JP3317361B2 - Battery backup control method for memory - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method for a battery backup in a data processing apparatus for backing up a memory when a battery backup is abnormal.

[0002]

2. Description of the Related Art As shown in FIG. 5, a controller for controlling a data processing device, for example, a plant or the like, performs basic control of the system (system initialization, system operation monitoring,
A macro program memory 13 for storing an application program 12 for controlling a plant system, a data memory 14, and a micro program memory 15 for storing a micro program.
Processor board 17 comprising a CPU 16 having a built-in CPU
It has.

The system program 11 and the application program 12 are described in a macro language.
These programs are decoded and executed by a microprogram in the CPU 16. This microprogram stores an initial program for initializing the processor board and monitoring the operation.

FIG. 6 is a diagram showing a use area of the data memory 14. The memory area of the data memory 14 is allocated to each of the system program 11, the application program 12, and the micro program as shown in FIG.

Next, the operation of the controller will be described with reference to FIG. When the power is turned on or when the system is reset, the initial program of the microprogram is started, various hardware and software of the processor board are initialized, and the system enters an idle state waiting for a system start command (FIG. 7).

When the start command is accepted, the initial processing of the system program 11 is executed to initialize the entire system (FIG. 7). Subsequently, the application program 12 is executed to start control of the plant. During the execution of the application program 12, the system program 11 is executed by interruption every predetermined period, and the system abnormality detection processing and the communication processing to various hardware of the system are performed (FIG. 7).

In executing the system program 11 and the application program 12, the CPU
The macro instruction is interpreted and executed by the interpreter of the microprogram in 16. In addition, the OS program performs task execution management of various interrupt programs (periodic interrupt, external interrupt, etc.), operation monitoring of the processor board, and the like.

Generally, a micro program and a system program 11 are constituted by a ROM, an application program 12 and a data memory 14 are constituted by a RAM,
The data processing apparatus is provided with a battery backup function that automatically retains the contents of the application program 12 and the data memory 14 even when the power is turned off.

FIG. 8 is a flowchart of a conventional battery backup error process of a microprogram.
After initializing the processor board 17 in the initial processing of the microprogram (S1), the presence or absence of a battery backup error is detected (S2). If a battery backup error is detected, a memory area formed by the RAM of the data memory 14 and the application program memory 12 is cleared (S3), and a system down process is performed (S4).

[0010]

By the way, in a controller or the like for performing plant control, power control, or the like, a system in which application programs are stored in a ROM and a ROM are used.
There are two types of systems stored in the AM, and the former system further has a data memory 1 at the time of initializing.
4 is to store the previous control data, and to clear all the previous control data in the data memory 14 at the time of initializing.

In a system in which all data memories 14 are cleared at the time of initializing, if a battery backup error is detected, the operation is continued without clearing the data memory 14 and then bringing the system down. The processing in S4 becomes unnecessary.

That is, the following three types of controller systems can be considered. (1) The application program is a RAM and the contents of the data memory 14 and the application program memory 12 need to be backed up by a battery. (2) The application program is a ROM and the contents of the data memory 14 need to be backed up by a battery. (3) The application program is a ROM and the data memory 14
It is not necessary to back up the contents of the battery.

Conventionally, in order to correspond to these three types of systems by the microprogram initial processing, separate processor boards, that is, initial processing corresponding to each system, have been conventionally required.

Further, if the application program is RO
In the system M, it is common practice to configure an application program in RAM at the development stage of the system and to change to ROM when debugging is completed.
There is also a problem that different error processing programs are required for the case of ROM and the case of ROM, respectively.

An object of the present invention is to provide a system in which an application program is constructed by a ROM or a RAM so that the same error handling program can cope with the above-mentioned three systems having different memory backup specifications. is there.

[0016]

FIG. 1 is a diagram illustrating the principle of the present invention. In FIG. 1, a detecting unit 1 detects a battery backup abnormality. The detecting means 1 detects whether a battery voltage for backing up a memory is equal to or higher than a predetermined value.

The judging means 2 judges whether the application program is constituted by a ROM or a RAM. The setting unit 3 sets whether the battery backup abnormality is valid or invalid.

The control means 4 stops the operation of the system when the detecting means 1 detects a battery abnormality and the determining means 2 determines that the application program is a RAM, and determines that the application program is a ROM. If the battery backup abnormality is set to be valid based on the setting state of the setting means 3, that is, whether the battery backup abnormality is valid or invalid, the operation of the system is stopped and invalidated. In such a case, the operation of the system is continued as it is.

[0019]

According to the present invention, when the application program is a RAM, the memory is cleared when the battery backup abnormality is detected, and the operation of the system is stopped. Further, when the application program is configured by the ROM and the application program is set to enable the battery backup abnormality, the operation of the system is set to be stopped and disabled. Sometimes the operation of the system is continued.

Thus, the same error processing program can be used in a system in which the application program is composed of a RAM, a system in which the application program is composed of a ROM and the previous control data of the application program is required, or a system that does not require the control data. It is not necessary to provide a plurality of processor boards corresponding to each system as in the related art.

[0021]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a flowchart of the battery backup error processing in the initial processing of the microprogram of the controller according to the embodiment of the present invention. This embodiment relates to a controller for controlling a plant or the like, and its system configuration is basically the same as shown in FIG.

