“Section 7.3.4 of version 3521-2013 describes the redundancy testing for the DCS CPU; this can be carried out through the status indicator lights on the cards, as well as...
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DCS system redundancy testing: How to determine the progress of the redundancy process by using the status indicator lights of the cards
Redundancy generally supports hot swapping, if it is hot-swappable. The testing method is to simply plug in and pull out; for the controller, card keys, power redundancy, one of the circuits is turned off