Re: [foxboro] SAMA and Integrated Control Blocks...
- From: "Johnson, Alex P \(IPS\)" <alex.johnson@xxxxxxxxxxxxxxxx>
- To: <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 24 Jan 2007 18:46:09 -0500
Re: SAMA and the I/A Series
There is no automatic correlation between the SAMA notation and the I/A
Series control blocks.
That is, there is no I/A Series tool that can convert SAMA to one or
more control blocks or vice versa. This is a limitation that aggravates
the heck out of folks in the US power market.
Typically, a SAMA drawing is done manually to illustrate the behavior of
the control blocks in a CP, but there is nothing that indicates how the
CP blocks are used to implement the SAMA logic.
So, the statement that the drawing you are looking at represents a CALCA
block may well be true, but there is know way to know that for certain
other than to identify the block and work it out the hard way.
The new configuration tool - InFusion Engineering Environment - goes a
long, long way towards fixing that issue, but I doubt that you have it
in your plant. Currently, it is limited to V8.2 equipment and later.
Re: CALC block language
It is a stack oriented, reverse-polish notation. If you've ever used an
HP calculator you've worked with a similar system.
I don't know if Winston Jenks still has it up or not, but he had some
tools that would take equations and yield CALC block steps (and I think
vice versa). His company is Cape Software www.capesoftware.com. It is a
useful learning tool at the minimum.
Regards,
=20
Alex Johnson
Invensys Systems, Inc.
10900 Equity Drive
Houston, TX 77041
713.329.8472 (voice)
713.329.1700 (fax)
713.329.1600 (switchboard)
alex.johnson@xxxxxxxxxxxxxxxx
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Stephen Ziegler
Sent: Wednesday, January 24, 2007 9:28 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] SAMA and Integrated Control Blocks...
Hello all,
I have been working with Foxboro logic for a few days now. I come from
a
Siemens background (TXP) and the notation is somewhat similar.
However, I do have one question. After looking through the documentation
(in
particular, the integrated control block descriptions), I am still not
sure
how a block would appear on a logic diagram. For instance, I have
several
functional diagrams for valves and instrumentation within a power plant.
I
understand and can follow the logic, but it is all standard SAMA
notation,
however one of my colleagues refers to whole diagram as a CALCA block.
So am
I to assume that this diagram is literally showing the logic within the
CALCA block itself? How can one tell that this is a CALCA block just by
looking at the SAMA?
Reading through the I/A docs, I understand what's going on in these
blocks.
Essentially it looks like assembly language within the block acting on
inputs and outputs.
I greatly appreciate your help!
Regards,
Steve
=20
=20
_______________________________________________________________________
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
=20
foxboro mailing list: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Djoin
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=3Dleave
=20
Confidentiality Notice: =0AThe information contained in this electronic m=
essage and any attachment(s) to this message are intended for the exclusi=
ve use of the recipient(s) and may contain confidential, privileged or pr=
oprietary information. If you are not the intended recipient, please noti=
fy the sender immediately, delete all copies of this message and any atta=
chment(s). Any other use of the E-Mail by you is prohibited.=0A
_______________________________________________________________________
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: //www.freelists.org/list/foxboro
to subscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=join
to unsubscribe: mailto:foxboro-request@xxxxxxxxxxxxx?subject=leave
Other related posts:
