Siemens SINUMERIK 828D Function Manual page 126

A3: Axis Monitoring, Protection Zones
2.3 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 exchange
If an axis is not active in a channel because of an axis replacement, 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.
Machine-related protection zones
A machine-related protection zone or its contour is defined using the geometry axis, i.e. with reference to the
basic coordinate system (BCS) of a channel. In order that correct protection-zone monitoring can take place in all
channels in which the machine-related protection zone is active, the basic coordinate system (BCS) of all
affected channels must be identical (position of the coordinate point of origin with respect to the machine zero
point and orientation of the coordinate axes).
Basic Functions
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0