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Glossary
These terms and abbreviations are used throughout this manual. For
definitions of terms not listed here, refer to the Allen-Bradley Industrial
Automation Glossary, publication AG-7.1.
Broadcast
Data transmissions to all addresses
Communications 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 the physical module and
the module configured in the software to match according to vendor, catalog
number and major revision. 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
ControlLogix® backplane chassis. The CST is a 64 bit number with s
resolution
Direct connection
An I/O connection where the controller establishes an individual connection
with I/O modules
Disable keying
Option that turns off all electronic keying to the module. 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 system feature which makes sure that the physical module attributes are
consistent with what was configured in the software
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
Field side
Interface between user field wiring and I/O module
High Resolution Frequency Mode
Operational mode in which CFM module measures incoming pulses over a
user-defined time period up to 2 seconds
Inhibit
A ControlLogix process that allows you to configure an I/O module but prevent
it from communicating with the owner controller. In this case, the controller
does not establish a connection
Listen-only connection
An I/O connection that allows a controller to monitor I/O module data without
owning the module
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
Rockwell Automation Publication 1756-UM010C-EN-P - June 2021
139
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