If the company network offers a low level of administration (in the worst case scenario the
network has only one DHCP server that assigns the addresses from a predefined address
range) the NCU receives an IP address that is initially unknown.
5.3.3.2 Configuration 3: PCU with TCU on NCU
Description
6ZLWFK
1&8
7&8
3&8
6\VWHPQHWZRUN
&RPSDQ\QHWZRUN
6ZLWFK
;
(WK
;
(WK
In this configuration, a switch is also required for the system network. All components are
connected using straight Ethernet cables.
In terms of address allocation and the settings that need to be made, this configuration is
identical to that of configuration 4. However, in this case, the DHCP server of the NCU actually
supplies the TCU with an IP address and serves as a boot server for the TCU.
The observations made for configuration 3 also apply here in relation to the connection to the
company network. The connection to a switch on the company network is made via a straight
Ethernet cable.
To connect one TCU to both HMI systems you must create an additional connection to the
NCU for the TCU, as described in the following chapter:
Networking
5.3 Network configuration
TCU 30.3
48 Manual, 09/2017, A5E40874197
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