Re: [foxboro] Interger bit order inversion

I'd do the following:

1) Build an MCIN block to decode
   a) Set IOMOPT to 0
   b) Connect the integer to the II01 parameter
   c) Set the block in automatic
   The decoded bits are in CIN_1 through CIN_16.

2) Build an MCOUT block to rearrange the bits
   a) Set the IOMOPT to 0
   b) Connect the CIN_x parameters from the MCIN to the IN_x
      parameters of the MCOUT block
   c) Set the block in automatic
   The rearranged bits are in the PAKCRB parameter of the MCOUT block

No CALC programming required.

Remember my rules for implementation:

There are a few rules that one should follow when designing a control
system:

*       Do it in regulatory control blocks. 
         most efficient; least prone to problems)
*       If the regulatory control blocks can't do it, use a CALC block.
         efficient, but must deal with BAD and coding errors; 
         debugging is a pain
*       If the CALC block can't do it, use a Sequence Block
         Pretty inefficient, but in the CP so its FT. 
         Code/compilation relatively complex. 
         Debugging is a pain.
*       If you can't do it in a sequence block, 
         reconsider if you need to do it.
*       If you must do it, see if you can do it in a shell 
         (sh, ksh, csh, perl, etc.) script 
         Easier to debug, easy to schedule, remember to use omgetimp
         and omsetimp to avoid broadcasts, remember to use show_params
         to check the IMPORT table
*       If you can't do it in a script, reconsider doing it.
*       If you must do it, see if there is a 3rd party or Foxboro
package
         that will do it. (Ask on the mailing list.)
*       If you must do it and can't find a package, write a program.



Regards,
 
Alex Johnson
Invensys Process Systems
10900 Equity Drive
Houston, TX 77041
713 329 8472 (desk)
713 329 1600 (operator)
713 329 1944 (SSC Fax)
713 329 1700 (Central Fax)
alex.johnson@xxxxxxxxxxxxxxxx

-----Original Message-----
From: foxboro-bounce@xxxxxxxxxxxxx [mailto:foxboro-bounce@xxxxxxxxxxxxx]
On Behalf Of Airhart, Chad M.
Sent: Friday, November 14, 2008 4:59 PM
To: foxboro@xxxxxxxxxxxxx
Subject: [foxboro] Interger bit order inversion

Anyone have a calc block program for inverting the order of the bits in
a 16 bit integer?   Example 0000010011000001 to 1000001100100000.

Chad M. Airhart
Principal Engineer
Instrument, Electrical and Control Systems
LyondellBasell Industries

Equistar Chemicals
P.O. Box 513
Old Bloomington Hwy
Victoria, TX 77901
Tel. +1 361.572.2568
Fax. +1 361.572.2541
Mobile: +1 361.935.3230

chad.airhart@xxxxxxxxxxxxxxxxxx
www.lyondellbasell.com <http://www.lyondellbasell.com/>  




 
 
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