Have a CNC machine tool system structure and characteristics of independent model of PLC

The independent model of PLC is also called the 'universal' PLC. Independent model of PLC is independent of the CNC device, has a complete hardware and software function, can independently control tasks specified device. The independent model PLC of nc machine tools system block diagram is shown in figure 1: figure 1 CNC machine tool systems with independent model PLC diagram independent model PLC has the following characteristics: 1) Independent model function of PLC controller has the following basic structure: CPU and its control circuit, system program memory, the user program memory, input/output interface circuit and external devices such as the communication interface and programming machine and power supply, etc. ( See figure 5 - 2) 。 2) Independent model PLC usually adopts the modular modular structure or cage plate structure, each function circuit into independent modules, or printed circuit board, is easy to install, features the advantages of easy to expand and change. Communication module can be used, for example, and the external input and output devices, programming, upper machine and lower machine and so on for data exchange; By D/A module can be external control servo system directly; By counting module can use number number of machining, cutting tool, such as degree of rotors turning points for detection and control, adopts the positioning module can be directly to such as knife library, turntable, linear motion axis or device to control the mechanical movement parts. 3) Independent model input and output points of PLC controller I/O module or board allowed flexible configuration. Some independent model PLC through multiple remote terminal connector constitute a network with a large number of input and output points, in order to realize a wide range of centralized control. In the independent model of PLC, the designed for PLC used in FMS, FA and the development of the independent model is a powerful data processing, communication and diagnosis function, mainly used as 'unit controller', is an important control device of modern automation manufacturing system. The independent model of PLC is also used in single machine control. Some CNC machine tool manufacturers abroad, or to show their technical characteristics for a long time, or to keep some technical wizardry, or purely due to the need of management, in the purchase of the CNC system, abandoning the function of PLC, and USES the purchased or developed by independent model of PLC as the controller, this kind of situation in CNC machine imported from Japan, Europe and the United States. The PLC has introduced application of the independent model in China are: Siemens S5 SIMATI C series products of the company; A - B company PLC series products; FANUC PMC - of the company J, etc.
programmable control systems are required in the manufacture of almost every product and plc controller price plc manufacturers is one of the most common machines.
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