Siemens SINUMERIK 840D sl Function Manual page 475

1D/ 3D clearance control
The following machine data is used to select 1D or 3D clearance control:
• MD62500 $MC_CLC_AXNO = x (axis assignment for clearance control)
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Input signals
The clearance sensor input signals parameterized above:
• 840D: Chapter "Parameter settings for input signals (840D) [Page 471]"
• 840Di: Chapter "Parameter settings for input signals (840Di) [Page 472]"
are declared to the clearance control function via the following machine data:
• MD62502 $MN_CLC_ANALOG_IN = x (analog input for clearance control)
x =input number, as when addressing system variables $A_INA[x]
• MD62504 $MN_CLC_SENSOR_TOUCHED_INPUT = x (assignment of the input bit for the
"sensor collision" signal)
x =input number, as when addressing system variables $A_IN[x]
Exact stop
In order to be able to meet a programmed "Exact stop coarse/fine reached" block change
condition (G601/G602), the traversing velocity induced by the clearance control function in
the clearance-controlled axes must be lower than the standstill velocity tolerance at least for
the duration of the standstill delay time.
The following machine data must be modified to optimize the block change time:
• MD36000 $MA_STOP_LIMIT_COARSE[x] (exact stop coarse)
• MD36010 $MA_STOP_LIMIT_FINE[x] (exact stop fine)
• MD36020 $MA_POSITIONING_TIME [x] (delay time exact stop fine)
• MD36040 $MA_STANDSTILL_DELAY_TIME[x] (standstill monitoring time delay)
• MD36060 $MA_STANDSTILL_VELO_TOL[x] (high velocity/ speed "axis/ spindle
stopped")
x = Axis number of clearance-controlled machine axis
Complete parameterization
Set the remaining clearance control parameters in accordance with the data and signal
descriptions in the sections of the same name.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
x > 0: 1D clearance control where x = axis number of clearance-controlled channel axis
x = -1: 1. 5-axis transformation configured in channel
x = -2: 2. 5-axis transformation configured in channel
TE1: Clearance control
11.5 Startup
475