Another workaround is to refer to the personal computer architecture in hardware and software, but has changed. For example, Siemens 840D, according to the current MMC, CNC, PLC trinity CNC control machine mode, is a standard IPC industrial computer on the MMC, but the operating system uses Flex OS. The CNC and PLC are concentrated in the NCU. The peripheral interfaces include the spindle, the feed module, and the I/O port. The connection between the 840D and the driver 611D is performed via the bus (the fieldbus profibus is used in the 802D), which is closer to the information transmission mode of the computer. In addition, due to the operating system Flex OS, its operating interface is very similar to a normal personal computer.

The above-mentioned PMAC motion control card and Siemens 840D, etc., they have done a lot of work on the PC-based CNC, but there are still many ways to go from the real open.

The ideal mode should be the mode of industrial computer + real-time operating system + development environment + CNC function library. The CNC control software should be ready for assembly. The object of the assembly is the library function in the CNC function library. The development environment provides users with development tools to incorporate library functions into the real-time operating system. In this way, just as the development of PLC programs has shifted from CNC manufacturers to machine tool manufacturers and CNC integrators, the formation of CNC systems can also be transferred from CNC manufacturers to machine tool manufacturers, integrators, and even end users. This is the open CNC in the final sense.

3 CNC transformation process

The NC transformation process is as follows.

1) When ordering, purchase is mainly based on indicators such as spindle power, feed torque, installation, and I/O points. If the original machine tool has information, it can be better. If it is not, you can only go to the site for actual measurement.

2) The hardware connection should mainly refer to the hardware manufacturer's hardware connection manual.

3) Ladder diagram development mainly refers to the manufacturer PLC programming manual.

4) The debugging is mainly based on the parameter manual and the debugging guide.

In summary, the hardware connection manual, PLC programming, commissioning manual, and parameter manual provided by the CNC manufacturer must be digested. Especially before the first renovation.

As CNC systems become more and more "personal computers", software is often used for CNC debugging. For example, Siemens 840D, the PG programming machine and the PG port of the 840D should be connected with the MPI cable (multi-terminal communication interface) before debugging. There are two debugging contents, one is the PLC basic program application - activate MCP (machine control panel) and axis enable, and the second is machine data MD (ie machine parameter) adjustment.

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