Siemens SINUMERIK 840D sl Function Manual page 55

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Comparator signals as digital NCK inputs

All NC functions that are processed as a function of digital NCK inputs can also be controlled

by the signal states of the comparators. The byte address for comparator byte 1 (HW byte

128) or 2 (HW byte 129) must be entered in the MD associated with the NC function

("Assignment of hardware byte used").

"Multiple feedrates in one block" NC function

Entry in channel-specific machine data:

MD21220 $MC_MULTFEED_ASSIGN_FASTIN = 129

This activates various feedrate values as a function of the status of comparator byte 2.

Extended Functions

Function Manual, 03/2009, 6FC5397-1BP10-4BA0

Digital and Analog NCK I/Os (A4)

NCK I/O via PLC

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Sinumerik 840de sl