1. Mitsubishi PLC's analog signal control inverter
Hardware: FX1N, FX2N PLC hosts, 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 a four-output FX2N-4DA module, etc.
Advantages: PLC programming is simple and convenient, the speed control curve is smooth and continuous, and the work is stable.
Defects: In large-scale production lines, the control cable is long, especially when the DA module selects 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, such as controlling 8 inverters, 2 Mitsubishi PLC-FX2N-4DA modules are required, and the cost is 5-7 times that of the selected extended memory communication control.
Second, the switching signal of Mitsubishi PLC controls the Mitsubishi inverter
The output point and COM point of Mitsubishi 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. Mitsubishi 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 complete multi-stage speed operation.
However, because it is controlled by switching quantity, its speed control curve is not a continuous and smooth curve, and it cannot complete fine speed adjustment. This switching control method, its speed regulation accuracy can not be compared with the choice of extended memory communication control.
3. The PLC uses RS-485 modbus-rtu communication method to control the inverter
The new Mitsubishi F700 series inverters use RS-485 terminals to communicate with the PLC using the Modbus-RTU protocol.
Advantages: PLC programming for Modbus communication is simpler and faster than for RS-485 protocol-free methods.
Drawbacks: PLC programming is still a lot of work.
Fourth, Mitsubishi 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-A***P(A) option for Profibus DP fieldbus; FR-A5ND option for DeviceNet fieldbus and much more.
FX series Mitsubishi PLC has a corresponding communication interface module to dock with it.
Advantages: fast speed, long distance, high efficiency, stable operation, simple programming, large number of inverters that can be connected.
Disadvantages: The cost is high, much higher than the cost of using extended memory communication control.
5. The PLC uses RS-485 protocol-free communication method to control the Mitsubishi inverter
This is a commonly used method, and the PLC uses RS serial communication command programming.
Advantages: simple hardware, low cost, can control 32 inverters. Mitsubishi PLC controls the inverter in several ways.
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Mitsubishi FX5U series PLC advantages
1. CPU function
As a MELSEC IO-F series PLC actuator, it is equipped with executable structured programs and multiple program actuators, and can be written to ST language and FB.
2. Built-in analog input and output (alarm output by the way)
Built-in 12-bit 2-channel analog input ...
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How to deal with Mitsubishi PLC failures
01. Base system problem
In Mitsubishi PLC, there are binary, octal, decimal, 10, 2-10 (BCD), etc., we need to master the conversion of 2-8 base.
2-8, remember the binary number from the back, divide every 3 into a group, and each group is converted into octal respectively, such as 1 ...
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PLC troubleshooting method - Mitsubishi
1. If the PLC stops in the middle of some outputs where the output is excited, then look for the signal that caused the next operation (input, timer, line, drum manipulator, etc.). The programmer will show the ON/OFF status of that signal.
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The Mitsubishi QnUDVCPU module records the write function of the settings
The models of QnUDVCPU series products are Q03UDVCPU, Q04UDVCPU, Q06UDVCPU, Q13UDVCPU, and Q26UDVCPU.
Data logging settings can be written to the target memory of the Mitsubishi QnUDVCPU module. When writing data recording settings, you should write data in the purpose of the writing settings.
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The method of Mitsubishi PLC to control the Mitsubishi inverter
The switching quantity control inverter of PLC is selected (that is, the switching output terminal of PLC is directly connected to the switching input terminal of the inverter, and the PLC can control the start, stop, forward and reverse rotation of the inverter and high, medium and low speed multi-stage speed operation through the program).
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One-button adjustment function for Mitsubishi servo motors
After the first installation of different servo motors on the machine, they may be poorly matched to the machine during operation, resulting in vibration, noise and other phenomena.
The cause of the problem is a mismatch between parameters such as the rigidity of the servo motor and the load-inertia ratio and the machinery. Due to the large number of parameters that affect ...
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Classification of Mitsubishi touch screens
At present, Mitsubishi contact screens are generally divided into four categories: resistive contact screens, capacitive contact screens, infrared contact screens and surface acoustic contact screens Mitsubishi servo motors.
