System Boot With System Network - Siemens SINUMERIK 840D sl Equipment Manual

General information and networking
4.3 Networking
Service interface X127
The service interface X127 of the NCU is used for direct connection of a PG/PC for service
purposes. Here access with STEP 7 to the PLC, and with NCU 7x0.3 PN also to PROFINET is
possible.
With direct connection (peer-to-peer) of a PG/PC to X127 it is absolutely necessary that the
PG is operated as a DHCP client.
4.3.1.2

System boot with system network

System behavior at boot
As of NCU system software V2.4 SP1 and PCU-Basesoftware V8.1, system boot behavior is based
on the following principle:
• For configuration of an NCU 7x0 with a PU 50, the default for a network configuration is as
follows: The NCU keeps the default IP address 192.168.214.1 on X120, the PCU 50 keeps the
default IP address 192.168.214.241 on Eth2.
• For a configuration of more than 1 NCU 7x0 without PCU, with one or several PCU 50, then a
differentiation must be made between two cases:
– At boot automatically all address conflicts and DHCP conflicts are resolved and the system
– If in the user's view there is a requirement that all NCUs, and possibly also the PCUs, get a
• The user can specify a DHCP master in the basesys.ini file.
• Assigning names:
– The user should assign meaningful names for all NCUs in the basesys.ini file; if not the
– A PCU 50 always has a computer name that can be changed as needed.
• The IP addresses of TCUs and MCPs are freely assigned within the specified address band at
each boot. The MCPs are identified in the PLC via their DIP switch setting.
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is ready for operation. In this configuration there is no guarantee that all NCUs and PCUs
will always receive the same IP address at each system boot.
defined constant IP address at each boot, for example because the IP address is entered
in the respective PLC program, then the user must configure a fixed IP address for each
NCU 7x0/PCU 50 in question, in the basesys.ini file.
names will be generated automatically.
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Equipment Manual, 02/2024, A5E52918633B AA