Configuration; Wiring The Ncus; Activation - Siemens SINUMERIK 840D sl Function Manual

B3: Distributed systems - 840D sl only
3.2 NCU link
3.2.1.5

Configuration

The NC system software supplies specific configurations for each supported combination of
NCU number and position controller cycle of a link group (see section "Parameter assignment:
NC system cycles (Page 87)").
During the system startup, the appropriate configuration will be loaded (as specified by the
values parameterized in the machine data):
● MD18782 $MN_MM_LINK_NUM_OF_MODULES (number of NCUs of the line group))
● MD10061 $MN_POSCTRL_CYCLE_TIME (position controller cycle)
Note
For applications, in which the standard configurations that have been supplied cannot be used,
please contact your local Siemens sales person.
3.2.1.6

Wiring the NCUs

The numerical sequence of the NCUs within a link group is defined in the NCUs using the
following machine data:
MD12510 $MN_NCU_LINKNO = <NCU number>, with NCU number = 1 ... max. NCU number
Cabling
Starting from the NCU1, the NCU link modules should be wired up in the NCU number
sequence according to the following schematic: NCU(n), Port 0 → NCU(n+1), Port 1
Figure 3-6
3.2.1.7

Activation

The link communication is activated using the following machine data:
90
Wiring schematic, NCU link
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions