We usually classify security into three categories, namely functional security, physical security, and information security.
Functional safety is to achieve equipment and plant safety functions. Protected safety-related parts must perform their functions correctly, and when a failure or failure occurs, the equipment or system must remain safe or safe.
Physical safety is to reduce the damage caused by electric shock, fire, radiation, mechanical hazards, chemical hazards and other factors.
Information security refers to the protection of hardware, software, and database of computer systems through computer technology and network technology. It may not be damaged, changed or leaked by accident or malicious factors. The system can operate normally and enable users. Gain a sense of security in the use of information. The purpose of information security is to protect the security of information stored and processed in an information processing system. Its basic attributes are: integrity, availability, confidentiality, controllability, and reliability. (The authoritative definition of the Computer Information Security Protection Regulations)
It can be seen that the three types of security have great differences in definition and meaning. However, in the context of today's vigorous promotion of "Made in China 2025" and "Industry 4.0", these three types of security are increasingly implemented in a set of industrial control systems, especially information security and functional safety. The system can even be used simultaneously in one product.