Emerson AMS Trex User Manual page 204

Glossary
HART device
HART loop
HART protocol
HART tag
Intrinsic Safety (IS)
Intrinsic Safety
barrier
Lead set
Link Active Scheduler
(LAS)
Link Master
Link Master
Configuration
Link Scheduling time
Offline
Online
Pairing
Polling
196
attach the FOUNDATION fieldbus Power Plug to the FF pwr terminal and to the
positive (red) FF terminal on top of the lead set.
A device that communicates information using the HART protocol.
A network that combines an analog signal and digital signal to communicate the
process variable and additional device diagnostics in a master/slave configuration.
The network must have HART or HART-compatible devices and the proper amount
of impedance, which may vary based on the device and network configuration.
Highway Addressable Remote Transducer communication protocol. An industry-
standard protocol for digitally enhanced 4-20 mA communication with devices.
An 8-character field used to identify a device. A 32-character long tag is also
possible with HART Universal Revision 6 or higher devices. This field is stored in the
HART device and can be modified.
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.
It is 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.
A physical entity that limits the current and voltage into a hazardous area to satisfy
Intrinsic Safety requirements.
A cable with two banana plugs to connect the Trex unit to a device.
The bus arbiter for the fieldbus 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.
A Link Master device controls when a device accesses the fieldbus segment and
executes the link schedule, which synchronizes communications with function
block execution on the fieldbus. The H1 card or any device that supports Link
Master functionality can function as a Link Master device. Only one Link Master
device can be active at a time on the fieldbus segment. This device is called the
LAS.
An option to set a device as a basic or link master device. Only devices that are
capable of being a Link Active Scheduler have this option.
Link Scheduling time is a link-specific time represented as an offset from Data Link
Time. It is used to indicate when the LAS on each link begins and repeats its
schedule. System management uses it to synchronize function block execution
with the data transfers scheduled by the LAS.
The Trex unit is not connected to or communicating with a live device.
The Trex unit is communicating with a live device.
Associating an AMS Trex unit with an AMS Device Manager database using USB.
Once paired, an AMS Trex unit can synchronize device data with AMS Device
Manager. A Trex unit can be paired to one AMS Device Manager system.
A method of sequentially searching a network to determine which devices are
present.
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