Test Network Design (IMAGE) Southwest Research Institute Caption SwRI designed an industrial network to detect cyberattacks from a malicious computer. The network utilized the Modbus/TCP protocol to transfer data packets between input/output (I/O) devices and programmable logic controllers (PLCs) connected via an Ethernet switch. Credit Southwest Research Institute Usage Restrictions Images/videos may be used by the media and the public for educational and informational purposes only. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.