Rockwell Automation Publication ICSTT-RM448M-EN-P - February 2021 139
coding peg A polarization key, fitted to the T9100 processor base unit and to each
termination assembly, which verifies that only a module of the correct type
may be fitted in a particular slot. Part number T9903.
coil In IEC 61131-3, a graphical component of a Ladder Diagram program, which
represents the assignment of an output variable. In MODBUS language, a
discrete output value.
Compiler Verification Tool (CVT) An automatic software utility that validates the output of the application
compilation process.
configuration A grouping of all the application software and settings for a particular
AADvance controller. The grouping must have a 'target', but for an AADvance
controller it can have only one 'resource'.
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
computers.
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 software or AADvance®-
Trusted
® SIS Workstation software 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.
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