Siemens SINUMERIK 828D Function Manual page 124

A3: Axis Monitoring, Protection Zones
2.3 Protection zones
There are three possible situations in this case:
1. If the position is outside all active protection zones, the next traversing motion can be started normally. The
appropriate PLC interface signals "Machine­specific or channel­specific protection zone violated" are set for
the protection zones that are enabled or just preactivated, but not yet operative.
2. If the position is within an active protection zone, the alarm "Protection zone violated in JOG" is generated,
thereby disabling any traversing motions. The appropriate PLC interface signals "Machine­specific or
channel­specific protection zone violated" are also set.
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
3. If the position is on the protection zone limitation (position is still valid), no alarm is 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.
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.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions