Siemens sinumerik 840D sl Function Manual page 207

Brief description
1.1 Contour tunnel monitoring
Function
The absolute movement of the tool tip in space is monitored. The function operates channel
specific.
Model
A round tunnel with a definable diameter is defined around the programmed path of a
machining operation. Axis movements are stopped as an option if the path deviation of the
tool tip is greater than the defined tunnel as the result of axis errors.
Response
In the event of a recognised deviation, the system reacts as quick as possible. However, at
least one interpolation cycle will pass, before one of the following reactions will occur:
• An alarm is triggered when the tunnel is violated and the axes continue to traverse.
• Violation of the tunnel triggers an alarm and the axis movements are decelerated.
Deceleration methods
If the monitoring tunnel is violated, one of the following methods can be used to decelerate:
• Deceleration ramp
• Speed setpoint zero and follow-up mode
Use
The function can be used for 2D and 3D paths. For 2D the monitoring surface is defined by
parallel lines to the programmed path. The monitoring area is defined by 2 or 3 geometry
axis.
Monitoring of synchronized axes, positioning axes, etc. that are not geometry axes is
performed directly on the machine axis plane with the "Contour monitoring".
Example
The following figure is a diagram of the monitoring area shown by way of a simple example.
Special functions: Contour Tunnel Monitoring (K6)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
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