1. The switching signal of PLC controls 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 input SG ports of the inverter. The PLC can control the start, stop and reset of the inverter through the program; It can also control different combinations of high-speed, medium-speed and low-speed terminals of the inverter to achieve multi-stage speed operation. However, because it is controlled by switching quantity, the speed control curve is not a smooth curve in succession, and precise speed regulation cannot be realized. The speed control accuracy of this switching control method cannot be compared with the communication control of the extended memory.
2. The analog signal of PLC controls the inverter
Hardware: FX1N, FX2N PLC host, equipped with 1 simple FX1N-1DA-BD extended analog output board; or analog input-output hybrid module FX0N-3A; or FX2N-2DA with two outputs; or FX2N-4DA module with four outputs, etc.
Advantages: PLC programming is simple and convenient, the speed control curve is smooth and connected, and the operation is stable.
Disadvantages: In the large-scale production line, the control cable is long, especially when the DA module selects the voltage signal output, the line has a large voltage drop, which affects the stability and reliability of the system. In addition, from an economic point of view, for example, to control 8 inverters, 2 FX2N-4DA modules are required, and the cost is 5-7 times that of the use of extended memory communication control
3. The PLC uses RS-485 protocol-free communication method to control the inverter
This is the most commonly used method, and the PLC uses RS serial communication instructions for programming.
Advantages: The hardware is simple, the cost is the lowest, and 32 inverters can be controlled.
Disadvantages: Large amount of programming work. From the second chapter of this article, it can be seen that the programming of the communication control of the extended memory is extremely simple, and the technicians who have been engaged in PLC programming can master it in just a few hours as long as they know how to look up the table, and the increased hardware cost is also very low. The ease of programming in this method is incomparable with the method of using RS-485 protocol-free communication to control the inverter.
4. The PLC uses RS-485 Modbus-RTU communication method to control the inverter
Mitsubishi's new F700 series inverters use RS-485 terminals to communicate with the PLC using the Modbus-RTU protocol.
Advantages: PLC programming of the Modbus communication method is simpler and more convenient than the RS-485 protocol-free method.
Disadvantages: The amount of PLC programming work is still large.
5. The PLC uses the fieldbus method to control the inverter
Mitsubishi drives can be built with various types of communication options, such as the FR-A5NC option for CC-Link fieldbuses; FR-A5AP(A) option for ProfibusDP fieldbus; FR-A5ND option for DeviceNet fieldbus and more. Mitsubishi FX series PLC has a corresponding communication interface module to connect with it.
Advantages: fast speed, long distance, high efficiency, stable operation, simple programming, and a large number of inverters that can be connected. String 4
Disadvantages: The cost is higher, much higher than the cost of using extended memory communication control.
To sum up, the method of PLC using extended memory communication to control the inverter does have the advantages of low cost, easy to learn and use, and reliable performance; If the HMI is configured, the parameterization and monitoring of the inverter will become much easier.
The AC variable frequency drive system composed of 1 PLC and no more than 8 inverters is a common small industrial automation system, which is widely used in various industrial fields such as small paper production lines, single-sided corrugated cardboard machinery, plastic film production lines, printing, dyeing, boiling and bleaching machinery, looper metal wire drawing machines, etc. The selection of simple control method can make the project plan have many advantages of communication control, and can save many complicated calculations in RS-485 data communication, so that the project quality and operation efficiency can be greatly improved. However, this simple approach has its drawbacks: it can only control the inverter and not other equipment; In addition, the number of operating inverters is constrained.
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