Siemens SINUMERIK 840D sl Function Manual page 30

Digital and Analog NCK I/Os (A4)
NCK I/O via PLC
● The value 05000000 in the machine data:
● The input is then treated like a simulation input.
System variable
The following table lists the system variables with which NCK I/Os can be read or written
directly by the part program.
The number of the NCK input/output is used for addressing.
Applies to n:
1 ≤ n ≤ 8 * MD10350 $MN_FASTIO_DIG_NUM_INPUTS
1 ≤ n ≤ 8 * MD10360 $MN_FASTIO_DIG_NUM_OUTPUTS
1 ≤ n ≤ MD10300 $MN_FASTIO_ANA_NUM_INPUTS
1 ≤ n ≤ MD10310 $MN_FASTIO_ANA_NUM_OUTPUTS
System variable
$A_IN[n]
$A_INA[n]
$A_INCO[n]
PBB
$A_OUT[n]
$A_OUTA[n]
Note
When these system variables are read by the part program, a preprocessing stop (STOPRE
command) is initiated inside the control.
Weighting factor
The evaluation factors of the following general machine data allow each individual analog
NCK input and output to be adapted to the AD or DA converters of the analog I/O module
used:
MD10320 $MN_FASTIO_ANA_INPUT_WEIGHT[hw]
MD10330 $MN_FASTIO_ANA_OUTPUT_WEIGHT[hw]
If the correct weighting factor is set, the value set in system variable $A_OUTA[n] generates
the corresponding voltage value in millivolts at analog output [n].
30
$MN_HW_ASSIGN_...
represents the signal "Slot is not present physically".
Description
Read digital NCK input [n]
Read analog NCK input [n]
Read comparator input [n]
Read/write digital NCK output [n]
Read/write analog NCK output [n]
Range of [n]
1 to 3, 9 to 40
1 to 8
1 to 16
1 to 40
1 to 8
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions