Emerson AMS Trex Device Communicator User Manual page 195

User Guide
Link Master
Link Master Configuration
Link Scheduling time
Offline
Online
Pairing
Polling
Positioner
Process variable
Segment (fieldbus only)
Shortcut bar
Shout/deaf mode
Slot time
User Guide
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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.
A digital valve positioner.
A process parameter that is being measured or controlled (for example, level, flow,
temperature, mass, or density).
The section of a fieldbus that is terminated in its characteristic impedance. Segments are
linked by repeaters to form a complete fieldbus.
The shortcut bar displays settings and information about the Trex unit, including viewing
version numbers for the Trex unit and setting the screen brightness.
A communication mode where the amplitude of the signal is increased. The Trex unit
determines when to enter this mode. The icon (with a solid or hollow heart) indicates
when the Trex unit is in this mode.
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Glossary
September 2021
195