可编程工作流程自动控制机床与设备开发与项目(8)

机床电气化系统设计与友好界面的编程开发

Classical coverage criteria, based on control flow graphs, are inadequate when applied to a data flow language function block diagram (FBD) which is a PLC programming language widely used in industry. We propose three structural coverage criteria for FBD programs, analyze relationship among them, and demonstrate their effectiveness using a real-world reactor protection system. Using test cases that had been manually prepared by FBD testing professionals, our technique found many aspects of the FBD logic that were not tested sufficiently. Domain experts, having found the approach highly intuitive, found the technique effective.