Re: PLC
On 19 Oct 2001, at 15:16, C. K. Lester wrote:
>
> What the heck are you guys 'n' gals talkin' about?!
PLC = Programmable Logic Controller ( or Device) - generally a 8bit cpu with
an eeprom and some ram (sometimes inside the cpu, like the
8035..8049etc), with minimal interface on a small (2x3inch) printed circuit
board. You supply raw power (generally 6..12vdc), some programming via a
serial or parallel port off the desktop or laptop computer, and it does things.
They are used for embedded devices in equipment, from smart thermostats,
programmable conveyor systems, environment controllers, sun trackers,
data logging, small systems monitoring, ATM machine operation, light
sequencers, Star Trek communicators and scanners, etc.. Cost anywhere
from $25 to $250, capable of various jobs. I like the looks of the
http://www.parallaxinc.com Stamps most of all, and they are smallest, use
the least power, cost the least, program in basic, and can do as much as
any other plc,,, problem is, there is no email support and the installer is very
misbehaved so i won't run their software untill i know someone else who has.
With the port monitor ? wrote in Eu, it should be easy to reverse engineer the
programming software, and make the stamp programmable in Eu.
Kat
> ----- Original Message -----
> From: "Kat" <gertie at PELL.NET>
> To: "EUforum" <EUforum at topica.com>
> Sent: Friday, October 19, 2001 2:21 PM
> Subject: Re: PLC
>
>
> > On 19 Oct 2001, at 14:23, euman at bellsouth.net wrote:
> >
> > >
> > > Best bet Kat is to go thru an electrical supply house in your area that
> > > specifically sell Allen-Bradley and Cutler-Hammer products. The reason
> for this
> > > is they tend to be cheaper than going straight to AB or CH cause they
> tend to
> > > order quantity and can achieve a better price from them.
> >
> > This is Alabama, there is no way i will goto an electrical suppy house in
> my
> > area! If i can't get it online, i drive to another county to get it, or
> farther, out to
> > 60 miles, and i can't get a yellow pages out of this area, the phone
> company
> > wants $100+ for the special order phone books. Really, seriously, i truck
> in
> > tons of building materials every month from an hr away, even with 3 local
> > building supply places. I don't buy *anything* locally if i can possibly
> avoid it.
> > Many reasons why. So i was hoping you'd be more helpful with online items.
> >
> > On 19 Oct 2001, at 13:21, Evan Marshall wrote:
> >
> > >
> > > You might also try PLC Direct at http://www.automationdirect.com.
> > > Their prices are listed on the site.
> >
> > The smallest one they have at
> > http://www.automationdirect.com/store/plc/dl05.html is $99, plus $99 for
> the
> > software, plus misc items like shipping, cables, plugs, and necessary
> > options... are you sure this is worth more than the $45 Stamps? I don't
> need
> > these things to be prepackaged in an enclosure, after all, and speed isn't
> so
> > important now, but power draw is.
> >
> > Kat
> >
> >
>
>
|
Not Categorized, Please Help
|
|
