Re: [foxboro] HLBL "to the power" expression

  • From: "Johnson, David" <David.Johnson@xxxxxxxxxxxxxxxxxx>
  • To: "foxboro@xxxxxxxxxxxxx" <foxboro@xxxxxxxxxxxxx>
  • Date: Tue, 27 Apr 2010 17:37:13 -0500

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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