Allen-Bradley 1756-CNB/E, User Manual

Page: 142 / 186

Publication 1756-UM523F-EN-P - December 2006
142 Update Modules and Redundant Systems
8. Initiate a switchover.
A. Click Initiate Switchover and Yes.
B. Wait for the system to switchover.
The other chassis is now the primary chassis.
9. Update the modules in the new
secondary chassis.
Use the ControlFLASH firmware update tool to update the modules in the new secondary
chassis.
10. Prepare the RSLogix 5000 project for the
update.
A. Start RSLogix 5000 software and go online to the primary controller.
B. Set the watchdog time for each task to this value or more:
Minimum watchdog time
=
(2 *maximum_scan_time) + 150 ms
where:
Maximum_scan_time
is the maximum scan time for the entire task when the
secondary controller is synchronized.
C. Cancel or assemble any test edits.
D. Remove all SFC forces from the project.
E. Make sure that you do not need to make any changes to:
You can make those changes again when the update is done and both chassis
synchronize.
F. Save the project.
Action Details
•
I/O Forces — Once you start this procedure, you will not be able to disable
or enable I/O forces until you update both chassis.
•
I/O configuration