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2025-06-25 22:20 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 pursuit of efficiency, directly affect the speed of transfer mold molding cycle, and quickly transfer to the deceleration control mode in itself has put forward higher requirements. On the other hand, due to special process of continuous development and promotion of position control precision molds have bee increasingly demanding. PLC and PCC Since the late 20th century, 60 the United States the first programmable logic controller PLC inception, PLC control technology has gone through a 30year development process, especially with modern puter technology and microelectronics technology, it has been in the soft hardware technology is far out of the original sequence control of the prototype stage. Programmable Computer Controller (PCC) is to represent the development trend of this new generation of programmable controllers. PLC pared with conventional, PCC is a for motion control, process control and work control of dedicated control system, is a standard PLC, numerical control systems and industrial performance characteristics of the puter in one of the intelligent controller. PCC is its biggest feature is similar to a large puter timesharing multitasking operating systems and diverse software applications design. Most of the conventional singletask PLC clock scanning or monitoring procedures to deal with the process itself of the logic operation instructions and external I / O channel status of collection and refresh. This treatment led directly to control the speed, depends on the size of the application, this result is no doubt that I / O channels in realtime control of the high demand religions. PCC39。s system software the perfect solution to this problem, it uses timesharing mechanism to build their applications multitasking software operating platform, so that the application program running the length of cycle and has nothing to do, but by the decision cycle of the operating system. As a result, it will scan cycle of the application with the real distinction between the external control cycle to meet the real requirements of realtime control. Of course, this control cycle in the CPU puting power to allow the premise, according to the user39。s actual requirements, arbitrary changes. PCC application modules from the multitask structure, the development of application software to the project has brought great convenience. Because it can easily control the project in accordance with the various parts of the different functional requirements, such as motion control, data acquisition, alarm, PID regulator puting, munications, control, namely the preparation of a control program module (task), these modules not only operate independently, the data between one another to maintain a certain interrelated, these modules through the step by step after the independence of the development and debugging can be downloaded to the PCC along with the CPU, in the regulation and management of multitasking operating systems run in parallel under the joint realization of the project control requirements. PCC a single
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