Problem with CPU 314C-2DP for Redudancy

Dear Experts,

I am facing a problem with CPU 314C-2DP for Redudancy.

In My project I am Using CPU 314C-2DP with CP 343-1 lean. with redundancy,

I have Downloaded the program in both PLCs in stop mode. Then I Put 1 PLC in Run mode. It goes in mode. When I Put another PLC (Redundant) in Run mode Previous PLC Automatically goes to stop mode. Means at a time only one PLC remain in Run Mode.

In Diagnostic buffer I see the error "Stop caused by Priority Class system" and "Area Length Error when reading" Please help me how can I overcome these errors.

Here I have attached the Diagnostic buffer log of the CPU which in STOP mode. Friends please go through it and help me..

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Split from STOP CAUSED BY PRIORITY CLASS SYSTEM.

Hi Niksss,

Are you sure that is a CPU314 or CPU 4xx??

Another issue, when you reestart try to start the redundancy CPUs/System, not the CPUs one by one...