Rockwell Automation 1756-ENET/B ControlLogix Ethernet Communication Interface Module User Manual - Manual (Page 14)

Publication 1756-UM051B-EN-P - November 2000
P-8 About This User Manual
IP address 32-bit identification number for each node on an Internet
Protocol network. These addresses are represented as four sets
of 8-bit numbers (numbers from 0 to 255), with periods between
them. Each node on the network must have a unique IP address.
latency The time between initiating a request for data and the beginning
of the actual data transfer.
module address A six-bit number used to uniquely identify any module on the
local and extended ControlLogix backplane.
multicast In the CIP producer/consumer model one producer multicasts
(broadcasts) the data once to all the consumers.
producer The source of information in the CIP networking model. See CIP.
rack A physical and logical collection of application modules sharing
a common power supply and backplane for module to module
communication.
star configuration A network configuration in which the devices are connected to a
central hub or switch.
subnet mask An extension of the IP address that allows a site to use a single
net ID for multiple networks.
switch A network device that cross connects devices or network
segments. A switch provides each sender/receiver the full
network bandwidth (2x in full duplex mode), reduces collisions,
and increases determinism.
TCP Transport Control Protocol. More reliable but slower transport
protocol than UDP. Used for explicit (not time critical) messaging
in Ethernet/IP.
TCP/IP Transmission Control Protocol/Internet Protocol (TCP/IP). A
transport-layer protocol (TCP) and a network-layer protocol (IP)
commonly used for communication within networks and across
internetworks.
transaction An exchange of request and data and response and data.
UDP User Datagram Protocol. Transport protocol that provides a
very simple, but fast capability to send datagrams
between two devices. Used for I/O (implicit) messaging in
Ethernet/IP.
This term Means