Emerson 475 User Manual page 105

G-iii
HART protocol
Highway Addressable Remote Transducer communication protocol. An
industry-standard protocol for digitally enhanced 4-20 mA communication with Smart
devices.
HART tag
An 8-character field used to identify a device. A 32-character long tag is also possible
with HART revision 6 or higher devices. This field is stored in the HART device and
can be modified.
Instantiation
Some F fieldbus devices support instantiation of function or transducer
OUNDATION
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.