Dual Redundant Profibus Network Architecture in hot standby fault tolerant control systems

Abstract

This paper presents Dual Redundant Profibus Network Architecture in hot standby fault tolerant control systems. Here, two independent profibus backbones are used to connect main CPU rack with main & redundant I/O racks respectively. In the above fashion, the redundant CPU rack is also configured. This completely prevents the loss of control over process due to multiple failures in I/O communication interfaces in the DACS system. And also redundancy in “Y link” is established to acquire profibus DP slave data. This immensely enhances “the fault tolerant & redundancy” level of communication between PLC to I/O & DP slave. This completely avoids the loss of field I/Os communication due to various failures in profibus network.