Four contactors k1, k2, k3 & k4. If temperature goes over set temp by, 1 degree bring one contactor in, two degrees bring two contactors in, three degrees bring three contactors in & four degrees bring four contactors in. But my problem is: how do I write the plc program so that it's not always the same contactor that comes in first. (different sequence everytime it goes overtemp)?
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