Siemens SINUMERIK 840D sl Function Manual page 122

Detailed description
2.2 Protection zones
Monitoring of overlaid motion
Axes that have been assigned to another channel are not taken into account. The last
position to be approached is taken to be the end position. It is not taken into account whether
the axis has traversed after changing channels.
Behavior in the AUTOMATIC and MDI operating modes
Protection zones are not overrun in Automatic modes:
• If the movement in a block is from outside into the protection zone (N30), deceleration is
• If the starting point of the block is inside the protection zone, the movement is not started.
In case of violation of protection zone for the workpiece-related protection zone, the alarm:
10700 "NCK-protection zone in v or MDI violated" or 10701 "channel-specific protection zone
in AUTOMATIC or MDI violated" is given.
Figure 2-14
Overlaying several axis motions
Overlaid motions of external ZO (zero offsets) or DRF are taken into account if they are
executed at a sufficiently early point in time.
If an overlaid motion occurs while a protection zone is active or operative, an alarm is output
as a warning. This alarm has no effect on the machining operation and resets itself if the
transferred motion has been fully taken into account. The PLC interface signal is set at the
same time as alarm 10704:
DB31, ... DBX39.0 (protection-zone monitoring not guaranteed).
Enabling of workpiece-related protection zones
When a workpiece-related protection zone has been violated, the operator can enable it
temporarily with NC start in the AUTOMATIC and JOG modes so that it can be traversed.
This clears the alarm and travels into the protection zone in the AUTOMATIC and MDI
operating modes.
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executed toward the end of the previous block (N20) and the movement is stopped.
– If the protection zone is preactivated but not activated by the PLC, machining is
continued (case 1).
– If the protection zone is activated or preactivated and activated by the PLC, machining
is stopped (case 2).
Behavior of the path velocity when entering a protection zone
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0