Allen-Bradley ControlNet PLC-5, Руководство пользователя

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Publication 1785-6.5.24 February 1999
3-12 Installing and Configuring Your ControlNet PLC-5 Backup System
9. Save the configuration.
10. Repeat steps 1 through 9 for the second processor, saving the
configuration under a different name.
The QUAL LED on both processors should now be yellow, and
you have a fully qualified backup system. If desired, you can
now go to Run mode.
Advanced Configuration Options
The procedures in the previous sections outlined the steps required to
configure a basic ControlNet PLC-5 backup system. In addition,
there are other options you can configure for the backup system. In
addition to the information provided here, you can find specific
details on these features in the appendices of this manual.
• Designated Primary - allows you to force the processor at the
odd node address to always be the primary PLC processor as long
as that processor is in Run mode and is qualified.
You can select the designated primary option from the
Configuration tab of the ControlNet Hot Backup screen in
RSLogix 5. Simply choose the Odd PLC Node from the
Designated Primary pull-down menu.
Note: You must make this selection for both processors, and they
must be in Program mode.
• Synchronous and Asynchronous modes - provide you with the
opportunity to choose synchronous or asynchronous program
scanning for your backup system.
• Equivalence Checking - when enabled, equivalence checking is
the performance of verification checks to ensure the qualifying
secondary matches the primary. The current equivalence status of
the two processors is displayed.
Note: If Equivalence checking is enabled during qualification
and differences are found, a major fault will occur.
• Crossloading - allows you to perform an on-demand transfer of
data files from the primary to the secondary processor
• Forced Switchover - allows you to force the primary processor
to secondary, and vice versa, on demand. This option is available
while both PLC processors are in Run mode. To force a
switchover, simply click on the Force Switchover button on the
Configure tab of the ControlNet Hot Backup screen.
• Status - provides you with informational messages and parameter
settings