Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module User Manual
Page 119
Publication 1756-UM007C-EN-P - November 2011
Glossary
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interval 1) The length of time between events or states. For example, the length of time
between when a signal is high may be described as the interval between pulses.
2) Compare duration (
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 allow only selected pairs of mating connectors to be plugged into
each other.
listen-only connection An I/O connection that allows a controller to 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
(
).
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 may be configured over the range from
2 ms…100 ms by using the RSNetWorx software.
node The connection point at which media access is provided.
off 1) The inoperative state of a device; the state of a switch or circuit that is open.
2) Contrasted with on (
on 1) The operative state of a device; the state of a switch or circuit that is closed.
2) Contrasted with off (