B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
85
Time frame of the NC/PLC interface update
The following setting is active during the run-up of all NCUs involved in the link group:
MD18000 $MN_VDI_UPDATE_IN_ONE_IPO_CYCLE = 1
This causes the NC/PLC interface to be read and written completely in just one interpolation
cycle.
2.2.1.4 Parameter assignment: Link communication
NC-specific machine data
Number Identifier $MN_ Meaning
MD12510 NCU_LINKNO Unique numerical identification of the NCU within the link group. The
identifiers must be assigned without any gaps in ascending ordering
starting from 1.
Value range: 1, 2, ... Maximum NCU number
Note:
The NCU to which the value 1 is assigned as NCU identification is the
master NCU of the link group. The parameterization of link axes and
axis containers may only be made with the machine and setting data of
the master NCU.
MD18780 MM_NCU_LINK_MASK.Bit 0 Activation of the link communication
MD18781 NCU_LINK_CONNECTIONS Number of internal link connections
Note:
It is recommended to retain the default value 0 (determination of the
number by the NC).
MD18782 MM_LINK_NUM_OF_MODULES Number of NCUs to be connected with one another via NCU link.
2.2.1.5 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
assignm
ent: NC system cycles (Page 83)").
Duri
ng 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.
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