Experimental Physics and
Industrial Control System

David Dudley <[email protected]> · Tue, 27 Sep 2011 12:57:43 -0400

Another option is something like a ADAM 6017 from Advantech.

They're analog inputs with modbus interface directly on Ethernet.

Somewhere around $250 if memory serves....

Relatively easy to implement.

David

On 9/27/11 12:03 PM, "Paul Nord" <[email protected]> wrote:

> Mark,
> 
> So the entry-level system might look like this:
> D0-05DR  8 DC IN / 6 RELAY OUT MICRO PLC W/AC P/S              $119.00
> H0-ECOM100 10/100MBIT ETHERNET COMMUNICATION MODULE DL05/06 OPTION MODULE WITH
> MODBUS TCP $199.00
> 
> Anything else I'd need?
> 
> (footnote: 8 inputs will be more than enough.  I selected the relay outputs
> thinking I could easily picture wanting to turn on a light or operate a
> solenoid valve.  But that's not a requirement at the moment.)
> 
> Paul
> 
> 
> On Sep 27, 2011, at 10:27 AM, Mark Rivers wrote:
> 
>> The EPICS Modbus driver works fine with the Koyo PLCs, and I have tested
>> reading ADCs with it.
>> 
>> Mark
>> 
>> 
>> ________________________________
>> 
>> From: [email protected] on behalf of Paul Nord
>> Sent: Tue 9/27/2011 10:22 AM
>> To: [email protected]
>> Subject: Re: Simple ADC - Ethernet device?
>> 
>> 
>> 
>> Josh,
>> 
>> The price on the Koyo devices is appealing.
>> 
>> But the EPICS driver seems to be for serial communication, not ethernet.
>> 
>> Paul
>> 
>> 
>> On Sep 27, 2011, at 9:50 AM, Josh Stein wrote:
>> 
>>> Although not purpose-built, we often use PLCs for simple analog acquisition.
>>> At APS the PLC-Direct brand (basically Koyo) is very ubiquitous.
>>> 
>>> 
>>> 
>>> On 9/27/11 9:38 AM, Paul Nord wrote:
>>>> I need to monitor the pressure in a gas supply bottle.  We expect to need
>>>> to change gas bottles every few days and we'd like to alert the detector
>>>> operators in plenty of time.
>>>> 
>>>> Getting a transducer to produce a voltage is simple enough.  I'm a little
>>>> unclear about the next step: digitizing that voltage and getting that
>>>> information to our EPICS softIOC.  I'd like a simple box that connects to
>>>> the voltage and also to an ethernet port.
>>>> 
>>>> There is an Epics driver for the environment monitor Websensor from
>>>> Esensors Inc.  It monitors temperature, humidity, and illumination.  The
>>>> device can also monitor a voltage reading.  I presume it would be easy
>>>> modify the driver to also get the voltage reading.
>>>> 
>>>> 
>>>> Is there another ethernet-based ADC that you would recommend?
>>>> 
>>>> There are some nice USB devices.  But I don't really want to setup a
>>>> computer just to monitor one voltage remotely.
>>>> 
>>>> I found some nice modular systems from Omega and NI.  Alas, there are no
>>>> Epics drivers.
>>>> 
>>>> Paul
>> 
>> 
>> 
>> 
> 
> 

David

-- 
"... The Crossbow Project. There's No Defense Like a Good Offense. " - Real
Genius (1985)

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System