Between electrical control circuits and PLC control principle is interlinked, natural electric control can through PLC is more convenient, efficient, so how is the concrete electric control circuit?
What is converted into a ladder diagram, and then into the PLC controlled logic instruction, in order to more clear intuitive that changes all the way, we in the most simple: button interlock and reversing control circuit as an example.
, 1, the electric control button interlock control circuit of positive &negative introduce reason 2, the main circuit of interlock and reversing control buttons 3, interlock and reversing control buttons control circuit 4, buttons, interlock and reversing the role of a control circuit components 5, buttons, interlock and reversing control circuit working principle of 6, buttons, interlock control circuit of positive &negative various protection 7, buttons, the advantages and disadvantages of interlock and reversing control circuit 8, buttons, interlock and reversing control circuit physical wiring diagram two, PLC
transformation section 2, PLC hardware connection, external connection 3, PLC controller
ladder diagram 4, by the logic of ladder diagram into instruction electrical control circuit is the basis of the function of PLC, familiar with the circuit diagram is the basis of the introduction to the PLC.
Circuit diagram corresponding transformation logic instructions, step by step, at the time of learning can analysis it easy after the first difficult, similar analysis method.
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