Emerson Exchange 365

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SEQUENCE OF EXECUTION

I have a control logic which controls the automatic operation of a drier unit that is timed. The logic controls the system effectively but my problem is, whenever there is power failure, the logic starts from the beginning.  I use a calc block to constantly move the timer value to a parameter block and restore its value after power is restored, that did not solve the problem.

I need to know if there is a way I can direct the controller to resume execution of the logic at the point before the power failure.

looking forward to your kind suggestions.

Thank you

wiseson

• 31 Oct 2016 11:17 AM
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2 Replies

• JesseMcNeely

  

  • 31 Oct 2016 1:35 PM

  1. You must use a retentive timer not just a normal on delay or timed pulse.
  
  2. Right click on the control module in Deltav explorer and open the properties window. Check the box that says restore parameter values.
  
  3. Go through your sequence and find user defined variables that you would like to restore their values after a cold restart and in their properties window check restore parameter values.
  
  4. You should then be able to download setup data for it to take effect. Or the entire module.

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• wiseson

  

  • 31 Oct 2016 1:41 PM

  In reply to JesseMcNeely:

  Thank you JesseMcNeely for your reply,
  
  I used retentive timer to implement the timing function, and enabled restore parameter values on both the control module and all user defined variables. Yet the problem persist. The controller seems to start executing the module from fresh each time there is power failure.

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