Ams trex™ Device Communicator

Lead set
A cable with two banana plugs to connect the Trex unit to a device.
Link Active Scheduler (LAS)
Glossary
User Guide
September 2021
194
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.
Link Master
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.
Link Master Configuration
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
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.
Offline
The Trex unit is not connected to or communicating with a live device.
Online
The Trex unit is communicating with a live device.
Pairing
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.
Polling
A method of sequentially searching a network to determine which devices are present.