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Introduction to Microprocessor-Based Control


The digital integrated circuit (IC) called a microprocessor [Figure 1(a)], has ushered  in a whole new era for control systems electronics. This revolution has occurred because  the microprocessor brings the flexibility of program control and the computational  power of a computer to bear on any problem. Automatic control applications are particularly  well suited to take advantage of this technology, and microprocessor-based  control systems are rapidly replacing many older control systems based on analog circuits  or electromechanical relays. One of the first microprocessor-based controllers  made specifically for control applications was the programmable logic controller (PLC).
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