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CHARMs Types

Hi all

I would like to ask about the differences between

CHARMs LS, IS, HSS, Namur, Isolated

Thanks in advance 

• CHARMS

Mahmood AlShafai

• 22 Mar 2019 1:07 PM
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1 Reply

• Rune Reppenhagen

  

  • 25 Mar 2019 5:03 PM

  Mahmood,

  I encourage you to look at the Product Data Sheets in the links below and also DeltaV Books Online for more details on this topic, but here is a brief explanation of the types of CHARMs that you mentioned in your question:

  HSS is a Discrete Output 24V DC High-Side CHARM that provides power on the terminals to open and close a device, such as a solenoid.
  NAMUR is a Discrete Input NAMUR CHARM that is designed to connect to NAMUR compliant sensors and that complies with the fault detection levels defined by NAMUR. This is not Isolated and provides power to the field device.
  Many of our CHARMs are isolated and it basically means that the CHARM isolates the field signals from the DeltaV system. The Discrete Input 24V DC Isolated CHARM is an example of this and as opposed to the DI NAMUR CHARM the DI Isolated CHARM doesn't provide 24V DC to the field device but instead requires externally powered devices or power can be provided through the injected power on the terminal block.

  See more information in the DeltaV Electronic Marshalling PDS

  LS CHARMs are CHARMs used in DeltaV SIS with Electronic Marshalling. They are connected to a CSLS (CHARMs Smart Logic Solver) instead of to a CIOC (CHARM I/O Card).

  See more information in the DeltaV SIS with Electronic Marshalling PDS

  IS CHARMs are Intrinsically Safe CHARMs that have built-in galvanic isolation for intrinsic safe applications. They are available both for DCS and SIS.

  See more information in the DeltaV IS Electronic Marshalling PDS and in the DeltaV SIS with IS Electronic Marshalling PDS

  Best regards,
  Rune

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