Siemens SINUMERIK 840D sl Function Manual page 46

Digital and Analog NCK I/Os (A4)
NCK I/O via PLC
Weighting factor
The weighting factor in general machine data
MD10330 $MN_FASTIO_ANA_OUTPUT_WEIGHT[hw].
can be used to adapt the analog NCK outputs to the different digital-to-analog converter
hardware variants for the purpose of programming in the part program (see fig.).
In this machine data, it is necessary to enter the value x that is to cause the analog output [n]
to be set to the maximum value or the value 32767 to be set for this output in the PLC
interface, if $A_OUTA[n] = x is programmed. The value set with system variable $A_OUTA[n]
then generates the corresponding voltage value at the analog output in millivolts.
Binary analog-value display
See "Analog-value representation of the NCK analog input/output values".
Special case
If values for NCK analog outputs defined in machine data
MD10310 $MN_FASTIO_ANA_NUM_OUTPUTS
are programmed in the part program, but are not available as hardware, no alarm is output.
The NCK value can be read by the PLC (IS "setpoint ...").
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Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions