A Low Overhead Solution to Resilient Assembly Lines Built From Legacy Controllers

As frequently buying, programming, testing, and utilizing new programmable logic controllers (PLCs) is cost and time prohibitive, many factories utilize legacy systems which are potentially insecure. This letter presents a PLC error detection and correction technique utilizing shifted time redundancy, enabled by a full crossbar connection network. It aims to successfully detect, isolate, and mitigate cybersecurity attacks and faults in PLC devices in a factory setting where multiple parallel assembly lines complete the same task. A trust scoring system is utilized in order to rate each PLC's trustworthiness and reduces necessary overhead.