Siemens SINUMERIK 840D sl Function Manual page 124

Detailed description
2.2 Protection zones
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
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.
There are three possible situations in this case:
1. If the position is outside all active protection zones, the next traversing motion can be
2. If the position is within an active protection zone, the alarm "Protection zone violated in
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Motion boundaries of axes
started normally. The appropriate PLC interface signals "Machinespecific or channel-
specific protection zone violated" are set for the protection zones that are enabled or just
preactivated, but not yet operative.
JOG" is generated, thereby disabling any traversing motions. The appropriate PLC
interface signals "Machinespecific or channelspecific protection zone violated" are also
set.
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0