800.266.7798 www.inductiveautomation.com White Paper How to Leverage Information Technology and Win the Competitive Advantage 3 Reasons SCADA Software. To sum up this post, the difference between the PLC and SCADA is as follows. SCADA is a system that relies on computers, software and communication media to remotely monitor and control devices in a control system, usually large-scale. SCADA systems are usually data- and decision-driven control systems.