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Old October 14th, 2018, 11:32 AM   #1
HoldenC
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Small PLC

Ive done so much research that my head hurts.

Im looking for a PLC that can meet the following criteria :

Runs on 12 or 24 VDC.
Has 2 or 3 Analog Inputs.
Has 2 or 3 Analog Outputs.
Has 2 or 3 Discrete Inputs.
Has 2 or 3 Discrete Outputs.
Has Ethernet connectivity.

Would be nice to be able to connect a small panel for real time view.


I was looking into some Linux based plcs, and possibly a raspberry Pi. However both options I looked at required buying parts from different countries.

Anyone have any other options ?
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Old October 14th, 2018, 12:25 PM   #2
lfe
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I think that Allen Bradley Micro820 meets your requirements and the basic version of the programming software is free.
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Old October 14th, 2018, 12:45 PM   #3
geniusintraining
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Yea, I would also look at a 820 and a Red Lion or PV... then option two a Click and a C-More
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Old October 14th, 2018, 02:18 PM   #4
Ken Roach
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Quote:
I was looking into some Linux based plcs, and possibly a raspberry Pi.
Why ? Do you think that those will give you very low purchase cost, or do you have a reason for not wanting a commercial industrial product, or do you need to connect to Linux-based software onboard the controller ?

Is this a homebrew project, or something you plan to put into a single industrial application, or something you're going to be cranking out dozens of per year ?

Your post history shows some Allen-Bradley PLC-5/SLC-500 and Logix experience. Is there a reason you don't want to use CompactLogix ?
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Old October 14th, 2018, 03:05 PM   #5
DSMR
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The Seimens logo! is a close match
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Old October 14th, 2018, 03:52 PM   #6
damica1
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Allen Bradley Micro820 and a Maple Systems Hmi!

The Micro820 should cost you around $189.00 and a small Maple System Hmi will cost around $290.0
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Old October 14th, 2018, 09:04 PM   #7
HoldenC
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Seems like everyone has the same recommendation. Ill look into the Micro 820.

I was only looking at the Raspberry Pi and Linux stuff to keep the cost down since this would be going into a system Im developing with some partners.

I do like the idea of staying with an AB system, since I'm pretty familiar with them. Also, I would trust their products more than anything else.
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Old October 14th, 2018, 11:58 PM   #8
sparkie
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Quote:
Originally Posted by HoldenC View Post
Seems like everyone has the same recommendation. Ill look into the Micro 820.

I was only looking at the Raspberry Pi and Linux stuff to keep the cost down since this would be going into a system Im developing with some partners.

I do like the idea of staying with an AB system, since I'm pretty familiar with them. Also, I would trust their products more than anything else.
If you are developing this and planning to distribute it commercially, having a commercial PLC platform takes care of SOOOOO much of the product lifecycle stuff for you. If you are truly worried about cost, click is a great way to go. You can call up automation direct and they will help you spec a PLC that suits your needs.
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Old October 15th, 2018, 12:08 AM   #9
James Mcquade
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Regardless of your project, ALWAYS remember who the end user is, MAINTENANCE !!

i'll always say it
if maintenance cannot understand the program and how it works, it's a boat anchor.
the machine breaks, maintenance can't figure out the problem, production is down, management hears about it, you (since you are part of the ones developing the system) get a call at all hours of the night / day to fix the problem.

so what ever you do, make it user friendly to the point maintenance can understand the system and debug the problem.

james
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Old October 15th, 2018, 03:27 AM   #10
cardosocea
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Quote:
Originally Posted by HoldenC View Post
I was only looking at the Raspberry Pi and Linux stuff to keep the cost down since this would be going into a system Im developing with some partners.
You can load Codesys into the raspberry pi, but there's no telling when the SD card will fry. This is a major concern...

The pi would allow you not to need an HMI I guess, but would add the cost on the IO as you would need to buy remote IO instead of embedded IO which the Micro820 already has.
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Old October 15th, 2018, 03:52 AM   #11
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Will your analog need to use PID?
If so then, I would look at the Productivity 1000 series.
https://www.automationdirect.com/productivity/p1000
I would look at the Click PLC if PID is not required.
https://www.automationdirect.com/clickplcs/index

HMI -
C-More Micro
https://www.automationdirect.com/adc...e_Micro_Panels
AdvancedHMI
This is just free software that will operate on your raspberry pi. It will turn it into your HMI.
https://sourceforge.net/projects/advancedhmi/
https://www.advancedhmi.com/forum/index.php?topic=666.0

Regards,
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Old October 15th, 2018, 05:21 AM   #12
chud
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Schneider tm221 plcs. somachine software is free. Even zelio smart rely or siemens logo. Problem with the latter is you are very limited to what you can do over ethernet
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Old October 15th, 2018, 07:35 AM   #13
Elcan
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Quote:
Originally Posted by gclshortt View Post
will your analog need to use pid?
If so then, i would look at the productivity 1000 series.
https://www.automationdirect.com/productivity/p1000
i would look at the click plc if pid is not required.
https://www.automationdirect.com/clickplcs/index

hmi -
c-more micro
https://www.automationdirect.com/adc...e_micro_panels
advancedhmi
this is just free software that will operate on your raspberry pi. It will turn it into your hmi.
https://sourceforge.net/projects/advancedhmi/
https://www.advancedhmi.com/forum/index.php?topic=666.0

regards,
+1
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Old October 15th, 2018, 07:57 AM   #14
Rson
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Quote:
Originally Posted by damica1 View Post
Allen Bradley Micro820 and a Maple Systems Hmi!

The Micro820 should cost you around $189.00 and a small Maple System Hmi will cost around $290.0
I'd second this.

The other option is EZautomation PLC / HMI. If you are a first time customer, they have some really great starter packages that come with software, power supply and HMI/PLC.
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Old October 15th, 2018, 07:57 AM   #15
JesperMP
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Quote:
Runs on 12 or 24 VDC
Must it be able to run on 12VDC ? Must the I/O also be for 12VDC then ? That would limit the number of candidates a bit !
If it is OK if it can run on 24VDC, then that means basically any PLC will be OK.

Apart from that, the way the original quesion is phrased, anyone will basically recommend their favorite PLC.
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