Siemens SINUMERIK 840D sl Function Manual page 145

Behavior in the AUTOMATIC and MDA modes
In AUTOMATIC and MDA mode, no traversing motion is enabled into or through active
protection zones:
● A traversing motion that would lead from outside into an active protection zone, is stopped
at the end of the last block located outside the protection zone.
● A traversing motion that begins within an active protection zone is not started.
Temporary enabling of protection zones
If a traversing motion is stopped in AUTOMATIC or MDA mode because of a protection zone
violation, this is indicated to the operator by an alarm. If the operator decides that the traversing
motion can be continued, the crossing of protection zones can be enabled.
The enabling is only temporarily and is performed by triggering NC START:
DB21, ... DBX7.1 = 1 (NC START)
An alarm is displayed for each violated protection zone. An NC START signal must be triggered
by the operator for each protection zone to be enabled.
The traversing motion is continued when all protection zones that have resulted in the stopping
of the traversing motion, have been enabled.
Continuation of a traversing motion without temporary enabling
A traversing motion was stopped with an alarm because of a protection zone violation. If the
relevant protection zone is set to the "Preactivated" state via the NC/PLC interface, the
traversing motion can be continued with NC START, without the protection zone being
temporarily enabled.
Increased protection against the enabling of protection zones
If the enabling of a protection zone is to be protected better than just by NC START, this must
be performed by the machine manufacturer or user in the PLC user program.
Behavior in JOG mode
Simultaneous traversing of several geometry axes
In JOG mode, traversing motions can be performed simultaneously in several geometry axes.
The traversing range of every participating geometry axis is limited axis-specifically at the start
of the traversing motion with regard to the traversing range limits (software limit switches,
working area limitation, etc.) and active protection zones. However, safe monitoring of all active
protection zones cannot be guaranteed. The following is provided as feedback to the user:
● Alarm: "10704 Protection zone monitoring is not guaranteed"
● DB31, ... DBX39.0 = 1 (protection zone monitoring not guaranteed)
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
A3: Axis Monitoring, Protection Zones
3.3 Protection zones
145