Re: [foxboro] 1-5ma input on a FBM201

Peter,

It seems to me that you could do it with two AINs. I think there are two
approaches that would work, but I can't try them. As they said in my old
math texts, the proof is left to the student. :)


Option 1 - Scaled counts
Create two AINs. The first has IOMOPT=3D1 and is used to read your
physical input. Use the scaling factors on the block to change the raw
counts so that whatever you get at 5ma is scaled to 64,000.

Connect that block's output to the MEAS of the second AIN (IOMOPT=3D0). I
think it will behave as you desire.


Option 2
Create two AINs. The first has IOMOPT=3D1 and is used to read your
physical input and scale 0-5ma as you want it in engineering units.

The second AIN would have IOMOPT=3D2 and take in that measurement. If you
set the scales properly, I think the OSV/BAD will kick in.


Of course, free advice is worth what you pay for it. :)

Regards,
 =

Alex Johnson
Invensys Process Systems
10900 Equity Drive
Houston, TX 77041
713 329 8472 (voice)
713 329 1600 (switchboard)
713 329 1700 (fax)
alex.johnson@xxxxxxxxxxxxxxxx
 =


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Bruley, Peter T
Sent: Tuesday, April 29, 2008 3:44 PM
To: Foxboro@Freelists. Org (foxboro@xxxxxxxxxxxxx)
Subject: [foxboro] 1-5ma input on a FBM201

Gentlemen:
        I am trying to use a FBM201 to measure 1-5ma input.

        I am using an AIN & can scale the output to read 0-100% for
1-5ma in however I don't get the OOS/BAD i/o bits set when I go
over/under the OSV

        The AIN block doesn't have a SCI for:  Linear 3200 to 1600 ( 1
to 5 mA)

        Is there any way to set the raw counts scale in the AIN block
manually?


Thank You,

Peter Bruley

Plant Process Computer Analyst
Xcel Energy - Sherco Generating Plant
13999 Industrial Boulevard
Becker, MN, 55308
(763) 261-3821
Peter.T.Bruley@xxxxxxxxxxxxxx



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