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

• Main Authors: Liu Xuefei, Su Shishi, Kuai Liang, Han Qingmin, Wang Shuai, Wu Yunfeng
• Format: Article
• Language: zho
• Published: National Computer System Engineering Research Institute of China 2021-04-01
• Series: Dianzi Jishu Yingyong
• Subjects: programmable logic controller(plc); reliability; i/o redundancy; fault diagnosis
• Online Access: http://www.chinaaet.com/article/3000130639

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.