It puts forward reasonable adjustment to each parameter,improvement to process method,strengthening friction lubrication and rational operation to reach the purpose of increasing usage life of expanding head of expander through analysis to pipe expanding process.

This paper introduced the hardware and software characteristics of S7-200 Micro PLC, and illustrated the application of the functions such as timer, interrupt, SCR command, decode and extended modules based on SIMATIC S7-200 in traffic signal control system design.