September 2014, Vol. 241, No. 9


Advanced SCADA Ushers In Era Of Anytime, Anywhere Data Access

Human Machine Interface (HMI) has evolved significantly from the days when operations staff had to sit in front of a single screen to monitor a machine or a process. HMI/supervisory control and data acquisition (SCADA) applications now not only monitor and help control equipment and processes, but also provide a huge range of information regarding machine and plant operations. Since many people consider HMI to be a low-end, panel-mounted apparatus, the term SCADA will be used to refer to the more advanced applications discussed in this article. Table 1 lists the ways and SCADA systems provide remote access to users. At the most basic, a panel-mounted HMI with built-in web serve

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