of the PLC simplicity and cost with the sophisticated operator displays, alarm management, and easy but sophisticated configuration capabilities of the DCS.” Most market observers suggest that managers find suppliers that have worked in the field for years. It takes time to build domain expertise in each of these fields.

As the stereotypes of the past are replaced, the convergence of PLC and DCS is opening up a new set of options.  For example, hybrid applications and process plants that traditionally used PLCs to control electrical infrastructure components such as motors, drives, and motor control centers can utilize a DCS for regulatory control.
Those who need hybrid applications may need a process control system which combines the best of the PLC and DCS and a supplier who can provide a common platform that features both discrete and process capabilities.
 
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