Re: Industrial I/O

As a couple of others have pointed out, there are lots of answers to this.
You need to narrow it down a bit.
1) how many input points, output points? How much current to be switched?
2) card in the PC or external intreface (serial, USB, Ethernet...)
3) how much money do you have? Forth Inc will build the whole thing for
you at reasonable prices. (I don't work for Forth Inc.)
4) any legacy systems to talk to?
5) Other details? Lots of EMI? Is the whole thing under water? Is the oil
well on fire at the time?

      Several companies make PC plug in cards that drive solid state relays
like the Opto-22 (the most popular ones) line or Crydom. There are boards
you can stuff with groups of them and you can daisy-chain the boards. They
are generally limited to switching 2 Amperes per channel.
Here is a starting point:
http://www.opto22.com/

It sounds so much more techno-industrial in German:
http://www.opto22.de/

        To many hits to see :
http://www.altavista.com/sites/search/web?q=opto.22+&pg=q&kl=XX&search=Searc
h

      A few of companies make RS485 modules (easily driven from an RS232
port with a little converter) which will drive 110 (220, 440 ... ) switches.
There are DIN-rail mounted ones and ones you can just hold down with duct
tape.

     A new trend is Ethernet (like 10-base-T mostly) nodes. There are a
whole bunch of these also. (Opto 22 has a nice looking line).

You said "Minimalist" so try this:
   1) put a buffer transistor or two on your printer port and run it into a
opto-solid state relay(s) and/or opto-isolators. (Black Box and a couple of
other firms sell switches which will run directly from serial ports or
printer ports)
   2) use Swift-Forth's DLL to convince Windows to let you talk to the
registers and do I/O directly.

I don't recommend X-10 type systems for industrial use. You don't want to
risk things going on or off at the wrong time.

> -----Original Message-----
> From: Jerry Avins [SMTP:jya_at_ieee.org]
> Sent: Saturday, December 08, 2001 7:15 AM
> To: sftalk_at_forth.com
> Subject: [sftalk] Re: Industrial I/O
>
>
> Allen Anway wrote:
> >
> > In my work of factory automation, I have to sense 110VAC inputs and run
> 110VAC outputs.
> >
> > Question (a): Does someone sell a minimalist I/O that could be operated
> with SwiftForth as the brain?
> >
> > Question (b): Does someone sell a minimalist system complete of itself?
> >
> > Thank you for any assistance you can offer --- Allen Anway
> >
> > ----------------------------------------------------------------------
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>
> You don't mention a current requirement. Crydom makes solid-state relays
> that interface TTL-level signals to AC power, and boards to hold
> collections of them. National Instruments makes digital I/O daughter
> boards, and provides them with software drivers. They probably sell them
> connected by a cable to a (Crydom?) external board. You may be able to
> get all the digital I/O you need from a modern printer port. Look at
> http://www.fapo.com
>
> Jerry
>
> www.crydom.com/ www.natinst.com/
> --
> Engineering is the art of making what you want from things you can get.
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Received on Sun Dec 09 2001 - 12:49:55 PST