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 NCU7x0.3PN 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 conguration of an NCU 7x0 with a PU 50, the default for a network conguration 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 conguration of more than 1 NCU 7x0 without PCU, with one or several PCU 50, then a
dierentiation must be made between two cases:
– At boot automatically all address conicts and DHCP conicts are resolved and the system
is ready for operation. In this conguration there is no guarantee that all NCUs and PCUs
will always receive the same IP address at each system boot.
– If in the user's view there is a requirement that all NCUs, and possibly also the PCUs, get a
dened constant IP address at each boot, for example because the IP address is entered
in the respective PLC program, then the user must congure a xed IP address for each
NCU7x0/PCU50 in question, in the basesys.ini le.
• The user can specify a DHCP master in the basesys.ini le.
• Assigning names:
– The user should assign meaningful names for all NCUs in the basesys.ini le; if not the
names will be generated automatically.
– A PCU50 always has a computer name that can be changed as needed.
• The IP addresses of TCUs and MCPs are freely assigned within the specied address band at
each boot. The MCPs are identied in the PLC via their DIP switch setting.
General information and networking
4.3Networking
Handheld Terminal HT 8
38 Equipment Manual, 02/2024, A5E52918633B AA
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