Siemens SINUMERIK 840D sl Function Manual page 121

2.2.6 Protection-zone violation and temporary enabling of individual protection zones
Function
Workpiece and toolrelated protection zones that are activated or deactivated are monitored
for collision. If a protection-zone violation is detected, behavior in the individual operating
modes is as follows.
Terminating temporary enabling
Temporary enabling of a protection zone is terminated after the following events:
• after NC RESET
• Operating modes AUTOMATIC or MDA End of block is outside the protection zone
• Manual operating modes: End of movement is outside the protection zone
• Activating a protection zone
On NC RESET all the enabled protection zones become active again. If the part program or
jog mode is started again, the protection zones must be reenabled. If the current position lies
within a protection zone that becomes active again after NC RESET, this protection zone
must be enabled again on the first path movement.
Preactivated protection zones
Protection zones can be preactivated with part programs. To make them fully operative, they
must also be set to the "operative" state by the PLC.
In contrast to AUTOMATIC mode, a change in the NC/PLC interface signals "Make
preactivated protection zones operative" only has an effect on stationary axes in the
geometry system. This means: If an inoperative protection zone is made "operative" once a
motion has been started, it is not evaluated until the axes have stopped, possibly resulting in
the output of an alarm.
If a preactivated protection zone is made "operative" during traversing, the alarm 10704
"Protection-zone monitoring is not guaranteed" and the PLC interface signal are set:
DB31, ... DBX39.0 (protection-zone monitoring not guaranteed).
Deactivation of toolrelated protection zones
Toolrelated protection zones can be deactivated only in the part program or, if they have
been preactivated, by being rendered "inoperative" by the PLC.
Geometry axis change and transformation change
Through the following machine data it is adjustable, whether active protection zones are
retained or deactivated during the geometry axis change or transformation change:
MD10618 $MN_PROTAREA_GEOAX_CHANGE_MODE
Bit
0
1
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Value Significance
0 Protection zones are deactivated during the transformation change.
1 Active protection zones remain active after a transformation is changed.
0 Protection zones are deactivated during the geometry axis change.
1 Active protection zones remain active after a geometry axis change.
Detailed description
2.2 Protection zones
55