WO2022217625A1

WO2022217625A1 - Method for data protection during power failure and terminal

Info

Publication number: WO2022217625A1
Application number: PCT/CN2021/088260
Authority: WO
Inventors: 郑颖锋; 欧新木; 吕进之; 黄继波
Original assignee: 福州富昌维控电子科技有限公司
Priority date: 2021-04-14
Filing date: 2021-04-20
Publication date: 2022-10-20
Also published as: CN113138653A; CN113138653B

Abstract

Disclosed are a method for data protection during a power failure and a terminal. The method comprises the steps of: when a power failure is detected, packaging preset data into a power failure protection file, and storing same in a non-volatile memory; recording the file creation time of the power failure protection file, performing secondary packaging on the file creation time and the preset data to form a verification file, and storing the verification file in the non-volatile memory; when external powering-on is detected, acquiring first data of the power failure protection file in the non-volatile memory and second data in the verification file; and when the time and the data are verified to be consistent, performing data recovery by using the first data as the preset data, and then running a PLC program. In the present invention, secondary packaging is performed on the file creation time containing the power failure protection file and the preset data requiring power failure protection, such that the reliability of the preset data during a storing process can be verified without calculating a verification code. In other words, data protection during power failure is achieved on the premise of low power consumption.

Description

Power-down data protection method and terminal

technical field

The invention relates to the technical field of industrial automation, and in particular, to a method and a terminal for protecting power-down data.

Background technique

PLC (Programmable Logic Controller, Programmable Logic Controller) is a digital operation controller with a microprocessor for automation control. It is specially designed for applications in industrial environments and can load control instructions into memory for storage at any time. with performing equipment. The programmable logic controller is composed of functional units such as CPU (central processing unit, central processing unit), instruction and data memory, input/output interface, power supply, and digital-to-analog conversion.

For the PLC system, some of the key data or user data need to have the attribute of power failure preservation; when the external power supply is out of power, the PLC detects the power failure signal, and the PLC backup power supply starts to maintain power supply to the PLC equipment. At this time, the PLC stores the key in the microprocessor. Register data or other user-defined data is stored in non-volatile memory. In order to ensure that the data restored when the power is turned on is the data saved before the power failure, the general practice in the industry is to save the check code of the data for verification. The energy storage requirements of the backup power supply are higher, and there is a problem that the data cannot be completely saved due to insufficient energy storage.

technical problem

The technical problem to be solved by the present invention is to provide a power-down data protection method and a terminal, which can realize power-down data protection under the premise of low power consumption.

technical solutions

In order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

Power-down data protection method, including steps:

S1. When a power failure is detected, the preset data is packaged into a power failure protection file, and the power failure protection file is stored in a non-volatile memory;

S2. Record the file creation time of the power failure protection file, package the preset data and the file creation time of the power failure protection file into a verification file twice, and save the verification file in a non- in volatile memory;

S3. When external power-on is detected, obtain the first data of the power-down protection file in the non-volatile memory and the second data in the verification file, where the second data includes the verification time and check data;

S4. When the file creation time of the power failure protection file is consistent with the verification time and the first data is consistent with the second data, use the first data as the preset data to perform Run the PLC program after the data is restored.

In order to solve the above-mentioned technical problems, another technical scheme adopted by the present invention is:

A power-off data protection terminal includes a memory, a processor, and a computer program stored on the memory and running on the processor, and the processor implements the following steps when executing the computer program:

beneficial effect

The beneficial effects of the present invention are: the power-down data protection method and terminal, through the secondary packaging of the file creation time including the power-down protection file and the preset data requiring power-down protection, wherein the file creation time is used to prove the power-down protection. The file has been exactly completed, and the preset data in the secondary packaging is used to verify the preset data in the power-off protection file, so that the reliability of the preset data in the saving process can be realized without calculating the check code. Verification, that is, to realize power-down data protection under the premise of low power consumption.

Description of drawings

FIG. 1 is a schematic flowchart of a power-down data protection method according to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of the power-down data protection method involved in an embodiment of the present invention when the power is turned off;

3 is a schematic flowchart of a power-down data protection method involved in an embodiment of the present invention when powered on;

FIG. 4 is a schematic structural diagram of a power-down data protection terminal according to an embodiment of the present invention.

Label description:

1. Power-down data protection terminal; 2. Processor; 3. Memory.

Embodiments of the present invention

In order to describe in detail the technical content, achieved objects and effects of the present invention, the following descriptions are given with reference to the embodiments and the accompanying drawings.

Please refer to FIG. 1 to FIG. 3 , the data protection method for power failure, including steps:

As can be seen from the above description, the beneficial effect of the present invention is that the file creation time including the power-down protection file and the preset data requiring power-down protection are packaged twice, wherein the file creation time is used to prove that the power-down protection file has been accurately Completed, and the preset data in the secondary packaging is used to verify the preset data in the power-off protection file, so that the reliability verification of the preset data in the saving process can be realized without calculating the verification code. That is, power-down data protection is realized under the premise of low power consumption.

