Contour Tunnel Monitoring - Siemens SINUMERIK 840D sl Function Manual

4.2

Contour tunnel monitoring

Aim of the monitoring function
The aim of the monitoring function is to stop the movement of the axes if axis deviation
causes the distance between the tool tip (actual value) and the programmed path (setpoint) to
exceed a defined value (tunnel radius).
Tunnel size
The radius of the contour tunnel being monitored around the programmed path must be
defined to implement the monitoring function:
MD21050 $MC_CONTOUR_TUNNEL_TOL (Response threshold for Contour tunnel
monitoring)
If the machine data is set to 0.0, monitoring is not performed. The value of the machine data
is transferred to the control for new configurations.
Parameterizable deceleration behavior
The deceleration behavior for the monitoring response can be set via the following machine
data:
MD21060 $MC_CONTOUR_TUNNEL_REACTION (Reaction upon response of contour
tunnel monitoring)
Value
0
1
2
Encoder switchover
Switching between two encoder systems usually causes a sudden change in the actual
position of the tool tip. This change resulting from encoder switchover must not be so large as
to cause the tool tip to violate the monitoring tunnel. The radius defined in MD21050 must be
higher than the allowed tolerance on actual value switchover:
MD36500 $MA_ENC_CHANGE_TOL (Max. tolerance for position actual value switchover)
Activation
The monitoring will only become active if the following conditions are met:
• MD21050 is higher than 0.0.
• At least two geometry axes have been defined.
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Meaning
Display alarm and continue machining
Deceleration according to the deceleration ramps (default setting)
Rapid stop (speed setpoint = 0)
K6: Contour tunnel monitoring
4.2 Contour tunnel monitoring
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