July 2019

Special Focus: The Digital Refinery

Migration of control systems

Since the mid-1980s, distributed control systems (DCSs) have replaced pneumatic and electronic single- or multiple-loop controllers in various plant processes.

Majumder, D., Schneider Electric

Since the mid-1980s, distributed control systems (DCSs) have replaced pneumatic and electronic single- or multiple-loop controllers in various plant processes. Along with digital programmable logic controllers (PLCs) for interlocking and shutdown, DCSs have significantly increased plant operational efficiencies and enhanced productivity. FIG. 1. The key attributes of a typical migration execution plan. Every DCS controller and digital PLC has its own real-time operating system and hardware to meet the basic process control requirements with features and capabilities that may vary from system to system. These unique features and capabilities cha

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