Siemens SINUMERIK 840D Function Manual

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COUPOF during the motionIf synchronous mode is deselected while the spindles are in motion with COUPOF, the followingspindle continues to rotate at the current speed (nFS). The current speed can be read withsystem variable $AA_S in the NC parts program.The following spindle can then be stopped from the parts program with M05, SPOS, SPOSA orfrom the PLC with the appropriate interface signal.COUPOFS with stop of following spindleOpening a synchronous spindle coupling is extended by a stop of the following spindle:● Deactivating a coupling as quickly as possible and opening a coupling as quickly aspossible.The block change is then enabled.COUPOFS(FS, LS)● Opening the coupling with stop of following spindle at the programmed position. The blockchange is then enabled.Boundary condition:COUPOFS(FS, LS) and COUPOFS(FS, LS, POSFS) have no meaning if a coupling was active.19.1.6 Controlling synchronous spindle coupling via PLCControlling following spindle via PLCUsing the coupling-specific, axial VDI interface signals, it is possible to control synchronizationmotions for the following spindle from the PLC program. This offers the option of utilizing thePLC to disable, suppress or restore a synchronization motion for the following spindle specifiedby offset programming.These signals have no effect on the leading spindle. The following coupling-specific VDI signal(PLC → NC) is available:IS "Disable synchronization" (DB31, ... DBX31.5)"Disable synchronization"The synchronization motion for the following spindle is suppressed using the axial signal IS"Disable synchronization" (DB31, ... DBX31.5).When the main run advances to a block containing part program instruction COUPON (FS, LS,offset), the following interface signal is evaluated for the following spindle:S3: Synchronous spindle19.1 Brief descriptionAxes and spindlesFunction Manual, 06/2019, A5E47437747B AA 859