Inexpensive Solution

atatari · Jan 24, 2008

Dear Friends,
I am looking for a controller that has 3-6 DI, 3-4 DO and also couple AI and AO. The only issue is I need to be able to draw up to 500ma from the AO channels. I probably can do this with a simple transformer and resistors ; however I like to have some control over the functions. price is an issue as my Boss is cheap!!
It does not to be a fancy solution( Like AB, AutomationDirect or...) , an electronic board capable of doing the job also works.
Thanks

halosome · Jan 24, 2008

You can try Moeller's easy control relay.

In fact numbers of AI/AO is more important to be clear than that of DI/DO. And the voltage is needed too.

mrtweaver · Jan 24, 2008

you could also try the horner xle or xlt. one is a touch screen but both have a fairly cheap price and each has a unit meeting your goals. check it out heapg.com

halosome said:
You can try Moeller's easy control relay.

In fact numbers of AI/AO is more important to be clear than that of DI/DO. And the voltage is needed too.

atatari · Jan 25, 2008

The Problem is that I need 500ma output on AO channels. Does anybody know any device that can provide that range of output?

timbo_uk · Jan 25, 2008

What are you using the analogue outputs for, why do they need 500mA?

atatari · Jan 25, 2008

Its for a device that I am using and I need to vary the current between 0-500ma!!!.
If I can't find anything I have to go with traditional way of using a xfmr and resistor and a Pot

wdd0422 · Jan 25, 2008

Automation Direct - 05 series. $250 to $300 american for 8 DI and 6 DO with a 2 channel AI and 2 channel AO card. Not sure on amp rating though.

atatari · Jan 25, 2008

thats the problem the maximum output is 4-20ma.

wdd0422 · Jan 25, 2008

You can grt this stuff on Ebay for almost nothing.

halosome · Jan 25, 2008

Sounds you need a intelligent battery charger. If you don't mind the cost, I know a guy definetly can help. He works on microcontroller based charger control up to 15A.

Stephen Luft · Jan 25, 2008

I am looking for a controller that has 3-6 DI, 3-4 DO and also couple AI and AO.

an electronic board capable of doing the job also works.

Our Smart-PAK PLUS will meet those requirements - www.entertron.com/smart-pak.htm

Hope this helps.

God Bless,

atatari · Jan 25, 2008

Wdd0422 what to look in ebay?

milldrone · Jan 25, 2008

atatari said:
The Problem is that I need 500ma output on AO channels. Does anybody know any device that can provide that range of output?

How about this. http://www.pwmcontrols.com/

Or this. http://www.aec-remote.com/PV2.html

atatari · Jan 28, 2008

Thanks for all replies.

Well, it turns out that even these two manufacturers have PWM output which is a positive tiangular output. Not good for my application.
Gave up!!!

milldrone · Jan 28, 2008

atatari said:
Thanks for all replies.

Well, it turns out that even these two manufacturers have PWM output

I must have missed the post where you specified no PWM.

There is a solution but it won't be inexpensive. You can use multiple signal conditioners. If your using 4 to 20 ma input you would have to put all of your conditioner's inputs in series and all of the outputs in parrallel. If you are using 0 to 10v the conditioners would all be parrallel (inputs and outputs). If memory serves me correcly I bought a signal conditioner from delta comuter systems (Peter Natchwey's company) that could make 0 to 200 ma output from a 0 to 10 volt signal. I think the part number was VC2100.

Inexpensive Solution

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