【正文】 ally 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 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 task in the preparation of the different modules with a flexible choice of the characteristics of different programming languages, which means that not only in conventional PLC has been to people familiar ladder, instruction list language can continue to be used on the PCC, but users can be used more efficient and intuitive highlevel language (PL2020), which is a plete text for the control of language, BASIC technical personnel familiar with the syntax it will feel a kind of deja vu, which control requirements for the description of a very simple, intuitive. In addition, PCC39。s hardware I / O channels in a single road, road, or dozens of way more than a decade as a unit module carried out dozens of pointtohundreds of thousands of pointpoint expansion and working. PCC in the industrial control powerful advantages, and demonstrate the programmable controllers and industrial control puters and DCS (Distributed Industrial Control System) technology, the development trend of convergence, although this is still a relatively young technology, but in its more e more and more application areas, it is increasingly demonstrating its potential for development can not be underestimated. For the injection molding machine, the current widespread application of the PLC control system, but as technology advances, personalized, customized products, growing demand for injection molding machine control requirements more plex, higher and higher precision, PCC as a more advanced control system, will gradually occupy a certain market share. On the other hand, for the future workbased production requirements, obviously, PCC control system more petitive edge, so we have reason to believe, PCC control system will be in the future take place in the field of injection molding machines. There are many types of materials that may be used in the injection molding process. Most polymers may be used, including all thermoplastics, some thermosets, and some elastomers. When these materials are used in the injection molding process, their raw form is usually small pellets or a fine powder. Also, colorants may be added in the process to control the color of the final part. The selection of a material for creating injection molded parts is not solely based upon the desired characteristics of the final part. While each material has different properties that will affect the strength and function of the final part, these properties also dictate the parameters used in processing these materials. Each material requires a different set of processing parameters in the injection molding process, including the injection temperature, injection pressure, mold temperature, ejection temperature, and cycle time. A parison of some monly used materials is shown below (Follow the links to search the material library). Material name Abbreviation Description Applications Acetal POM Strong, rigid, excellent fatigue resistance, excellent creep Bearings, cams, gears, handles, plumbing ponents, rollers, rotors, slide guides, resistance, chemical resistance, moisture resistance, naturally opaque white, low/medium cost valves Acrylic PMMA Rigid, brittle, scratch resistant, transparent, optical clarity, low/medium cost Display stands, knobs, lenses, light housings, panels, reflectors, signs, shelves, trays Acrylonitrile Butadiene Styrene ABS Strong, flexible, low mold shrinkage