Restrictions In Protection Zones - Siemens SINUMERIK 840D sl Function Manual

A3: Axis Monitoring, Protection Zones
3.3 Protection zones
Reset of an enable
The enable is reset internally and on the NC/PLC interface at the next standstill of a geometry
axis for which the temporarily enabled protection zone has been completely exited:
DB21, ... DBX276.0 - 277.1 or DBX278.0 - 279.1 = 0 (protection zone violated)
Behavior with axis replacement
With regard to the protection zones after an axis replacement, the starting position is the last
position approached in the relinquishing channel. Traversing motions in the channel taking
over are not taken into account. For this reason, you must make sure that an axis replacement
is not performed from a position with protection zone violation.
Behavior for superimposed motions
Superimposed motions that are included in the main run, cannot be taken into account by the
block preparation with regard to the active protection zones.
This results in the following reactions:
● Alarm: "10704 Protection zone monitoring is not guaranteed"
● DB31, ... DBX39.0 = 1 (protection zone monitoring not guaranteed)
3.3.7

Restrictions in protection zones

Restrictions in protection-zone monitoring
No protection-zone monitoring is possible under the following conditions:
● Orientation axes
● Protection-zone monitoring for fixed machine-related protection zones with TRANSMIT or
peripheral surface transformation.
Exception: Protection zones defined with rotation symmetry around the spindle axis. Here,
no DRF offset must be active.
● Mutual monitoring of tool-related protection zones
Positioning axes
For positioning axes, only the programmed block end point is monitored.
An alarm is displayed during the traversing motion of the positioning axes:
Alarm: "10704 Protection-zone monitoring is not guaranteed".
Axis interchange
If an axis intended for the axis interchange is not active in a channel, the position of the axis
last approached in the channel is taken as the current position. If this axis has not yet been
traversed in the channel, zero is taken as the position.
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Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions