Abstract: According to the operating principle of control system, some problems occurred at operation of SIEMENS TXP distributed control system in Yangzhou Second Power Generation Corporation Limited were analyzed. The control system were reformed and upgraded, and some regulating measures were adopted. After upgrading, the control system tends to be steady, and failure rate was lowered obviously.

Key words: TXP distributed control system, upgrading and reformation, network structure, operating principle, information processing system