Two options to increase the reliability of the system are Redundant SCADA Nodes and Redundant Communication Ports. Commonly used in Industrial plants (like petroleum refineries and power plants), this provides Reliable Automation systems for critical applications.
A Redundant SCADA node consists of primary and backup SCADA nodes, each with SCADA node software, license control file and Hardkey installed. The Project Manager will download an identical run-time database to both primary and backup SCADA nodes (assuming both are on-line). The Primary and backup will communicate with each other when the kernel is started, but only one will communicate to automation hardware. If the Primary fails, the Backup will begin communications to the automation devices. The Web Browser clients will be redirected to the backup if the primary node fails. The redundant SCADA node requires the purchase of two SCADA node licenses.