With the expansion of the application field of the programmable logic controller, the reliability requirements of the programmable logic controller system are getting higher and higher, and the strengthening of the safety technology of the programmable logic controller has also become a new development direction. Fault-proof programmable logic controllers with fault-tolerant and redundant performance have appeared, with online pluggable dual-channel signal modules and power modules. Process controllers with built-in redundant CPU systems have also appeared. Instead of redundant I/O modules, process controllers use internal test circuits to check and diagnose the health of I/O modules. GE Fanuc has launched a three-in-one programmable logic controller, which is currently the only high-reliability and safe programmable logic controller in the world that realizes full-series compatibility, hot backup and three-to-two voting.
Problems and Countermeasures in the Development of Programmable Logic Controllers in my country
At present, the development of programmable logic controllers in my country is mainly faced with three problems. First, at the technical level, under the situation of the rapid development of programmable logic controllers in the world, there is no programmable logic controller product with independent intellectual property rights in my country that can participate in international competition. There are certain gaps, such as chip manufacturing, mold processing, etc., which limit our development. The second is the level of competition, which is actually an issue of economic competition. At present, 95% of the domestic market is occupied by foreign programmable logic controllers. Among the medium and large programmable logic controllers, almost all of them are monopolized by several foreign companies. With the continuous expansion of the use of programmable logic controllers in my country , the market is getting bigger and bigger, but several major foreign companies will launch new products for the market almost every year. Once people use the new products, they will gradually increase the market price of the products, and there are no products with our own independent intellectual property rights. , in the economic competition can only be passive. The third is the level of market order. With the deepening of my country’s reform and opening up, especially after China’s entry into the WTO, my country’s huge market share has greatly attracted large foreign companies. Sales channels, each company has dozens or even hundreds of distributors and system integrators, resulting in fierce competition among distributors and system integrators in our country, and these disorderly competitions are the international Large companies divide and conquer to create conditions for stable and high profits.
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