ABB模块DSQC202工控自动化卡件控制器

ABB模块DSQC202工控自动化卡件控制器

ABB模块DSQC202工控自动化卡件控制器

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。

ABB模块DSQC202工控自动化卡件控制器

The traditional software model of PLC consists of a resource, running a task, controlling a program, and running in a closed system. In the software model of the IEC 61131-3 programmable controller programming language standard, the complete software to solve a specific control problem is summarized as a "configuration" at its upper level.

It refers to a specific type of control system, including hardware devices, processing resources, I/O channel storage address and system capabilities, equivalent to a PLC system application. In a PLC control system consisting of multiple PLCS or composed of multiple PLCS, each PLC or each application is an independent "configuration".

One or more resources can be defined in a configuration. The "resource" can be thought of as the processing means that can execute the IEC program, which reflects the physical structure of the PLC and provides an interface between the program and the physical I/O channel of the PLC. The IEC program can be executed only after the "resource" is loaded. In general, the resource is usually placed in the PLC, but it can also be placed in other systems that support the execution of IEC programs. One or more tasks can be defined within a "resource". A task can be configured to control a set of programs or functional blocks. These programs and functional blocks can be executed periodically or by an event-driven execution.

Thus, the software model is sufficient to map all kinds of real systems: for a small system with only one processor, the model has only one configuration, one resource, and one program, which is exactly the case with most PLCS today. For medium to large systems with multiple modules installed on the same rack, each module is considered a configuration that can be described by one or more resources, and a resource includes one or more programs. For a distributed system, there are multiple configurations, and a configuration contains multiple processors, each described by a resource, and each resource contains one or more programs.