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IO Transfer Fail alarm in Control Module

Hi Everyone,

We have control modules fetching data from SIS and all the modules are assigned to MQ Controller in DCS. This fetched data is used to trigger some control loops outputs to 0. We have observed all the modules in MQ controller have given ''IO Transfer Fail'' alarm. This triggered control loops outputs to 0. Please suggest possible reasons for all control modules in a controller to raise ''IO Transfer fail'' alarm.

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Ravi Chandra Penumarti

• 2 Dec 2021 9:54 AM
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2 Replies

• Stefan Muellner

  

  • 2 Dec 2021 12:27 PM

  Hello.
  
  could you please give some further details:
  
  how do you collect the data from the SIS? CND-block or external reference, ... in the PLS control module? do the data types match?
  how do you write the actions to the OUT-blocks? CAS_IN? REQ_SQ? do you write inside the own control module or to an external one?

  Stefan Müllner
  Senior Plant Engineer - Automation & Systems

  METADYNEA AUSTRIA GmbH
  

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• Ravi Chandra Penumarti

  

  • 3 Dec 2021 4:25 AM

  In reply to Stefan Muellner:

  Dear Stefan,
  Thank you for your response. Please find the required details below:
  1. Data is collected through external reference. Data is either 1 or 0.
  2. Control module that is reading the data from SIS is assigned to one DCS controller (example C9 controller, data is taken through Parameter 1)
  3. An expression is written in target control module as below:
  If Parameter1 =0, then,
  Mode := Man & Output := 0.
  This control module is assigned to C1 controller. There are around 38 nos of modules assigned to C9 controller. Parameters in C9 controller are referred in expressions of different control modules.
  All the modules in C9 controller has thrown ''IO Transfer Fail'' alarm

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