Siemens SINUMERIK 840D sl Function Manual page 30

A4: Digital and analog NCK I/Os
1.2 NCK I/O via PLC
Number
The number of addressable digital NCK input/output bytes and analog inputs/outputs must
be defined by means of general machine data.
Machine data
MD10350 $MN_FASTIO_DIG_NUM_INPUTS
MD10360 $MN_FASTIO_DIG_NUM_OUTPUTS
MD10300 $MN_FASTIO_ANA_NUM_INPUTS
MD10310 $MN_FASTIO_ANA_NUM_OUTPUTS
Note
On the SINUMERIK 840Di, the first byte is always assigned to the four digital I/Os on the
MCI-Board-Extension module. Even if you do not have an MCI-Board-Extension module
connected to the SINUMERIK 840Di, the first byte will still be occupied by this module.
For this reason an entry of at least two bytes must be made into the machine data:
$MN_FASTIO_DIG_NUM...
if you want to operate additional I/O peripherals via the PROFIBUS.
Corresponding alarms are generated if the part program addresses inputs/outputs that have
not been defined in the above machine data.
These NCK inputs/outputs do not have to actually exist in the hardware.
In this case the signal states or the binary analog values are set to "zero" in a defined way
inside the NCK. However, these values can be changed by the PLC.
Hardware assignment of the external NCK I/Os
The following general machine data are provided for assigning I/O signal modules or I/O
modules to external NCK I/Os:
MD10366 $MN_HW_ASSIGN_DIG_FASTIN[hw]
(H/W assignment for external digital inputs)
MD10368 $MN_HW_ASSIGN_DIG_FASTOUT[hw]
(H/W assignment for external digital outputs)
MD10362 $MN_HW_ASSIGN_ANA_FASTIN[hw]
(H/W assignment for external analog inputs)
MD10364 $MN_HW_ASSIGN_ANA_FASTOUT[hw]
(H/W assignment for external analog outputs)
[hw]:
30
Index for addressing the external digital I/O bytes (0 to 3) or the external analog
inputs/outputs (0 to 7)
Number of active ...
... Digital NCK input bytes
... Digital NCK output bytes
... Analog NCK inputs
... Analog NCK outputs
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Max. number
5
5
8
8
Extended Functions