JP2007299126A - Controller and program for controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To certainly store log information required by a user without performing overwriting into the necessary log information stored in a circulation type storage device. <P>SOLUTION: This controller is provided with: a program execution means executing a program including a function program; a circulation type storage means storing information by cyclic use of a storage area; a logging information setting storage means storing stop factor information set with a factor causing a stop of the storage of the log information of the program execution means; an output information monitoring means deciding accordance between the stop factor information, and the log information, a return value and an identifier of the function program; a logging control means outputting a logging stop instruction to stop the storage of the log information by a decision result of the output information monitoring means; and logging processing means making the circulation type storage means store the log information, and stopping the storage of the logging information when receiving the logging stop instruction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a control device having a function of taking a log that is a record of a control situation, and more particularly to a control device that stores log information in a circular storage device that stores information by using a storage area in a circulating manner. .

  In a control device having a function of logging to a conventional circular storage device (ring buffer), logging stop interrupt generating means for generating an interrupt according to the type of abnormality detected by the protocol control unit that performs control related to the protocol; If there is an interrupt by the line logging stop means for automatically stopping the collection of log information and the logging stop interrupt generating means, and the logging function automatic stop option is selected in advance, the logging function is added to the line logging stop means. There is a line logging automatic stop control method in a system that controls network communication including an interrupt processing unit that notifies the stop of the network (for example, Patent Document 1).

  According to this configuration, the logging function is stopped by the line logging stop processing unit when the protocol control unit uses the logging stop interrupt generating unit according to the type of abnormality. Therefore, the line log information at this point is not lost because new log information collected after the error occurs is overwritten in the ring buffer.

Japanese Patent Laid-Open No. 1-115244

  In the conventional line logging automatic stop control method, the line logging is automatically stopped by generating an interrupt due to an abnormality detected by the protocol control unit that controls the protocol. However, this method has a problem that the log information originally necessary for the user cannot be logged because the logging is stopped even if the abnormality detected by the protocol control unit is an abnormality that the user does not need. In other words, the conventional method ignores the abnormality generated from the lower level protocol and stops the logging based on the abnormality of the upper level protocol control. If this method is applied to program execution and logging is stopped based on an abnormality from a higher-level program, logging is stopped due to an abnormality in the higher-level program that is not intended by the user during program verification. Information cannot be retrieved.

  The present invention has been made to solve the above-described problems, and the necessary log information can be reliably logged by the user without overwriting the necessary log information stored in the circular storage device. The purpose is that.

  In the control device according to the present invention, program execution means for executing a program including a function program, circulation type storage means for storing information by cyclically using a storage area, and factors for stopping storage of log information by the program execution means Logging information setting storage means for storing the set stop factor information, output information monitoring means for determining the match between the stop factor information and the identifier and return value of the function program or the log information, the judgment result of the output information monitoring means Logging control means for outputting a logging stop command for stopping storage of the log information, and storing the log information in the circular storage means and stopping storing the log information upon receipt of the logging stop command Logging processing means is provided.

  According to the present invention, in the device that stores the log information in the circular storage device, the logging to the log information in the circular storage device required by the user is stopped by stopping the logging with the logging stop factor information set by the user. Since overwriting can be prevented, the user can surely obtain necessary log information.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a control device according to Embodiment 1 for carrying out the present invention. The control apparatus according to the first embodiment executes a program including a function program, and cyclically uses a storage area for program execution means 201 that outputs a return value of the function program and log information to be recorded for each function program. The logging type storage means 202 for storing the information, and the stop factor information as the logging stop factor in which the factor for stopping the log information storage of the program execution means 201 is set is set, and the logging information setting storage for storing the stop factor information Means 216, output information monitoring means 206 for judging the coincidence of the stop factor information with the identifier and return value or log information of the function program, and logging for outputting a logging stop command for stopping the log information storage according to the judgment result of the output monitoring means Log information is stored in the control means 207 and the circular storage means and a logging stop command is received. That the logging process unit 205 for stopping the store the log information is provided.

