This paper elaborates on how to solve the problem of zero point loss, how to use a USB flash drive to export machining programs from a computer to a machine tool, and how to back up parameters and PMC data, providing a reference for non-professionals to solve problems such as zero point loss, program transmission, and parameter backup.
1. Introduction
FANUC system is a commonly used system for CNC machine tools in various enterprises and colleges. During use, zero point loss may occur, and problems may occur such as exporting machining programs from a computer to a machine tool, as well as system parameters and PMC parameter backup. Based on experience, the following summarizes the treatment methods for these problems for reference by relevant operators.
2. Zero point loss solution
For FANUC system CNC milling machines/machining centers, if the battery is low for a long time or the battery is replaced in a non-powered state, zero point loss will occur. The alarm interface is shown in Figure 1.
Figure 1 Zero point loss alarm interface
The zero point loss solution is not troublesome, but the order of processing is very important [1]. The details are as follows.
1) In MDI mode, in the OFFSET interface, change the write parameter to 1 (see Figure 2), then switch to the parameter interface (see Figure 3), enter 1815, and press the search number to find the 1815 parameter (see Figure 4).
Figure 2 Turn on the parameter switch
Figure 3 Parameter interface
Figure 4 1815 parameter
2) In MDI mode, first set the 5th bit APC of parameter 1815 to 1 (0th to 7th bits from right to left), so that the blockless zero return method is effective, and then set the 4th bit APZ parameter to 0, shut down and restart.
3) After turning on the machine, in the handwheel mode, shake the X, Y, and Z axes to the zero position to be set, shut down and restart again.
4) Then set the 4th bit APZ parameter to 1 in MDI mode, power off and restart.
If a step is not done correctly, you can do it again from the beginning. Note that the sequence is very important and must not be wrong. If only the battery voltage alarm appears but no DS0300 alarm appears, you only need to replace the battery while it is powered, and there is no need to reset the reference point.
3. How to set up and read programs using a USB flash drive
The specific methods for setting up and reading programs using a USB flash drive are as follows.
(1) Change the channel number Select MDI mode and change the I/O channel to 17 in the OFFSET interface (see Figure 5).
Figure 5 Change the I/O channel to 17
(2) Set the USB flash drive as the current memory Switch to EDIT mode, press the "Directory" soft key on the PROG page to enter the directory interface, press the left and right soft keys on the bottom of the screen to find "Operation", press the "Operation" soft key, and then press "Device" (see Figure 6 for the device interface), press "+" to find "USBMEM" (see Figure 7), and press the "USBMEM" soft key. At this time, the machine tool display content has switched from the internal memory (CNC-MEM) to the USB flash drive.
Figure 6 Equipment interface
Figure 7 USBMEM interface
(3) Select the program to be processed Move the cursor to the program to be selected, then press the "Operation" soft key, turn the page to find "F INPT" (see Figure 8) and press the key, turn the page to find "F Setting", press "F Setting" (see Figure 9), then press "+" to turn the page, find "F Get" and press it (see Figure 10), then press the "Execute" soft key, and the program will be read into the memory.
Figure 8 F INPT interface
Figure 9 F Setting interface
Figure 10 F Get interface
(4) Execute the program Switch to AUTO mode to execute the program.
4. Backup of system parameters and PLC data
The processing program, parameters, pitch error compensation (hereinafter referred to as "pitch compensation"), macro program and PMC data in the FANUC system are saved by the battery on the control unit when the machine tool is turned off. If the battery is dead or other accidents occur, these data will be lost [2]. Therefore, it is necessary to back up important data. Once data is lost, the normal operation of the machine tool can be guaranteed by restoring these data.
Previously, the FANUC system did not support USB flash drives, and the backup of parameters and data was mostly done using RS232C transmission or CF cards [3]. The current FANUC system supports USB flash drives, which are more convenient to use. The following describes the specific methods of using USB flash drives to back up programs, system parameters, PMC and other data.
