The structure characteristics of nc machine tools with built-in type PLC and main models

'Built-in' type PLC ( Or 'embedded' type PLC, PLC) 'integrated' From belongs to the CNC device, signal transfer between PLC and NC inside the CNC device can be realized. Between PLC and MT is achieved by CNC input/output interface circuit signals ( As shown in figure 1) 。 Figure 1 has a built-in type within the CNC machine tools system diagram of PLC type PLC has the following characteristics: 1) Built-in type of PLC is actually a CNC device with PLC function, usually as a basic or optional functions provided to users. 2) Performance of the built-in type PLC ( Such as: input/output points, the biggest steps, each step execution time, number of scan cycle, instruction functions, etc. ) Specifications of the CNC system is based on the affiliate, performance, apply to the type of machine tools and so on. The part of hardware and software is referred to as the basic function of CNC system or additional features with the CNC system has the function of other unified design, manufacture. As a result, the system hardware and software structure is very compact, and the PLC has pointed, the function of the technical indicators are more reasonable and practical, and is especially suitable for single machine numerical control equipment. 3) On the concrete structure of the system, the built-in type PLC and CNC Shared CPU, a CPU can also be used independently; Hardware control circuit and CNC other circuits can be produced on the same piece of printing plate, also can be made into a additional board separately, when the CNC device requires additional PLC function, then the additional plate instrumentation to the CNC device, built-in PLC is generally not individually configurable input/output interface circuit, but the use of CNC system itself input/output circuit; PLC control circuit and part of the input/output circuit ( General for the input circuit) The power supply provided by the CNC device, do not need another spare power supply. 4) Structure of the built-in type PLC, CNC system can have some advanced control functions. Such as: ladder diagram editor and transmission function, directly within the CNC processing NC window of a large number of information, etc. Since the late 70 s, the world famous CNC manufacturer in the production of CNC products, largely develop the function of built-in type PLC. With the development and utilization of large scale integrated circuit, with and without PLC function, the appearance of CNC gear has no obvious changes in size. In general, the built-in type PLC out the connection between PLC controller and NC, but also has compact structure, good reliability, convenient installation and operation, and after have CNC equipment, and to also purchase a general-purpose PLC as the controller, in comparison with the situation of no matter in technically and economically is advantageous for the user. Foreign companies in domestic production with a built-in type of PLC controller system are: FANUC FS - of the company 0 ( PMC - L／M） FS - 0 Mate（ PMC - L／M） FS - 3 ( PLC - D） FS - 6 ( PLC - A、PLC- B） FS - 10/11 ( PMC - 1) ; FS - 15 ( PMC - N) ; Siemens company SINUMERIK 810, SINUMERIK 820; A - Company B 8200840, 0860, etc.
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