• PLC Programming Tutorial for Beginners_ Part 1
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    PLC Programming Tutorial for Beginners_ Part 1

    Hello again, in this lesson we will learn how to write a PLC program for the machine illustrated here by using an “S7 300” PLC and “STEP 7” software. As you can see we have two pumps which are being used to transfer two separate liquids into this tank. Inside the tank there are two level switches installed in the lower and upper parts of the tank respectively, the switches are digital which means that they can only ever be in one of two states: “true” or “false.” There is also an electrically powered mixer inside the tank which starts working for a defined period of time, mixing the two…