The program execution means 201 is provided with a function program execution means 211 for executing a function program. The logging information setting storage unit 216 includes a logging stop factor information setting unit 203 in which logging stop factor information is set, and a logging stop factor information storage unit 204 that stores the set logging stop factor information. Since the logging stop factor is set by a device other than the control device and functions if the set stop factor information is stored, the logging stop storage unit 203 may be used.
The logging processing unit 205 may be provided with a log information writing unit 210 that stores the log information of the circulation type storage unit 202 in the nonvolatile storage unit 209. Here, the nonvolatile storage unit 209 is a storage unit provided on the nonvolatile storage device 104.

Here, the program is a concept including a function program and a user program. A function program is a program that is called from another program and outputs one return value to the program. The user program is a control program created by a user of the control device using a driver function group and a library function group for the control device.
The log generally refers to recording and recording of computer usage status and data communication. This record includes the date and time when the operation or data was transmitted / received, the contents of the operation performed, the contents of the transmitted / received data, and the like. The log information is information that enables the computer to read the log. In the first embodiment, the contents of the log information are records of the usage status and control status of the control device. Also, logging is recording log information.

  In FIG. 1, the program execution unit 201 outputs log information, and the logging processing unit 205 that has received the log information stores the log information in the circular storage unit 202. The output information monitoring unit 206 includes the stop factor information set and stored by the logging information setting storage unit 216, the stop factor information from the program execution unit 201, the identifier and return value of the function program, or log information (output information). If they match, and if they match, information on the determination result is sent to the logging control means 207. When receiving this information, the logging control unit 207 outputs a logging stop command to the logging processing unit 205. When receiving the logging stop command, the logging processing unit 205 stops storing new log information in the circular storage unit 202. According to this configuration, since the stop factor information stored in the logging information setting storage unit 216 is the stop factor information desired by the user, the storage process in the circular storage unit 202 is performed according to the stop factor desired by the user. Stopped.

FIG. 2 is a hardware configuration diagram of the control device according to the first embodiment. The control device according to the first embodiment is, for example, a programmable logic controller, a controller for various devices, and the like, and is a control device having a function of executing a user-created program.
An input unit 106 for inputting information from an input device such as a keyboard, numeric keys, cursor keys, mouse, joystick, etc., a storage unit 102 for storing information, a central processing unit 101 for performing arithmetic processing based on this information, and this arithmetic An output unit 107 that outputs a processing result as display information such as characters and images to a liquid crystal display, an output device such as a CRT, and various control target devices, and a circulation that stores log information when the central processing unit 101 executes a program Type storage device (ring buffer) 105. The nonvolatile storage device 104 may be configured to store an output at the time of program execution.

A central processing unit 101 that performs arithmetic operations executed by the control device is tightly coupled with a main memory 102 that temporarily stores programs and data (including arithmetic results) used in the central processing unit 101. Yes. The program and data stored in the main storage device 102 are read from the non-volatile storage device 104, and a part of the operation result data stored in the main storage device 102 is stored in the non-volatile storage device 104. The
The data corresponding to the log information among the calculation result data stored in the main storage device 102 is stored in the circulation type storage device 105 that stores the storage area at high speed. The circulation type storage device 105 is a so-called ring buffer that circulates and uses a storage area. The program and data stored in the nonvolatile storage device 104 are input by the input device 106 and output to the outside by the output device 107.

  In addition, the nonvolatile storage device 104 and the circular storage device 105 can be configured as SRAM (Static Random Access Memory). The SRAM does not require an operation for storing and can operate at high speed. Since the circular storage device 105 circulates and uses the storage area of the SRAM, the detection of the overflow of the storage area performed by a normal storage device and the subsequent swap processing are not performed, so that the storage operation can be performed at higher speed.

