Low cost PLC with TCP/IP and GPS
Low cost PLC with TCP/IP and GPS
(OP)
I am looking for a PLC/system with the following minimum requirements:
1. Low cost! ($750 USD)
2. 6x 4-20 mA input (if three can be thermocouple input would be good)
3. Wireless connectivity via TCP/IP, GPS and 3G (ability to choose which one)
4. Ability to log approx 1800 data points
5. Compatible with 240V 50Hz power
6. Casing not required (can be exposed I can organise that)
Can you please recommend a product which complies with the above.
Thank you in advance.
1. Low cost! ($750 USD)
2. 6x 4-20 mA input (if three can be thermocouple input would be good)
3. Wireless connectivity via TCP/IP, GPS and 3G (ability to choose which one)
4. Ability to log approx 1800 data points
5. Compatible with 240V 50Hz power
6. Casing not required (can be exposed I can organise that)
Can you please recommend a product which complies with the above.
Thank you in advance.





RE: Low cost PLC with TCP/IP and GPS
And lastly, what volumes are you thinking about?
The S7, supported with Westermo modules, can - of course - do it all. Not sure about the costs, thogh.
Gunnar Englund
www.gke.org
--------------------------------------
100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: Low cost PLC with TCP/IP and GPS
I'm not sure on your request for 50Hz 240VAC. I was under impression that PLCs generally take 24VDC, 12VDC, etc. I mean, what are you trying to do, and why can't you rectify your AC source to DC, or even, use a battery?
Can you give more information on your application?
RE: Low cost PLC with TCP/IP and GPS
Device type: I guess it can be called a RTU technically speaking?
Input signals: I have not selected the instruments yet, however 4-20mA seam to be the most common type. However I am flexible.
Output signals: None required.
Power supply requirements: I just though I put that in so to make sure it is covered. The mains supply here is 240VAC 50Hz.
GSM, 3G Wireless connectivity: As long as it has the ability to connect to a modem allowing wireless connection I am happy.
I hope this helps.
Thank you.
RE: Low cost PLC with TCP/IP and GPS
Keith Cress
kcress - http://www.flaminsystems.com
RE: Low cost PLC with TCP/IP and GPS
RE: Low cost PLC with TCP/IP and GPS
Additionally I am not aware of any PLC that natively supports GSM or 3G data services.
That being said your best bet may be a combination of an Automation Direct (automationdirect.com) PLC with a cellular modem. I've used the Raven X, but there are cheaper versions out there. An automation direct with the I/O you specified should run you in the general area of 1000 dollars. A cellular modem in the range of 200-500.
(On a side note you could use an additional router at your PLC and use a wireless bridge to get where you need to go. I just did this at my house)
RE: Low cost PLC with TCP/IP and GPS
RE: Low cost PLC with TCP/IP and GPS
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RE: Low cost PLC with TCP/IP and GPS
Something like to this
http://www.moxa.com/product/ioLogik_E2262.htm
with additional
http://www.moxa.com/product/OnCell_G3100.htm
Best Regards
Slava.
RE: Low cost PLC with TCP/IP and GPS
RE: Low cost PLC with TCP/IP and GPS
The PLC has some nice functions such as calculate number of bytes for message sending etc.
If you are in Ozz a processor with Ethernet built in would probably cost you $2500, analogue card $1000, serial card $800 etc.
I always use 4-20ma by the way - never voltage inputs. 4-20ma is far less prone to induction and there are no voltage drop problems.
RE: Low cost PLC with TCP/IP and GPS
RE: Low cost PLC with TCP/IP and GPS
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RE: Low cost PLC with TCP/IP and GPS
So far that's £500 gbp. They also do converters to change 4-20mA and /or thermocouple to 0-10v so your sensors can be used unfortunately i haven't got prices on these as i haven't used them.
Units are powered from 12v,24v ac/dc 110vac or 230/240vac so no PSU required.
The units are very easy to program and offer fbd, ladder and sfc programing methods.
Crouzet also offer a custom build service but i don't know if they have a minimum order level for this.
Hope this helps