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plc control ACs Temp

hi, i want a plc that can control three ACsas the following: when two ACs is ON, the third is OFF, and the are being switched: A B C

1 0 1 1 1 0 0 1 1

And there is some conditions: when the temprature reaches the degree X, the three ACs turn ON, and when the temp. reachs degree Y, only one AC turns ON and the others set OFF.

I'm not a prof. in the PLC systems, but i couldn't find such a controler like this over the net, So if u plz can help of where i can find such product.

Thanks in advance

Hisham fikry

Reply to
hishoo11
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The closest I have seen is a controller that minimizes the number of cycles for each machine and distributes the cycles among all. Looked at that way, your problem might be restated as, "if another machine is needed, turn on the one that has been off the longest. If 1 less machine is needed, turn off the one that has been on the longest. You don't need to keep track of the actual time each machine has been on and off, just a pair of ordered lists.

The decision of one more needed, or one less needed can either be based on 4 separate setpoints, (temperatures at which-- none needed, 1 needed, two needed, 3 needed) or an integrating controller that subtracts setpoint from measured temperature and integrates that error, and whose output passes through those same 4 decision levels.

Reply to
John Popelish

A= (TEMP >= X ) OR ( TEMP > Y ) B= (TEMP >= X ) OR ( TEMP > Y ) C= (TEMP >= X ) OR ( TEMP

Reply to
Fred Bloggs

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