PXI-6052E NI

DCS的控制器和HMI（人机界面）通常是合二为一的，这也比较适合大型过程控制的监控室，这使DCS更显示出浓厚的PC根源。

 

DCS的控制网络通常都是封闭的，通过一个历史数据库或者网关与外网交互，同时DCS对于工程师站、操作员站的定义比PLC工程体系要更为清晰和明显。

 

PLC：

 

小型微型PLC倒没什么冲突，因为结构和低成本的原因与其它两类产品完全不同。但中大型PLC因为大量使用PC_BASE技术使其与DCS和IPC+软逻辑基本上没有差别，只是因为这些厂商大多之前就是PLC厂商而且客户群都是PLC的客户，所以他的产品就叫PLC。

 

IPC+软逻辑：

 

在十几年前美欧的几个专家在这个问题有过一段很长时间的争论，围绕了一个问题是IPC+软逻辑如何实现才是合理的，因为当时主要有几种声音，一种是完全反对IPC在控制中的使用，因为显而易见的可靠问题，包括操作系统的兼容与可靠如何并重。另一种是完全支持IPC在工控中的应用，并认为要使用标准的PC软硬件，这样才可以使兼容和开放的优点充分体现。后一种是一种折中的方案，把PLC插入IPC内，做为IPC的一个板卡。在实现上面也有这么几种方案：

 

方案一：标准操作系统，包括WINNT（含XP、2000、NT等）、linux、DOS，加软逻辑软件

 

方案二：标准操作系统加PLC卡，这样当电脑死机时控制不会受影响，重启电脑并不影响PLC，同时PLC与PC之间通过共享内存或者双口RAM进行数据交互。使其可以有PC的开放和各种资源同时可以保证控制部分的可靠。

 

方案三：重新设计的硬件系统如模块化结构再加上软逻辑软件，使其硬可靠与PLC完全相同，只是使用了X86的和芯片组而已。

 

方案一，在一些特殊的应用场合有一部分市场，主要是在运控、图像、显示方面有其很大的优点；方案二是一个很保守的做法，但成本方面比较高；方案三其实已经是一个PLC　　1.5、数控系统

 

数控系统的实现目前也有好几种方案：

 

方案一：通用PLC带数控功能

 

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