Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module User Manual
Page 120
Publication 1756-UM007C-EN-P - November 2011
120 Glossary
output device 1) For a computer, a CRT terminal or printer. 2) For a programmable
controller, see actuator (
owner-controller The controller that creates and stores the primary configuration and
communication connection to a module.
period 1) The length of time for a cyclical operation to complete one full cycle. For
example, the length of time from one point in a cyclical wave form to the same
point in the next cycle of the wave form. 2) Compare duration (
) and
interval (
).
power supply A device that converts available power to a form that a system can use—
usually converts AC power to DC power.
producer/consumer model Intelligent data exchange system devices in which the HSC module produces
data without having been polled first. Devices that need the data (consumers)
recognize the data they need and consume it. Therefore, data only needs to be
sent out on the network in a single message no matter how large the number
of nodes to which it needs to go.
program mode In this mode, the controller program is not executing. Inputs are actively
producing data. Outputs are not actively controlled and go to their configured
Program mode state.
proximity switch/sensor A switch/sensor that is actuated when an actuating device is moved near it,
without physical contact.
pulse A momentary sharp change in voltage, current, or light from its quiescent
condition.
quadrature Separation in phase by 90°. Used on single channels of feedback devices, such
as encoders and resolvers, to detect the direction of motion.
remote connection An I/O connection where the controller establishes an individual connection
with I/O modules in a remote chassis.
remote I/O 1) I/O connected to a processor across a serial link. With a serial link, remote
I/O can be located long distances from the processor. 2) Contrasted with
local I/O (
).
removal and insertion under power
(RIUP)
ControlLogix feature that lets a user install or remove a module or RTB while
power is applied.
requested packet interval (RPI) A configured parameter that defines when the module will multicast data.
run mode In this mode, the controller program is executing. Inputs are actively
producing data. Outputs are actively controlled.