Siemens SINUMERIK 840DE sl Manual page 40

Networking
5.1 System settings
Preconfiguration of the NCU
On the X120, the NCU is preconfigured for the SINUMERIK DHCP protocol. The NCU is pre-
selected here as a SINUMERIK DHCP server. On X120, the NCU occupies the fixed IP address
192.168.214.1 with the subnet mask 255.255.255.0 in its capacity as a DHCP server. The
DHCP server of the NCU assigns IP addresses from the range 192.168.214.10 –
192.168.214.239 to the DHCP clients.
It is also possible to make the NCU a DHCP client. The configured IP address in basesys.ini is
a "requested" IP address, which is rejected in the case of an address conflict and replaced by
a dynamic IP from the address range.
In large system networks, it makes sense to set an NCU/PCU/IPC as the DHCP master. If an
additional 2-3 hosts are used (NCU/PCU/IPC), the user sets the DHCP priority to "ON_HIGH".
For the other hosts, the user sets DHCP priority to "ON_CLIENT_SYNC" or
"ON_CLIENT_NO_SYNC".
Restricting the available address band that is managed by the DHCP server of the NCU frees
up IP addresses 192.168.214.2 to 192.168.214.9 as well as addresses 192.168.214.241 to
192.168.214.254 for network nodes with fixed IP addresses.
On X130, the NCU is set as a default DHCP client for the address reference from a company
network. The IP address received here is specified by the DHCP server from the company
network.
On X127, an NCU is a standard DHCP server in contrast to the SINUMERIK DHCP server. On
X127, the NCU has the fixed IP address 192.168.215.1 with the subnet mask 255.255.255.224
as Service input. The IP addresses 192.168.215.2 – 192.168.215.23 are dynamically assigned
to the DHCP clients. The range 192.168.215.24 - 192.168.215.30 is reserved, and can be used
by stations on the network with a fixed IP address, e.g. by a modem.
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The NCU has three Ethernet connections:
● X120 to connect to the system network with an active DHCP
server (Eth 0)
● X130 to connect to the company network as the standard
DHCP client (Eth 1)
● X127 as a service connection with an active DHCP server (Ibn
0)
Operator panel front: OP 015 black
Manual, 05/2019, A5E35227814B AB