Siemens SINUMERIK 840D sl Function Manual page 147

The resulting maximum traversing range at the start time does not take protection zone 3 into
account. Therefore, a protection zone violation in protection zone 3 is possible.
Note
Activated and preactivated protection zones are also monitored in the manual operating modes
JOG, INC and DRF.
Limitation of traversing motion of an axis
If the traversing motion of an axis is limited because it has reached a protection zone, then a
selfresetting alarm "Protection zone reached in JOG" is generated. The alarm text specifies
the violated protection zone and the relevant axis. It is assured that no protection zone will be
violated when an axis is traversing in JOG. (This response is analogous to approaching
software limit switches or a working area limitation.)
The alarm is reset:
● When an axis is traversed along a path that does not lead into the protection zone
● When the protection zone is enabled
● On NC RESET
If an axis starts to move towards a protection zone when it is at a protection zone limit, then a
selfresetting alarm "Protection zone reached in JOG" is output and the motion is not started.
Temporary enabling of protection zones
If a traversing motion is started within or on the limit of an activated protection zone, alarm
10702 or 10703 is displayed and the traversing motion is not started. The traversing motion
can be performed when the relevant protection zone is temporarily enabled. The following
actions must be performed for this:
● Create a positive edge at the NC/PLC interface signal:
DB21, ... DBX1.1 (enable protection zone)
● Start the same traversing motion again
Note
The NC/PLC interface signal "Protection zone violated" is still set when the temporarily
enabled protection zone is traversed:
DB21, ... DBX276.0 – 277.1 or DBX278.0 – 279.1
The enable is reset if a motion is started that does not lead into the enabled protection zone.
If further protection zones are affected by the traversing motion, additional alarms 10702 or
10703 are displayed for each protection zone. The protection zones displayed in the alarms
can be enabled by creating further positive edges on the NC/PLC interface signal:
DB21, ... DBX1.1 (enable protection zone)
Behavior at change of operating mode
The protection zones temporarily enabled in JOG mode are retained after a change to
AUTOMATIC or MDA mode. The temporary enables set the in the AUTOMATIC or MDA mode
are also retained after a change to JOG mode.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
A3: Axis Monitoring, Protection Zones
3.3 Protection zones
147