Hands-On Industrial Internet of Things

Disadvantages of SCADA systems

SCADA systems are much less reliable than PLCs and DCSs. This is because of the following reasons:

• SCADA systems are updated quite frequently to add or change tags, units of measure, scripts, alarm thresholds, and synoptic. This means that SCADA applications have to be restarted often. They usually run on Windows operating systems, so they are also frequently rebooted to apply security patches or other installation tasks.
• SCADA systems are built on several modules that execute different tasks. Sometimes, these might be overloaded and they may drop the communication tasks that are in charge of feeding the I-IoT data stream.
• Connecting directly to a SCADA system implies that we are able to talk to it according ...