(1) Random Access Memory (RAM) The user can read out the content of the RAM with the programming device, and can also write the user program to the RAM, so the RAM is also called read/write memory. It is volatile memory, and when its power is interrupted, the stored information is lost. A computer's memory module uses RAM.
RAM works at a high speed, is cheap, and is easy to rewrite. Ability to use lithium battery to save user programs and certain data in RAM after PLC power failure. The disadvantage of this plan is that after 1-5 years of use, it is necessary to replace the lithium battery with too low voltage in time.
(2) The contents of the read-only memory (ROM) ROM can only be read out, not written. It is non-volatile, and its power supply is gone, but it can still hold the contents of the store. The ROM is used to store the system program of the PLC.
(3) It can electrically erase programmable read-only memory (EEPROM), also known as E2PROM, which is non-volatile, but it can be programmed with a programming device, and has the advantages of non-volatile ROM and random access of RAM, but the time to write data is much longer than that of RAM. EEPROM is used to host important data for user programs and requirements for a long period of time.
(4) Flash memory (FlashMemory) FlashMemory translated into Chinese is "flashing memory", generally called "flash memory", referred to as "flash memory", it has basically the same characteristics as EEPROM.
Because EEPROM or flash memory has the advantage of being non-volatile and easy to rewrite, the trend is to replace RAM with lithium batteries to stick to data, making PLCs completely unprotected devices. However, some PLCs still use RAM and lithium batteries to store user applications.
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Mitsubishi servo motor alarm code and processing skills
1. Mitsubishi servo drive alarm code AL31.1
Fault analysis: It is the motor overspeed alarm.
Cause analysis: 1. The frequency of a single pulse of the input command is too high;
2. The acceleration and deceleration time is too small, resulting in overshoot and too large;
3. Mitsubishi servo system is unstable;
4. Electricity ...
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Mitsubishi takes instructions and outputs instructions
1) LD (take instruction) A command to connect a normally open contact with the left bus, and every logic line that starts with a normally open contact is used with this instruction;
2) LDI (Reverse Instruction) A normally closed contact is connected to the left bus to the instruction, each ...
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Mitsubishi PLCFX2NCPU plate fault solution
Customer's description of the problem: Mitsubishi FX2N-32MR-001, the PLC running light does not light up after powering on, and the alarm light is always on (hardware problem)
Inspection and repair: turn on the power supply, power on the PLC, according to the detection process, the PLC is in the POWER...
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Mitsubishi inverter installation reactor features
1. Characteristics of the output reactor:
1. It is suitable for reactive power compensation and harmonic control
2. The primary effect of the output reactor is to compensate for the influence of long-line distributed capacitance, and output harmonic current according to the press; 3. ** Ground protection of Mitsubishi inverter and improved power factor, can block from the grid ...
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PLC control system daily maintenance process - Mitsubishi
After overhauling and confirming that all connections of the system are accurate, power on the relevant modules until the card indicator is normal.
The initiation process of the system after the scheduled repair is as follows:
(1) Power supply. Open power supply equipment (including throwing up...
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The weight conversion method of the Mitsubishi weigh module
Component conversion is a process in which an analog signal (load converter output voltage) input from outside the programmable controller is converted into a digital output value and a total component output value, and then stored in buffer memory. After the conversion process, the conversion completion (XE) will change to ON, and the transformation completion mark (Un\G1 ...
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The role of Mitsubishi inverters in energy conservation and emission reduction
1. Descend the starting current of the motor
When the motor is started, due to the influence of inertia and load, there will be a large starting current. This current causes fluctuations in grid voltage and energy additions to the grid. The use of frequency converters can effectively solve this problem. After conditioning inverter ...
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Mitsubishi PLC Step Instruction Instructions for use
1. Step Instruction (STL/RET) Step instruction is an instruction that is specially planned for sequential control. In the field of industrial control, many control processes can be completed by sequential control, and the use of step instructions to complete sequential control is not only convenient to complete, but also easy to read and modify.
There are two in the FX2N ...
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Mitsubishi touch screen common faults and solutions
Fault 1: Mitsubishi touch screen contact deviation
Phenomenon: The direction of finger contact does not match the mouse arrow.
Analysis: When calibrating the orientation after installing the screwdriver, there is no vertical contact with the bull's-eye. Solution: Recalibrate the bearing.
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The GOT widescreen family has been expanded with the GT2512
When industrial automation enters the era of artificial intelligence. Human-computer interaction has long surpassed the simple control of machines, and has been upgraded to obtain more information, use more functions and new skills for more accurate and efficient control, and complete the intelligent manufacturing promotion of industrial automation.
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Mitsubishi inverter fault judgment method
1. UVT problem
UVT is an under-voltage problem, and I believe that many customers will still encounter such problems in use.
The common undervoltage detection point of Mitsubishi inverter is the voltage on the DC bus side, and a low voltage value is sampled after the voltage division of the large resistance resistor, which is compared with the standard voltage value ...
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The difference between the performance of Mitsubishi servo motor and stepper motor
First, the control accuracy is different
The step angle of the two-phase hybrid stepper motor is generally 1.8° and 0.9°, and the step angle of the five-phase hybrid stepper motor is generally 0.72° and 0.36°. There are also some high-performance stepper motors with smaller step angles after subdivision. Communicate the control of servo motor ...
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PLC industrial automation production line construction steps - Mitsubishi
When we select PLC as a controller for the construction of industrial automation production line, we should go through the following process, which is briefly described below:
1. First of all, the demand side, that is, Party A, needs to tell Party B what they want to achieve.
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Mitsubishi PLC has a built-in time adjustment step
1. TWR (Time Write) command
Instructions to write time presets to the built-in real-time clock: Clock information is written to the TWR (Time Write) command. The sequence number of the action instruction is FNC167, [S ·] T, C and D can be used, and only 16-bit operations can be used, accounting for 5 program steps.
The work of the directive ...
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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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Troubleshooting methods for Mitsubishi overload
1. Check whether the motor is heated
If the temperature rise of the motor is not high, the first thing to check is whether the electronic thermal protection function of the Mitsubishi inverter is preset reasonably, if the Mitsubishi inverter still has margin, the preset value should be relaxed; For example, the allowable current of Mitsubishi inverter is now out of margin, not ...
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PLC control cabinet design and use to meet the heat dissipation requirements - Mitsubishi
The PLC control cabinet is the final level of equipment in the power distribution system. It mainly protects, supervises and controls the entire circuit, which is convenient for unified management. The power distribution cabinet is a kind of equipment that can reasonably distribute electrical energy and make the circuit easy to open and close. But because it is a circuit device, the requirements for the level of safety protection ...
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Mitsubishi inverter OC causes the failure
1. The ERR problem is an under-voltage problem, which is usually caused by the problem of voltage detection loop resistance or wiring, rather than the actual input voltage showing undervoltage. Most of the OC problems of the A200 series are caused by the damage of the drive circuit, and its drive circuit ...
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Built-in time adjustment in Mitsubishi PLC
You can use two commands: TWR (Time Write) command and TRD (FNC166) TRD(P) command to adjust the built-in time.
1. TWR (Time Write) command
Instructions to write time presets to the built-in real-time clock: Clock ...
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Which components in the Mitsubishi inverter need to be replaced regularly
Mitsubishi inverter is composed of many electronic parts, such as semiconductor components, etc., in the application and protection involves the replacement of a related component, because of the composition or physical characteristics of the inverter, in a certain period of time will deteriorate, thus reducing the characteristics of the inverter, is ...
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