SB822 Battery back up
Need one clarification.If the situation will be like the 5V power supply to the AC800M controller is OFF and only connection of SB822 is alive.In such condition does the controller will be alive for the period of time as per the back up of SB822 or controller will be switched off after a safe shutdown.
Source: COntrol builder help file.
If i understood your question correctly, 5V power supply of AC 800M controller will be lost when 24V DC power supply is OFF.
Under above condition, controller will not be alive though SB822 connection is available. The battey units SB822/SB821/Internal battery will only back-up memory content. When the power is restored within the battery back-up time, the controller will go to RUN mode automatically by loading the program from memory. No download of application/programs is required.
Hope the above information helps you.