外文翻譯--可編程控制器-其他專(zhuān)業(yè)(編輯修改稿)
2025-02-24 10:01 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 (For various implementations of the standard, visit ) The IEC 611313 memory model (what the standard calls the software model) is layeredeach layer hides many of the features of the layers beneath. Each of the main elements is now described. The configuration is the entire body of software (program and data) that corresponds to a PLC system. Generally, a configuration equates with the program and data for one PLC. In large plex systems that require multiple cooperating PLCs, each PLC has a separate configuration. A configuration municates with other IEC configuration s within the control system through defined interfaces, called access paths. The choice of the term configuration conflict with the historic use of this term in the controls industry. Generally, configuration refers to the process of specifying items such as the PLC processor model, munication interfaces, remote I/O connections, memory allocation, and so on. Therefore, the vendors producing IECpliant PLCs that use the term configuration in the historic sense refer to the entire body of software with some other term, such as projects. A resource provides the support functions for the execution of programs. One or more resources constitute a configuration. Normally, a resource exists within a PLC, but it may exist within a personal puter to support program testing. One of the main functions of a resource is to provide an interface between a program and the physical I/O of the PLC. A program generally consists of an interconnection of function blocks, each of which may be written
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