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Structure Control Language (SCL) is ideally suited for the complex algorithm programming and complex data processing in PLC. The structure of SCL source files is introduced in detail. Taking the standard position-PID control algorithm as an example, the SCL program is compiled. The application of SCL and its software in the algorithm programming is described. The standard function blocks to realize different control algorithm can be easily written and ported. The program written in SCL is succinct, compact and easy to understand.