Generally, there will be more interferences in the field of industrial control, and the field is also more complex, so there are higher requirements for the safety and anti-interference of the control equipment. The control equipment must be able to work normally in a variety of environments, maintain quickly, and maintain rapidly in case of failure. PLC design is specially used in the field of industrial control, so in the design and production of PLC, many anti-interference components and anti-interference measures are added for the complex industrial site that can be effectively solved.