This read-write enabled/disabled flag controls whether the PDU generates a notification whenever a PDU in its daisy chain changes role (for example, from secondary to primary). An admin enables this to catch unexpected chain-role failovers, which often indicate the previous primary unit failed or was rebooted. For instance, if the primary PDU in a chain lost power and an alternate took over as primary, this setting ensures that role transition is flagged rather than happening silently.