a PLC is a Programmable Logic Controller, its like a small computer that you can program via a regular computer and have it take inputs from any source and then output to any source, the ones i have are 24VDC or 120VAC - 208Vac - 250VAC
PLCs are used in all factories and such to control the machinery, the ones i have access to are older units but 160 inputs and 160 outputs should be enough for any sized fish tank. It is also possible to piggyback 8 of these units together and have them operate as one large one but it really slows their decision making down alot, and greatly reduces the amount of programming steps that can be used.
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