Siemens SINUMERIK 840D Function Manual

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3.2.7 System variablesReference/actual stateThe reference and actual state of the "travel to fixed stop" function can be read using thefollowing system variables:● $AA_FXS = (status, "Travel to fixed stop" reference state)● $VA_FXS = (status, "Travel to fixed stop" actual state)ue>Description0 Axis is not at fixed stop1 Fixed stop was successfully approached2 Approach to fixed stop failed3 Selection "Travel to fixed stop" is active.4 Fixed stop was detected.5 Travel to fixed stop deselection activeAdditional informationIf errors occurred when traversing to the fixed stop ($VA_FXS == 2), then additional informationis displayed in the following system variables:● $VA_FXS_INFO = (additional information when "traveling to fixed stop")ue>Description0 No additional information available1 No approach motion programmed2 Programmed end position reached, motion stopped3 Cancellation using a reset, DB21, ... DBX7.7 == 14 Monitoring window was exited5 Torque reduction rejected by drive6 PLC has withdrawn the enable, DB31, ... DBX3.1 == 0 (travel to fixed stop enabled)Application example for $AA_FXSIn order that a block change is executed, no alarm should be triggered when a fault occurs. Thecause is then determined using the system variable $VA_FXS_INFO and a specific responseinitiated.Requirement: MD37050 $MA_FIXED_STOP_ALARM_MASK = 0 (when traveling to fixed stop,no alarm initiated)Program code CommentX300 Y500 F200 FXS[X1]=1 FXST[X1]=25 FXSW[X1]=5 ; Travel to fixed stopIF $AA_FXS[X1] == 2 GOTOF FXS_ERROR ; IF fixed stop == reachedF1: Travel to fixed stop3.2 Detailed descriptionAxes and spindlesFunction Manual, 06/2019, A5E47437747B AA 107