![]() This is accomplished using familiar ladder diagrams in a manner that is transparent to the engineer or programmer. Their purpose is to perform these control operations in a more reliable manner at a lower cost.Ī PLC implements, in its CPU, all of the old hardwired interconnections using its software instructions. ![]() Programmable controllers can implement all of the “old” ladder diagram conditions and much more. Due to wide industry use, they became a standard way of communicating control information from the designers to the users of equipment.Īs programmable controllers were introduced, this type of circuit representation was also desirable because it was easy to use and interpret and was widely accepted in industry. The original ladder diagrams were established to represent hardwired logic circuits used to control machines or equipment. ![]()
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