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DVC6200 PD

I am trying to find information on DVC6200 PD execution time (cycle time), can any one advise?

MMoosavinia

• 9 May 2016 12:33 PM
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7 Replies

• Jordan Mandernach

  

  • 10 May 2016 1:38 PM

  Hi, can you please clarify what you are seeking in regards to execution time? What specific details of the instrument are you seeking, and how will this value be used or applied? Also, is this for the HART or Fieldbus instrument? We want to make sure we provide you with accurate information on what you are looking for.

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• MMoosavinia

  

  • 18 May 2016 11:08 AM

  In reply to Jordan Mandernach:

  I am trying to verify the overall control loop performance, I am getting some strange behaviors, and thought to check the execution cycle time of all component in the control loop.

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• Riyaz Ali

  

  • 19 May 2016 5:14 AM

  In reply to MMoosavinia:

  Dear Sir,
  If you are looking for Functional Block Execution time of DVC6200f, such details are available in bulletin D103399X012, which is in public domain.
  For your quick reference, I am listing it below;
  Block Execution Times
  AO Block: 15 ms AI Block: 15 ms
  PID Block: 20 ms MAI BLock: 35 ms
  ISEL Block: 20 ms DO Block: 15 ms
  OS Block: 20 ms DI Block: 15 ms
  In case, if you have furthermore queries, you may please provide me your email address and location, so that our expert in your region can render quick services.
  Thanks and appreciate your query.

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• MMoosavinia

  

  • 19 May 2016 2:41 PM

  In reply to Riyaz Ali:

  Thanks but I am using a DVC6200PD [Performance Diagnostics](4-20mA+HART). as a DVC I guess it is still processing data.

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• MMoosavinia

  

  • 19 May 2016 2:45 PM

  In reply to MMoosavinia:

  mmoosavinia@optimalpressure.com

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• Riyaz Ali

  

  • 19 May 2016 5:00 PM

  In reply to MMoosavinia:

  Generally, microprocessor based devices are pretty fast in crunching the algorithm (in msec). However, please note that these Smart Positioners are mounted on actuator / valve assembly, which has associated mechanical deadband, hysteresis, friction etc., before making change in valve travel based on control signal change.
  
  I am not sure on your objective for the exercise but the dead time and time constant of the control valve depend on the DVC (Digital Valve Controller) tuning. The other major performance parameter of the control valve is the installed process gain, which has nothing to do with the DVC tuning.
  
  Also worth noting is the difference in structure between a DCS PID and the DVC control loop. A DCS PID has one control loop with proportional, integral, and derivative actions on the error or the PV. But the DVC has control loops on position, velocity, and acceleration, so the DVC tuning parameters cannot even be compared to DCS tuning parameters.
  
  As requested earlier, if you could please advise your location, email address, contact details, we can have one of area expert get in touch with you to assist on your needs.

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• Rachelle McWright

  

  • 19 May 2016 6:26 PM

  In reply to Riyaz Ali:

  MMoosavinia, please feel free to use the Private Messaging features in the EE365 community to send this information to Riyaz Ali or any other member of the community. You can always send a private message to community members (unless a user chosen to disable this in their settings) by following these steps:
  
  1. Click on the user's name (next to their avatar)
  2. In the right column of the user's profile page, Click the blue button that reads +CONNECT
  3. In the drop down menu, choose SEND PRIVATE MESSAGE

  Best Regards,

  Rachelle McWright: Business Development Manager, Dynamic Simulation: U.S. Gulf Coast

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