Siemens SINUMERIK 840D sl Function Manual page 143

Deactivation via NC/PLC interface signal
Only protection zones that have been preactivated via a part program and activated via the
NC/PLC interface signals, can be deactivated again via the NC/PLC interface signals:
● DB21, ... DBX8.0 to DBX9.1 = 0 (activate machine-related protection zone 1 - 10)
● DB21, ... DBX10.0 to DBX11.1 = 0 (activate channel-specific protection zone 1 - 10)
Protection zones that have been activated directly via a part program cannot be deactivated
from the PLC user program.
Note
It is recommended that protection zones which are to be activated via the PLC user program,
be configured specially for this. Preactivation in the part program is only useful for these
protection zones.
Automatic deactivation via machine data parameterization
When executing the Geometry axis change and Transformation change functions, the active
protection zones can be deactivated automatically. The setting is performed NC-specifically
via the machine data:
MD10618 $MN_PROTAREA_GEOAX_CHANGE_MODE
Bit
0
1
Display protection zone violation
Violations of activated protection zones or possible violations of preactivated protection zones,
if they would be activated, are displayed via the following NC/PLC interface signals:
● DB21, ... DBX276.0 - 277.1 == 1 (machine-related protection zone 1 - 10 violated)
● DB21, ... DBX278.0 - 279.1 == 1 (channel-specific protection zone 1 - 10 violated)
Behavior in special system states
Block search with calculation
For block search with calculation, the last programmed activation state of a protection zone is
always taken into account.
Program test
In the AUTOMATIC and MDI modes, activated and preactivated protection zones are also
monitored in the "Program test" state.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Value Meaning
0 The active protection zones are deactivated during the transformation change.
1 The active protection zones remain active during the transformation change.
0 The active protection zones are deactivated during the geometry axis change.
1 The active protection zones remain active during the geometry axis change.
A3: Axis Monitoring, Protection Zones
3.3 Protection zones
143