PaulBuz
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| posted on 23/11/07 at 05:49 PM |
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It got to be cheaper/easier to use a logig module surely?
They start at about 60 odd quid.
0 -10v analogue inputs for themocouples,etc. VERY simple software.
http://rswww.com/cgi-bin/bv/rswww/searchBrowseAction.do?Nr=avl%3auk&N=4294963485&name=SiteStandard&forwardingPage=line&R=4798082&c
allingPage=/jsp/browse/browse.jsp&BV_SessionID=@@@@2062422210.1195839773@@@@&BV_EngineID=ccdiaddmigmdigkcefeceeldgondhgg.0&cacheI
ATB
Paul
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Coose
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| posted on 23/11/07 at 09:11 PM |
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quote:
Originally posted by tegwin
Actually I have been designing the circuit for him (Hence why I have an interest in legality)...
based around a programmable IC using optoisolator T-drivers and Triacs to switch the various system components... The program will be written in
BASIC and is relativley straightforwards once you get your head around it...
The biggest issue is keeping the IC isolated from everything else so it behaves itself..lots of snubbers and filters im thinking 
Was just trying to get my head around the input side of things, short of using relays to step the 230V signal down to 5V other options looked a bit
OTT...Hey ho..lol
It does use as many standard N/O N/C temp stats, but a few inputs are having to be designed a bit more ....You could actually do what we want to do
with logic, but it would end up being so complicated...
[Edited on 20/11/07 by tegwin]
[Edited on 20/11/07 by tegwin]
How much does he want to spend making it work properly? I can maybe supply and engineer him a BMS outstation + field devices (i.e. temp sensors etc)
that will get him going as that's what I do for a living!
Tell me what plant, inputs and outputs he has and I'll see what I can do. I may be able to have it installed it too, but I think you'd be
looking at a day rate as I assume that he's in your neck of the woods and I'm not... I wouldn't have the time to do it on a weekend,
so one of our blokes down there would have to come in instead, but I suspect that your friend could probably install it himself.
If you're interested, U2U me.
And NITRAM - Trend isn't necessarily the best - it depends on the application. And, you don't need a PC to operate it, just for
engineering and commissioning. We can supply various LCD panels for user operation. 
Spin 'er off Well...
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tegwin
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| posted on 23/11/07 at 10:53 PM |
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Chears for the offer...
The first microcontroler based protoype has just sucessfully considered an input, processed it, and switched the correct output....
Another couple of days on the design and I should be able to produce a PCB...Then all I have to do is get started on the final software for it to
run...
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