Research on redundant control mode of coordinated controller based on dual control cores

Qiao Sun,Bo Yu,Jie Zhang,Shaokun Jia,Kunpeng Zhao,Zhixiang Li,X Wei

doi:10.1051/e3sconf/202021302006

Abstract

Dual CPU redundant operation of PLC is of great significance to the reliability of industrial automation control system. In view of the problems existing in the traditional dual CPU PLC redundancy control mode based on hardware strategy, this paper proposes a dual CPU redundancy control idea based on software strategy, and describes in detail the specific scheme of Dual CPU redundancy software design using A-B ControlLogix series PLC.

Highlights

Redundancy control is to add standby key equipment in the control system
With the development of computer technology, automation technology and communication technology, most programmable logic controller (PLC) developers put forward the scheme of using dual CPU redundancy to improve the reliability of PLC, which greatly prolonged the fault-free operation time of PLC
The traditional dual CPU redundancy control is completely based on hardware and does not need user programming

Summary

1.Introduction

Redundancy control is to add standby key equipment in the control system. Once the system fails in operation, the control system starts the standby equipment at the fastest speed, so as to maintain the normal operation of the system. Practice shows that the redundancy control of Dual CPU is an effective means to meet the requirements of continuous production and improve the system reliability. The software redundancy method mainly uses the functional redundancy of different components in the system, combined with program design to improve the redundancy of the whole control system, so as to improve the fault-tolerant performance of the system. With the development of computer technology, automation technology and communication technology, most PLC developers put forward the scheme of using dual CPU redundancy to improve the reliability of PLC, which greatly prolonged the fault-free operation time of PLC. The traditional dual CPU redundancy control is completely based on hardware and does not need user programming

Redundant interface

Redundant interface Ex tens io n interface

Update local CPU data

7.Conclusion