Basically, the ISA guys have defined a standard for Engineering Logic
Diagrams that is world widely used.
PLC programmers and Automation engineers are familiar with this diagrams the
most used tool for draw this is AUTOCAD.
There is not open source tool that support this drawings, I think dia could
do the job.
This a link to the standard. And I have may examples to send, I don't know
is possible to post pdfs files on the list.

http://www.isa.org/Template.cfm?Section=Standards8&Template=/Ecommerce/ProductDisplay.cfm&ProductID=2505

On Wed, Mar 25, 2009 at 11:59 AM, Leo Kogan <[email protected]> wrote:

> Hello,
> I would like to help develop DIA for supporting ISA Logical Diagrams.
> I'm not sure about the copy right of ISA's symbols.
> I'm not sure were I should start.
>
> So any help would be appreciated.
>
> Best Regards
>
> Nardo
>



-- 
Saludos,

Leo Kogan
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