描述
DS200TCQAG1BFD
PLC的基础技术的进展，主要集中在两个基本方面：执行多任务和程序互换。
所谓执行多任务，就是在一个PLC系统中可同时装几个CPU模块，每个CPU模块都执行某一种任务，控制与其所执行任务相关的I/O模块的存取。其实，按照IEC 61131-3的概念，我们应该更确切地称之为通过多配置执行多任务。例如，三菱电机的小Q系列最多可以在一个机架上插4个CPU模块；富士电机的MICREX-SX系列最多可以在一个机架上插6个CPU模块。这些CPU模块可以是专门用于逻辑控制、顺序控制的，也可以是运动控制用的，还可以是做过程控制用的，上述在Windows操作系统的环境下执行PC机任务的模块，也是供用户选择的一种选项。从某种意义上讲，这也是一种混合式的控制系统。
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，在其最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。
产品承诺：
保 证 全新原装进口,
保 证 安全准时发货，
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优势价格，大量现货。
主营DCS系统配件
机器人系统配件
大型伺服系统配件
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