Fieldbus control system (FCS) has become one of the main technologies used and researched in industrial control system for its openness, decentralization and interoperability.

现场总线控制系统凭借其开放性，分散性和可互操作性等特点，成为目前工业控制系统研究和应用的主流。

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Total Distributed control system (DCS) and FieldBus control system (FCS) are the major system of the process controlled field of industry today.

分散型控制系统(DCS)和现场总线系统(FCS)是当今工业过程控制领域的主流系统。

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OPC specifications and IEC 61499 standard both are protocols of User Layer of FieldBus Control System(FCS), and both are based on software component technology.

OPC规范和IEC 61499标准在现场总线控制系统中均属于用户层协议，二者都基于组件技术。

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