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This paper briefly reviewed the history of China-made PLC and presented the domestic market situation of PLC, mainstream products of China-made PLC, PLC standards, and relevant national policies. And the existing gaps between foreign and domestic PLC products were analyzed from some aspects including PLC performance indicators, logic programming software, network protocols, product categories, and standardization. Then this paper tried to propose a solution to develop the China-made PLC, combining the characteristics of PLCs of European, American, and Japanese systems. Led by the key projects in the fields of defense industry and critical infrastructure, the China-made PLC will be developed and used based on the domestic independent software and hardware.

Industrial control system(ICS) is widely used in water treatment, power, oil, transportation, military industry and other industries. The safety and stability are related to the normal operation of key national infrastructures. ICS are facing with serious security threats with the advancement of digital production and intelligent manufacturing. This paper proposes and designs a set of in-depth ICS security protection system by discussing the typical attack methods and the weaknesses of existing protection measures，and elaborates its technical focus from five aspects: physical security, data security, network security, host and application security, and control security. And then a comprehensive security protection platform is built on the basis of a trusted platform, forming a set of adaptive, closed-loop, security models and mechanisms that can self-defense and recover, maintain the safety of the ICS in three dimensions.It is helpful for security and stability operation of ICS.