Connection And Logic Operations Of Fast Nck Inputs/Outputs - Siemens SINUMERIK 840D sl Function Manual

Digital and analog NCK I/Os (A4)
1.2 NCK I/O via PLC
1.2.3

Connection and logic operations of fast NCK inputs/outputs

Function
Fast NCK I/O inputs can be set using software as a function of fast-output signal states.
Overview:
Connect
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
● If inputs or outputs are specified which do not exist or are not activated, then the
38
index becomes effective.
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.
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions