Siemens SINUMERIK 828D Function Manual page 121

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 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).
• 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 Behavior of the path velocity when entering a protection zone
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).
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
A3: Axis Monitoring, Protection Zones
2.3 Protection zones
121