Rockwell Automation 1756-ENET/B ControlLogix Ethernet Communication Interface Module User Manual - Manual (Page 13)

Publication 1756-UM051B-EN-P - November 2000
About This User Manual P-7
Ethernet network A local area network designed for the high-speed exchange of
information between computers and related devices.
Ethernet/IP Ethernet Industrial Protocol. Ethernet/IP applies a common
application layer (CIP) over Ethernet by encapsulating
messages in TCP/UDP/IP.
explicit messaging Non-time critical messaging used for device configuration
and data collection, such as downloading programs or
peer-to-peer messaging between two PLCs.
fast Ethernet Ethernet operating at 100Mbps/second.
full duplex A mode of communication that allows a device to send and
receive information at the same time, effectively doubling the
bandwidth.
fully qualified
domain name A Fully Qualified Domain Name (FQDN) is a domain name that
includes all higher level domains relevant to the entity named. If
you think of the DNS as a tree-structure with each node having
its own label, a Fully Qualified Domain Name for a specific node
would be its label followed by the labels of all the other nodes
between it and the root of the tree. For example, for a host, a
FQDN would include the string that identifies the particular host,
plus all domains of which the host is a part up to and including
the top-level domain (the root domain is always null). For
example, PARIS.NISC.SRI.COM is a Fully Qualified Domain
Name for the host at 192.33.33.109.
gateway A module or set of modules that allows communications
between nodes on dissimilar networks.
host name The Host Name is the unique name for a computer within its
domain. It’s always the first element of a full name, and, with its
domain and top-level domain suffix, creates the unique name of
that computer on the Internet. For example, let’s say the foobar
website is www.foobar.com. The Host Name is “www”, which
is not unique on the web, but is unique within the foobar
domain.
The Host Name can also refer to the Fully Qualified Domain
Name, or in this example, www.foobar.com. Both naming
methods seem to be used interchangeably in various documents.
For the purposes of this document, the Host Name will refer to
the FQDN, or as in this example, www.foobar.com.
hub A central connecting device that joins devices together in a star
configuration. Hubs are generally not suitable for use in I/O
control systems, since they are time critical applications that
cannot tolerate lost packets.
implicit messaging Real time messaging of I/O data.
IP Internet Protocol that provides the routing mechanism for
messages. All messages contain not only the address of
the destination station, but the address of a destination
network, which allows messages to be sent to multiple
networks within an organization or around the world.
This term Means