Found this link while looking into a project.
http://web1.automationdirect.com/static/manuals/d006userm/ch7.pdf

Has state machines and ladder logic all there (At a simple level anyway)

>>> smplx@allotrope.net 07 Feb 08 16:55 >>>


On Thu, 7 Feb 2008, Eduardo Garcia wrote:

> Hello Sergio,
> 
> Yes, it really seems what can solve my problem. I will research more about 
> state machines.
> 
> Could you point me any reference, book, link or anything else?
> 
> Thanks,
> Eduardo Garcia
> 

Hi Eduardo,

There are some tools around that will let you draw state diagrams and 
generate code from them. Most of these are not optimised for small MCUs. 
They generate C or C++ code which you then need to compile into an 
executable. There is a version of ZMech that will generate optimised PIC 
(14 bit core) assembler. It supports direct interactive debugging of the 
generated state machine executable (you can toggle a virtual input and 
watch the path the state machine takes on the diagram, see a change in a 
virtual output and trace the code execution via the built-in simulator - 
all at the same time).

You can see a bit more about ZMech here:

http://www.xcprod.com/titan/ZMECH_PIC 

and a bit more interesting PIC related stuff here:

http://www.xcprod.com/titan/ZMECH-DOC/generate/state-machine/block-indx.html 

Regards
Sergio Masci

http://www.xcprod.com/titan/XCSB 
Optimising Structured PIC BASIC compiler
FREE for personal non-commercial use
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