Software technology for flexible manufacturing systems


The quality of control technology is directly related to the performance and success of FMS, which is the key to flexible manufacturing systems. The function of the software, the quality is directly related to the performance of the control system, taking the unit controller software as an example.
The unit controller is the core mechanism of the manufacturing unit. It can control not only the manufacturing activities of the entire unit, such as coordination, control of all the equipment in the unit, but also the direct relationship between the superior information system, the factory and the workshop control technology. The quality and success of FMS performance is the key to flexible manufacturing systems. The function of the software, the quality is directly related to the performance of the control system, taking the infrared moisture meter unit controller software as an example.
The unit controller is the core mechanism of the manufacturing unit. It can not only control the manufacturing activities of the entire unit, such as coordination, control all the equipment in the unit, but also in the upper level information system—factory, workshop and the next level of workstations. The equipment plays a bridge between the equipment and is the basis for the reliable and efficient operation of the flexible manufacturing system. Therefore, with the development of FMS, especially the development of CIMS, the unit controller software has developed rapidly, whether it is a re-engineer or an application manufacturer. New unit control software is being introduced or introduced, such as Westinghouse Electric, which introduces a new software Unicell for monitoring and controlling FMS manufacturing units, which is a data-driven unit control software for VAX/VMS computers. Up-running, with basic unit control, management and monitoring functions, it can support all manufacturing processes of manual, semi-automatic and fully automatic. Users can easily construct or reconfigure the specific product and processing information as needed. Unit controllers without having to write or update existing in most existing unit control applications And end users can save money, reduce implementation time, and gain flexibility when it comes to application systems, installation, operation, repair, and later expansion or improvement. As another example, Arthur Anderson's CELL-PAC package is a unit production activity control package with an open structure. This software package can command workstation controllers, monitor the working conditions of workstations and production equipment, collect machine and structural data and display production status, structural instructions, graphics and evaluate shop floor activities. If this package is combined with the shop floor, plant-level control system, it can report production status upwards, help the plant complete shop floor scheduling, or transfer work orders down. Issue a request to use or revoke the use of various resources.
In order to facilitate the modification, extension or inheritance of flexible manufacturing system software, control software modularization, standardization has become the main development trend of FMS control system. Many companies, such as ITP Software Ltd., have the goal of replacing custom modular software with standard products where they work.
Software development of a specific system is not only a large investment, a long cycle, low reliability, poor scalability, and difficult to transplant or promote, so software development has become a bottleneck in the development of control systems. As a result, some software companies continue to introduce support development tools called "platforms" to help users complete their own projects with computers. For example, ITP Software Co., Ltd. launched the Mainstream application software development "platform" product, which has various operating systems, such as UNIX, VMS, OS/2 operating systems, various networks such as Ethernet, Decnet, MAP, and various data. Management systems, such as RDB, Ingres, and Oracle database management systems, separate application software from these systems, allowing software developers to focus solely on application research without having to consider connections and communications between devices. This investment can be tied to a dedicated system. This ensures the development of application funds. The "platform" products mentioned here are different from the past, that is, they can refer to hardware or software. At present, people refer to various computer resource operating system networks and data management systems as platforms, while software that implements a specific task based on platforms is called software tools, and various tools integrated software or higher-level integrated software are collectively referred to as ITP companies. Both Mainstream software and IBM's "Distributed Application Editing" software are called platform products. The "Distributed Application Editing" software emphasizes data communication and transmission between industrial computers and personal computers ES/9370S, factory-shop equipment and other computers.
In order to improve the correctness and effectiveness of the control system, people are constantly developing new control software, developing software development tools, and actively introducing new design methods. For example, an object-oriented approach. This design method is a programming method. Based on the concept of information hiding and abstract data types, it treats all resources in the binder system, such as data, modules, and subsystems, as objects, each of which encapsulates the data and methods of implementing data processing. In the design process, it can decompose the problems that the system needs to solve into some information transfer process between objects and objects. It allows the designer to start from the problem domain and naturally transition to the solution domain, using the problem model to construct the application. The design module and the information hiding capabilities of most object-oriented languages ​​contribute to the implementation and modification of the system.

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