功能需求：某些行业和设施需要历史数据库、流线型的报警管理、以及配置通用用户接口的中央控制室。有些则需要制造执行系统(MES)的集成、先进的控制和资产管理。DCS系统内置这些应用，使其很容易被添加到自动化工程应用中，而无需增加独立的服务器，也不会增加集成成本。从这方面讲，DCS系统经济性更高，而且可以提高生产力，降低风险。

　　生命周期****率：设施的需求，因行业而异。对于规模较小的工艺工程，没有扩展需求，也不需要与其它工艺过程区域集成，因此PLC系统具有较好的****率。DCS系统可能具有较高的安装成本，但从全生命周期来看，DCS系统所带来的产量增加和安**益，会抵消一部分成本。

　　平衡短期需求与长期愿景，对操作确定性和改善工厂运行、维护非常关键。

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RELIANCE ELECTRIC POWER MODULE INTERFACE 0-57408-C 0 57408 C 057408C
RELIANCE ELECTRIC POWER MODULE INTERFACE 57408 57408-B 57408B
RELIANCE ELECTRIC Power Module Interface 57408 57408-C 57408 C 57408C
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RELIANCE ELECTRIC PROCESSOR 57407 0-57407-4A 0 57407-4A 4A
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资讯来源：福州卓凯