[foxboro] AW: HLBL "to the power" expression
- From: "Sieling, Marcel" <Marcel.Sieling@xxxxxxxxxxxx>
- To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
- Date: Wed, 28 Apr 2010 00:08:18 -0400
Hi list,
David wrote:
>Here's a subroutine that handles positive, integer exponents.
Please keep in mind, that each line of sequence code loads the CP and that this
routine can load the CP a lot if BPCSTM and exponent are large. In any case
(also for small exponents) it would be more efficient to use a MATH block for
the calculation and link that to the sequence, this is what I'd recommend.
Best regards / Mit freundlichen Grüßen
Marcel Sieling
Senior Application Consultant
Invensys Systems GmbH
Emanuel-Leutze-Str. 11
D-40547 Düsseldorf
Germany
T +49 211 5966302
M +49 163 5966302
F +49 163 99 5966302
E marcel.sieling@xxxxxxxxxxxx <- new!
iom.invensys.com
P Please consider the environment before printing this e-mail q
________________________________________
Von: foxboro-bounce@xxxxxxxxxxxxx [foxboro-bounce@xxxxxxxxxxxxx] im Auftrag von
Johnson, David [David.Johnson@xxxxxxxxxxxxxxxxxx]
Gesendet: Mittwoch, 28. April 2010 00:37
An: foxboro@xxxxxxxxxxxxx
Betreff: Re: [foxboro] HLBL "to the power" expression
Peter,
Here's a subroutine that handles positive, integer exponents.
This compiled and worked as an IND seq block, so you can test it out.
Regards,
David
INDEPENDENT_SEQUENCE{*******************************
** **
** INDEPENDENT SEQUENCE **
** CONTROL BLOCK **
** **
*****************************************}
CONSTANTS
VARIABLES
USER_LABELS
SUBROUTINE POW ( IN NUMBER : R
IN EXPONENT : R
INOUT ANSWER : R)
STATEMENTS
ANSWER := 1;
WHILE (EXPONENT > 0) DO
ANSWER := ANSWER * NUMBER;
EXPONENT := EXPONENT - 1;
ENDWHILE;
ENDSUBROUTINE
STATEMENTS{*****************************************
* Specify the statements here *
*****************************************}
CALL POW (RI0001, RI0002, RO0001);
ENDSEQUENCE
-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx] On
Behalf Of Bruley, Peter T
Sent: Tuesday, April 27, 2010 4:31 PM
To: 'Foxboro DCS Mail List' ('Foxboro DCS Mail List')
Cc: Radtke, Richard W
Subject: [foxboro] HLBL "to the power" expression
Hi List
Does anyone know how to do a power function x^y in HLBL?
Similar to the pow(x,y) call under C
or CALCA block EXP x y
Thank you,
Peter Bruley
Xcel Energy | Responsible By Nature
Plant Process Computer Analyst
Sherburne County Generating Plant
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