Signals From Channel (Db21 - Siemens SINUMERIK 840D sl Function Manual

Z3: NC/PLC interface signals
25.8 TE1: Clearance control
DB21, ...
DBX1.5
Edge evaluation: no
Signal state 1 or
edge change 0 → 1
Signal state 0 or
edge change 1 → 0
Application example
Corresponding to ....
25.8.2

Signals from channel (DB21, ...)

DB21, ...
DBX37.3
Edge evaluation: No
Signal state 1 or
edge change 0 → 1
Signal state 0 or
edge change 1 → 0
DB21, ...
DBX37.4
Edge evaluation: No
Signal state 1 or
edge change 0 → 1
Signal state 0 or
edge change 1 → 0
816
CLC_Override
Signal(s) updated: Cyclic
The channel-specific override DB21, ... DBB4 (feed rate override) also applies to the clearance
control
Override settings < 100% reduce corresponding to the velocity limitation for the overriding
motion, as defined in the following machine data:
MD62516 $MC_CLC_SENSOR_VELO_LIMIT (velocity of clearance control motion)
Override settings > 100% apply the limitation from the machine data.
The maximum velocity of the control motion is not dependent on the override setting
The difference for the operator is particularly dependent on whether the sensor motion is stop‐
ped or not with a 0 override.
channel-specific override settings:
DB21, ... DBB4 (feed rate override)
DB21, ... DBX6.7 (feed rate override active)
CLC is active
Signal(s) updated: Cyclic
Clearance control is activated.
Clearance control is deactivated.
CLC motion at lower motion limit
Signal(s) updated: Cyclic
The traversing movement of the clearance-controlled axes based on clearance control has
been stopped at the upper movement limit set in
MD62505 $MC_CLC_SENSOR_LOWER_LIMIT (lower clearance control motion limit)
or programmed with CLC_LIM(..).
Note:
The following signal is set at the same time:
DB21, ... DBX37.5 (CLC-stopped upper limit)
→ see "CLC motion has stopped" signal.
Clearance control has left the lower limitation.
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Special functions