Siemens SINUMERIK 840D Function Manual

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17.9.3 ProgrammingSystem variablesThe following system variables that can be read in the part program and in the synchronousactions for the "Approach fixed point" function.System variable Description$AA_FIX_POINT_SELECTED [] Number of fixed point to be approached$AA_FIX_POINT_ACT [] Number of the fixed point on which the axis is cur‐rently located17.9.4 Supplementary ConditionsAxis is indexing axisThe axis is not traversed and an alarm is output if the axis to be traversed is an indexing axisand the fixed point position to be approached does not match an indexing position.Frames activeAll active frames are ignored. Traversing is performed in the machine coordinate system.Offset values activeActive offset values (DRF, external zero offset, synchronized action offset $AA_OFF, onlinetool offset) are also traversed. The fixed point is a position in the machine coordinates system.An alarm is issued if an offset movement (DRF, external zero offset, synchronized action offset$AA_OFF, online tool offset) is made during a fixed point approach in JOG. The position of thefixed point to be approached in the machine coordinates system is not reached; instead aposition that would have been reached without active offset movement is reached. The NC/PLC interface signal DB31, ... DBX75.3-5 corresponding to the fixed point is not output.Working-area limitationsWorking-area limitations (in BCS and WCS) are considered and the axis motion is stopped onreaching the limits.H1: Manual traversing17.9 Approaching a fixed point in JOGAxes and spindles676 Function Manual, 06/2019, A5E47437747B AA