Rockwell Automation AADvance Controller Safety Manual - Manual (Page 119)

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Document: 553630
ICSTT-RM446K-EN-P Issue: 10
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6-3
Chapter 5 Glossary of Terms
consumer
The consuming controller requests the tag
from the producing controller.
contact
A graphical component of a Ladder Diagram
program, which represents the status of an
input variable.
continuous mode
Where the Safety Instrumented Function in
the Safety System is continually maintaining
the process in a safe state.
controller
A logic solver; the combination of
application execution engine and I/O
hardware.
controller system
One or more controllers, their power
sources, communications networks and
workstations.
coverage
The percentage of faults that will be
detected by automated diagnostics. See also
'SFF'.
creepage distance
The shortest distance along the surface of
an insulating material between two
conductive parts.
cross reference
Information calculated by the AADvance
Workbench relating to the dictionary of
variables and where those variables are used
in a project.
D
data access (DA)
An OPC data type that provides real-time
data from AADvance controllers to OPC
clients.
de-energize to action
A safety instrumented function circuit where
the devices are energized under normal
operation. Removal of power de-activates
the field devices.
dictionary
The set of internal input and output
variables and defined words used in a
program.
discrepancy
A condition that exists if one or more of the
elements disagree.
DITA
Digital input termination assembly.
DOTA
Digital output termination assembly.
E
element
A set of input conditioning, application
processing and output conditioning.
energise to action
A safety instrumented function circuit where
the outputs and devices are de-energized
under normal operation. Application of
power activates the field device.
EUC
Equipment Under Control. The machinery,
apparatus or plant used for manufacturing,
process, transportation, medical or other
activities.
expansion cable assembly
A flexible interconnection carrying bus
signals and power supplies between
AADvance base units, available in a variety
of lengths. Used in conjunction with a cable
socket assembly (at the left hand side of a
base unit) and a cable plug assembly (at the
right hand side of a base unit).
F
fail operational state
A state in which the fault has been masked.
See 'fault tolerant'.
fail safe
The capability to go to a pre-determined
safe state in the event of a specific
malfunction.