Within industry today, advancements in process and control technologies have given way to differing control systems in the form of programmable logic controllers (PLCs) and distributed control systems (DCSs). Over the past decade, PLCs have become able to bridge certain gaps within process and control systems that were previously typically found only within DCS environments. This article will provide an overview of various control system strategies and design considerations with regard to both PLC and DCS schemes within petrochemical applications.

中文翻译：

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工业石化应用：可编程逻辑控制器和分布式控制系统的分析

在当今的工业中，过程和控制技术的进步已经让位于可编程逻辑控制器 (PLC) 和分布式控制系统 (DCS) 形式的不同控制系统。在过去的十年中，PLC 已经能够弥合过程和控制系统中的某些差距，而这些差距以前通常只能在 DCS 环境中找到。本文将概述石化应用中 PLC 和 DCS 方案的各种控制系统策略和设计注意事项。