DCS一般都提供统一的数据库。换句话说，在DCS系统中一旦一个数据存在于数据库中，就可在任何情况下引用，比如在组态软件中，在监控软件中，在趋势图中，在报表中 而PLC系统的数据库通常都不是统一的，组态软件和监控软件甚至归档软件都有自己的数据库。为什么常说西门子的S7 400要到了414以上才称为DCS？因为西门子的PCS7系统才使用统一的数据库，而PCS7要求控制器起码到S7 414-3以上的型号。

S7200CPU中不需要编写任何与通信有关的程序，只需要将要交换的数据整理到一个连续的V存储区当中即可。如果需要在主站中（如S7-300）如何配置S7200CPUMPI从站的详细文档，可访问客户支持部网站上的“网上课堂"网页，在“网络（NET）"目录中《S7-200与S7-300之间的通信》。现场总线还可以处理复杂的事情：本质安全、危险场合、多变量的过程以及法规要求严格的环境。

西门子 6SL3246-0BA22-1BA0 G120控制单元

：

PLC和工控机采用现场总线有以下益处：1、互操作性互操作性定义为在没有任何功能损失的条件下，不同厂家的多个设备可以工作在一个系统中，互操作性允许工厂工程师可在相同的现场总线中集成不同厂家的设备，也允许工程师用别的厂家的设备来替换一台现场总线设备。

2、更低的安装费用现场总线将极大地降低工厂最初的费用，包括简化接线、更少的接线端子排和简化了的仪表选型。此外，减少的费用还有：简化了图纸、简化了控制系统的工程实施、减少了用于连线、接线柜和接线盒的费用。通过把控制功能转移到现场，控制系统的费用也降低了：减少了DCS所需的空间，减少了控制系统的I/O点数，减少了机柜的空间和I/O接线端子排。现场总线将能提供在线的远方数字通讯，可用来实现更快的调试、更快的诊断，降低安装和调试设备的人工费用。

SIMATIC WinCC V7.3 & V7.2 & V7.0

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6AV6381-2AA07-3AX3

6AV6381-2AA07-3AX4

6AV6381-2AB07-3AX3

6AV6381-2AB07-3AX4

Description

6AV6381-2BC07-2AV0

6AV6381-2BD07-2AV0

6AV6381-2BE07-2AV0

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6AV6381-2AA07-2AV4

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6AV6381-2AA07-2AX3

6AV6381-2AB07-2AX4

6AV6381-2AB07-2AX3

6AV6361-1AA01-3AE0

Description

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SIMATIC WinCC 数据库、信息服务器

6AV6361-1AA01-4AA0

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SIMATIC WinCC 能源管理系统

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6DL5101-8CX00-0XB0

SIMATIC WinCC 生产数据管理（PM Add-on）

9AE7110-2SS10-1AA0

9AE7110-2SS20-1AA0

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