Since the advent of PLC, after more than 20 years of development, it has become an important industry in industrialized countries such as the United States, Europe, and Japan. In 1987, the sales of PLC in the world was 2.5 billion US dollars, and it has increased at a rate of about 20% every year since then. Since the 1990s, the average annual sales of PLCs in the world has exceeded 5.5 billion US dollars, of which my country accounts for about 1%. At present, PLC has become the most popular industrial control best-selling product in the international market, and it has become a world trend to design automatic control system with PLC.
Comprehensive economic analysis of PLC
In summary, in harsh environments, the use of PLC control mechanism equipment, the automatic control of production lines and production processes will become more and more extensive. However, there are still some problems in the popularization and use of this new type of control device, which are mainly concentrated in two aspects, one is the reliability problem, and the other is the price problem.
Of course, the use of new control devices to realize the transformation of old equipment and automation of the production process, improve labor productivity, and improve enterprise management is a necessary measure to improve the economic benefits of enterprises, but how to properly handle this relationship, this article provides some data for user reference.
Reliability issues
According to the data provided by the relevant information, the average failure-free time of foreign general small and medium-sized PLCs, such as Hitachi, Siemens, and IPM, is as high as 100,000 hours. Even for large PLCs, the mean time between failures is between 40,000 and 50,000 hours. Therefore, manufacturers believe that reliability is no longer a problem. In terms of reliability, relay contactors are unmatched. Therefore, reliability is no longer a technical indicator for Hitachi, Siemens, IPM and other product materials.
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