(1) Exporting programs to USB flash drives Keep channel 17. In EDIT mode, press the "Directory" soft key on the PROG page to enter the directory interface. The storage device is the machine tool internal memory (CNCMEM). Turn the page to find "F OUTPT" and press the button. Turn the page to find "F Setting" and press it. Then press the "Execute" soft key. All programs in the memory will be stored in the USB flash drive. The file name is ALLPROG.
(2) Backup of system parameters and other data In EDIT mode, on the SYSTEM interface, press the "Parameter" soft key, press "Operation", press the page soft key to find "F OUTPT" and press it. Finally, press "Execute" to export the file. The file name is CNCPARA. Similarly, you can export system setting data with the file name SYS-CONF.
(3) PMC data backup In the SYSTEM interface, press the right arrow soft key to turn the page to find "PMCMNT", press "I/O", then press "Operation", look at the first column of PMC devices, the default is to output to the memory card, press the right arrow on the keyboard to move the yellow cursor to the USB memory, press the down arrow on the keyboard to move the cursor to the second column, the function is "Write". The third column is to select the data type to be exported. Select the first item "Sequential Program" to export the ladder diagram, and the second item "Parameter" is to export in digital format. The fourth column is the file name dialog box. You can enter your own file name (such as 123), press "Operation", and then press "Execute", and the PMC data will be backed up to the USB flash drive; you can also press the "File Name" soft key below, and the system will automatically generate a default file name, such as "PMC1" (see Figure 11). Figure 11 PMC data backup
(4) Output and input of screw compensation. Press the diagnostic soft key on the parameter interface, press the "+" soft key to find the screw compensation and press it, then press "Operation" to turn the page to find "F OUTPT" and press it, enter the file name to be stored and press "Execute" to complete the backup [4]. Use the "F INPT" key when inputting.
(5) Data recovery. It mainly includes the recovery of the following two types of data.
1) Recovery of PMC data. Press the right arrow soft key to turn the page to find "PMCMNT", press "I/O", then press "Operation", press the down arrow on the keyboard to move the cursor to the second column, the function is "Read", then move the cursor to the file name dialog box, enter the file name of the previously stored PMC (for example, 123), press "Operation", then press "Execute", the system will display a prompt, press "Execute" again to complete the recovery. It should be noted that the capacity of the USB flash drive is recommended not to exceed 2G, otherwise the machine tool may not be able to recognize it.
2) Recovery of other data. Except for PMC data, the recovery methods of other files are basically the same: first, in MDI mode, turn on the parameter switch, then switch back to EDIT mode, select the data to be restored, press the page key to find "F INPT" and press it, then press "Execute", restart the machine tool to restore the data.
5. Conclusion
This article introduces the solution to the zero point loss of FANUC system CNC machine tools, how to use USB flash drives on machine tools, and data backup and recovery methods. These methods have been verified many times in practice and can quickly and effectively solve the zero point loss problem caused by battery replacement in FANUC system CNC machine tools. The use of USB flash drives also brings great convenience to the data transmission of CNC machine tools. These methods can provide corresponding technical references for CNC professional teaching staff in vocational colleges and front-line CNC machine tool operators and maintenance personnel in enterprises.
References: [1] Beijing-FANUC. FANUC Series 0i-MODEL D FANUC Series 0i-Mate-MODEL D[Z]. 2004. [2] Xu Jie. A brief discussion on CNC system data backup[J]. Science and Technology Innovation Herald, 2015 (8): 230. [3] Liang Guoqiang. Parameter backup and reinstallation of CNC system commonly used in CNC machine tools[J]. China High-tech Zone, 2018 (10): 166, 168. [4] Wang Ruiming. Backup and recovery methods of common CNC system parameters of CNC machine tools[J]. Equipment Management and Maintenance, 2016 (2): 24-26.
This article was published in "Metal Processing (Cold Processing)" 2024, No. 8, pp. 72-74, author: Heze Technician College Lu Kun, Zibo Jiacheng Boiler Technology Co., Ltd. Shen Chunyan, original title: "FANUC machine tool zero point loss and data backup processing method".
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☞Source: Metal Processing ☞Editor: Wang Qian ☞Proofreader: Gao Chenxu ☞Reviewer: Wu Xiaolan ☞Media Cooperation: 010-88379790-801
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