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 the ON/OFF and other switching data, but also the 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 realized, plus the centralized management of the machine action state, so that the efficiency of maintenance is also greatly improved. When used in Q series PLCs, CC-Link has better functions and is more concise 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 exchange between PLC, CNC and other control equipment. MELSECNET/10, as a MELSEC control network, has won a high evaluation in shopping malls for its good real-time performance, simple network settings, program-free network data sharing concept, and redundant loops, and the number of selected devices 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, with larger data capacity, and further accustomes 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 connect to various FA equipment. The Ethernet module of the Q series PLC series has the function of sending and receiving e-mail on the Internet more and more ubiquitously, so that users can easily send and receive production information e-mails anywhere in the world, and build a long-distance supervision and management system. At the same time, the FTP server function of the Internet and the MELSEC protocol can easily realize the upload/download of programs and the transmission of information.
In addition, in addition to the above-mentioned networks, the 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 through data 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, modification, and debugging of data communication and programs across the network, 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 for circular communication transmission and reception, so that data can be shared on the network. 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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Programming language is traditionally called a ladder diagram. The ladder diagram follows the method of relay control circuit, and it can also be said that the ladder programming language is simplified from the symbol evolution on the basis of the logic control of relays and contactors commonly used in electrical control systems.
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Features of Mitsubishi PLC commonly used models
FX Series PLC: FX3G PLC has a built-in large-capacity program memory, 32K steps, and the basic instruction processing speed can reach 0.21μs in specification mode. In the meantime, the FX series 5U is suitable for any industry, and is used by small and medium-sized enterprises. For example, this year's very popular mask machine is suitable for FX5U, and he can ...
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PLC is different from each output type
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Mitsubishi PLC selection 5 elements
Mitsubishi PLC selection - element 1: IO points
The number of ZUI IOs that can be accessed by the Mitsubishi PLC control system.
Mitsubishi PLC FX series now commonly used basic unit host is: FX1SFX1N, FX1NC, FX2N, FX2NC, FX3U. FX3UCFX3G, FX5U, 9 series.
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Mitsubishi PLC advantages
Discrete control and motion control, Mitsubishi's instructions are abundant, there are dedicated positioning instructions, control servo and stepping are easy to complete, to complete some messy action control is also Mitsubishi's strength, and Siemens is weaker in this area, there is no special instruction, do servo or step positioning control is not ...
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The three output types of PLC are: transistor output, thyristor output and relay output, what is the difference between these three different output types?
(1) Transistor output:
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Mitsubishi Electric appeared at the 2021 China Smart Expo
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Mitsubishi PLC controls the control method of the inverter
1. Use the switching signal of PLC to control the inverter
The output point and COM point of the PLC (MR type or MT type) are directly connected to the STF (forward engine), RH (high speed), RM (medium speed), RL (low speed), and SG input ports of the inverter. The PLC can control the inverter through the program.
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There is no self-locking reason for the Mitsubishi servo motor to be turned on
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Mitsubishi servo controller AL512 alarm
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2. The torque constraint value is abnormal. Solution: Increase the torque constraint value to investigate whether it returns to normal.
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Mitsubishi inverter heat dissipation causes and countermeasures
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Mitsubishi inverter pre-use debugging steps
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1. Ground the ground terminal of the Mitsubishi inverter.
2 Connect the power input terminal of the Mitsubishi inverter to the power supply through the leakage maintenance switch.
3 Check whether the factory display window of Mitsubishi inverter is normal, if it is not correct.
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PLC circuit debugging precautions - Mitsubishi
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The matching relationship between the inverter and the motor - Mitsubishi
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Mitsubishi PLC commonly used circuit programming application
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