Emerson 375 User Manual page 125

G-v
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.
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.
Link Master
A Link Master device controls when devices access the fieldbus and
executes the link schedule, which synchronizes communications with
function block execution on the fieldbus. The H1 card or any field 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.
Link Scheduling time
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.
Online Licensing
A feature in the Easy Upgrade Programming Utility to select and download
new licenses that enable additional functionality in the 375 Field
Communicator. You can order and download licenses for the F
OUNDATION
fieldbus application, Easy Upgrade option, and the Graphics option. The 375
Field Communicator must be licensed for the Easy Upgrade option before
you can download licenses for the F fieldbus application or the
OUNDATION
Graphics functionality. See the Easy Upgrade Programming Utility online
Help for more information.