PCSD PWM Control vavle and PCSD graphics

Hello,

I have to used on project modified ControlModule from PCSD for PWM control (called _C_PWM_V01). After some minor difficulties I got the block working.
However, after adding a graphic representation to the screen (also from the PCSD library "PCSD_CtrlValve_v01_), the valve is displayed in purple because the ControlModule does not contain an AO block. How do you solve this situation?

Thank you for your experiences.

Take care

Tomas Grepl

• Graphics
• PCSD
• DeltaV

Tomas Grepl

• 16 Sep 2025 3:55 PM
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4 Replies

• Matt Stoner

  

  • 16 Sep 2025 6:07 PM

  Pulse Width Modulation (PWM) is taking a Discrete Output Signal and attempting to make an analog control signal by changing its on/off times based on a duty cycle, its used with a Discrete Valve graphic object typically but not sure how you are using the composite block in your custom control module to know for sure what you can try.

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• Tomas Grepl

  

  • 17 Sep 2025 5:23 AM

  In reply to Matt Stoner:

  I have modified a PWM module for controlling a continuous valve, which is controlled by two Discrete Output signals (respective direction of movement). That is why I would like to use the FacePlate of the continuous valve.
  
  I tried to insert an empty AO block into the ControlModule, but it is not connected to a physical output, so an error is displayed in DeltaV Live. Simulation of the AO block does not help much, the valve on the screen displays an active simulation. So I am thinking about how to get out of this situation.

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• Matt Stoner

  

  • 17 Sep 2025 4:53 PM

  In reply to Tomas Grepl:

  Sounds like you would need to custom build something as I don't believe anything will be developed to address this.

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• Andre Dicaire

  

  • 18 Sep 2025 9:51 PM

  In reply to Matt Stoner:

  As Matt mentions, this is not really Pulse width modulation. I'd say you have two options: Create an PSEUDO_AO Block you can place in your module to work with the existing Valve object you want to use. The other approach is to create a Display object that works with the existing data in your module. I would lean toward a new display object as this is a different device. Let the Control Module do its thing as designed and solve the display issue in the HMI.

  Andre Dicaire

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