Abstract: In Baotou Power Generation Branch of Huadian Inner Mongolia Energy Company Limited, during public data calling process from the units No.1 and No.2, some blue points occurred on the picture, and the system response was slower. Based on field inspection and analysis of the problems existing in public communication network, some concrete measures were adopted, which include regulating the period and phase of the controller, deleting a part of useless configurations, reducing the data acquisition time of the plant level SIS from DCS, avoiding the units No.1 and No.2 to call public data at the same time and so on. The communication load of the public communication network was decreased effectively, which lays a good foundation for safe and stable operation of the units.

Key words: congestion, period and phase, acquisition time, communication load