  The circulation type storage means 202 shown in FIG. 1 of the first embodiment is executed by the circulation type storage device 105 of FIG. The logging stop factor information storage unit 204 and the non-volatile storage unit 209 are realized by the non-volatile storage device 104. In addition, the program execution unit 201, the function program execution unit 211, the logging stop factor information setting unit 203, the output information monitoring unit 206, the logging processing unit 205, and the logging control unit 207 are connected to the central processing unit using the main storage unit 102. 101, and a part of the processing of the program execution unit 201 is output to the output unit. The logging stop factor information setting unit 203 sets the stop factor information according to information input from the input unit 106.

Each means will be described below.
The program execution unit 201 executes a program including a function program, and outputs the return value of the function output from the function program execution unit 211 of the program execution unit 201 and the identifier of the function to the output information monitoring unit 206. In addition, log information output by the function program execution unit 211 is output to the logging processing unit 205.

  The circulation type storage unit 202 stores the log information output by the logging processing unit 205 using the storage area in a circulating manner. Further, the stored information is output in accordance with an instruction from other means. Further, by constructing the circular storage device 105 on the SRAM, it is possible to prevent the loss of log information due to a sudden power shutdown.

  The logging information setting storage unit includes a logging stop factor information setting unit 203 and a logging stop factor information storage unit 204. In the logging stop factor information setting unit 203, stop factor information is input using the input device 106. The stop factor information includes an identifier and a return value or log information of a function program that becomes a stop factor. The logging stop factor information storage unit 204 stores the stop factor information and outputs the stop factor information to the output information monitoring unit 206.

  The output information monitoring unit 206 determines whether the stop factor information matches the identifier of the function program, the return value, or the log information, and outputs the determination result to the logging control unit 207. By outputting the result to the logging control means 207 only when it is determined that they match, the subsequent processing of the central processing unit 101 can be reduced.

  When the determination result of the output information monitoring unit 206 indicates that the stop factor information matches the output value of the function program, the logging control unit 207 sends a logging stop command to stop the log information storage to the logging processing unit 205. Output.

  The logging processing unit 205 receives the log information output from the program execution unit 201 and stores the log information in the circular storage unit 202. Further, when the logging processing unit 205 receives a logging stop command from the logging control unit 207, the logging processing unit 205 stops storing log information. The logging processing unit 205 can be provided with the following log information writing unit 210.

  The log information writing unit 210 is positioned in the logging processing unit 205 and converts the log information ID and the binary log content information stored in the circular storage unit 202 into a character string and stores it in a nonvolatile manner as a log file. Store in device 104.

  FIG. 3 is a detailed block diagram of the program execution unit 201 of FIG. 1 and a diagram for explaining the relationship with other units. The program execution means 201 is detailed to a user program execution means 223, a hook function program execution means 222, and a driver function program execution means 221.

  Here, the user program execution means 223 is a means for executing a user program. The driver function program is a function program that is called from a user program or a hook function program and performs processing unique to the control device and processing that is commonly performed by the control device program. The driver function program execution means 221 is a means for executing this driver function. A hook function program is a function program that is called from a user program, outputs log information, calls a driver function program, and outputs a return value, and is a program that detects the occurrence of an error in a normal program and issues a warning. The hook function program execution means 222 is a means for executing this hook function program. The hook function program is usually created by the user.

  When the user program execution means 223 executes the processing of one hook function program of the hook function program execution means 222, the processing of one driver function of the driver function program execution means 221 called in the processing of the hook function program is executed. Then, the information given at the time of executing the processing of the driver function program and the value of the execution result (return value of the function program) are output to the output information monitoring means 206 as information. Further, the hook function program execution unit 222 may be configured to output the return value of the hook function program to the output information monitoring unit 206.

  Information on the result of execution and return value of the driver function program execution means 221 is output to the user program execution means 223 that called the driver function program or the hook function program execution means 222.

    FIG. 4 is a flowchart showing a processing flow of the function information determination unit 215 including the output information monitoring unit 206, the logging control unit 207, and the logging processing unit 205. The function information determination unit 215 performs the processing of the flowchart shown in FIG. 4 and stores the log information in the circulation type storage unit 202 as fixed-length data.

