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)
Don't think it exists? Google the Air Force X-37B project.
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