Siemens sinumerik 840D sl Function Manual

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Contents

Special functions: Contour Tunnel Monitoring (K6)Function Manual, 11/2006, 6FC5397-2BP10-2BA0 7Detailed description 22.1 Contour tunnel monitoringAim of the monitoring functionThe aim of the monitoring function is to stop the movement of the axes if axis deviationcauses the distance between the tool tip (actual value) and the programmed path (setpoint)to exceed a defined value (tunnel radius).Tunnel sizeThe radius of the contour tunnel being monitored around the programmed path must bedefined to implement the monitoring function.The radius is set in the machine data:MD21050 $MC_CONTOUR_TUNNEL_TOL (Response threshold for Contour tunnelmonitoring)If the machine data is set to 0.0, monitoring is not performed. The value of the machine datais transferred to the control for new configurations.Parameterizable deceleration behaviorThe deceleration behavior for the monitoring response can be set via the following machinedata:MD21060 $MC_CONTOUR_TUNNEL_REACTION(Reaction upon response of contour tunnel monitoring)Value Meaning0 Display alarm and continue machining1 Deceleration according to the deceleration ramps (default setting)2 Rapid stop (speed setpoint = 0)Encoder switchoverSwitching between two encoder systems usually causes a sudden change in the actualposition of the tool tip. This change resulting from encoder switchover must not be so largeas to cause the tool tip to violate the monitoring tunnel. The radius defined in MD21050 mustbe higher than the allowed tolerance on actual value switchover:MD36500 $MA_ENC_CHANGE_TOL (Tolerance on position actual value switchover)