Rockwell Automation Publication 1756-UM058G-EN-P - November 2012 251
Glossary
broadcast Data transmissions to all addresses or functions.
change of state (COS) Any change in the ON or OFF state of a point on an I/O module.
communication format Format that defines the type of information transferred between an I/O module
and its owner-controller. This format also defines the tags created for each I/O
module.
compatible match An electronic keying protection mode that requires that the physical module and
the module configured in the software to match according to vendor and catalog
number. In this case, the minor revision of the module must be
greater than or equal to that of the configured slot.
connection The communication mechanism from the controller to another module in the
control system.
coordinated system time (CST) Timer value which is kept synchronized for all modules within a single
ControlBus chassis.
direct connection An I/O connection where the controller establishes an individual connection
with I/O modules.
disable keying An electronic keying protection mode that requires no attributes of the physical
module and the module configured in the software to match.
download The process of transferring the contents of a project on the workstation into the
controller.
electronic keying A feature where modules can be requested to perform an electronic check to
make sure that the physical module is consistent with what was configured by the
software.
exact match An electronic keying protection mode that requires the physical module and the
module configured in the software to match according to vendor, catalog
number, major revision and minor revision.
field side Interface between user field wiring and I/O module.
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
behaves as if the I/O module does not exist at all.
interface module (IFM) A module that uses pre-wired cable to connect wiring to an I/O module.
listen-only connection An I/O connection where another controller owns/provides the configuration
and data for the module.
major revision A module revision that is updated any time there is a functional change
to the module.
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