Instruction Manual

160 Rockwell Automation Publication 1769-UM006E-EN-P - July 2013
Glossary
electronic keying A system feature which makes sure that the physical module attributes are
consistent with what was configured in the software.
encoder Any feedback element that converts linear or rotary position (absolute or
incremental) into a digital signal.
• Linear encoder—is a feedback element that directly converts linear
position (absolute or incremental) into a digital signal.
• Rotary encoder—is a feedback element that converts rotary position
(absolute or incremental) into a digital signal. Often, the directly measured
rotary position is used to determine a linear position through gearing.
encoder bandwidth An expression for maximum encoder speed in Hz. Can also refer to the maximum
rate at which the control loop can accept encoder signals. The actual bandwidth
of the encoder and the capability of the controller to process encoder signals can
not be the same.
exact match An electronic keying protection mode that requires the physical module and the
module configured in the software to match identically, according to vendor,
catalog number, major revision and minor revision.
factory wiring 1) Wiring completed before the product was shipped from the factory in which it
was built. 2) Contrasted with field wiring (
page 160).
field side Interface between user field-wiring and I/O module.
field wiring 1) Wiring connected by the user after the user receives the product. 2)
Contrasted with factory wiring (
page 160).
hysteresis 1) The effect of residual magnetism whereby the magnetization of a ferrous
substance lags the magnetizing force because of molecular friction. 2) The
property of magnetic material that causes the magnetic induction for a given
magnetizing force to depend upon the previous conditions of magnetization. 3)
A form of nonlinearity in which the response of a circuit to a particular set of
input conditions depends not only on the instantaneous values of those
conditions, but also on the immediate past of the input and output signals.
inhibit A ControlLogix process that lets you configure an I/O module but prevent it
from communicating with the owner controller. In this case, the controller does
not establish a connection.
input See sensor (
page 163).