Instruction Manual

162 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013
Glossary
node The connection point at which media access is provided.
output device 1) For a computer, a CRT terminal or printer. 2) For a programmable controller,
see actuator (
page 157).
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 (
page 159) and
interval (
page 161).
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
(
page 161).