Emerson Exchange 365

Control Studio, dashes wires vs solid?

I can't find anything in the help system. is it a true/false indicator? I am only on offline edit mode using DVSimulate.

Nova5

• 11 Jan 2016 10:33 PM
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4 Replies

• Nova5

  

  • 11 Jan 2016 10:36 PM

  Nevermind... Found it.
  Feedback Wires — Wires that carry feedback signals in function block diagrams are displayed as dashed lines. Feedback wires are determined when a module is saved or when the function block execution order is set.

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• Matt Stoner

  

  • 12 Jan 2016 12:36 AM

  In reply to Nova5:

  Nova5,
  
  I would be careful using the term feedback because if the blocks don't execute in a certain order, the feedback signal could actually be solid and an input signal dashed.
  
  I would remember that a dashed line means that the data will be from the last scan of the module. Solid line means the data will be from the current scan of the module.
  
  Regards,
  Matt

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• Nova5

  

  • 13 Jan 2016 8:41 PM

  In reply to Matt Stoner:

  That line came from the DeltaV built in help system.

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• Ben Bishop

  

  • 13 Jan 2016 9:11 PM

  Most commonly you would see dashed lines when a BKCAL_OUT parameter from a downstream function block is passed to the BKCAL_IN of an upstream function block. This "feedback" is an important part of obtaining bumpless transfer in cascaded control. If you have a dashed line going from an "upstream" function block to a "downstream function" based on the visual appearance in Control Studio, you may need to check your function block execution order for the reasons that Matt mentioned.

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