Re: [CAD_CAM_EDM_DRO] Re: Re: Re: Re: EMC, ISA and other Questions...

----- Original Message -----
From: Ray Henry <rehenry@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, March 12, 2003 9:05 AM
Subject: [CAD_CAM_EDM_DRO] Re: Re: Re: Re: EMC, ISA and other Questions...


>
> Alex
>
> Paul is much closer to this networking stuff than I am but I want to thank
> you for your work with this. I can immediately see a lot of it's value
for
> motion control. Folk are worried about not having ISA slots or (free)DOS
> compatable PC's but I recently saw a pile of a few hundred 133-266 used
> machines on the floor of a nearby PC store -- 30 bucks in singles.
>
> Paul is right on for right now about the single computer to do both the
> position reading and motion planning on the same processor. NIST's
thinking
> here is reflected on the coffee mug I grabbed this morning. It is a NIST
> Intelligent Systems Division cup and it says, "Real-Time Control System -
> sense - model - act. The EMC currently reads position (sense) at the
start
> of every motion loop. It compares this with where the trajectory planner
> thinks it ought to be (model). Then it develops the motion output signals
> (act) for that loop.
>
> I said "right now" Paul's advice is correct but there is a lot of work
going
> on in the realm of real-time networking and real-time distributed
processing
> out there. Some of these projects have demonstrated very practical
results.
> You mention some of your own work and what you say sounds promising.
Couple
> that with EMC's ease of networking because of the NML language and you
have
> "tight" control of motion processes.
>
> I've done just a bit of work with paper mills around here. The
coordination
> of speeds of dozens of motors on a 1500 foot long machine boggles the
mind.
> More so when you remember that for much of that distance the product is
> flimsier than bargain brand toilet paper, it's 40 feet wide, and it's
running
> at 3000 fpm. If you want to read some interesting stuff about this kind
of
> coordinated motion, look at Nyquist from the Netherlands.
>
> Keep on! There's a lot going on right now with the EMC and several of the
> other systems as well.
>
> Ray
>
>
> > From: "alex" <telecomt@...>
> > Subject: Re: Re: Re: EMC, ISA and other Questions...
> >
> > Paul,
> > thank you for the guidance.
> > This will be the next step.
> > Regards, Alex
>
>
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