Siemens SINUMERIK 840D sl Function Manual page 100

Detailed description
2.1 Axis monitoring
General
• Changing of the software limit switch (1st ↔ 2nd software limit switch)
• Overrunning the software limit switch in JOG mode
2.1.8 Monitoring of the working area limitation
2.1.8.1 General
Function
The function "working area limitation" limits the traversing range of geometry axis and
special axis in the working area and monitors the adherence to the limits during the
traversing of the axes.
The following versions are available:
• Working area limitation in BKS
• Working area limitation in WKS/ENS
Both the working area limitation monitorings are independent of each other. If both
monitoring functions are active, that limit becomes effective which the axis motion first
reaches.
Reference point at the tool
Taking into account the tool data (tool length and tool radius) and therefore the reference
point at the tool when monitoring the working area limitation depends on the activity of
certain transformations:
• Transformations are not active
34
If the actual position of the machine axis after changing lies behind the software limit
switch, it is stopped with the maximum permissible acceleration.
If the position of the software limit switch is reached and renewed pressing of the
traversing button should cause further travel in this direction, an alarm is displayed and
the axis is not traversed farther:
Alarm 10621 "Channel <Channel number> Axis <Axis identifier> is at the software limit
switch <Direction>"
The coordinate data for limiting the working area refer to the basic coordinate system.
The coordinate data for limiting the working area refer to the workpiece coordinate
system (WKS) and settable zero system (ENS).
Without transformations during traversing motion with an active tool the position of the
tool tip P is monitored, i.e., during the monitoring the tool length is considered
automatically.
Consideration of the tool radius must be activated separately:
MD21020 $MC_WORKAREA_WITH_TOOL_RADIUS (Consideration of the tool radius in
the working area limitation)
Basic logic functions: Axis monitoring, protection zones (A3)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0