Allen-Bradley 1788-CN2FFR, Руководство пользователя, Страница: 45 / 104

Rockwell Automation Publication 1788-UM057B-EN-P - September 2014 43
Set Up in the Studio 5000 Logix Designer Application Chapter 2
Scheduling and the LAS The 1788-CN2FFR/1788-EN2FFR linking device generates the LAS schedule,
which determines when each function block executes and transmits data. Newly
added field devices are automatically added to the schedule, and removed from
the schedule when removed from the live list.
Figure 7 - Master Configuration Dialog Box
The Download Schedule function is only needed when the 1788-CN2FFR/
1788-EN2FFR linking device has been replaced.
Redundant Master Setup You can configure a second 1788-CN2FFR/1788-EN2FFR linking device to act
as a backup. You can choose from various architectures (see
Appendix D ). The
figure shows an example of MultiMaster architecture, A bus only, with a shared
termination.
IMPORTANT
When connecting to running linking devices, you must follow the procedures
in
MultiMaster Connecting Procedures on page 46 to avoid losing the
connection to certain devices.
IMPORTANT
You must not have any other back-up LAS devices. Be sure that the field devices
have been configured with the class set to basic. See
Field Device Class on
page 42 .
IMPORTANT
Test and verify that the specific field devices that are connected to the
MultiMaster operate correctly when one of the linking devices fails.