Data Acquisition System Applicable to Small and Medium Size Thermal Power Plant──Structure and Function Layout

According to actual complexion of small and medium size power plants in China, a project of distributed data acquisition system applicable to them is put forward.This real time data acquisition system has some specific characteristics,such as general purpose data acquisition,distributed HW SW,etc.There are five kinds of circuit card in it,which build up communication control module,pyrology data acquisition module,electric data acquisition module and switch data acquisition module.A new method of pyrology data acquisition using relay is applied.The multi task real time operation system can set the starting time for each task according to its importance.Finally,a set of communication protocol is introduced.It is proved that the protocol is effective in the distributed data acquisition system.