Siemens SINUMERIK 840Di Function Manual page 116

Detailed Description
2.4 Protection zones
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.
If the protection zone is violated, alarm
10700 "NCK protection zone violated in v or MDI"
or
10701 "Channel-specific protection zone violated in Automatic or MDI"
is triggered for the workpiece-related protection zone.
Fig. 2-16
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 "Protection
zone monitoring not guaranteed" DB31, ...DBX39.0 is set at the same time as alarm 10704.
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.
2-44
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
Axis Monitoring, Protection Zones (A3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0