Further, the step S1 specifically includes the following steps:

S11. When a power failure is detected, the CPU immediately enters a low-power consumption mode, adjusts the main frequency of the CPU to the lowest frequency that can be run, closes each application thread, stops updating register data and protects field data;

S12. Package the preset data including the on-site data into a power-down protection file, and save the power-down protection file in a non-volatile memory.

It can be seen from the above description that when the power is lost, the CPU immediately enters the low power consumption mode and stops the application thread and updates the register data, thereby reducing the power consumption of the CPU to the greatest extent and reducing the energy storage requirements for the system backup power supply.

Further, the power failure protection file and the verification file are both BIN files or both HEX files.

Further, the non-volatile memory is eMMC.

It can be seen from the above description that the storage speed of eMMC is fast, which can further reduce power consumption.

Further, the step S4 specifically includes the following steps:

S41, determine whether the file creation time of the power-down protection file is consistent with the verification time, if so, go to step S42, otherwise go to step S43;

S42, judging whether the first data and the second data are consistent, and if they are consistent, then use the first data as the preset data to perform data recovery and then execute a T-shaped chart program, otherwise, execute step S43;

S43. Clear the power-down protection file and the verification file in the non-volatile memory, and restart the T-shape program.

It can be seen from the above description that, by performing double check of time and data, it can be checked whether the preset data is wrong during the power-off saving process, so as to realize power-off data protection under the premise of low power consumption.

Please refer to FIG. 4 , a power-down data protection terminal includes a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements the following steps when executing the computer program:

Further, the step S1 specifically includes the following steps:

Further, the non-volatile memory is eMMC.

Further, the step S4 specifically includes the following steps:

The following embodiments can be applied to any application scenario in a PLC system that requires data protection when power is off.

Please refer to FIG. 1 to FIG. 3 , the first embodiment of the present invention is:

Power-down data protection method, including steps:

S1. When a power failure is detected, the preset data is packaged into a power failure protection file, and the power failure protection file is saved in a non-volatile memory;

In this embodiment, step S1 specifically includes the following steps:

S11. When a power failure is detected, the CPU immediately enters the low power consumption mode, adjusts the main frequency of the CPU to the lowest frequency that can be run, closes each application thread, stops updating the register data and protects the field data;

Among them, the real-time power failure detection is performed by the power failure detection circuit in the PLC system. When a power failure is found, step S11 is executed, thereby reducing the power consumption of the CPU to the greatest extent, that is, reducing the energy storage requirements for the system backup power supply in the PLC system .

S12. Package the preset data including the field data into a power-down protection file, and save the power-down protection file in a non-volatile memory.

Among them, the non-volatile memory is eMMC (Embedded Multi Media Card, embedded multimedia card). In the PLC system, the field data that generally needs to be saved does not exceed 10MB, and the speed of eMMC can reach 400MB/s, so the time to save once is only 0.025 seconds, so that the CPU will not affect the storage speed in low power consumption mode after power failure. , the storage duration is fixed and reliable.

S2. Record the file creation time of the power-down protection file, package the preset data and the file creation time of the power-down protection file twice into a verification file, and save the verification file in a non-volatile memory;

Among them, the power failure protection file and the verification file are both BIN files or both HEX files, the former is binary data, the latter is hexadecimal data, both are acceptable.

S3, when external power-on is detected, obtain the first data of the power-down protection file in the non-volatile memory and the second data in the verification file, where the second data includes verification time and verification data;

When external power-on is detected and the system backup power supply in the PLC system has been charged, data recovery needs to be performed. It is assumed that it is uncertain whether the data of the power-down protection file in the non-volatile memory is the preset data at this time. Therefore, for the convenience of description , the data of the power-down protection file obtained from the non-volatile memory is called the first data, and similarly the data in the verification file obtained from the non-volatile memory is called the second data, and the time in the file is called the second data. and data are called check time and check data, respectively.

S4. When the file creation time of the power failure protection file is consistent with the verification time and the first data and the second data are consistent, use the first data as preset data to perform data recovery and then run the PLC program.

In this embodiment, step S4 specifically includes the following steps:

S41, determine whether the file creation time of the power-down protection file is consistent with the verification time, if yes, then go to step S42, otherwise go to step S43;

S42, determine whether the first data and the second data are consistent, and if they are consistent, then use the first data as preset data to perform data recovery and then execute the T-shaped chart program, otherwise, execute step S43;

S43 , clear the power-down protection file and the verification file in the non-volatile memory, and restart the T-shaped graph program.

