Lenze E94A - Manual (Page 536)

5 Function blocks
5.143 L_SdTouchProbe - touch probe evaluation
536
Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
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5.143.1 Actual value interpolation (principle)
If a touch probe is detected, the (residual) time to the following task cycle is determined and a time
stamp is created from it. Based on this time stamp the FB L_SdTouchProbe can execute a linear in-
terpolation between both actual position points. The result is the exact actual position at the time
of the physical touch probe event.
[5-111] Actual value determination through linear interpolation (principle)
5.143.2 Example
Connections required for a touch probe detection via the digital input DI4:
[5-112] Transfer of the FB L_SdTouchProbe
 Actual position point 1
 Actual position point 2
 Residual time (dnTpTimeLag)
Data
processing
Application
Data
processing
Application
Data
processing
Application
Task cycle Task cycle Task cycle
t
Position
t
0
Œ 
t
1
p
1
p
2
Touch probe received
 Transfer of the machine parameters (e.g. from SB LS_DriveInterface)
 Transfer of the current position (e.g. from SB LS_Feedback)
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