Groups > sci.electronics.design > #454953

Re: Output boards, SPI vs I2C

From	rickman <gnuarm@gmail.com>
Newsgroups	sci.electronics.design
Subject	Re: Output boards, SPI vs I2C
Date	2017-04-03 15:18 -0400
Organization	A noiseless patient Spider
Message-ID	<obu71i$6eb$1@dont-email.me> (permalink)
References	(9 earlier) <rk6jdcduuolspodf8ivi36sn0m4bn60etn@4ax.com> <08WdnZ9VyIcj60fFnZ2dnUU7-fPNnZ2d@supernews.com> <obebr7$uu3$1@gonzo.alcatraz> <7oeldc5ibmm7svcqecs2knh0thoif9bs2c@4ax.com> <obu1ue$rcc$1@reader1.panix.com>

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On 4/3/2017 1:49 PM, David Lesher wrote:
> I've been looking at other PLC controller offerings, and thus
> far the <http://www.digital-loggers.com/plchw.html> comes out
> ahead; it does a lot of what we need in a package with a good
> price. Alternatives I've found either cost far more or require
> lots of integration. (I've just been pointed at the Siemens Logo
> line and am looking into it now.)
>
> The Digital Logger has other things we don't need but we can
> ignore them.  It does not have one important item, wired
> Ethernet.
>
> I'm pondering how that could be added outboard. What we need is
> really a terminal server: serial from the PLC on the one side,
> and TCP/IP on the other. You can buy such in a shiny box for
> say $100  <http://www.antaira.com/products/STE-501C?gclid=CIDYyKbRiNMCFdyEswod5E8AnQ>
> or less for boxless <http://www.mouser.com/ds/2/224/XPort_DS-220314.pdf>
> The latter requires making a PCB, worrying about power, etc.
> Any alternatives you're aware of?

Why don't you just get a controller that includes Ethernet to start with?

I haven't seen where you explain why you are only looking at PLC 
controllers rather than generic CPU boards.  From how you have explained 
your needs so far, there is nothing in a PLC that you will use that is 
different from a CPU board.  From what I can see, you would do well with 
a Raspberry Pi or a Beagle Bone Black type board.  Ethernet included and 
tons of support (metric tons even).

So what do you get with a PLC that you don't get with one of the *many* 
CPU boards?

-- 

Rick C

Thread

Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-25 02:46 +0000
  Re: Output boards, SPI vs I2C krw@notreal.com - 2017-03-24 23:25 -0400
    Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 04:13 +0000
  Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-25 14:04 -0400
    Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 04:11 +0000
      Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-26 02:37 -0400
        Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 14:41 +0000
          Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-26 12:47 -0400
            Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-26 19:49 +0000
              Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-27 10:49 -0400
                Re: Output boards, SPI vs I2C Jasen Betts <jasen@xnet.co.nz> - 2017-03-27 18:41 +0000
                Re: Output boards, SPI vs I2C Martin Riddle <martin_ridd@verizon.net> - 2017-03-27 19:07 -0400
                Re: Output boards, SPI vs I2C Jasen Betts <jasen@xnet.co.nz> - 2017-03-28 08:03 +0000
                Re: Output boards, SPI vs I2C Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-03-28 10:44 -0400
                Re: Output boards, SPI vs I2C Jasen Betts <jasen@xnet.co.nz> - 2017-03-28 18:59 +0000
                Re: Output boards, SPI vs I2C Martin Riddle <martin_rid@verizon.net> - 2017-03-28 15:37 -0400
                Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-04-03 17:49 +0000
                Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-04-03 15:18 -0400
                Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-04-04 02:59 +0000
                Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-04-04 00:54 -0400
                Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-28 05:08 +0000
                Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-28 02:16 -0400
  Re: Output boards, SPI vs I2C Martin Riddle <martin_ridd@verizon.net> - 2017-03-27 19:03 -0400
    Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-28 03:28 +0000
      Re: Output boards, SPI vs I2C rickman <gnuarm@gmail.com> - 2017-03-28 00:38 -0400
        Re: Output boards, SPI vs I2C David Lesher <wb8foz@panix.com> - 2017-03-28 14:47 +0000

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