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

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


To
foxboro@xxxxxxxxxxxxx
cc

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


 
 
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
 



 
 
_______________________________________________________________________
This mailing list is neither sponsored nor endorsed by Invensys Process
Systems (formerly The Foxboro Company). Use the info you obtain here at
your own risks. Read http://www.thecassandraproject.org/disclaimer.html
 
foxboro mailing list:             http://www.freelists.org/list/foxboro
to subscribe:         mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe:      mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave

Other related posts: