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Networking
6.1 System settings
6.1.3
System boot with system network
System behavior at boot
The system boot behavior is based on the following principle:
• For the configuration of an NCU 7x0 with a PCU/IPC, the default for a network configuration
is as follows: The NCU keeps the default IP address 192.168.214.1 on X120, the PCU/IPC
keeps the default IP address 192.168.214.241 on Eth2.
• For a configuration of more than one NCU 7x0 without PCU/IPC, with one or morel PCUs/IPCs,
a distinction must be made between two cases:
– All address conflicts and DHCP conflicts are resolved automatically when booting and the
– If the user requires all NCUs, and possibly also the PCU/IPC, to have a defined constant IP
• You can specify a DHCP master in the basesys.ini file.
• Assigning names:
– Assign meaningful names for all NCUs in the basesys.ini file otherwise the names will be
– A PCU/IPC always has a computer name, which you can change if required.
• The IP addresses of the TCU, MCP/MPP, EKS, HT2, and HT8 are freely assigned within the
specified address range on each boot. MCP/MPP, HT2, and HT8 are identified in the PLC via
their DIP switch settings.
Using DNS name service
Availability of the DNS (Domain Name System) name service offers the following advantages for
system network administration:
• The name service enables easier configuration with names instead of IP addresses for
management of operating units: All components in the system network can be addressed via
a symbolic computer name. This name can to some extent be freely assigned, to some extent
it is derived automatically from a DIP switch setting (MCP, MPP, EKS, HT 8, HT 2).
• A computer node in the system network (NCU, PCU/IPC, TCU, MCP, HT 8, etc.) can be
addressed solely through assignment of the IP address, either via a freely selectable name or
via an internally generated name in the system network, and thus becomes independent
from its network address in the system network. Thus a change in the network address does
not necessarily necessitate a series of additional setting changes.
• In addition, the name service is used by the system for address resolution for MCP/MPP, direct
keys, and EKS when changing the user authorization.
42
system is ready for operation. In this configuration there is no guarantee that all NCUs and
PCUs/IPCs will always receive the same IP address at each system boot.
address at each boot, for example, because the IP address is stated explicitly in the PLC
program, the user must configure a fixed IP address in the adapter settings in the Windows
Control Panel for each affected NCU 7x0/PCU/IPC.
generated automatically.
Equipment Manual, 03/2023, A5E40874197B AD
TCU 30.3
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