Allen-Bradley ControlLogix 1756-ENBT, User Manual

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Publication 1756-UM050A-EN-P - December 2001
Glossary 4
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.
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.