Allen-Bradley ControlLogix 1756-ENBT, User Manual

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Publication 1756-UM050A-EN-P - December 2001
Glossary 2
Determinism
The ability to predict when information will be delivered. Important in
time critical applications.
DHCP
The Dynamic Host Configuration Protocol (DHCP) 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 TCP/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.
DNS
The Domain Name System (DNS) 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 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.