Howto: PLC Reef Controller II

Here a diagram if you still need one.
Just FYI you can put multiple 250 ohm resistors in series and get 1-5 off of each of those if you need multiple outputs from a single loop.

wy_reefer
 
Don,
checked out your web site looks good.
I have plans very simalar to that.

I wonder if you could slurry the salt so you could mix it with a pump to your RO water?

I read somewhere that if you go to high in salinity it will mess things up is this true?
 
I use a Honeywell UDC3000 PID for temp control with a K thermocouple and a Idec Smart Relay PLC. Idec has the a great GUI for logic and will pretty much do anything you need to do with a tank
 
Did you get the UDC3000 free? Can I have one? LOL
Pricey option for home reef temperature control, nice!
 
I'm going to drag this thread up from the dead. Any new updates? I'm starting to work with a PLC and am just getting into the temperature/pH/ORP control hard of the hardware and I'm already lost.

Eric
 
here in about 2 weeks Ill be building the panel for my reef controller of stuff Ive collected over the past several months.

What I have collected so far...

allen bradley pico gfx with lcd.. 8 dc inputs 2 of which can be analog with 4 relay outputs(free)

about 6 pieces of 6" wire duct panduit samples

allen bradley 24vdc power supply(free)

24vdc contactors(free)]

omega.com thermocouple with a 4-20ma output(free)...found it laying on the ground at the local toyota plant one day still in the box(works fine) fell out of a contractors golf cart prolly

picosoft pro software

hoffman 24x12 nema 12 enclosure - 20 bucks with back plate

4 illuminated led push buttons

4 led pilot lights

still looking for the ph sensor(need to search omega.com some more)

bunch of terminal blocks


to hook the pumps/llights up to this I plan on mounting handy boxes with receptacles in them to the bottom of the enclosure. The receptacles will be controlled by the contactors which are switched by the relay outs.

All of my lighting should be in here this week, meaning I will have all my aquarium done within 2 weeks. After that I will begin on the controls.

I just have a 55 gallon with a 20 gallon rubbermaid container collecting the overflow which feeds my skimmer. Skimmer feeds a 10 gallon refug which has a return pump in it. So controllin the levels can get irritating sometimes


Im not a fan of Solid State stuff because of heat issues and cost. For this application I think SSR stuff is pointless. I dont need the switching speeds and dont give a crap if I hear a miniature contactor pull in and out sometimes... :)
 
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