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There was also the development of programming terminals. These innovations allowed PLCs to exchange information with each other. This is the period that saw to the development of the Data Highway by Allen-Bradley and Modbus by Modicon. Thus, a program had to be hand-written or drawn on a drafting board before it was entered later. The initial PLCs did not have a platform for program documentation. There was also the rapid evolving of programming and documentation tools. PLCs were becoming faster and more powerful. Innovation started becoming key to capturing market share. If the temperature is too high AND there is an ingot in only one bay, turn the fan on.īy the time the 70s were coming to a close, Allen-Bradley and other competitors had developed systems that rivaled Modicon. But, if only one ingot is present the oven may become too hot, so a fan is used to cool the oven when it passes a set temperature. When the heater is on it provides enough heat for two ingots. (Source: )Ī heating oven with two bays can heat one ingot in each back. Example of how Boolean can be expressed as Ladder Logic. The engineers would find it easier to understand and use than Boolean Logic. Ladder Logic is essentially a graphic representation of Boolean Logic. Morley’s genius idea was to incorporate ‘ ladder logic’ into his system. This is because whenever relay circuits are drawn between a hot and neutral common, they resemble the rungs of a ladder. The engineers were used to relay control systems which employed ladder diagrams.
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However, plant engineers found them difficult to work with, as compared to relay logic. All computers use this type of logic.ĭespite the simplicity of Boolean Logic and The Genius of George Boole, Boolean Statement programs were okay for computer scientists. At it’s core, it consists of three expressions, AND, OR and NOT.
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Boolean mathematics is the math of ones and zeros, True and False. The others were utilizing ‘Boolean Statements’ to manipulate their equipment.īoolean algebra was by the Irish Mathematician George Boole and presented in The Mathematical Analysis of Logic (1847). What differentiated the Modicon 084 from other products in the market was its programming technique. They began producing the Modicon 084, the first PLC. Modicon PLCįollowing this success, Bedford Associates changed its name to Modicon PLC. When the Modular Controller was tested in General Motors, it showed a 60 percent reduction in downtime. This device met all the requirements the Standard Machine Controller was asking for. Morley, who worked for Bedford associates, designed a device known as the Modular Digital Controller.