Software framework of open control systems for industrial automation

This paper proposes a software framework of open control systems for industrial automation,OCSIA software framework for short,which has hierarchical architecture and comprises base drive layer,core control layer and supervisory application layer from bottom to top.Base drive layer is responsible for direct driving physical devices of various kinds of interface types including serial port,parallel port and field bus,and provides top two layers with Hardware Independent Interface in the form of channels as a data server.Core control layer achieves indirect control of physical devices by communicating with base driver layer through channels,monitors system statuses in read-time mode and posts alarm information to supervisory application layer when an exceptional status occurs.Supervisory application layer provides interactive interfaces between system supervisor and system,facilitates system supervisor to supervise and control the whole system in real-time mode.The correctness and feasibility of OCSIA software framework is validated by designing and implementing an instance model of a transfer control system.