Abstract
This paper explores the changing roles of traditional distributed control systems (DCS) and programmable logic controllers (PLC) used to automate cement manufacturing processes. The two technologies initially served two different control requirements. However, improvements in microprocessor-based controllers created conditions for two technologies to merge. The shift toward commercial, off-the-shelf automation technology, software-based control verses hard control and use of non-proprietary networks has created a new class of systems called hybrid process automation systems. In addition, the role of the plant control system has been expanded from just process visualization and control to include process optimization, plant asset management, energy management, and inventory control. Cement plants can now use the process control systems to improve operational and energy efficiency.
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