Private And Public Addressing - ABB XIO-08 User Manual

Dynamic addressing
A device with an enabled DHCP function automatically configures IP parameters. DHCP requests and
obtains the IP parameters for the unit without manual intervention. This is a good option when the device
can connect to a network that has a DHCP server supplying the IP configuration. Network connections
must be reliable because disconnection or network outages cause the controller to lose its IP
configuration. DHCP-obtained IP addresses are public IP addresses valid for connection to the customer
network.
A public address is an address that is valid for the corporate IP address range assigned to a private
customer network. This does not mean it is accessible from outside the customer network. Well-designed
customer networks protect devices from unauthorized users with the use of firewalls and other methods
implemented throughout the network.
IMPORTANT NOTE: The DHCP capability for dynamic Ethernet parameter configuration is
that of a DHCP client, not a DHCP server. If no DHCP server is available on the corporate
network, a local switch/router that supports DHCP can support dynamic addressing. The
switch/router in this case must support the DHCP server function to provide the IP
parameters when the Totalflow device requests them. To support this scenario, enable the
DHCP server function in the router/network equipment before connecting. DHCP adds
options to automate configuration, but carefully consider the reliability of network
connections and the specific scenarios. ABB recommends static IP addressing to ensure IP
configuration is not affected by failure on the network connection or local router.
Static addressing
Manually configured IP parameters do not depend on a connection to a network and DHCP server. IP
parameters remain intact when they are saved in the device. Static IP addresses can be public or private.
Obtain valid IP addresses from the network administrator.
10.2.3

Private and public addressing

Totalflow devices can be configured with private or public IP addresses. Select what is appropriate for the
field conditions.
Private addressing
Private addressing is the default for local connection with hosts (PC or laptop) for device setup,
maintenance or monitoring over Ethernet.
Equipment with Ethernet ports has default private IP addresses configured at the factory. Configure the PC
or laptop with a compatible private IP address to communicate with a device in the field.
IMPORTANT NOTE: All ABB Totalflow devices have the same default address. If a field location
requires network communication, and more than one device is installed at that location, the
default address in each device must be changed to a unique and valid IP address.
Table 10-2 displays common examples of address blocks reserved for private addressing. Consult with the
network administrator for approved configuration and parameters. General IP addressing and information
about other reserved address blocks is available on publicly available Internet sites.
Table 10-2: Reserved private address blocks
Address block type
APIPA
(Automatic Private IP
Addressing, IPv4)
180 | XIO USER MANUAL | 2106424MNAA
Address range Subnet mask
169.254.0.1 to 255.255.0.0
169.254.255.254
Notes
The factory-default IP addresses on
Totalflow devices are from this block:
169.254.0.11.