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DCS/PLC and SCADA control systems, though they provide immense capability, share a common weakness. Both are subject to cyber attack from external sources. The potential impact of this vulnerability should not be dismissed. An annunciator system can be put in place that will monitor critical process elements and provide notification of abnormalities. The systems, whether hardwired or software based, are isolated, allowing them to act as a failsafe or backup to the main control and monitoring system.