Rockwell Automation 1785-Lx0C15 ControlNet PLC-5 Programmable Controllers User Manual - Manual (Page 10)

1785-UM022C-EN-P - February 2008
Preface-2
Terminology
Term Description
Actual Packet Interval (API) the actual time it takes for the ControlNet network to update the requested data. The largest
binary multiple of the Network Update Time (NUT), smaller or equal to the Requested Packet
Interval (RPI). For more information, see Scheduled Data-Transfer Operations on a
ControlNet Network on page 2-2.
ControlNet network communication architecture that allows the exchange of data between Allen-Bradley
Company, Inc. products and certified third-party products
ControlNet PLC-5 processors references PLC-5/20C, PLC-5/40C, PLC-5/46C and PLC-5/80C programmable controllers
phase 1.5
connection opened communication path between two nodes on a ControlNet network
DData Input File (DIF) integer file used by ControlNet PLC-5 processors to store discrete and non-discrete input
data. The DIF cannot be forced
Data Output File (DOF) integer file used by ControlNet PLC-5 processors to store discrete and non-discrete output
data. The DOF cannot be forced
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 input- and output-image tables (I and O
files); configured on a per-node 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
(scanlist configuration) 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 data table file addresses
keeper device that stores and distributes ControlNet configuration data to all nodes on the network.
A minimum of one keeper device is required on each ControlNet network.
link collection of ControlNet nodes with unique network addresses in the range of 01-99; segments
connected by repeaters make up a link; links connected by bridges make up a network
map table entry
(scanlist 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 data table file
addresses
network access port (NAP) port that provides a temporary ControlNet-network connection through an RJ45 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)
smallest 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 99 nodes
non-discrete I/O data transfer type of data transfer in which blocks of data transferred to or from a single I/O module use
integer input and output data table files that you specify; 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
processor any one of the ControlNet PLC-5 programmable controllers
redundant media dual-cable system that allows you to receive the best signal over a ControlNet network