P0901AK FOXBORO

Description

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性问题，包括操作系统的兼容性与可靠性如何并重。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，这样才可以使兼容性和开放性的优点充分体现。最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的开放性和各种资源同时可以保证控制部分的可靠性。

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