5PC810.SX05-00 贝加莱 工控机

详情描述：

　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或由多个构成的PLC控制系统中，每一台PLC或每一个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。
 
　　由此可见，该软件模型足以映像各类实际系统：对于只有一个处理器的小型系统，其模型只有一个配置、一个资源和一个程序，与现在大多数PLC的情况完全相符。对于有多个模块插装在同一机架上的中、大型系统，每个模块被视作一个配置，可由一个或多个资源来描述，而一个资源则包括一个或多个程序。对于分散型系统，包含多个配置，而一个配置又包含多个处理器，每个处理器用一个资源描述，每个资源则包括一个或多个程序。
 
　　值得指出的是，这个PLC结构的革命性变化，显然是建立在这个软件模型的理论基础上，要不然PLC还是由一个按扫描方式执行一个程序的那种传统结构。
 
　　至于程序互换的问题，至少到目前为止尚是一个努力的方向。只有在每个PLC的供应厂商所提供的PLC产品都真正遵循IEC 61131-3的标准，而且其编程系统的具体实现又切实符合IEC 61131-8《编程语言的应用和实现导则》，并通过PLCopen这个国际组织对各种编程语言（LD、SFC、FBD、ST和IL）的一致性测试，还要解决不同PLC的存储地址资源的对应互换，才有可能实现名副其实的程序互换。
 
　　PLC硬件和软件的进展，从系统上讲是实现小型化、高速化，以及将信息技术渗入PLC；从硬件上讲是，采用32位RISC的MPU、专用的LSI和多；从软件上讲则是，采用与国际标准IEC 61131-3相对应的工业标准JIS B 3503。
 
　　小型化由于电子工业尤以器件、电路板等硬件见长，所以在PLC系统上实现小型化，可以说早就是起源于，又由他们来推动，并一直乐此不疲、贯彻至今的。小型化的好处是：节省空间、安装灵活、降低成本。
 
　　现今主要PLC厂商生产的模块式中、大型PLC，其典型的外形尺寸要比他们在前一代的同类产品的安装空间要小50-60%。例如三菱电机的小Q系列就比AnS系列的安装空间减少60%。要做到这一点，首先需要开发大规模的专用集成电路芯片（ASIC）来减少芯片的个数，并采用球栅阵列（BGA）以保证在同样封装尺寸下能提供足够多的针脚数。例如，某模块原来用了约700个元器件，通过开发了12种大规模的ASIC（采用BG352的针脚封装）和调整功能，减少了显示用的LED和开关等措施，使元器件减少了一半左右。其次，为减少接插件在印刷电路板上所占的空间，要求接插件的针脚间隔足够小。再次，随着微细加工技术的发展，印刷电路板上的接线布局可实现高密度化、多层化和薄型化，大大提高了元器件的安装率。例如某模块采用了1毫米厚的基板制成8层电路板。由于采取了以上这些措施，使模块由3块印刷电路板变为2块，体积减少了70%，小型化得以较地实现。随着小型化又产生了如何解决小空间的散热设计问题：一是要根据热分析仿真来确定元器件的布置安排；二是主要元器件的电源电压采用3.3V，达到低功耗的目的；三是考虑了通过安装模块的基板，使模块所产生的热量能得到良好散热的机械结构。
 
　　高速化所谓高速化应该包括：运算速度的高速化；与外部设备的数据交换速度高速化，如I/O刷新和网络刷新等；编程设备服务处理的高速化；外部设备的高速响应。
 


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