Siemens SINUMERIK 840D sl Function Manual page 487

Functionality
The maximum control range for clearance control can be modified on a block-specific basis
using CLC_LIM. The maximum programmable lower/upper limit is limited by the limit value
preset in the relevant machine data:
• MD62505 $MC_CLC_SENSOR_LOWER_LIMIT[1] (lower clearance control motion limit)
• MD62506 $MC_CLC_SENSOR_UPPER_LIMIT[1] (upper clearance control motion limit)
Figure 11-13 Value range limits for lower and upper limit
The control range limit is effective in relation to the current programmed setpoint position of
the axis. If the limits are changed so that the actual position is located outside the limit, the
clearance control automatically effects travel back to the limit range.
Reset
Within a part program, a modified control range limit can be reset by explicitly programming
CLC_LIM without a "CLC_LIM( )" argument. This reapplies the limits from the following
machine data:
• MD62505 $MC_CLC_SENSOR_LOWER_LIMIT[0] (lower clearance control motion limit)
• MD62506 $MC_CLC_SENSOR_UPPER_LIMIT[0] (upper clearance control motion limit)
RESET response
The default setting from the above-mentioned machine data becomes effective after power
on reset, NC RESET and end of program.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
TE1: Clearance control
11.6 Programming
487