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Allen Bradley 1747-L542 CPU Controller SLC 5/04 A-B 1747L542
The primary controller is now acting as the hot redundant controller
(n+1). All old configuration and block output information remains intact
from when it is shut down in Step 2. If the new configuration is not operating
as expected, the primary controller, currently acting as the hot redundant
controller (n+1), can take control using the old configuration and
block output information
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