The Research And Design Of Geotextiles-laying Vessel PLC Control System Based-on Fieldbus

In order to meet the requirement of harnessing Changjiang sea-route, a new type of engineering ship-the geotextiles-laying vessel is born, this ship is used for paving soft body row primarily. Paving soft body row is a new technique used for protecting dyke and managing sea-route. This paper namely researches the geotextiles-laying vessel PLC control system based on fieldbus.First of all, this paper comprehensively introduces the structure of geotextiles-laying vessel system, craft process of the project, as well as control demand and the characteristics of objects. According to control demand, we establish a feasible control scheme based on PROFIBUS networks and programmable logic controller. Secendly this paper analyzes the characteristics of the fieldbus (especially PROFUBUS) and its location in the factory automation systems. As a kind of communication standard in the industrial enviroment, the fieldbus is more suitable for the connection of the spot equipments compared to other networks. The characteristic of control system based on fieldbus can be described as three aspects compared to traditional control system: transmit of digital signal, opening systems, intelligence of spot equipment. Illustrated with the products of SIEMENS Corporation, we study deeply the system structure of PROFIBUS-DP netwoks and pratical problems considerd when using. This paper emphasizes system constitutes, programme methods, hadware composing, communication networks of SIMATIC S7-300 PLC and their applications. The S7-300 series is a line of micro-programmable logic controllers that can control a variety of automation applications. Compact design, low cost, and a powerful instruction set make the S7-300 controllers a perfect solution for controlling medium applications. The wide variety of CPU sizes and voltages and windows-based programming tool give you the flexibility you need to solve your automation problems.The core content of this paper are configuration of geotextiles-laying vessel PLC control system and relevent programme of geotextiles-laying control system using software "STEP7". Through relevant configuration and programme,we have got concrete and profound acquaintance on the fieldbus and PLC control methods. This paper also introduces the principle and styles of touch panel as well as usage of touch panel software "PROTOOL" briefly. ProTool is an innovative configuration software package for the whole SIMATIC HMI family. You use the same configuration software to configure all the devices in the family regardless of the device for which you are creating your project.The full paper finally sum up the key problems that are met in the whole project.