为了解决原有PLC生产过程中手工调试参数校准效率低和测试精度低的弊端,设计并实现了小型PLC自动控制器.详细分析了PLC硬件中AIO模块、DIO模块、PTA模块以及CPU模块的功能,基于这些模块的功能,设计小型PLC自动控制器的模块级自动检测方案,重点分析AIO模块的自动检测过程.描述自动控制器中矩阵开关以及上位机软件的实现过程,采用最小二乘拟合的方法校准AIO模块中的数据,降低系统误差的干扰度,提升检测精度.实验结果表明,所设计自动控制器各测试模块检测方案可行,具有较高的测试精度.%In order to eliminate the disadvantages of low calibration efficiency and low test accuracy of manual debugging parameters in original production process of PLC,a small automatic controller for PLC was designed and implemented. The func-tions of AIO module,DIO module,PTA module and CPU module in PLC hardware are analyzed in detail. The automatic detec-tion scheme in module level of small automatic controller for PLC is designed on the basis of the module functions. The process of automatic detection of AIO module is analyzed emphatically. The realization process of the matrix switch and the host computer software in the automatic controller is described. The least square fitting method is used to calibrate the data in the AIO module to reduce the interference degree of the system error and improve the detection precision. The experimental results show that the detection scheme for each module of the designed automatic controller is feasible and has high test precision.
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