| PLC is widely used in industry for its high reliability and performance/price ratio. The configuration software also enjoys fast development due to the popularization of personal computer,and is recognized of the value originated from the merits such as real-time multitasking,openness,flexibility,versatility,and reliability.Based on the work of the innovation project for the proportioning system of No. 3 blast furnace of Hefei Steel & Iron Co.,the paper presents the design of the electrical system,PLC system and the supervision system,and puts the stress on the later two systems.With the Siemens PLC S7-300 and the corresponding programming software STEP7,that helps in control software programming,the proportioning system meets the requirements of automatic proportioning,weighing,loading and weight compensating.The design work uses WinCC,that is also a product from Siemens,to configure the supervisory software,realizing the real-time data-logging,supervising and controlling,as well as various visual HMI with Windows features such as real-time weighing,record checking,alarming,dynamic simulation.PLC and the IPCs in the scheduler room are linked together via Profibus to form a hybrid industry control system,in order to make profit of the unique merits of PLC and IPC.The paper also makes discussion on the measuring devices------weight sensorsand transducers.
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