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

Hi Ainuddin,

What you can do is pass this parameter in a calc bloc, and read the quality.  
If quality is bad, for any reason, just output the last good value.

If you take a look at the calc block edoc, (my favorite bloc), you will find 
the instruction for "read quality"

Regards,

Normand


-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On 
Behalf Of Ainuddin Ali
Sent: Thursday, November 05, 2009 10:37 PM
To: foxboro@xxxxxxxxxxxxx
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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