中圖分類號： TN108；TP273
文獻標識碼： A
DOI：10.16157/j.issn.0258-7998.200588
中文引用格式： 劉雪飛,，蘇師師,，蒯亮，等. 基于國產PLC的分布式I/O冗余方法研究[J].電子技術應用,，2021,，47(4)：82-86.
英文引用格式： Liu Xuefei，Su Shishi,，Kuai Liang,，et al. Research on distributed I/O redundancy method based on domestic PLC[J]. Application of Electronic Technique，2021,，47(4)：82-86.

Research on distributed I/O redundancy method based on domestic PLC

Abstract： In order to improve the reliability of the acquisition/output link in the PLC control system, the design principle of the redundant system is analyzed, combined with the field application environment and actual needs, a distributed I/O redundancy method based on domestic PLC is developed. The article introduces the digital input/output and analog input/output redundancy schemes respectively for the type of data collected. This method takes the self-diagnosis results of the self-diagnosis periodically during operation as the basis for redundant diagnosis, combined with the user-configured redundancy scheme to improve accuracy of collecting/outputting data. It can be known from experiments and on-site base application that this method improves the reliability of the PLC control system and can ensure that the PLC system operates stably, efficiently and safely for a long time.

Key words : programmable logic controller(PLC),；reliability,；I/O redundancy；fault diagnosis