This design pass exactitude analysis control request, draw a procedure control flow chart, write an I/O allocation table, and carry on PLC electricity control of the hardware choose type and software to choose a type and draw one according to the I/O allocation table and PLC model number hard connect line diagram, trapezoid diagram and the procedure language preface instruction form, carry on procedure to adjust to try circulate according to trapezoid diagram and the procedure language preface instruction form, analysis the procedure adjust to try result, success completion PLC electricity control system of design.
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