The Research Of Monitoring Configuration Software For PLC

In recent years, the configuration software for industrial control system is developing rapidly,and it has a wide range of application because of its powerful features. However, domestic and foreign manufacturers focus on product features, but ignore the custom-made for a device or an industry. To meet the domestic enterprises’ demand for monitoring configuration software, a new monitoring configuration software for PLC is designed in this paper.Through in-depth analysis of domestic and foreign excellent software features and design idea,this paper presents an integral framework for configuration software based on Model-View-Controller design pattern,and designs several key modules,such as graphics system module,the real time database module and the script editor module.The Berkeley DB database is adopted to meet the real time requirements of industrial control. Through the reading and writing speed tests, the BDB can meet the real-time requirements for the general industrial control. Then,we have improved the algorithm of transacti on scheduling and the real-time scheduling performance of the database.An efficient conversion algorithm for the virtual element compilation based on the structure of the cross linked list is proposed. Compared with a post order traversal algorithm based on binary tree storage structure and block recursive partitioning algorithm based on dynamic array storage structure in the time complexity,the conversion algorithm based on the chain linked list method has higher efficiency on the conversion of ladder di agram to instruction list.The database table structures are defined to accommodate other modules. Through the abstraction of the organizational structure of the communication module,the structure of the manager-channel-equipment-package-spot is determined,which contributes to building the bridge between the configuration software and the external device. The exciting thing about this is that we have opened the interface of the device driver,so the user can add the required device driver conveniently.Finally the performance of the software is tested in the laboratory,and the test results show that the software module running normal and it can be put into practical use.