156 Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019
Glossary
D
data access (DA) An OPC data type providing real-time data from AADvance controllers to
OPC clients.
de-energize to action An output circuit for a safety instrumented function where the field device is
usually energized. Removal of power de-activates the device.
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 elements disagree.
DITA Digital input termination assembly.
DOTA Digital output termination assembly.
E
element A set of input conditioning, application processing and output conditioning.
energize to action An output circuit for a safety instrumented function where the devices are
usually de-energized. Application of power activates the field device.
EUC Equipment under control. The machinery, apparatus or plant used for
manufacturing, processing, 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 with a cable socket
assembly (at the left side of a base unit) and a cable plug assembly (at the right
side of a base unit).
F
fail operational state A condition where a fault has been masked. See 'fault tolerant'.
fail safe The ability to go to a pre-determined safe condition when a specified
malfunction occurs.
fault reset button The momentary action push switch on the front panel of the 9110 processor
module.
fault tolerance The ability of a system to operate correctly with a specified number of
hardware and software faults.
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