Rockwell Automation 1785-L20C_L40C, D17856.5.14 ControlNet PLC-5 Programmable Controllers User Manual - Manual (Page 6)

Preface
Using This Manual
ii
Term Description
ControlNet network communication architecture that allows the exchange of data between AllenĆBradley Company,
Inc. products and certified thirdĆparty products
connection opened communication path between two nodes on a ControlNet network
discrete I/O data transfer type of data transfer in which single units of I/O have discrete relationships with values in the
processor's data table; uses the processor's inputĆ and outputĆimage tables (I and O files);
configured on a perĆnode basis in the ControlNet I/O map table
frame single data transfer on a ControlNet link
drop cable cable that connects a ControlNet node to the trunk cable; integral part of 1786 taps
I/O map table table that you configure using the programming software to map data from an I/O chassis and
other devices on the ControlNet network to particular dataĆtable file addresses
link collection of ControlNet nodes with unique network addresses in the range of 01Ć107; segments
connected by repeaters make up a link; links connected by bridges make up a network
mapĆtable entry one entry in the I/O map table that you configure using the programming software to map data
from one I/O chassis or other device on ControlNet to particular dataĆtable file addresses
maximum scheduled node node with the highest network address that can use scheduled time on a ControlNet link
maximum unscheduled node node with the highest network address that can use unscheduled time on a ControlNet link
network access port (NAP) port that provides a temporary ControlNetĆnetwork connection through an RJĆ45 connector
network address node's address on the ControlNet network
network update interval (NUI) single occurrence of the ControlNet Network Update Time (NUT)
network update time (NUT) repetitive time interval in which data can be sent on the ControlNet network
node port of a physical device connecting to the ControlNet network that requires a network address
in order to function on the network; a link may contain a maximum of 107 nodes
nonĆdiscrete I/O data transfer type of data transfer in which blocks of data transferred to or from I/O modules use integer input
and output dataĆtable files that you specify; cannot use the processor's inputĆ and outputĆimage
tables (I and O files); scheduled transfers are configured in the ControlNet I/O map table,
unscheduled transfers make use of ControlNet I/O Transfer (CIO) instructions
owner device that controls the outputs of an adapter
redundant media dualĆcable system that allows you to receive the best signal over a ControlNet network
repeater twoĆport active physicalĆlayer device that reconstructs and retransmits all traffic that it hears on
one ControlNet segment to another segment
scheduled transfers deterministic and repeatable transfers that are continuous and asynchronous to the ladderĆ logic
program scan
segment trunkline section of ControlNet network with terminators at each end; a segment does not
include repeaters; segments connected by repeaters make up a link
tap component that connects products to the ControlNet trunk cable; a tap is required for each node
and for each side of a repeater
terminator 75W resistorĊmounted in a BNC plugĊplaced on each end of a ControlNet segment to prevent
reflections from occurring at the ends of the cable
trunk cable bus or central part of the ControlNet cable system
trunkĆcable section length of trunk cable between any two ControlNet taps
unscheduled transfers nonĆdeterministic data transfers through ladderĆinitiated communication or programming devices
Terminology