Tony,
Thanks for the idea, I had thought of setting up a PIC to do the job
The price os PLC's over here is a little high, the budget i have to
work with is non existant and the PC will be more adaptable in the
future as when the press is not in opperation it will be used for other
things.
Thanks for your thoughts, I can see where using a PLC may have
been a more industrial option.
Regards
Andrew
----- Original Message -----
From: Tony Mouawad <[EMAIL PROTECTED]>
To: Andrew Hooper <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, August 25, 2000 3:48 AM
Subject: Re: [rtl] Press Controll
> Hi Andrew, just ouf of curiosity... why not use a PLC? Is it because of
the
> encoder interface?
>
> I've built several applications similar to yours and most were doable with
a
> PLC system. When needed, I patched in a PC based user interface via
serial
> comm to the PLC for monitoring or data handling. I only persue PC based
> real time systems when the application requires something that outperforms
a
> PLC or when something that is extremely complicated to code. I guess price
> can be an issue... you get more bang for the buck out of a PC than a PLC.
> Until you take into consideration the harsh environment your system will
> work in... lots of factors to consider sometimes.
>
> Also, you dont have to worry about hard drive failure with a PLC. ; -)
>
> Just a thought...
>
> - Tony
>
>
> ----- Original Message -----
> From: Andrew Hooper <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Wednesday, August 23, 2000 6:12 PM
> Subject: [rtl] Press Controll
>
>
> > Hi,
> >
> > We have a press that we would like to controll using rti, or something
> > similar
> > i currently have the bones of a system setup using RTAI and mbuff, but
> since
> > its been close to a years since i set this up im wondering if there have
> > been
> > any advancments as to an interface and inviroment that would allow me to
> > set this up a little easier.
> >
> > What we have is the following.
> >
> > 40ton press with mechanical feeder, with an slodstate relay on the
> > controller,
> > hold the relay closed and the press will cycle, release and it will
stop.
> >
> > Encoder that sits on the metal being feed and checks that the correct
> amount
> > is being feed.
> >
> > Magnetic Switch at TDC.
> >
> > What we are trying to acheive.
> >
> > Enter the Lenght/encoder count, Enter the QTY of peices wanted press
enter
> > and the press will cycle until done.
> >
> > Each cycle the encoder is checked to see that the matereal has been feed
> > and the magnetic sensor is checkd to ensure that the press has reached
TDC
> > before triggering another cycle.
> >
> > When each cycle is triggered incrament the counter by one.
> >
> > Simple Eh. :)
> >
> > Well i wrote the routine about one year ago, took the system and the
info
> to
> > the
> > be installed and it has sat there for that year waiting for the
> electritian
> > to install
> > the interface, now its installed they have lost the paperwork on how it
> was
> > done
> > and somehow the HDD on the system has died (Guess What) No Backup :(
> > I could and should kick myself for that one....
> >
> > Anyway, looks like im back at square one again.
> >
> > Any one have any ideas..?
> >
> > Regards
> > Andrew
> >
> >
> >
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