In the initial processing of the microprogram executed when the power is turned on or when the system is reset, first, the voltage of a battery (not shown) for backing up the data memory 14 (see FIG. 5) is detected to determine whether there is an abnormality (FIG. 2). , S11).

If the battery voltage is normal, step S
Then, the process proceeds to step S12 to enter an idle state waiting for a start command. On the other hand, when abnormality of the battery voltage is detected,
After clearing all areas of the data memory 14 (S1
3) It is determined whether the application program is stored in the ROM or the RAM (S)
14).

The application program is a ROM
The determination as to whether the application program is a RAM is made, for example, by separately assigning a storage address of the application program when the application program is a ROM and a storage address when the application program is a RAM, and storing the ROM in the microprogram initial processing. Access the address first,
If significant data cannot be read from the address, it is determined that the application program is stored in the RAM.

It should be noted that if the application program is R
The determination of OM or RAM is not limited to the above method, and various methods are possible. For example, whether the application program is ROM or
It is also possible to set the RAM or not so that the initial processing program reads the state of the switch.

If the application program is stored in the RAM, the process proceeds to step S15 to execute a system down process. In this system down processing, setting of error information, error display, and the like are performed.

If it is determined in step S14 that the application program is stored in the ROM, the flow advances to step S16 to set the battery backup abnormality flag F ₁ (see FIG. 3) in the data memory 14 to "1". After that, the process proceeds to step S12 to enter an idle state waiting for a start command.

Here, the battery backup abnormality flag F ₁ is a flag provided in the data memory area used by the system program, and is normally reset to “0” as shown in FIG. Set to "1" when detected.

When a start command is received in the idle state, the system program is started, and the battery backup error processing shown in FIG. 4 is executed in the initial processing of the system program.

In the system program, first, the system is initialized (S17 in FIG. 4). Next, a battery backup error process (S18 to S20) is performed. Battery backup abnormality flag F ₁ in the data memory area where the system program uses to determine whether it is set (S18). When the flag F ₁ is not set to the (normal), where it ends the initial processing.

[0031] When the battery backup abnormality flag F ₁ is set (F ₁ = ₁₎ in the determination of step S18, then the battery backup setting flag F ₂ is determined whether it is set (S19).

[0032] Here, the application program memory 12, and battery backup setting flag F ₂ is provided, the application program RO
In a system that is stored in M and uses the previous control data when the application program performs plant control, if a battery backup abnormality is detected, continuous operation cannot be performed. Therefore, it is necessary to enable the battery backup abnormality. Therefore, the battery backup setting flag F
₂ is set to “0”. In addition, application
In a system where the program does not use the previous control data, even if a battery backup error is detected,
Since it is necessary to operate after clearing all the data memories 14, it is necessary to invalidate the battery backup abnormality. Therefore, the battery backup setting flag F ₂
Is set to “1”.

The battery backup setting flag F ₂ is "0", that is, when the flag F ₂ is set so as to enable the battery backup error, stops the operation of the system by running the system down process proceeds to step S20 Let it.

On the other hand, the battery backup setting flag F
₂ is "1", that is, when the flag F ₂ is set so as to disable the battery backup error,
Therefore, the initial processing is terminated, and the operation of the system is continued.

As described above, a system in which the application program is stored in the RAM, a system in which the application program is stored in the ROM, and a system that uses the previous control data or a system that does not use the control data are used. Since the same battery backup error processing program can cope with the problem, it is not necessary to prepare a plurality of processor boards each having an error processing program corresponding to each system as in the related art.

In the above embodiment, the battery backup error processing is executed by two types of initial programs, the microprogram 15 in the CPU 16 and the system program 11 in the macro program memory 13. All of the battery backup error processing may be performed in the initial processing of the program, for example, in the initial processing of the system program.

[0037]

According to the present invention, in a system having a battery backup function for a memory and an application program constructed with a RAM or a ROM, the operation of the system is stopped or continued when a battery backup abnormality is detected. Can be dealt with by the same error processing program according to the specifications of the application program.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a flowchart of a battery backup error process of a micro program initial of the embodiment.

FIG. 3 is a diagram illustrating an example of a battery backup abnormality flag and a battery backup setting flag.

FIG. 4 is a flowchart of a battery backup error process of a system program initial.

FIG. 5 is a configuration diagram of a processor board.

FIG. 6 is a diagram showing a use area of a data memory.

FIG. 7 is a diagram illustrating an outline of an operation of a processor.

FIG. 8 is a flowchart of a conventional microprogram battery backup error process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Detection means 2 Judgment means 3 Setting means 4 Control means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-171050 (JP, A) JP-A-62-109148 (JP, A) JP-A-57-157321 (JP, A) JP-A-4- 54548 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G06F 12/16 G06F 15/02 305

Claims (1)

(57) [Claims] A detecting means for detecting an abnormality in a battery backup in a data processing system in which an application program includes a ROM or a RAM;
Determining means (2) for determining whether the application program is configured by a ROM or a RAM; setting means (3) for enabling or disabling a battery backup abnormality; and detecting means (1) If the battery backup abnormality is detected in step (2) and the determination means (2) determines that the application program is configured by the RAM, the operation of the system is stopped, and the application A control unit (4) for stopping or continuing the operation of the system based on the setting state of the setting unit (3) when it is determined that the program is constituted by the ROM; Battery backup control method.