Siemens SINUMERIK 840D sl Commissioning Manual page 842

Configuring the system
2.5 Description of the actions
"sc enable IPAlias" defines a second alias IP address for a network interface. This is only
supported for X120. The IP address itself has the usual notation with four numbers
separated by decimal points. If not specified, the subnet screen form can be determined from
the class (A/B/C) of the IP or determined explicitly. The CIDR notation (number of bits of the
network section) is also possible.
See also
Parameters "InternalIP_Alias" and "InternalNetMask_Alias" in the "basesys.ini" file.
Specific subsystems
The name "DHCPSvr" is a special case. This does not switch a normal subsystem on or off,
but specifies whether or not a DHCP server should be started on a network interface. The
interface is entered in the standard form.
The commands "sc enable" and "sc disable" function by changing certain variables in the file
/user/system/etc/basesys.ini. In subsystems, this variable is "DisableSubsystems", in
DHCPSvr "DisableDHCPD<INTERFACE>".
With "sc enable usb" USB storage devices at permanently inhibited USB interfaces or at
specific host names or IP addresses will be released again.
DHCP synchronization
The synchronization of the DHCP server is switched on and off with "DHCPSync". The
synchronization is only possible in the system network (X120). A priority can also be
specified. -LOW, -HIGH or -MASTER.
The priorities have the following effect for the synchronization of the DHCP server:
● MASTER: The computer node will become an active DHCP server. If several servers
● HIGH: The computer node belongs to the server candidates with high priority, i.e. if no
● LOW: The computer node belongs to the server candidates with low priority, i.e. if no
Note
Recommended settings are:
• DHCP operation and DHCP synchronization are switched on in the system network.
• Exactly one NCU is set as DHCP server.
• Maximum of two computers are candidates with "HIGH" priority.
• All other components are set as DHCP clients or candidates with "LOW" priority.
See also
Parameter "SyncModeDHCPD_SysNet" in the "basesys.ini" file.
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have been configured in the system network, this computer has the highest priority.
server with "MASTER" priority becomes active, then a computer with "HIGH" priority can
be the active server.
server with "MASTER" priority or "HIGH" priority becomes active, then a computer with
"LOW" priority can be the active server.
Commissioning Manual, 03/2013, 6FC5397-1DP40-3BA1
NCU operating system (IM7)