  Here, the log information is composed of an ID indicating the type of log and log content information indicating the content of the log. By making log information into 32-bit ID and log content information of 32-bit binary data and making it a fixed length data, the amount of log information stored in the circular storage device 105 is reduced. 223, the hook function program execution means 222, and the driver function program execution means 221 can suppress a decrease in speed due to taking log information.

  Step 10 in FIG. 4 determines whether the logging stop flag indicating whether or not to record log information is ON or OFF. If it is OFF, the process proceeds to Step 11, and if it is ON, the process of the function information determination unit 215 is performed. finish.

In step 11, whether the value of the result of processing in the driver function program execution unit 221 (function return value) matches any one of the plurality of logging stop factor information stored in the logging stop factor information storage unit 204. The process proceeds to step 14 if they match, and to step 12 if they do not match. The determination is made when the stop factor information is an identifier and a return value of the function program, and the identifier and the return value are stopped when the function program of the driver function program execution means 221 is the same as the identifier and the return value of the function. Judged to match the cause information.
In step 14, the logging stop flag is turned ON and the process proceeds to step 13.

Step 12 determines whether or not the recirculation type storage means 202 has caused an overrun. If the overrun has occurred, the process proceeds to step 15, and if no overrun has occurred, the process proceeds to step 13. Here, overrun refers to the storage means that circulates and uses the storage area. As a result of the increase in the storage information and circulation, new information is overwritten and stored in an effective storage area that has been stored and not transferred anywhere. That means.
In step 15, the overrun flag stored in the circulation type storage unit 202 is turned on, and the process proceeds to step 13.

  In step 13, the 32-bit ID and the content information of the 32-bit binary data are stored as log information in the circular storage means 202, and the process of the function information determination unit 215 is terminated.

  FIG. 5 is a flowchart showing a processing flow of the log information writing unit 210. Step 16 in FIG. 5 determines whether or not the logging stop flag is ON. If the logging stop flag is OFF, the process proceeds to step 17, and if it is ON, the process proceeds to step 20.

Step 17 determines whether or not the overrun flag stored in the circulation type storage means 202 is ON. If the overrun flag is ON, the process proceeds to step 21. If the overrun flag is OFF, step 18 is executed. Proceed to
In step 21, an overrun error indicating an overrun state is written as a log file in the nonvolatile storage means 209, and the process proceeds to step 22.
Step 18 stores a predetermined amount of 32-bit ID stored in the circular storage unit 202 and information obtained by converting 32-bit binary data into a character string in the nonvolatile storage unit 209 as a log file. Proceed to 19.
Steps 17 and 21 can also be realized by sending an overrun signal to the logging control means 207 and the logging control means 207 sending a logging stop command to the logging processing means 205.

  In step 19, the execution of the storage monitoring unit 207 is stopped (waited) until the wait time set in the logging stop factor information storage unit 204 to stop the execution of the storage monitoring unit 207, and the process proceeds to step 16. The greater the number of times the driver function program execution means 221 is executed during the execution of the user program, the higher the possibility that log information will be generated and an overrun of the circular storage means 202 will occur. The waiting time of the logging stop factor information storage unit 204 is adjusted and set to an optimum value.

  According to the first embodiment, by stopping logging with the logging stop factor information set by the user, it is possible to prevent overwriting of log information in the circular storage device required by the user. Can reliably acquire necessary log information.

  Further, according to the first embodiment, in the device that writes log information in a circulating manner to the storage area, the logging function is stopped by the logging stop factor set by the user, so that the circulating storage means 202 required by the user is obtained. You can prevent overwriting the log information inside. In addition, a decrease in processing speed due to logging can be suppressed with respect to the control processing.

  According to the first embodiment, since the execution of the storage monitoring unit 207 is stopped until the wait time set in the logging stop factor information storage unit 204, a decrease in processing speed due to the execution of the storage monitoring unit 207 can be suppressed. .

