1. Hardware
(1) I/O channeling, the PLC automatically detects the I/O fault and enters the STOP mode.
(2) The I/O is damaged, and the program runs to the response signal that needs the I/O, and cannot execute the instruction downward.
(3) Expansion module (functional, such as A/D) line interference or open circuit, etc.
(4) There is interference or fault in the power supply part.
(5) There is a problem with the connection module and the address distribution module of the PLC.
(6) Faults caused by cables.
2. Software
(1) The loop is triggered.
(2) The program rewrites the contents of the system parameter area, but does not initialize the part.
(3) Maintenance program initiation: hardware maintenance, limit the use time (for payment recovery)
(4) Data overflow, step size is too large, watchdog (DOG time can be corrected) action.
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The basic composition of Mitsubishi PLC
Mitsubishi PLC is composed of power module, CPU module, input module, output module and substrate.
Power module: Provides DC5V power supply for each module on the substrate.
CPU module: It is the heart of the PLC. The CPU module consists of ...
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Anti-interference performance measures of Mitsubishi PLC system
1. Choose a power supply with excellent performance and press the disturbance introduced by the power grid
In the PLC control system, the power supply occupies a very important position. The power grid disturbance series into the PLC control system is mainly through the power supply of the PLC system (such as CPU power supply, I/O power supply, etc.), the power supply of the transmitter and the power supply with P ...
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Mitsubishi PLC power supply live wire and neutral wire short circuit solution
1. First of all, the power supply should be cut off immediately and the circuit should be admitted whether it has been disconnected.
2. Next, check whether the fuse of the power supply is blown or whether the protector is tripped. Replace the fuse or reset the protector. Envy
3. Fuse ...
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Introduction to Mitsubishi PLC network structure
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. The CC-Link fieldbus connection greatly reduces the number of wirings and improves the maintainability of the system. Whereas...
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Mitsubishi inverter pre-use debugging method
1. No-load energizing test of Mitsubishi inverter.
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 the Mitsubishi inverter is normal, if it is not correct.
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Mitsubishi servo system failure problem
The origin position is incorrect, and the encoder debugs/zeros the bit
Replacement bearings, bearing groove wear, rotor cracking, shaft cracking
Gear groove wear
The magnet bursts steel, the magnet falls, gets stuck and doesn't move
Encoder wear, code ...
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Mitsubishi PLC and inverter are communication methods
The output point and COM point of PLC (MR type or MT type) are directly related to the STF (forward rotation engine) of the inverter. overflow-wrap: break-word !important; ">. RH (high speed), RM (medium speed) important; overflow-wrap: break-word !important; ">、R ...
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Mitsubishi FX series PLC fault diagnosis method
1. Power indication (LED indication) When power is supplied to the Mitsubishi PLC root unit, the [POWER] LED indicator light installed on the surface of the root unit turns on. If the power supply is closed but the [POWER] LED does not illuminate, please acknowledge the power wiring. In addition, if the same power supply has a drive sensor, etc. ...
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Mitsubishi servo motor types and advantages
1. DC servo
The structure is simple and easy to operate. However, considering the actual operation, the DC servo motor has introduced mechanical equipment for reversing installation, which increases the cost, has many problems, and is inconvenient to maintain, and often interferes with the production and manufacturing due to the sparks of carbon brushes, and electromagnetic interference will occur. Combine...
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The difference between Mitsubishi FX3u and FX5u
Mitsubishi FX3U series PLC is the third generation of miniature programmable manipulators, using a class of programmable memory for its internal storage programs, to execute logic operations, sequence control, timing, counting and arithmetic operations and other user-oriented instructions, and through digital or analog input/output control of each ...
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The matching relationship between the inverter and the motor - Mitsubishi
It has become an irreversible trend to drive the motor through the inverter, and in the actual application process, because the matching relationship between the inverter and the motor is not very reasonable, it often leads to some problems. When selecting an inverter, you should fully understand the load characteristics of the equipment driven by the inverter. Ms. Ginseng ...
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Differences in the output form of Mitsubishi PLC
Generally, there are three types of Mitsubishi PLC output circuit methods, namely: relay output type, transistor output type and thyristor output type. So what are the characteristics of each of them?
First, the relay output circuit
Use of relays ...
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Introduction to the selection conditions of Mitsubishi A840 series inverters
Q: When will I choose the A840 series inverter?
A: A800 series inverters are generally used in heavy-duty occupations, such as lifting occupations, mixer occupations will use A800 series. At the same time, it is a vector inverter, so customers need to do closed-loop speed control, torque control may ...
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Confirmation and clearing of Mitsubishi inverter FR-CS80 alarm history
When the FR-CS80 inverter detects an abnormality, it will display an error message or alarm in the operation panel according to the abnormal content, or maintain the function action and block the output of the inverter. When maintaining a function operation, please deal with the cause of its operation before resetting the inverter, and then start working. ...
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Mitsubishi servo motor is now commonly used
1. Torque control: Torque control is based on external simulation simulation type or direct address assignment to set the output torque of the motor shaft. For example, 10V matches 5Nm. When the external simulation simulation is set to 5V, the output of the motor shaft is 2.5Nm. If the load on the motor shaft is less than 2.5Nm, ...
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Mitsubishi servo motors achieve precise positioning
The servo control system is a process control system that enables the output of the controlled quantity such as the position, direction, and situation of the block to follow the overall goal (or given value) of the input at will.
So how does the Mitsubishi servo motor maintain precise positioning, how to look at its closed-loop control characteristics, today ...
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Ground leakage current of Mitsubishi inverter and countermeasures thereof
There is electrostatic capacitance between the input and output wiring of Mitsubishi inverters and other wires, between the ground and the motor, and there is a leakage current flow. The leakage current value is affected by factors such as electrostatic capacitance and carrier frequency, and the leakage current is high when the carrier frequency of the inverter is set high and the leakage current is operated under low noise conditions.
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The relationship between torque and performance of Mitsubishi servo motors
1. Additional torque
The torque that occurs on the motor shaft under additional voltage, extra load is called the extra torque of the motor.
2. Starting torque
The torque generated by the motor at the moment when a voltage is applied to the motor in a stopped condition is called the starting torque. The starting torque characterizes the electrical...
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Mitsubishi FR-A840 series inverter is coming "strong".
Mitsubishi Electric Automation Corporation has launched the A800 Series Integrated Inverter Drive (VFD) for fast, reliable, easy-to-use, and easy integration and installation for occupational demand drives. The A800 series variable frequency drive combines traditional induction and permanent magnet vehicles into a single solution that supplies ...
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Mitsubishi FX series PLC master control command
The FX2N has a total of 27 fundamental logic instructions, including 20 fundamental logic instructions of some sub-series PLCs.
Master Control Command (MC/MCR)
(1) MC (Master Control Command) for common tandem contacts ...
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