Siemens SINUMERIK 840D sl Function Manual page 125

3. If the position is on the protection zone limitation (position is still valid), no alarm is
Monitoring (pre)activated protection zones
(Pre)activated protection zones are also monitored in manual modes (JOG, INC,
handwheel).
Limitation of traversing motion of an axis
Axis motions are limited in JOG mode by means of software limit switches or the working
area limitation. The protection zones are an additional limiting element on the traversing
motion of the geometry axes.
If the traversing motion of an axis is limited because it has reached a protection zone, then a
selfresetting alarm "Protection zone reached in JOG" is generated. The alarm text specifies
the violated protection zone and the relevant axis. It is assured that no protection zone will
be violated when one axis is traversing in JOG. (This response is analogous to approaching
software limit switches or a working area limitation).
The alarm is reset:
• when an axis is traversed along a path that does not lead into the protection zone
• when the protection zone is enabled
• on NC RESET.
If an axis starts to move towards a protection zone when it is at a protection zone limit, then
a selfresetting alarm "Protection zone reached in JOG" is output and the motion is not
started.
Enabling of workpiece-related protection zones
When a workpiecerelated protection zone has been violated, the operator can also enable it
temporarily in JOG mode so that it can be traversed. This resets the alarm and the motion is
started in the manual operating modes after a new travel command.
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
The alarm is reset by:
– Temporary enabling of the affected protection zones
– Deactivation of the relevant protection zones if they are preactivated
– Deactivation of the protection zone in MDI
generated.
Note
While any one axis in the geometry system is still oscillating, the status "Motions of axes
in geometry system completed" cannot be reached.
The warning remains active, the other axes in the geometry system can continue to
traverse.
The alarm "Protection zone reached in JOG" is not output if the motion of the first axis to
be started is terminated by the limitation determined prior to the motion.
Detailed description
2.2 Protection zones
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