement which is not composed of simple linear movements, e.g. a circle movement. Because it is easier to write we call it free point. You can define each of the three coordinates of the free point by the PLC. Therefore you have to write a function block, which calculates the required movement.
For each of the three space directions the free point provides a DInt, in which you have to deposit the position of the chosen units for the system (standard: mm) on part of the PLC.
If you calculate the position not as DInt, but as INT, you have to take care that the value will not become negative. Otherwise you have to convert it to the DInt-format by the instruction ITD.
Tabsheet: Actuators |