Re: [foxboro] CALC vs. IND question
- From: "mdaatje" <mdaatje@xxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Thu, 27 Mar 2008 21:08:41 +0100
Foxboro has a nice program called "logic view". With this program you can
view CALC/CALCA/MATCH/LOGIC block logic in a graphical way. It is even
possible to extend the input/output labels with own information.
This is a great piece of software that makes the CALC/LOGIC block function
much easier to read and understand.
It is installed so it can be called from the detail display.
Regards,
Martijn Daamen
Sr. DCS application Engineer
----- Original Message -----
From: Jerry Hidahl
To: foxboro@xxxxxxxxxxxxx
Sent: Thursday, March 27, 2008 7:21 PM
Subject: Re: [foxboro] CALC vs. IND question
Comments don't show up very well on the detail display (limited space).
They show up best in the configurator. Needless to say, they don't show up
at all, if no one puts them in. (The same is just as true for any kind of
HLBL block.) Recently, I've made a practice of developing any kind of
CALC/LOGIC/MATH/CALCA block on an Excel spread sheet off-line. It enables
me to put as many comments in as I like, including the various I/O
parameter entries or connections. It also allows me to move steps around to
make room, and to figure out step numbers for branching, before I've coded
anything in the configurator. It's easier to see the big picture on your PC
or a piece of paper than on the detail display or the configurator.
This brings me to another helpful practice: Leave empty steps here and
there if possible, for inserting additional instructions. The first time
you have to reenter three-quarters of the steps because you found a bug,
you'll understand why "white space" (empty steps) is your friend.
Jerry Hidahl
Process Control Engineer
Port Neches Performance Products
Huntsman Corporation
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