1. The equipment layer/fieldbus CC-Link equipment layer is a field network that connects PLC and other control equipment, sensors and drive equipment, which is the lowest layer of the entire network system. CC-Link fieldbus connection is selected, the number of wiring is greatly reduced, and the maintainability of the system is improved. In addition, not only ON/OFF and other switching data, but also can be connected to ID system, barcode reader, inverter, human-machine interface and other intelligent equipment, from the completion of various data communication, to the terminal production information can be completed, plus the collection of machine action status, so that the efficiency of maintenance is also greatly improved. When used in Q series PLCs, CC-Link is more functional and easier to use.
2. The control layer/MELSECNET/10 (H) is the middle layer of the entire network system, which is a control network for convenient and high-speed processing data transfer between PLC, CNC and other control equipment. MELSECNET/10, as a MELSEC control network, has won high market reviews for its good real-time, simple network settings, program-free network data sharing concept, and redundant loops, and the number of devices selected has reached the highest level in Japan and is rare in the world. MELSECNET/H not only inherits the excellent features of MELSECNET/10, but also makes the network more real-time and has a larger data capacity, which is further accustomed to the needs of shopping malls.
3. The information layer/Ethernet (Ethernet) information layer is the middle and highest level of the network system, which is mainly used to transmit production management information, quality management information and equipment operation data between PLC, equipment controller and production management PC, and the information layer uses the most common Ethernet. It can not only connect to Windows PC, UNIX system operation station, etc., but also to various FA equipment. The Ethernet module of the Q series PLC series has the function of sending and receiving e-mails on the Internet, which allows users to easily send and receive production information e-mails anywhere in the world, and build a long-distance supervision and management system. Together, the FTP server function of the Internet and the MELSEC protocol can easily complete the upload/download of programs and the transfer of information.
In addition, in addition to the above-mentioned networks, Q series PLC can also support the networks of other manufacturers such as Profibus, Modbus, Devicenet, ASi, etc., and can also carry out serial communication such as RS-232/RS-422/RS-485, and carry out data transmission and other communication methods through data dedicated lines and telephone lines.
When communicating in Mitsubishi's PLC network, there is no difference or discontinuity in the type of network, and it is possible to carry out long-distance monitoring, correction, and debugging of data communication and programs across networks, regardless of the level and type of network. MELSECNET/H and CC-Link use a cyclic communication method to send and receive messages automatically and periodically, without the need for a special data communication program, only a simple parameter setting. MELSECNET/H and CC-Link use the broadcast method to send and receive circular communication, so that the data on the network can be shared together. For Ethernet, MELSECNET/H, CC-Link networks used in Q Series PLCs, it is easy to set network parameters and various functions on the GXDeveloper software screen.
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(1) If the three-phase voltage of the motor is unbalanced, then check whether the three-phase voltage at the output end of the Mitsubishi inverter is balanced.
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