Siemens SINUMERIK Series

A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.2 Access via PLC
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
35
1.2.3.3 Connection and logic operations of fast digital NCK I/Os
Function
Fast NCK I/O inputs can be set by software as a function of fast-output signal states.
Overview:
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Connecting
The NCK I/O fast input is set to the signal state of the assigned fast output.
OR operation
The NCK I/O fast input adopts the signal state as a result of the ORing of the output signal
with the assigned input signal.
AND operation
The NCK I/O fast input adopts the signal state as a result of the ANDing of the output signal
with the assigned input signal.
Special cases
● If several output bits are assigned to the same input bit, then the one with the highest MD
index becomes effective.
● If inputs or outputs are specified which do not exist or are not activated, then the
assignment is ignored without an alarm. Checking of the active bytes of the NCK I/Os is
performed via the entries in machine data:
MD10350 $MN_FASTIO_DIG_NUM_INPUTS
MD10360 $MN_FASTIO_DIG_NUM_OUTPUTS