Ladder Diagram Design Based on Huffman Method for Selection and Assembling Part on Dual Conveyor Plant

Constructing ladder diagrams for very complicated processes such as handling, assembly, welding, loading, unloading, sealing and painting may be possible with heuristic methods, but the success of the heuristic method depends greatly on the experience of the progrmmer. It will be easier to construct the ladder diagram if there is a clear method of steps in constructing the ladder diagram. Especially for newly learning PLC programming language using Ladder diagram. This paper will discuss the application of the Huffman method to construct a ladder diagram that is implemented in Plant Dual Conveyor. Conveyors are often used in manufacturing industry especially for assembly process. Programmable Logic Controller (PLC) acts as conveyor controller with programming language ladder diagram. Ladder diagrams will arrange orders gradually or sequentially. Huffman method is known as a method that aims to minimize the use of relays but the more complex problems handled the more complicated the process. However, by dividing the system into several sub systems then the system can be solved by this method but the goal of minimizing the use of relays becomes less. By using Huffman method, the result from construction of ladder diagram is obtained by 16 rung, 16 timer, 10 relay, and the program capacity is 3 KB.