252 Rockwell Automation Publication 1756-UM058G-EN-P - November 2012
Glossary
minor revision A module revision that is updated any time there is a change to the module that
does not affect its function or interface.
multicast Data transmissions that reach a specific group of one or more destinations.
multiple owners A configuration set-up where multiple owner-controllers use exactly the same
configuration information to simultaneously own an input module.
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.
run mode In this mode, the following events occur:
• Controller program is executing
• Inputs are actively producing data
• Outputs are actively controlled
service A system feature that is performed on user demand, such as fuse reset or
diagnostic latch reset.
system side Backplane side of the interface to the I/O module.
tag A named area of the controller’s memory where data is stored.
timestamping A ControlLogix process that stamps a change in input data with a relative time
reference of when that change occurred.
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