Experimental Physics and
Industrial Control System

"Pete R. Jemian" <[email protected]> · Tue, 27 Sep 2011 11:49:20 -0500

Paul:

That's not the device you want. It has 8 DC inputs (DC inputs read from

switches and the like - consider these as boolean signals only). You

want a DC voltage input channel ("AD" in AutomationDirect's terms). The

ethernet support card is correct.

The following card would provide the correct input you need:

F0-04AD-2
	4-channel analog input module
	12-bit resolution
	range: 0-5V or 0-10V

BUT, it takes the one expansion slot available in the D0-05DR PLC.

which means you can't use the H0-ECOM100 module also. Can you do Modbus

over the one of the two serial ports on the D0-05DR?

If not, move to the DL06-series and pick your expansion modules again.

Pete

On 9/27/2011 11:03 AM, Paul Nord 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

--
----------------------------------------------------------
 Pete R. Jemian, Ph.D.                <[email protected]>
 Beam line Controls and Data Acquisition, Group Leader
 Advanced Photon Source,   Argonne National Laboratory
 Argonne, IL  60439                   630 - 252 - 3189
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    Education is the one thing for which people
       are willing to pay yet not receive.
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System