Lenze E94AYFLF Digital frequency module - Manual (Page 16)

Digital frequency extension module | Parameter setting & configuration
Digital frequency input
Parameter setting
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EDS94AYFLF EN 3.2 - 10/2010
2.2.7 Touch probe
When the zero pulse occurs on track Z - Z, a touch probe is triggered.
 The corresponding signals to execute touch probe processing are available via the
system block LS_TouchProbeDFIN.
 In C13021 / C14021 a delay time can be set for the touch probe.
 If a touch probe has been triggered, the output DFIN_bTouchProbeReceived is set to
TRUE for one cycle.

Tip!
Detailed information on touch probe processing can be found in the online
documentation for the controller in chapter "I/O terminalsTouch probe
detection".