Instruction Manual

Rockwell Automation Publication 1769-UM006E-EN-P - July 2013 161
Glossary
intelligent I/O module 1) An I/O module that provides some on-board processing of input values to
control some output values without going through the data table for control by
the ladder logic. An intelligent I/O module can have digital I/O circuits, analog
I/O circuits, or both. 2) Contrasted with direct I/O module (
page 159).
interval 1) The length of time between events or states. For example, the length of time
between when a signal is high can be described as the interval between pulses. 2)
Compare duration (
page 159) and period (page 162).
I/O module 1) In a programmable controller system, a module (interchangeable plug-in item
within a larger assembly) that interfaces directly through I/O circuits to the
sensors and actuators of the machine/process.
isolated I/O module A module that has each input or output electrically isolated from every other
input or output on that module.
jumper A short conductor with which you can connect two points.
k Kilo. A prefix used with units of measurement to designate a multiple of 1000.
keying Devices that let only selected pairs of mating connectors be plugged into each
other.
listen-only connection An I/O connection that lets a controller monitor I/O module data without
owning the module.
local I/O 1) I/O connected to a processor across a backplane or a parallel link, thus limiting
its distance from the processor. 2) Contrasted with remote I/O (
page 162).
major revision A module revision that is updated any time there is a functional change to the
module resulting in an interface change with software.
minor revision A module revision that is updated any time there is a change to the module that
does not affect its function or software user interface.
module slot A location for installing a module. In typical modular construction, modules plug
into a backplane; each module slides into a slot that lines it up with its backplane
connector.
multicast Data transmissions which reach a specific group of one or more destinations.
network update time (NUT) The smallest repetitive time interval in which the data can be sent on a
ControlNet network. The NUT can be configured over the range from
2 ms…100 ms by using the RSNetWorx software.