Function-Specific Boundary Conditions - Siemens SINUMERIK 840D sl Function Manual

TE1: Clearance control
11.9 Boundary conditions
11.9.2

Function-specific boundary conditions

NC stop from PLC
If, in addition to the programmed path motion, the traversing movement of the clearance-
controlled axes is also to be stopped in connection with an NC stop, the "NC stop axes and
spindles" interface signal must also be set in addition to the "NC stop" interface signal:
• DB21, ... DBX7.3 (NC stop)
• DB21, ... DBX7.4 (NC stop axes and spindles)
Follow­up
If a clearance-controlled axis is to be switched as an alarm response or via the corresponding
interface signal from the PLC in "follow-up" mode, setpoint output will cease for clearance
control on this axis.
Travel without software limit switches
If the clearance-controlled axes are to travel without referencing (travel without software limit
switches), values outside the traversing range used must be entered in the corresponding
machine data for the axis-specific software limit switches:
• MD36100 $MA_POS_LIMIT_MINUS (1st software limit switch minus)
• MD36110 $MA_POS_LIMIT_PLUS (1st software limit switch plus)
• MD36120 $MA_POS_LIMIT_MINUS2 (2nd software limit switch minus)
• MD36130 $MA_POS_LIMIT_PLUS2 (2nd software limit switch plus)
Clearance control takes the machine data into account even if an axis is not being referenced.
Disabling digital/ analog inputs
Neither the analog input for the input voltage of the clearance sensor nor the digital input used
by the clearance control in the context of the "Lift fast with position controller cycle" special
function can be controlled (disabled) via the PLC:
DB10, DBB0 (Disable digital NCK inputs)
DB10, DBB146 (Disable analog NCK inputs)
See also the description of machine data:
• MD62508 $MC_CLC_SPECIAL_FEATURE_MASK, bit 4 and 5 (Special functions and
operating modes of the clearance control)
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Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions