Emerson PACSystems RX3i User Manual page 23

User Manual
GFK-2409B
With the I/O operating, place CPU A in STOP mode and CPU B in RUN mode.
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Hot Standby Operation
1. Place both CPUs into RUN mode.
2. Make certain that there is only one Master and only one Backup.
3. Make certain that there is no preferred Master.
4. Place CPU B into STOP mode, and then into RUN mode.
5. Make certain that Synchronized Data is transferred properly to CPU B.
6. Transfer Mastership from A to B by placing the CPU A into STOP mode.
7. Make certain that the I/O did not dropout during the transfer.
8. Place CPU A into RUN mode.
9. Make certain that it becomes a Backup properly.
10. Transfer Mastership from B to A by placing the CPU B into STOP mode.
11. Make certain that the I/O did not dropout during the transfer.
12. Place CPU B into RUN mode.
13. Make certain that it becomes a Backup properly.
14. Make certain that Synchronized Data is transferred properly to CPU B.
Step 7 - Debug the System
Use the Max-ON RX3i View Diagnostic Project
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Simplify the System
Here are a few suggestions from other system developers that have worked well.
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Building a Max-ON RX3i Hot Standby Application
Verify that the system input devices return real-time values properly.
Verify that system output devices may be controlled from the Output Reference
Tables.
Restore the PAC View Project from the installation directory into PAC Machine
Edition.
Enter the Ethernet Addresses of PLC A and PLC B into the PAC View Project.
Download and Run the View Project on your workstation.
Examine the Alarm and the Real-time Status displays.
Turn OFF one PLC and troubleshoot the system using the remaining one.
Disable Max-ON RX3i drivers by placing an #ALW_OFF contact prior to the call to
HBR_000. Now determine if input/output devices operate properly. This will require
that you modify the hardware configuration for the Genius bus controllers. Place
them in "Enable at Start". Don't forget to change the configuration to "Disable at
Start" when it is time to place the system into its final, redundant operation.
Chapter 3
Oct 2019
19