That is to say, the file creation time of the once-packed power-down protection file is stored in the secondary-packed verification file, indicating that the primary-packed data has been exactly completed; at the same time, the preset data contained in the secondary-packed verification file is used for verification. The data saved twice are consistent, and it can be checked whether there is an error in the data saving process, so as to realize the reliability check of the preset data in the saving process.

Please refer to FIG. 4 , the second embodiment of the present invention is:

The power-down data protection terminal 1 includes a memory 3, a processor 2, and a computer program stored in the memory 3 and running on the processor 2. The processor 2 implements the steps of the first embodiment when executing the computer program.

To sum up, in the power-down data protection method and terminal provided by the present invention, when the power is turned off, the CPU immediately enters the low-power consumption mode and stops the application thread and updates the register data, thereby reducing the power consumption of the CPU to the greatest extent; The file creation time including the power failure protection file and the preset data that need power failure protection are repackaged, and the power failure protection file and the verification file are quickly stored in the eMMC. The file creation time is used to prove the power failure protection file. It has been exactly completed, and the preset data in the secondary packaging is used to verify the preset data in the power-off protection file, so that the reliability of the preset data can be verified during the saving process without calculating the verification code. The test is to realize power-down data protection under the premise of low power consumption.

The above descriptions are only examples of the present invention, and are not intended to limit the scope of the present invention. Any equivalent transformations made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in related technical fields, are similarly included in the within the scope of patent protection of the present invention.

Claims

A power-down data protection method, characterized in that it includes the steps of:

S1. When a power failure is detected, the preset data is packaged into a power failure protection file, and the power failure protection file is stored in a non-volatile memory;

S2. Record the file creation time of the power failure protection file, package the preset data and the file creation time of the power failure protection file into a verification file twice, and save the verification file in a non- in volatile memory;

S3. When external power-on is detected, obtain the first data of the power-down protection file in the non-volatile memory and the second data in the verification file, where the second data includes the verification time and check data;

S4. When the file creation time of the power failure protection file is consistent with the verification time and the first data is consistent with the second data, use the first data as the preset data to perform Run the PLC program after the data is restored.
The power-down data protection method according to claim 1, wherein the step S1 specifically includes the following steps:

S11. When a power failure is detected, the CPU immediately enters a low-power consumption mode, adjusts the main frequency of the CPU to the lowest frequency that can be run, closes each application thread, stops updating register data and protects field data;

S12. Package the preset data including the on-site data into a power-down protection file, and save the power-down protection file in a non-volatile memory.
The power-down data protection method according to claim 1 or 2, wherein the power-down protection file and the verification file are both BIN files or both HEX files.
The power-down data protection method according to claim 1 or 2, wherein the non-volatile memory is eMMC.
The power-down data protection method according to claim 1 or 2, wherein the step S4 specifically includes the following steps:

S41, determine whether the file creation time of the power-down protection file is consistent with the verification time, if so, go to step S42, otherwise go to step S43;

S42, judging whether the first data and the second data are consistent, and if they are consistent, then use the first data as the preset data to perform data recovery and then execute a T-shaped chart program, otherwise, execute step S43;

S43. Clear the power-down protection file and the verification file in the non-volatile memory, and restart the T-shape program.
A power-off data protection terminal includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the following steps when executing the computer program:

S1. When a power failure is detected, the preset data is packaged into a power failure protection file, and the power failure protection file is stored in a non-volatile memory;

S2. Record the file creation time of the power failure protection file, package the preset data and the file creation time of the power failure protection file into a verification file twice, and save the verification file in a non- in volatile memory;

S3. When external power-on is detected, obtain the first data of the power-down protection file in the non-volatile memory and the second data in the verification file, where the second data includes the verification time and check data;

S4. When the file creation time of the power failure protection file is consistent with the verification time and the first data is consistent with the second data, use the first data as the preset data to perform Run the PLC program after the data is restored.
The power-down data protection terminal according to claim 6, wherein the step S1 specifically includes the following steps:

S11. When a power failure is detected, the CPU immediately enters a low-power consumption mode, adjusts the main frequency of the CPU to the lowest frequency that can be run, closes each application thread, stops updating register data and protects field data;

S12. Package the preset data including the on-site data into a power-down protection file, and save the power-down protection file in a non-volatile memory.
The power-down data protection terminal according to claim 6 or 7, wherein the power-down protection file and the verification file are both BIN files or both HEX files.
The power-down data protection terminal according to claim 6 or 7, wherein the non-volatile memory is eMMC.
The power-down data protection terminal according to claim 6 or 7, wherein the step S4 specifically includes the following steps:

S41, determine whether the file creation time of the power-down protection file is consistent with the verification time, if so, go to step S42, otherwise go to step S43;

S42, judging whether the first data and the second data are consistent, and if they are consistent, then use the first data as the preset data to perform data recovery and then execute a T-shaped chart program, otherwise, execute step S43;

S43. Clear the power-down protection file and the verification file in the non-volatile memory, and restart the T-shape program.