PLC system is how to control CNC machine - - programmable logic

In the numerical control machine tool, many functions are composed of programmable logic controller ( PLC controller programmable controller for short) For control. This unit mainly introduces the application of PLC in the numerical control machine tool. This allows for readers engaged in the work of this item, a basic understanding of master nc machine PLC control object, understand CNC PLC, master the nc machine tool commonly used in the form of the function and working principle of the input/output element.

classification of nc machine tool control

CNC machine tool control is composed of two parts: one part is the location of the axis motion control, the other part is a sequence of nc machine tool machining process control. Talking about the PLC and CNC machine tool and various mechanical parts, machine tool assist device, the relationship between the high voltage lines, often think of CNC machine tool are divided into 'NC side' and 'MT side' ( The machine side) Two parts. 'NC side' includes hardware and software of CNC system and the external devices connected to the CNC system. 'MT side' including the mechanical parts of the machine and its hydraulic, pneumatic, cooling and lubrication, chip removal device, such as machine tool operation panel, relay circuit, the locomotive high-voltage electrical circuit, etc.

PLC controller between CNC and MT, for NC MT lateral side and to the input and output signal processing. The ultimate object of MT side sequence control is with the type of nc machine tools, such as the structure, the auxiliary device of different and there's a big difference. The more the more complex CNC machine body, auxiliary devices, are ultimately controlled object. In general, eventually the number of controlled object and the complexity of the sequence control program from low to high followed by CNC lathe, CNC milling machine, machining center, FMC, FMS.

the configuration of the PLC in the numerical control machine tool of PLC controller in the nc machine tool has three different configuration mode, description is as follows.

( 1) PIC at the side of the machine tool, instead of the traditional relay contactor logic control input/output ( IO) Points, the following figure 1. 1 a) Shown below.

( 2) PLC in electric control, PLC has m an input/output ( The I/O points.

( 3) PLC in electric control cabinet, and input/output interface at the side of the machine tool. This configuration method has greatly reduced CNC and machine interface cable.

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