Loss program controllers PM866
I have a redundant system with 2 PM866 controllers, 1 BC810 modules, 2 CI854 modules, 2 CI867 modules for each controller, every week the controllers go to failure and lose communication with the DCS system, also the controllers lose the program, because when I restart the controllers and when trying to go online, I get an error message indicating that it is not possible to go online because there is no program in the controllers.
The CPU load is less than 90% just like heap utilization
Have you pulled & examined the controller logs?
The AC 800M may delete the application for natural reasons; e.g. abnormal shutdown/reset (e.g. due to network induced CPU overload) or 24V power loss without a backup battery. The external SB822 battery is recommended over using the internal or SB821 external battery. The two latter suffer from known lithium oxide barrier problems (the very same feature making lithum batteries excellent for use in smoke detectors).