Siemens SINUMERIK 840D sl Function Manual page 42

Digital and Analog NCK I/Os (A4)
NCK I/O via PLC
Analog NCK input without hardware
The following values are read in the case of parts-program access to analog NCK inputs that
are defined via machine data, but are not available as hardware inputs:
MD10300 $MN_FASTIO_ANA_NUM_INPUTS
● The setpoint set by the PLC,
● Otherwise 0 volts
This makes it possible to use the functionality of the analog NCK inputs from the PLC user
program without I/O hardware.
Applications
The analog NCK inputs are used particularly for grinding and laser machines (e.g. for the
"analog calipers" NC function).
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if the IS "PLC setting value for analog NCK inputs"
is set to "1" (see fig.).
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions