Siemens SINUMERIK 840D sl Function Manual page 579

The voltage specification for the analog output $A_OUTA[6] used in the synchronized action
is subtracted from the clearance sensor input voltage by the clearance control function and
therefore has the opposite polarity to the input signal.
Set the following machine data to induce the clearance control function to use analog output
6 ($A_OUTA[6]) as an additional input overlaid on the sensor input:
MD10366 $MN_CLC_OFFSET_ASSIGN_ANAOUT = 6 (hardware assignment for the external
digital NCK inputs)
Note
Before the clearance control function is activated for the first time, check that the entire working
range enabled for clearance control is collision-free:
● MD62505 $MC_CLC_SENSOR_LOWER_LIMIT (lower clearance control motion limit)
● MD62506 $MC_CLC_SENSOR_UPPER_LIMIT (upper clearance control motion limit)
An incorrect control direction can be corrected using one of the following methods:
● Reversing the polarity of the analog input
● Changing the sign of all values in the following machine data:
– MD62511 $MC_CLC_SENSOR_VELO_TABLE_1 (coordinate velocity of interpolation
– MD62513 $MC_CLC_SENSOR_VELO_TABLE_2 (coordinate velocity of interpolation
Sensor signal
Signal quality
The quality of the analog input signal can be checked using the function-specific display data
(see Section "Function-specific display data (Page 593)").
Input voltage range
The input voltage range for the measuring signal of the sensor can be adapted using the
machine data for the weighting factor for the analog NCK inputs:
MD10320 $MN_FASTIO_ANA_INPUT_WEIGHT[<analog input>] = <weighting factor>
The following machine data must be set in order that the weighting factor from the clearance
control function is included in the calculation:
MD62508 $MC_CLC_SPECIAL_FEATURE_MASK, Bit 13 = 1
Function-specific alarm texts
Function-specific alarm texts must first be integrated into the appropriate HMI data
management before they can be displayed (see Section "Creating alarm texts (Page 555)").
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
points sensor characteristic 1)
points sensor characteristic 2)
TE1: Clearance control - 840D sl only
15.5 Startup
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