1. Overview
biaxial tapping machine is mainly used for processing a number of composite materials, mainly milling teeth, and tapping into two processes, such as water supply for milling teeth, and tapping. Now, with real estate construction industry to heat up, the model has been widely used, market prospect.
2. System Description
The system uses a Schneider s professional solutions, according to process requirements, we chose Schneider Twido series PLC TWDLCAA24DRF I / O extension module extension options TWDDRA8RT RS485 communication ATV31 text converter screen XBTN400, following system configuration diagram.
(1) PLC is selected Schneider Twido series, ontology TWDLCAA24DRF + digital extensions TWDDRA8RT, which PLC using 220VAC power supply, 14 Road DI/10 Road, DO, total output for the relay output, output current max 2A, can be expanded to four digital or analog module, to provide users with personalized options, In addition, the expansion of CANOPEN the main module can Twido PLC as CANOPEN main station, high-speed communications; purchase Twido PORT PLC Ethernet module can access the Ethernet.
in this system, PLC control for all the movements, including the frequency of a given inverter, control starting, stopping all movement of interlocking and more. The action consists of manual milling machine teeth, automatic milling teeth, hand tapping, automatic tap, automatic five working modes, and the five modes of each other at any time switch, and various control commands to each other shielding, which requires taking into account the various security measures to prevent malfunction occurred. Schneider solution after use, fully meet customer needs, and improved the old equipment before a number of shortcomings.
(2) We also add a 485 extension option TWDNAC485T, frequency converter for use with ATV31 Modbus communication. Through the Modbus communication, can be set directly in the text screen inverter parameters, such as: LSP, HSP, ACC and other parameters, so that non-professional users because of the need to avoid modifying the processing parameters Er direct right inverter reset, improve equipment security. In addition, Modbus the communication rate set 19.2k baud rate, enough to meet customer needs.
(3) use 4 lines of text screen XBTN400 Schneider as a man-machine interface through which you can set and display parameters, and equipment failure to alarm. The text screen without the need to provide 24VDC power supply, which can be directly Twido PLC s programming port to take 5VDC power supply, the user need do is plug in communication cable can be.
(4) use Schneider Inverter ATV31 as transmission equipment. ATV31 is a cost-effective high frequency converter itself integrated Modbus serial and CANopen interface can be selected according to customer demand. In this application, Twido PLC via Modbus serial bus for communication with the ATV31 control, human-machine interface through the converter parameters can be set and displayed. In addition, ATV31 strong braking performance, in this application, we selected the fast stopping method to meet the customer by the 80HZ speed quickly stop the process requirements.
3. Conclusion
In this system, the use of Twido PLC serial communication with the ATV31, has the following advantages:
(1) The inverter can be read within the many parameters, such as motor current, motor speed, etc., for the frequency converter failure alarm, better maintenance of equipment.
(2) the use of Modbus serial communication control inverter, can avoid the analog control means to cause the drift error.
(3) ATV31 control can be achieved with a given separation, it can guarantee the system in the event of failure to stop.
addition, Twido CANopen module new increase, to achieve high-speed bus.