Siemens SINUMERIK 840D sl Function Manual

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Case 1: The machine axis is positioned before the reference camAfter the start of reference point approach, the machine axis is accelerated in theparameterized direction and to the parameterized reference point approach velocity :● MD34010 $MA_REFP_CAM_DIR_IS_MINUS (approach reference point in minusdirection)● MD34020 $MA_REFP_VELO_SEARCH_CAM (reference point approach velocity)The reaching of the reference cam must detected by querying a digital input in the PLC userprogram and communicated to the NC via the following interface signal:DB31, ... DBX12.7 = 1 (reference point approach deceleration)With detection of the NC/PLC interface signal, the machine axis is decelerated to zero speed.Whereby at least the distance smin is traversed. This ensures that the machine axis leaves thereference cam in Phase 2 with the parameterized reference point creep velocity.60,1 0'0$B5()3B9(/2B6($5&+B0$5.(5 0'0$B0$;B$;B$&&(/Phase 1 is now complete. Reference point approach is continued with Phase 2.UHIHUHQFHSRLQWDSSURDFKYHORFLW\6WDUWLQJSRVLWLRQRIWKHPDFKLQHD[LVPLQGLVWDQFH5HIHUHQFHFDP9HORFLW\PD[LPXPGLVWDQFHWRUHIHUHQFHFDP=HURPDUN'LVWDQFH0'0$B5()3B0$;B&$0B',670'0$B5()3B9(/2B6($5&+B&$0Figure 15-4 Minimum distance for decelerationCase 2: The machine axis is positioned on the reference camThe machine axis remains at its starting position.Phase 1 is now complete. Reference point approach is continued with Phase 2.Case 3: The machine axis has no reference camMachine axes without reference cams remain at their starting position.These include, for example:● Machine axes that only have one zero mark along their entire traversing range● Rotary axes that only have one zero mark per revolutionZero must be entered in the following machine data for machine axes without a reference cam:MD34000 $MA_REFP_CAM_IS_ACTIVE = 0 (axis with reference cam)R1: Referencing15.5 Referencing with incremental measurement systemsBasic FunctionsFunction Manual, 01/2015, 6FC5397-0BP40-5BA2 1159