Embodiment 2. FIG.
The control apparatus according to the first embodiment sets the wait time for stopping writing to the log file as the time set by the user. In the second embodiment, a log information determination unit 231 is added, a wait time is set from the rate of increase of the log information storage amount of the circular storage means 202, and the processing speed by writing the log file according to the status of the control device It is characterized by further suppressing the decrease in the above.

  FIG. 6 is a block diagram illustrating a control device according to the second embodiment. In FIG. 6, the program execution means 201, the circulation type storage means 202, the output information monitoring means 206, the logging control means 207, the logging processing means 205, and the logging stop factor information storage means 204 are the same as those in the first embodiment. Therefore, the different log information determination unit 231 will be described. The log information determination unit 231 monitors the state of the circulation type storage unit 202, measures the timing for writing the log information, and causes the log information writing unit 210 to write the log information.

The log information determination unit 231 calculates the usage rate of the circulation type storage unit 202 and determines whether or not the usage rate is equal to or higher than a predetermined usage rate (threshold value) determined for each control device.
When the usage rate of the circulation type storage unit 202 is equal to or higher than the predetermined usage rate, the log information writing unit 210 stores the 32-bit ID stored in the circulation type storage unit 202 and the log content information of 32-bit binary data. The converted character string is stored in the nonvolatile storage means 209 as a log file.
In addition, the log information determination unit 231 calculates a wait time when the usage rate of the circulation type storage unit 202 is equal to or greater than a threshold from the increase rate of the log information stored in the circulation type storage unit 202, and the storage monitoring unit only for this wait time. The execution of at least one of 207 and log information writing means 210 is stopped (waited).

  The priority of the log information determination unit 231 and the log information writing unit 210 on the OS is set higher than the priority of the user program execution unit 223. With this priority setting, the log information determination unit 231 that determines the usage rate of the log information stored in the circular storage unit 202 and the log information writing unit 210 that writes the log information to the log file are processed with priority. Therefore, the log information is excessively accumulated in the circulation type storage unit 202, and the probability that the circulation type storage unit 202 causes an overrun is reduced.

  More specifically, the log information determination unit 231 includes a usage rate calculation unit 232 and a storage area monitoring unit 233 described below.

When the circulation type storage unit 202 is not used in a circulating manner, the usage rate calculation unit 232 obtains a ratio of information storage with respect to the total storage amount of the circulation type storage unit 202 as a non-circulation usage rate. The storage area monitoring unit 233 outputs a write signal for all log information when the non-circular usage rate exceeds a predetermined usage rate. Here, the predetermined usage rate is a value that is input from the input device 106 and stored in the nonvolatile storage means 209 or the main storage device 102. The write signal for all log information is a signal representing an instruction for instructing to write all log information stored in the circulation type storage unit 202 to the nonvolatile storage unit 209.
When the logging control unit 207 receives a write signal for all log information, the logging control unit 207 sends a command for writing all log information to the logging processing unit 205, and the logging processing unit 205 that has received this command stores the log information writing unit 210 in a non-volatile storage unit. All log information is written to 209.

  When the circulation type storage unit 202 is used cyclically, the usage rate calculation unit 232 outputs the ratio stored in the circulation type storage unit 202 after the logging stop command for the total storage amount of the circulation type storage unit 202 is output. Calculate as usage rate. The storage area monitoring unit 233 outputs a write signal for all log information to the logging control unit 207 when the usage rate during circulation exceeds a predetermined usage rate. When the logging control unit 207 receives the write signal for all log information, the logging control unit 207 sends a command for writing all log information to the logging processing unit 205, and the logging processing unit 205 sends the log information writing unit 210 to the non-volatile storage unit 209. To write.

  FIG. 7 is a flowchart of processing performed by the log information determination unit 231 and the log information writing unit 210. In step 24, the priority of processing in the control apparatus regarding the log information determination unit 231 and the log information writing unit 210 is set higher than the priority of the user program execution unit 223. The priority of the log information determination unit 231 and the log information writing unit 210 may be set higher than that of the program execution unit 201.

