The ability of programmablelogic controller (PLC) to accept programming in ladder diagram format is one of the reasons for its success in the industry. Hence, as PLCs are applied to increasing complicated tasks, and ...
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The ability of programmablelogic controller (PLC) to accept programming in ladder diagram format is one of the reasons for its success in the industry. Hence, as PLCs are applied to increasing complicated tasks, and as people in the electrical industry become more comfortable with computer programming, the use of high-level language for PLC programming is sure to increase substantially. The additions of extended and function block instructions to the basic instructions representing relays, timers, and counters have helped ladder diagram programming to remain a flexible and viable tool for many PLC applications.
The demand and current trends for open systems and information continue to grow. Users are tired of restrictions imposed on them with priority protocols, hardware and software. Manufacturers hear the call to develop l...
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The demand and current trends for open systems and information continue to grow. Users are tired of restrictions imposed on them with priority protocols, hardware and software. Manufacturers hear the call to develop low-cost products based on commercially available technologies. The need for more open communication among systems, at all levels, has been user driven and is a prerequisite for protecting existing capital investments and reducing project costs. The innovative use and immediate utilization of current programmable logic controllers (PLCs)/distributed control systems (DCSs) technology is key in maintaining a competitive edge in a global economy.
The paper presents the development of an educational platform for monitoring electrical parameters in a distribution network and its reconfiguration in the event of a fault. Automating physical processes reduces resta...
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Industries/plants, such as Fibre Optic plant and casting plants, often use programmable logic controllers (PLC) as a two-unit/two- PLC hot standby systems. Optimizing profit and avoiding the major losses are the main ...
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Industries/plants, such as Fibre Optic plant and casting plants, often use programmable logic controllers (PLC) as a two-unit/two- PLC hot standby systems. Optimizing profit and avoiding the major losses are the main objectives of using a two-unit hot standby PLC system. In the two-unit system, one unit is operative and the other is a hot standby. The hot standby unit also fails, but with lower failure rate than the operative unit. The paper outlines a reliability analysis of a two-unit hot standby PLC system, and the real data from an industrial system has been used for the purpose. Four types of failure are seen in the PLCs: input module failure, digital relay burnt/power supply failure, complete unit burnt failure and failure due to corrupted software. The concept of inspection is introduced to detect the type of failure. The model developed is embedded by the types of failure actually depicted in the data and the real failure, repair, replacement, reinstallation rates are used for analysis. Measures of system effectiveness in terms of reliability indices are obtained using semi-Markov processes and regenerative point techniques. Profit incurred to the system is evaluated and related graphs pertaining to the case example are also shown.
Increasingly connected and higher-performing manufacturing plants require corresponding automation advances. While sensors and programmable logic controllers (PLCs) have become smarter over the last decade, not all hu...
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Increasingly connected and higher-performing manufacturing plants require corresponding automation advances. While sensors and programmable logic controllers (PLCs) have become smarter over the last decade, not all human-machine interface (HMI) software experienced the same technological boosts. Now, though, the latest generation of HMI software has many advances including.
Writing programmablelogic controller (PLC) programs from scratch is usually time-consuming and tedious. Many know about the long-term costs and frustrations of debugging and maintaining code, but a method can increas...
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Writing programmablelogic controller (PLC) programs from scratch is usually time-consuming and tedious. Many know about the long-term costs and frustrations of debugging and maintaining code, but a method can increase the code's dependability and quality while streamlining and simplifying the PLC programming process. Multiple PLC platforms can use pre-packaged code to reduce your programming time and support.
A low complexity, fault detecting computer architecture for utilization in programmable logic controllers is designed. The cyclic operating model of PLCs and a specification level, graphical programming paradigm based...
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A low complexity, fault detecting computer architecture for utilization in programmable logic controllers is designed. The cyclic operating model of PLCs and a specification level, graphical programming paradigm based on the interconnection of application oriented standard software function modules are architecturally supported. Thus, by design, there is no semantic gap between the programming and machine execution levels, enabling the safety licensing of application software by an extremely simple, but rigorous method, viz. diverse back translation.
Rotork instruments has been providing the industry with emergency shutdown systems since it was formed in 1970s. Among the systems provided by the company, the antifuse and the in system programmable arrays are the mo...
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Rotork instruments has been providing the industry with emergency shutdown systems since it was formed in 1970s. Among the systems provided by the company, the antifuse and the in system programmable arrays are the most common. Today, both systems are available as plug in configurable logic array modules (clams). These modules are helping the company develop standard solutions for the industry.
The benefits and challenges of networking of programmable logic controllers (PLCs) in industrial plants are discussed. PLC networking enables automation systems to extract critical data from controlled processes and e...
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The benefits and challenges of networking of programmable logic controllers (PLCs) in industrial plants are discussed. PLC networking enables automation systems to extract critical data from controlled processes and equipments and helps the plant personnel in the real time decision making on manufacturing and maintenance operations. It increases the efficiency and reduces the downtime and labor overhead of the operations. Networking of PLCs is not recommended for small systems or when there is no need to get data from PLC because it is expensive.
A report on automation and development of programmable logic controllers (PLC) soft solutions were presented. It was shown that soft PLC solution is part of an environment that is stable enough to control most process...
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A report on automation and development of programmable logic controllers (PLC) soft solutions were presented. It was shown that soft PLC solution is part of an environment that is stable enough to control most processes in any industry. It was observed that there were no boundaries of communication to ERP or MIS systems.
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