Siemens SINUMERIK 840DE sl Commissioning Manual page 386

Configuring the network
17.2 Settings of the system network
17.2 Settings of the system network
The configuration for the DHCP server, the routing, active protocols, for DNS servers and other
properties of the system network is performed in the "Settings of the system network" window.
Setting
DHCP activated
DHCP server synchronization mode
DHCP address range
372
Description
Activates or deactivates the DHCP mode for the
system network. This automatically assigns IP ad‐
dresses to the nodes in the system network.
Activates or deactivates the DHCP server synchro‐
nization mode. If this setting is active, then the
DHCP servers synchronize themselves in the sys‐
tem network (X120) so that only one of them ac‐
tively assigns addresses. This makes it possible
to operate multiple NCUs or PCUs concurrently
without having to adjust the network settings.
The DHCP servers that are not active go into
"standby" mode; in this mode they regularly get the
current address data and TCU data from the active
server so that if the active server fails, a standby
server can take over the active role without data
loss.
● With the "Master priority" setting you can
influence the synchronization in such a manner
that the server with the "Master" setting is
always the active server (it must be active in
the network). This means that in the normal
situation, deterministically the same control is
always the DHCP server and you can find the
actual address data and the TCU data there.
"Master priority" must only be set for a single
DHCP server in the system network.
● The settings "Low priority " and "High priority"
can be used to specify which DHCP server
takes precedence as the active server. A
DHCP server with low priority is then only used
as active server when a server with high priority
cannot be found in the network.
Default: "High priority"
Specifies the range for DHCP addresses. The
range starts at the address specified at "Start" and
ends at the address entered at "End". The result‐
ing range of numbers has the following default set‐
ting:
Start address = first address in the system network
End address = start address + 10 or + 2 (if less
than 16 addresses are available)
Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
SINUMERIK Operate (IM9)