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???
05/30/08 05:58
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 		 #155276 - Is this feasible
Responding to: ???'s previous message
Hi;
My dirty mind was wanderning in all directions to have a system like this.
I planned to use the concept of shared memory between 2 processors. In that I will be updating a flag for fixed duration of time or after each execution. My second controller will be checking the status of that flag in same duration of time. If the 1st processor fails, this flag needs to be updated, which will be read by the 2nd one.In the shared memory both will be accessing the same values of some registers. So the 2nd can take these values and continue. Is it feasible?

thanks for all your response.

List of 32 messages in thread
TopicAuthorDate
stanby controller for emergency            01/01/70 00:00      
   ALE pulse            01/01/70 00:00      
   What are the expected problems?            01/01/70 00:00      
   The problem here is...            01/01/70 00:00      
      What about processing speed            01/01/70 00:00      
         processing speed should not be an issue            01/01/70 00:00      
   How do you know if it has failed?            01/01/70 00:00      
      my querry            01/01/70 00:00      
         Use a watchdog            01/01/70 00:00      
            I think watchdog not suitable            01/01/70 00:00      
               watchdog            01/01/70 00:00      
                  if it is critical system            01/01/70 00:00      
               Backup controllers            01/01/70 00:00      
         does that going to help            01/01/70 00:00      
            Where are erik and Andy            01/01/70 00:00      
               Irrespective....            01/01/70 00:00      
                  What you say is correct            01/01/70 00:00      
                     engineering procedure            01/01/70 00:00      
               Where are erik and Andy - asleep            01/01/70 00:00      
   much simpler            01/01/70 00:00      
   always operating or failsafe            01/01/70 00:00      
   Have you considered this ...            01/01/70 00:00      
      there is always a gotcha            01/01/70 00:00      
         Yes, but it always depends ...            01/01/70 00:00      
            hardware description is needed            01/01/70 00:00      
               Is this feasible            01/01/70 00:00      
                  No,            01/01/70 00:00      
                  You have reinvented a watchdog            01/01/70 00:00      
                     this is running in circles because ....            01/01/70 00:00      
                        Nothing's perfect            01/01/70 00:00      
                           not if you are only concerned with hardware failur            01/01/70 00:00      
                              it's all about testing            01/01/70 00:00      

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