The Design And Research Of Wind-force Balanced Control System Based On PROFIBUS-DP Feildbus Net

Widely used in the automatic area, feildbus is called computer LAN in automatic area. Following its rising, it is the sign of automatic area comes to a new period, and it will arise big effect and impact in this area.The article introduces a kind of wind-force balanced control system of giving tobacco based on PROFIBUS-DP feildbus net. It can realize the control and observe of the field and give alarm, offer trend analysis. This wind-force balanced control system of giving tobacco based on PROFIBUS-DP net is one of the most practical schemes of industry's application system of tobacco.Substrate control part of the system adoptes Siemens S7-200 series PLC and extended analog blocking, and use the communication blocking the EM277 PROFIBUS-DP link to the PROFIBUS feildbus. Superstratum control part of the system bases on Profibus, Controlnet and DH+three layer networks to carry out the long range control. Use Profibus as substrate of the transmission network, the Controlnet as Superstratum of the transmission network, DH+ as the man-machine interface connection network;Passes the establishment building connection on PanelBuildl400, attaining the purpose of the long range supervision the spot.Obtained the research result as follows:(1) Increase PROFIBUS module in original frame, design the communication program and realize the communication among different kind of PLC in different networks. According to the three layer networks of ProfiBus, ControlNet and DH+ to carry out the long range control, the first floor to deliver the network is the ProfiBus, the ControlNet is the second layer to deliver data in the network, and DH+ is a human-machine interface to connect the network, carry out the purpose of the long range supervision to the field.(2) Design and finish the human-machine interface(HMI), making the system easy to control, operate and maintain. The wind-force balanced control system of giving tobacco adopt a design of observable, making the whole craft process showing on the screen, and using a simple operation to switch to the interface that need to be observed, manage the wind-speed directly.(3) Design and finish Shift-integral arithmetic, making wind-force balanced control system of giving tobacco have good stabilities. When deviation is too big the PID integral calculus function takes off automatically, in order to prevent the saturation of integral calculus to minish super adjust;When deviation is very small the integral calculus function of a PID strengthens automatically again, to remove static error as soon as possible.