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Anonymous Poster

Signal

03/31/2009 5:14 AM

I want to tie some of the diagnostic alarm to our safeguarding PLC for predictive/proactive maintenance purpose.

Now, the question is, if the mA is between 2.51-2.99 mA, what should be the status. Is it dirty optic or block?

We cannot configure comparator in the logic such that it will only give dirty optic alarm when the signal =3 mA and alarm will be clear if the mA drop below 3 mA but still higher than 2.5 mA.Please help me On This.

E&I Engineer
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PWSlack
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#1

Re: Signal

03/31/2009 5:25 AM

On the basis of what has been posted so far the logic goes along the lines of :

  • if (signal value < -6.25% of range) then (alarm condition 1) else (no alarm condition 1)
  • if (signal value < -9.375% of range) then (alarm condition 2) else (no alarm condition 2)

Then call out the instrument technician using the basis of the alarm conditions as guidance for that individual.

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