Emerson 475 User Manual page 120

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Instantiation
Some F fieldbus devices support instantiation of function or
OUNDATION
transducer blocks in the device. This means the device allows a
command to be sent to it that will create (instantiate) additional
function or transducer blocks in the device. After instantiation, these
blocks operate like any other block in the device. The 475 Field
Communicator supports the commands to instantiate and to delete
function and transducer blocks in a fieldbus device.
Internal Flash
Non-volatile memory that stores the operating system, application
software, internal device configurations, Event Captures, fieldbus
statistics, and user generated text files.
Intrinsic Safety (IS)
Circuits that are designed to limit the amount of energy consumed or
provided to devices to levels below those that are required to ignite
specific types of hazardous materials under fault and no fault
conditions.
Also a method of providing safe operation of electronic process-control
instrumentation in hazardous areas, such as flammable environments.
IS systems keep the available electrical energy in the system low
enough that ignition of the hazardous atmosphere cannot occur.
Intrinsic Safety barrier
A physical entity that limits the current and voltage into a hazardous
area in order to satisfy Intrinsic Safety requirements.
IrDA
Infrared Data Association, a non-profit trade association that
establishes standards for infrared communications between devices
such as personal computers, printers, and handheld devices.
The 475 Field Communicator can use an IrDA adapter to communicate
with the Field Communicator Easy Upgrade Utility or AMS Device
Manager.
Lead set
A cable with two 4mm banana plugs used to connect to a device.
Link Active Scheduler (LAS)
The bus arbiter for the segment. The LAS recognizes and adds new
devices to the link, removes non-responsive devices from the link, and
distributes Data Link (DL) and Link Scheduling (LS) time on the link.