1. Resistive contact screen
The screen body of the resistive contact screen ...
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Mitsubishi drive functions and functions
1. Control the start, stop, speed and so on of the servo motor;
2. Carry out various maintenance on the motor (overload, short circuit, undervoltage, etc.)
3. React to external signals and control servo motors (position, speed, torque) through internal PID conditioning;
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Mitsubishi inverter capacity selection
The capacity (non-functional) of the Mitsubishi inverter for the drive motor can be understood from the change in energy flow determined by the operation method.
1. When accelerating or operating at constant speed
The efficiency of the inverter is the output current, that is, how much current the inverter can provide to the motor. Frequency converters ...
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Mitsubishi PLC command negation, empty operation and END, etc
Introduction to Mitsubishi PLC directives such as negation, air operation and END
The INV (Inverse) command is represented by a short 45° slash at the top of the ladder diagram, which negates the result of the operation before the execution of the instruction, and the result of the operation is 0 ...
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![Mitsubishi Step Ladder Instruction [STL], [RET] usage example](https://www.76kj.cn/data/attachment/forum/202202/09/091502z8y488cco444y8ob.jpg)
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Mitsubishi Step Ladder Instruction [STL], [RET] usage example
Step Instruction (STL) is an instruction that uses internal software components to control the process step on top of the sequential control program. A step-to-back instruction (RET) is an instruction that is used to return to the main program (bus) after the state (S) process is completed.
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Mitsubishi PLC communication detection steps
When you are ready to communicate through AJ71QE71, perform the ping procedure in MS-DOS mode to check if the connection is correct before the Mitsubishi PLC's GPPW starts to communicate. Support communication with Weilun touch screen through serial port.
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PLC Reasonable Programming to Eliminate Misoperation - Mitsubishi
(1) Eliminate finger tremor: use the differential instruction DIFU (13) to retrieve the rising edge of the button to send the electrical signal, and the PLC only executes it once in an execution cycle, and then prevent such misoperation;
(2) Unconscious operation:
(1) Optimize the display function and use different fingers...
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Mitsubishi inverter E6 and E7 are faulty
E6, E7 fault for the majority of users must not be unfamiliar, this is a more common Mitsubishi inverter typical problem, of course, the cause of damage is also multifaceted.
IC 1302H02 is damaged, which is a piece of integrated drive ...
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Functional characteristics of Mitsubishi's various series of servo motors
Mitsubishi servo motor system series: MR-J2S series, MR-J3 series, MR-ES series, MR-E series.
Mitsubishi servo motor MR-J2S series
1. The product also has RS-232 and RS-422 serial communication functions, which can be used by a personal computer equipped with servo setting software.
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The role of Mitsubishi inverters
1. Overvoltage maintenance
The output of the motor inverter has the function of voltage detection, and the inverter can actively adjust the output voltage so that the motor does not bear the overvoltage. Even if the output voltage adjustment fails and the output voltage exceeds 110% of the normal voltage, the inverter will stop to maintain the motor.
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How does Mitsubishi PLC work?
1. A scanning cycle is divided into input sampling, program fulfillment, and output rewriting.
2. Each scan process. The convergence samples the input signal. The convergence rewrites the output signal.
3. The inner ...
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Three common communication methods of PLC - Mitsubishi
A PLC network consists of multiple subnets. The communication process of each subnet is determined by the communication protocol. The communication method is the core content of the communication protocol. The means of communication include visit control and data transmission. What are the three common communication methods of PLC?
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Mitsubishi inverter FR-A800 series selection
Q: When will the CS84 series inverter be selected?
A: CS80 series inverter belongs to the diversified function of small intelligent inverter, covering excitation control and general flux vector control, the volume is 57% of the same model, very fast, in some general functions can be used in this model ...
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There are three major classifications of inverters - Mitsubishi inverters
There are several ways to classify frequency converters:
According to the classification of the main circuit operation method, it can be divided into voltage-type inverter and current-type inverter; According to the classification of switching methods, it can be divided into PAM control inverter, PWM control inverter and high carrier frequency PWM control inverter;
In accordance with the ...
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