Abstract: Based on the requirements of high-pressure water jet cutting machine for reliable and stable CNC system, Siemens 802S economical numerical control system can greatly improve the machining accuracy of the machine tool, and the operation is reliable and stable, meeting the cutting requirements of the workpiece. This paper briefly discusses the hardware configuration and software structure of Siemens 802S CNC system, as well as its problems in the application of high pressure water jet cutting machine. Keywords: Siemens 802S CNC system, high pressure water jet cutting machine, application I. Introduction: The high-pressure water jet cutting machine is a high-pressure water that uses a special abrasive. The high-pressure water jet is sprayed through the nozzle to cut the workpiece. The cutting efficiency is high and the trimming is neat, which is widely used in light industry and other industries. The control system of the high-pressure water jet cutting machine generally adopts an economical numerical control system to ensure reliable and stable operation. Siemens SINUMERIK 802S CNC system uses 32-bit microprocessor, integrated PLC, separate small-size operation panel and machine control panel. It is an advanced and economical CNC system, which is specially developed for the Chinese market, with less startup data, installation and debugging. Convenient and fast; with Chinese and English menu display, easy to operate and program; with high reliability and strong stability. The high-pressure water jet adopts Siemens SINUMERIK 802S numerical control system, which makes full use of the system's rich error compensation functions, such as screw backlash compensation, screw pitch error compensation, feed axis pulse monitoring, etc., which greatly improves the high pressure water jet. Machine production efficiency. Second, the hardware structure of the CNC system The numerical control system of high-pressure water jet cutting machine mainly includes operation panel (OP020), machine tool panel (MCP), numerical control part (ECU), stepper drive (STEPDRIVE C) and stepper motor, PLC module (DI/O), communication port. . 1. Operation panel (OP020) The operation panel button layout is ergonomically designed for easy and flexible operation. The buttons mainly include menu function keys, letter keys, number keys, and the like. 2. Machine Tool Panel (MCP) The machine panel includes universal control keys and dedicated control buttons for the high pressure water jet cutter. The general control keys mainly include the feed axis movement button, the CNC start stop button, the working mode selection function button, the feed rate selection and the band switch. Dedicated control buttons include high voltage motor start and stop, tool change start and stop, cooling, lubrication, etc. 3. Numerical control part (ECU) The numerical control part mainly includes CPU, ROM, RAM, position control circuit and interface board. The ROM is used to cure the CNC system software, and the RAM is used to store variable data such as stack data and control software temporary data. For the variable data storage area such as CNC machining program and system parameters, it has power-down protection function, so that when the main power supply is not powered, the data is not lost. 4. Stepper drive (STEPDRIVE C) and stepper motor The stepper drive (STEPDRIVE C) is a single-axis controller that controls a five-phase stepper motor. The stepping motor has a step angle of 0.36 degrees. The drive interface uses a 25-pin D-type socket. Each driver accepts three signals, one for the pulse signal, one for the direction signal and one for the enable signal. The pulse is sent to control the motor operation. Each rising edge makes the motor move forward one step. The number of pulses determines the motor rotation angle. The pulse frequency determines the rotation speed of the motor. 5. Input and output part (I/O) The input and output sections mainly include a quick input interface and a PLC module of the numerical control system. Quick inputs include limit proximity switches and NCRDY signals. The NCRDY signal is used as an NC-enabled contactor emergency stop signal. The PLC module I/O includes high pressure start stop, tool change start stop, cooling switch, lubrication switch and so on. 6. Communication port Data communication uses the standard RS-232C for receiving user programs or communicating with computers. It uses a 9-pin D-type socket, and the signal names include: RXD-data reception, TXD-data transmission, RTS-transmission request, CTS-transmission enable, DTR-data transmission equipment ready, DSR-data terminal ready, M-signal . Next page Steel Casters,Steel Caster Wheels,Swivel Caster Wheels,Stainless Steel Caster JIANGSU SHENPAI CASTER CO., LTD , https://www.shenpaicaster.com