Programmable logic controllers (PLCs) have become the most predominant control elements for the discrete event control of a mechatronics system. Simplification of engineering and precise control of manufacturing process can result in significant cost savings. The most cost-effective way which can pay big dividends in the long run is flexible automation; a planned approach towards integrated control systems. It requires a conscious effort on the part of plant managers and engineers to identify areas where automation can result in better deployment and/or utilization of human resources and savings in man-hours or down time. Controls automation need not be high ended and extremely sophisticated; it is the phased, step-by-step effort to automate, employing control systems tailored to one’s specific requirements that achieves the most attractive results. This is where programmable logic controls have been a breakthrough in the field of automation and control techniques. This report looks at the role PLCs play in these techniques.
A constant demand for better and more efficient manufacturing and process machinery has led to the requirement for higher quality and reliability in control techniques. With the availability of intelligent, compact solid state electronic devices, it has been possible to provide control systems that can reduce maintenance, down time and improve productivity to a great extend. By installing an efficient and user friendly electronics systems for manufacturing machinery or processors, one can obtain a precise and reliable means for producing quality products. One of the latest techniques in solid state controls that offers flexible and efficient operation to the user is programmable controllers. The basic idea behind these programmable controllers was to provide means to eliminate high cost associated with inflexible, conventional relay controlled systems.
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