plc的传统软件模型包括一个资源,运行一个任务,控制一个程序,且运行于一个封闭系统中。而在iec 61131-3可编程控制器编程语言标准的软件模型中,在其Zui上层把解决一个具体控制问题的完整的软件概括为一个“配置”。它专指一个特定类型的控制系统,包括硬件装置、处理资源、i/o通道的存贮地址和系统能力,等同于一个plc系统的应用程序。在一个由多台plc或由多个cpu构成的plc控制系统中,每一台plc或每一个cpu的应用程序就是一个独立的“配置”。在一个“配置”中可以定义一个或多个“资源”。可把“资源”看作能执行iec程序的处理手段,它反映plc的物理结构,在程序和plc的物理i/o通道之间提供了一个接口。只有在装入“资源”后才能执行iec程序。一般而言,通常资源放在plc内,当然它也可以放在其它支持iec程序执行的系统内。在一个“资源”内可以定义一个或多个任务。任务被配置后可以控制一组程序或功能块。这些程序和功能块可以是周期地执行,也可以由一个事件驱动予以执行。
(2).. 美国.. .. ab ..1756系列,1785系列,1746系列,1747系列,1771系列
(3)..瑞士.. ..abb.. 机器人系列,abb advant ocs,abb procontic plc cpu
(4)..法国....施耐德.. 140莫迪康昆腾系列处理器,内存卡,电源模块等。
叁.造纸行业......
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