Rockwell Automation 1756-XXXX ControlLogix Analog I/O Modules - Manual (Page 391)

Publication 1756-UM009C-EN-P - December 2010 391
Glossary
network update time (NUT)
The smallest repetitive time interval in which the data can be sent on a
ControlNet network. The NUT ranges from 2 ms to 100 ms.
owner-controller
The controller that creates and stores the primary configuration and
communication connection to a module.
program mode
In this mode the following events occur:
• Controller program is not executing.
• Inputs are still actively producing data.
• Outputs are not actively controlled and go to their configured
Program mode.
rack connection
An I/O connection where the 1756-CNB module collects digital I/O words
into a rack image to conserve ControlNet connections and bandwidth.
rack optimization
A communication format in which the 1756-CNB module collects all digital
I/O words in the remote chassis and sends them to controller as a single rack
image.
remote connection
An I/O connection where the controller establishes an individual connection
with I/O modules in a remote chassis.
removal and insertion under power (RIUP)
ControlLogix feature that allows a user to install or remove a module or RTB
while power is applied.
removable terminal block (RTB)
Field wiring connector for I/O modules.
requested packet interval (RPI)
The maximum amount of time between broadcasts of I/O data.