Siemens SINUMERIK 828D Function Manual page 123

The alarm is canceled or the PLC interface signal reset when the offsets from the overlaid motions are taken into
account again or when the offsets are reduced to zero again.
Note
The end position for positioning axes is taken to be a position in the whole block. This means
that the alarm 10704 "Protection zones not guaranteed" is output when the positioning axis
starts to move. The overlaid motions themselves are not limited, nor is there any intervention
in processing of the program.
Behavior in JOG mode
Overlaying several axis motions
In JOG mode traversing can be performed simultaneously in several geometry axes even when protection zones
are active. However, safe monitoring of protection zones can then no longer be guaranteed. This is indicated as
follows:
• Alarm: " 10704 Protection-zone monitoring is not guaranteed"
• DB31, ... DBX39.0 = 1 (protection-zone monitoring not guaranteed)
The traversing range of the geometry axes is limited in all directions by the protection zones with the same effect
as they had at the start point.
Figure 2-15 Motion boundaries of axes
When the geometry axes have completed their movements (end of interpolation), the alarm is automatically reset
and the final position checked to see whether it is within one or several protection zones.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
A3: Axis Monitoring, Protection Zones
2.3 Protection zones
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