Bradley Smoker 1734-AENT Consumer, Determinism, Time-critical applications, Address, Ethernet

6Preface

This Term	Means
consumer	A destination device in the CIP networking model. See CIP.
CSMA/CD	Carrier sense multiple access/collision detection is the access
	method used in Ethernet. When a device wants to gain access to the
	network, it checks to see if the network is quiet (senses the carrier).
	If it is not, it waits a random amount of time before retrying. If the
	network is quiet and two devices access the line at exactly the same
	time, their signals collide. When the collision is detected, they both
	back off and each waits a random amount of time before retrying.
Determinism	The ability to predict when information will be delivered. Important in
	time-critical applications.
DHCP	The dynamic host configuration protocol is an Internet protocol,
	similar to BootP, for automating the configuration of computers that
	use TCP/IP. DHCP can be used to automatically assign IP addresses,
	to deliver IP stack configuration parameters, such as the subnet mask
	and default router, and to provide other configuration information,
	such as the addresses for printer, time, and news servers.
	The 1734-AENT factory default is DHCP enabled. When you apply
	power, the module sends a message containing its hardware address
	to any DHCP server on the network. The server(s) replies by sending a
	message with an appropriate IP address for the adapter. The adapter
	responds by acknowledging to a server that it will use the offered IP
	address.
DNS	The domain name system is a hierarchical, distributed method of
	organizing the name space of the Internet. The DNS administratively
	groups hosts into a hierarchy of authority that allows addressing and
	other information to be widely distributed and maintained. A big
	advantage to the DNS is that using it eliminates dependence on a
	centrally-maintained file that maps host names to addresses.
Ethernet	A physical layer standard using carrier sense multiple access with
	collision detection (CSMA/CD) methods.
EtherNet/IP	Ethernet industrial protocol applies a common application layer (CIP)
	over Ethernet by encapsulating messages in TCP/UDP/IP.
Ethernet network	A local area network designed for the high-speed exchange of
	information between computers and related devices.
Explicit messaging	Non-time critical messaging used for device configuration and data
	collection, such as downloading programs or peer-to-peer messaging
	between two PLC units.
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	A fully qualified domain name (FQDN) is a domain name that includes
domain name	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.

Publication 1734-UM011C-EN-P - January 2006