Siemens SINUMERIK 840D sl Function Manual page 31

Example for 840D
Analog-value range is 10 V (maximum modulation);
MD10330 $MN_FASTIO_ANA_OUTPUT_WEIGHT[hw] = 10000
(standard value for 840D)
$A_OUTA[1] = 9500 ; 9.5 V is output at analog NCK output 1
$A_OUTA[3] = -4120 ; -4.12 V is output at analog NCK output 3
Application for analog NCK inputs/outputs without hardware:
With a weighting factor of 32767, the digitized analog values for part program and PLC
access are identical. In this way, it is possible to use the associated input or output word for
1:1 communication between the part program and the PLC.
Assignment to NC functions
Several NC functions are dependent on the functionality of the NCK I/Os.
Assignment of NCK inputs and outputs for these NC functions
is accomplished function-specifically via machine data, for instance:
MD21220 $MC_MULTFEED_ASSIGN_FASTIN (Multiple feedrates in one batch).
A byte address should be specified in the machine data for digital inputs/outputs. Each byte
is assigned separately.
Byte address
0
1
2
3
4
5
128
129
Isochronous processing
The I/O modules of the external NCK I/Os on the SINUMERIK 840D can be operated in one
of the following two modes:
● Asynchronous
● Synchronous
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Assignment for the digital NCK inputs/outputs
None
1 to 4 (on-board I/O)
9
17
25
33
Inputs 1 to 8 of comparator byte 1
Inputs 9 to 16 of comparator byte 2
The input and output values are made available in cycles set by the terminal block, which
are asynchronous with the internal NC processing cycles.
The input and output values are made available in synchronism with a settable internal
NC processing cycle.
Digital and Analog NCK I/Os (A4)
and 5 to 8 (NCK output without hardware)
to 16 (external NCK I/Os)
to 24 (external NCK I/Os)
to 32 (external NCK I/Os)
to 40 (external NCK I/Os)
NCK I/O via PLC
31