Services:
X DHCP
✔ TFTP
✔ FTP
✔ VNC
Services:
✔ DHCP
X TFTP
X FTP
✔ VNC
Services:
X DHCP
X TFTP
X FTP
✔ VNC
Company network
In this case, PCU_2 serves as the DHCP server which provides the IP addresses for the
connected TCUs. PCU_3 is not involved in booting the TCUs, it is however displayed by the
TCUs using VNC.
1.4.3 Network configuration
1.4.3.1 Permissible network topologies
Ethernet connection
A SINUMERIK 840 D sl can only be operated as a network within which the individual
components communicate with one another via Ethernet connections. This network must be
set up.
The individual components are factory-set so that the most frequently occurring standard
configurations can be operated without changing the settings related to the network.
Division into system network and company network
On the SINUMERIK solution line, the components are generally split into a company network
on the one hand and a system network on the other.
The connection to the company network provides access to the network drives, for example.
On the system network, process data communication and image transmission runs from the
components with operator software to the display units – the respective TCU.
This split is performed physically by means of the prescribed use of the Ethernet interfaces on
the components:
● A TCU is connected exclusively to the system network.
● An NCU is always connected to the system network via X120.
● Ethernet interface Eth 2 of the PCU is preconfigured for connection to the system network;
while Ethernet interface Eth 1 is used for connection to the company network.
● An NCU is connected to the company network via X130.
Meaning of the connections:
○ Eth 1 as a DHCP client
● Eth 2 as a DHCP server
■ Eth 2 with a fixed IP address
General information and networking
1.4 Networking
Operator panel front: OP 012
Manual, 09/2016, A5E36371591B 77
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