[Embedlets-developer] FW: PLC help

[James C. <ca...@vi...>]

Hi All,

This is an email I have forwarded from a PICLIST Thread.. Interesting one of
the first questions was about .NET which is something I think we should
consider also. Of course we are all in love with Java but J2EE is not that
different from .NET and I am for one considering the requirements for an
MSIL => Class file translator which would allow muvium applications to be
developed in C#,VB.NET and also a debug API which would allow inplace
debugging in C#,VB.NET (Gasp.. sleeping with enemy again!!!)

The point is that we certainly should ensure our embedlet specification is
able to work with .NET at some point along the chain and we should design
for it if possible or is this simply an outrageous thing to say to a bunch
of java die hards!

I also forward this because I think it summarises quite nicely where we are
at, where we are going and what we are doing (or at least I what I think we
are doing)

============

Hi David,

> So we can plug this Java based application into our VB.Net code ?

Embedlets is still in its infancy, but yes, Embedlets are about plugging
networked embedded applications back into VB.Net and J2EE backends in a
seamless and object orientated fashion. Embedlets is at this stage an Open
Source Experts group forging a specification which we hope to build a
standard and reference implementation upon. That standard then creates
opportunities for commericial adopters like ORBIT COMMUNICATIONS , which is
a wireless connectivity company is bang on the 'wide-fan' vision of the
Embedlets target application.

> Then we can extract text from the objects to form a Logic
> statements that we
> can integrate into our C based application in the PIC ?

The embedlets concept is a little more ambitious than this. Using the PLC
analogy which is where this began, PLC logic can be considered as a subset
of the Embedlets specification. In this type of application, the components
of the PLC ie Counters and Relays and Comparitors etc, are all Embedlet's
and the Ladder logic is like the Embedlet connectivity schema and the
Embedlet container is where all these Embedlets execute which is a bit like
the PLC Looping Runtime.

It's alot to take in at once, but basically the idea is to instead of
extract strings and implement some sort of interpreter in C' you serialise
the object tree representing the PLC Embedlet application and upload it over
the internet into the Java Enabled Device implementing the Embedlet
Container which as a minimal platform will be the muvium uVM-877A which is a
PIC16F877A Java Enabled device.


Regards,
James Caska
http://www.muvium.com
'Java Bred for Embedded'





> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PI...@MI...]On Behalf Of Orbit Communications
> Sent: Tuesday, January 28, 2003 6:26 PM
> To: PI...@MI...
> Subject: Re: PLC help
>
>
> James,
>
> So we can plug this Java based application into our VB.Net code ?
>
> Then we can extract text from the objects to form a Logic
> statements that we
> can integrate into our C based application in the PIC ?
>
> Kind Regards
>
> David Huisman (CEO)
> -----------------------------------------------------------------------
> ORBIT COMMUNICATIONS - Wireless Solutions that Work
> (Telemetry, Control, Monitoring, Security, HVAC ...)
>
> Website : http://www.orbitcoms.com
> PO Box 4474 Lakehaven
> NSW 2259, AUSTRALIA
> Phone: 61-2-4393-3627
> Fax  : 61-2-4393-3685
> Mobile: 61-413-715-986
> ----- Original Message -----
> From: "James Caska" <ca...@VI...>
> To: <PI...@MI...>
> Sent: Tuesday, January 28, 2003 11:05 AM
> Subject: Re: PLC help
>
>
> > Again the embedlets specification is ALL about this, ie how to plug
> wide-fan
> > java enabled devices into backend J2EE databases.
> >
> > Example wide-fan scenario we are working on
> >
> > http://crusher.ssu.portsmouth.oh.us/~tkosan/java/embeddedjavascenario/
> >
> > Again I encourage you join the email list just to listen in on the
> emerging
> > spec if you have not already done so ;-)
> >
> > http://sourceforge.net/projects/embedlets/
> >
> > Regards,
> > James Caska
> > www.muvium.com
> > 'Java Bred for Embedded'
> >
> >
> > > -----Original Message-----
> > > From: pic microcontroller discussion list
> > > [mailto:PI...@MI...]On Behalf Of Orbit Communications
> > > Sent: Tuesday, January 28, 2003 7:03 AM
> > > To: PI...@MI...
> > > Subject: Re: PLC help
> > >
> > >
> > > I appreciate your comments but we are not wanting to develop a PLC. We
> are
> > > developing a specific product that will enhance our Wireless
> connectivity
> > > products. It will incorporate many functions not available in a PLC.
> > >
> > > We are interested in the mechanics of how PLC logic is
> presented to the
> > > controller in a typical PLC but have no intention of reinventing
> > > an existing
> > > product.
> > >
> > > Kind Regards
> > >
> > > David Huisman (CEO)
> > >
> -----------------------------------------------------------------------
> > > ORBIT COMMUNICATIONS - Wireless Solutions that Work
> > > (Telemetry, Control, Monitoring, Security, HVAC ...)
> > >
> > > Website : http://www.orbitcoms.com
> > > PO Box 4474 Lakehaven
> > > NSW 2259, AUSTRALIA
> > > Phone: 61-2-4393-3627
> > > Fax  : 61-2-4393-3685
> > > Mobile: 61-413-715-986