Mitsubishi PLC network structure

1. The equipment layer/fieldbus CC-Link equipment layer is a field network that connects PLC and other control equipment and sensors and drive equipment, which is the low-level network of the entire network system. The CC-Link fieldbus connection is selected, and the number of wiring is greatly reduced, and the system maintainability is improved. Moreover, not only the data of the switching quantity such as ON/OFF, but also the intelligent equipment such as ID system, barcode reader, inverter, man-machine interface, etc., can be realized from the communication of various data to the handling of terminal production information, and the collection and management of the machine operation status has greatly improved the efficiency of maintenance and maintenance. When used in Q series PLCs, CC-Link has better functions and is more concise to use.

Mitsubishi PLC network structure

2. The control layer/MELSECNET/10 (H) is the middle layer of the entire network system, which is a convenient and high-speed control network for processing data exchange between PLC, CNC and other control equipment. MELSECNET/10, as a MELSEC control network, has won high market reviews for its outstanding real-time performance, 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 further adapts to the needs of the market.

3. The information layer/Ethernet (Ethernet) information layer is the highest level in the network system, which is mainly used to transmit production management information, quality management information and equipment working conditions 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 workstation, etc., but also to various FA devices. The Ethernet module of the Q series PLC series has become more and more popular as an e-mail transmission and receiving function on the Internet, so that users can easily send and receive production information e-mails anywhere in the world, and build a long-distance monitoring and management system. Together, using the FTP server function of the Internet and the MELSEC protocol, it is possible to easily upload/download programs and transfer 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 sense of difference in network type and continuity, and long-distance monitoring, correction, and debugging of data communication and programs can be carried out 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, network parameters and various functions can be set on the GXDeveloper software screen, which is simple and convenient.

Mitsubishi PLC network structure

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