Re: [foxboro] how to prevent IOBAD during PT online calibration

Dirk and Normand
Many thanx for helping - this is exactly what i want to achieve !!

Regards.

On Fri, Nov 6, 2009 at 7:47 PM, <dirk.pauwels@xxxxxxxxxx> wrote:

> Hi Ainuddin,
> If it's for calibration purposes you can get rid of the IOBAD by setting
> the IOMOPT to 0 or 2. This means the block is no longer connected to the
> field measurement and you can enter a safe value in the meas.
>
> another thing we do if we have ie 2 measurements, and one of the 2 needs
> calibrating we tie the good one to the meas of the bad one and set the
> iomopt of the bad one to 2, this way both measurements seem ok to the DCS
> and we can calibrate the bad sensor.
>
> Don't know of this is what you wanted to hear though....
>
> Rgds,
>
> Dirk Pauwels - DCS/MOC coordinator
> Engineering dept.
> Hexion Specialty Chemicals
> E mail: dirk.pauwels@xxxxxxxxxx
> T.  +32.(0)3.570.95.97
> F.  +32.(0)3.570.16.09
> Mob. +32.(0)497.428.300
>
>
>
> Ainuddin Ali <ainuddin@xxxxxxxxx>
> Sent by: foxboro-bounce@xxxxxxxxxxxxx
> 06/11/2009 04:37
> Please respond to
> foxboro@xxxxxxxxxxxxx
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> To
> foxboro@xxxxxxxxxxxxx
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> Subject
> [foxboro] how to prevent IOBAD during PT online calibration
>
>
>
>
>
>
> hi sir
> is there i can do to prevent FBM to report IOBAD during online PT
> calibration. this PT is very critical as it is meant for gas metering -
> therefore it's subjected to quarterly calibration. most of the time - it
> has
> to be carried out during plant running. is it possible to configure ECB
> block so that it will be have like PLC ie. it will store "last good value"
> rather than IOBAD.
>
> AINUDDIN ALI
> CONTROL ENGINEER
> PRAI POWER PLANT
> 350MW CCGT SINGLE SHAFT
>
>
>
>
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