SCADA devices do not differ from IT devices in that they also require redundancy, security, reduced costs, and uptime. There are several ways that SCADA in the cloud can be approached and installed, but each has their own potential security issues.
Research on Internet-facing ICS/SCADA systems, who’s really attacking them, and why.
This research paper illustrates who’s really attacking Internet-facing ICS/SCADA systems and why. It also covers techniques to secure ICS/SCADA systems and some best practices to do so.