Re: [foxboro] Bad Value Status and HLBL
- From: "Douglas G. Lloyd" <DGLControls@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Mon, 24 Apr 2006 17:03:43 -0400
Jerry,
You can add an extension to the sequence block User Label reference to
examine the quality status (i.e. ".BAD", ".OOS", ".ERROR", etc) of the
retrieved value. Check out the B0193AV Chapter 8 Sequence Logic reference.
If the retrieved status is BAD (or otherwise not as you need it...), you can
write a simple check to not store the new value and retain the previous good
value.
Regards,
Doug Lloyd
DGL Controls
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Jerry Hidahl
Sent: Monday, April 24, 2006 4:09 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Bad Value Status and HLBL
Hi, Everyone.
I've got a problem where a sequence program (HLBL) is getting an external
real value from a SWCH block storing it to a dependent block parameter. The
value includes error status which is also being stored. That's okay, so
far. The problems occur when a host program, the IADriver task for FoxBatch
(original version) attempts to read the occasional bad value and fails. I
need to find a way to detect the error status of the value within the
sequence program, and either strip it off or just avoid assigning the
value.
I've looked through the documentation available to me and found no clues.
Does anyone out there have any ideas for detecting error status in real
values within a sequence program?
Jerry Hidahl
Huntsman Corp.
Port Neches, TX
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