Siemens SINUMERIK 840D sl Function Manual page 39

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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

Defining assignments

The assignments are specified via machine data:

MD10361 $MN_FASTIO_DIG_SHORT_CIRCUIT[n]

n: can accept values 0 to 9, so up to 10 assignments can be specified.

Two hexadecimal characters are provided for specifying the byte and bit of an output and an

Specifying 0, A and B in input bits 12 - 15 results in the following logic operations:

Extended Functions

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

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.

AND operation

OR operation

Digital and Analog NCK I/Os (A4)

NCK I/O via PLC

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Sinumerik 840de sl