Software Controller Based on RTLinux

The software controller PLC system based on RTLinux defines the API function in advance, and adopts non-real time layer frame function to call API and realize the corresponding functions. When calling trapezium to edit API, the API system integrates the trapezium edit function. The edited trapezium document is managed and coded by API. The trapezium scans API, the logical calculation is carried out and the results are sent to drive module by reading I/O state and coded trapezium data architecture. The drive module calls different hardware board drive API. At last, the calculation results are written to the hardware board port or read I/O state signal from hardware port.