Re: [foxboro] Warning - potential CALC problems
- From: Walter Scott <wescottal@xxxxxxxxx>
- To: foxboro@xxxxxxxxxxxxx
- Date: Mon, 18 Sep 2006 05:40:20 -0700 (PDT)
FYI
In the Integrated Control and Block Descriptions Manual. there is a table in
the CALCA Block sections that has this information along with the other
differences between a CALC,CALCA,MATH, and LOGIC block
Walter Scott
nick.maher@xxxxxxxxxxxxxx wrote:
I've long thought we should check our Interlocks / PSD's at some
prescribed interval/function of modification.........
Good catch.
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of terry.lloyd@xxxxxxxxxxxxxx
Sent: Monday, September 18, 2006 4:06 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Warning - potential CALC problems
I just wanted to communicate an issue to you that we recently discovered
on our Foxboro system at Dow Corning, Barry. So this note is intended
to raise awareness, share the learning, and alert you to a potential
problem on your own systems.
One of our Systems Engineers came across some CALC blocks that didn't
work as expected. On investigation he found that they had been coded
with dual operands, e.g. OR BI01 BI02. This facility is only available
on the CALCA block, the CALC block will only use the first operand, the
second is treated as a comment - there is no warning when typed in the
ICC.
This meant that several trip group blocks were only grouping half the
inputs!
e.g. OR BI01 BI02 - BI02 is ignored
OR BI03 BI04 - BI04 is ignored
OR 2
OUT BO01
In order to check our complete system I exported the CALC block (>1400
blocks!) out of FoxCAE into a spreadsheet and used some vba to search
for spaces (only one space then ok!)
Regards =20
Terry=20
Terry Lloyd, Systems Engineer
____________________________________________________________
=20
=20
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