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。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。
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,使其硬可靠性与PLC完全相同,只是使用了X86的和芯片组而已。
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