【導(dǎo)讀】成的概念被引入了。PLC軟件生成的基礎(chǔ)是一個數(shù)字化處理規(guī)劃，它用圖形化的方法描述生產(chǎn)步驟。軟件生成的特殊需求，引入了新的進(jìn)程元素及屬性。所以進(jìn)程規(guī)劃包含了PLC程序所有逐步專業(yè)。本文還給出一種規(guī)格擴(kuò)展——帶有特殊資源PLC功能模塊的數(shù)字處理信息。相應(yīng)的，創(chuàng)新和模型的周期不斷減小。激烈的競爭狀況不可避免地導(dǎo)致在整個。另外，未來生產(chǎn)工程項目成熟的機(jī)會也大大。成，特別是機(jī)械設(shè)計沒有差不多完成之前不進(jìn)行控制工程的設(shè)計。具體部門的條款時這種現(xiàn)象格外明顯。具體部門的差異不可避免的造成信息的丟失，重復(fù)的手動輸入，額外的迭代循環(huán)以及對PLC項目高度的時間壓力。本文中介紹的全自動PLC. 也指出了具體概念的優(yōu)點和不利之處。由于采用了UML，模型發(fā)展的模塊化和結(jié)構(gòu)化有了保障，而為。際場景著目于一個與IEC61131-3相關(guān)的PLC序列運行功能表的自動生成。

　　

【正文】 xist. Errorcausing misunderstandings – especially regarding the later PLC software generation – are the logical consequences of these individual and often ambiguous process descriptions. To remedy this, a clear and universally applicable process plan was developed. This integrated process plan is refined step by step in the planning succession. Finally, it contains all process information from the production planning, mechanical design, robotics and control engineering. Thus, the digital process plan is a simple working medium bining the task results of the involved departments which add their specific contribution to the process design. Furthermore, the process plan has the function as clear and overall documentation medium as well as central munication platform between the different departments. To sum up, Figure 1 portrays the most important goals of the use of an integrated process plan. The integrated process plan describes the production process flow with sequential and parallel processes in a graphical way. So, there are analogies to Sequential Function Charts regarding to IEC 611313. But to generate adequate PLC programs automatically from the integrated process plan, additional process elements and attributes are needed. . Process elements and requirements from IEC 611313 A SFC according to IEC 611313 consists of steps, transitions as well as parallel and alternative logics. So the process plan with sequential and parallel processes has to be refined with logical elements done by the control engineer. Furthermore, a classification in manual and automated processes is necessary because not all processes in the cellspecific production flow are relevant for the later PLC program. Automated processes again have to be divided into robotcontrolled and PLCdriven activities. Additional to these general properties for all process elements, elementspecific attributes are necessary. So for example for alternative and parallel logics the number of branches is required as well as the identification whether they are start or end 2 shows an overview of the required process Elements. Moreover bination of different elements in the process plan has to follow the rules of the IEC 611313, especially the standard for SFC. That means PLCrelevant activities and transitions have to alternate in the process plan. An alternative logic starts after an activity, followed by transitions. Contrary after a start of a parallel logic activities have to follow. The detailed bining rules can be found in [12] or in IEC 611313. . Connection between processes and resources Parallel to the process planning, the resource design takes place. Standardized resource elements for the body shop like clamps, sensors, and valves are stored in libraries. In [13] an approach is described to enhance these mechanical resource elements with electrical and logical information. Among other things resource specific PLC function blocks belong to these logical information. The function blocks describe the resource behavior in the PLC program. Furthermore they contain all necessary I/Osignals from the resource. During the resource design these internal standardized I/Osignals are mapped to cellspecific, nonambiguous signals so that all signal names appear only one time in the whole resource model. In the integrated process plan the several resources with their PLC function blocks are linked to the corresponding process elements. Thus every process “knows” on which resource it is carried out. For example, for a clamping process one valve and at least one clamp are required. Today the connection between processes and resources is used for processdriven simulation studies。 with the new methodology it is also necessary for automated PLC software generation. Hence, the process resource connection has to be acplished for all activities and transitions in the process plan to transfer these information in the later PLC program. . PLC software generation The cellspecific process plan is developed in a top down process by cooperation of the different departments that are involved in the production planning process. So the process plan contains all process relevant planning results of these departments. But for generation of PLC programs, for example manual and robotcontrolled activities are not relevant. That means as the first step the previously developed process plan has to be filtered for only the PLC relevant information. At the export of these information from the process planning tool, the process sequence has to be transformed in a SFC. For the generation of a SFC, the activities in the process plan are transformed into steps in the PLC program, the use of transitions, alternative, and parallel logic is obviously. Additional the SFC has to be connected with the resource specific PLC function blocks. In a PLC program according to IEC 611313 this is done by the function blockspecific I/Osignals that are called up in the SFC. To generate this connection automatically, the export tool has to distinguish between the different process types (e. g clamping processes, unclamping processes). Only this way it is possible to identify which resource signal has to be called up in the process sequence. For example, a clamping activity calls the signal “close” from the valve and an unclamping activity the signal “open”. The export tool also has to identify which output signal of the resource has to be queried in the following transition. That means, after a clamping activity the transition has to query the signal“is closed” from the clamp, after an unclamping activity the signal “is open”. At least, the PLC function blocks linked to the process elements have to be inserted in the PLC program, for example from a mon database. It is not the aim of the presented methodology to generate resources