  Step 16 determines whether or not the logging stop flag stored in the main storage device 102 and indicating whether or not the log information needs to be stored is ON. If the flag is OFF, the process proceeds to Step 17 and is ON. If yes, go to Step 20. Note that the initial value of the logging stop flag is normally ON.

  Step 17 determines whether or not the overrun flag stored in the main storage device 102 and indicating whether or not the circulation type storage means 202 is overrun is ON. If the overrun flag is ON, the process proceeds to step 21; When the overrun flag is OFF, the process proceeds to step 25. Note that the initial value of the overrun flag is normally OFF.

  Step 25 determines whether or not the usage rate of the circulation type storage means 202 is equal to or higher than a predetermined usage rate (threshold). If the usage rate is equal to or higher than the predetermined usage rate (threshold), the process proceeds to Step 18; If the usage rate is less than the predetermined usage rate (threshold), the process proceeds to step 26. After the usage rate of the circulation type storage unit 202 becomes equal to or higher than a predetermined usage rate (threshold), the log information is written to the log file stored in the nonvolatile storage unit 209, thereby reducing the number of times the log file is written, The program processor 201 and the function information determination unit 215 can suppress a decrease in speed due to the log file writing process.

  In step 18, the 32-bit ID stored in the circular storage unit 202 and the character string obtained by converting the content information of the 32-bit binary data into a character string are written in the log file, and the process proceeds to step 26.

  In step 26, the increase rate of the log information stored in the circulation type storage unit 202 is calculated, and the process proceeds to step 27. Here, the log information increase rate is a value obtained by dividing the increased log information amount (number of bits) by unit time.

  Step 27 calculates the wait time when the usage rate of the cyclic storage device 105 is equal to or greater than a predetermined usage rate (threshold) from the increase rate of the log information stored in the cyclic storage unit 202 calculated in Step 26. After waiting for this wait time, the process proceeds to step 24. Here, the wait time is calculated by (total storage capacity of the circulation type storage device × predetermined usage rate (threshold) / increase rate).

  By adjusting the wait time to an appropriate value, useless writing processing of the log information writing unit 210 can be eliminated. By adjusting the wait time, it is possible to suppress a decrease in speed due to a high frequency of write processing for the program execution unit 201 and the function information determination unit 215.

In step 20, it is determined whether or not the circulation type storage unit 202 is used. If it is used, the process proceeds to step 22, and if it is not used, the process proceeds to step 26.
In step 21, an overrun error indicating that the circular storage device 105 is in an overrun state is stored in the log file, and then the process proceeds to step 22.

  Step 22 converts all the log information composed of the 32-bit ID and the content information of the 32-bit binary data stored in the circular storage means 202 into a character string, and stores the conversion result in a log file. Proceeding to step 26, the increase rate of the log information in the circular storage device 105 is calculated, and the processing of the log information determination unit 231 and the log information writing unit 210 is waited until the usage rate becomes equal to or higher than the predetermined usage rate.

  According to the second embodiment, the wait time is set based on the increase rate of the log information storage amount of the circulation type storage unit 202, and writing of log information is stopped until this wait time, so that the state of the control device is met. Since the time to stop writing log information can be adjusted, it is possible to further suppress the decrease in processing speed due to writing to the log file.

It is a block diagram of the control apparatus by Embodiment 1 of this invention. It is a hardware block diagram of the control apparatus by Embodiment 1 of this invention. It is a detailed block diagram of the program execution means by Embodiment 1 of this invention. It is a flowchart of the output information monitoring means, logging control means, and logging processing means by Embodiment 1 of this invention. It is a flowchart of the log information writing means by Embodiment 1 of this invention. It is a block diagram of the control apparatus by Embodiment 2 of this invention. It is a flowchart of the utilization rate calculation means by the Embodiment 2 of this invention, a storage area monitoring means, and log information writing means.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 101 Central processing unit, 102 Main memory unit, 104 Non-volatile memory device, 105 Circulation type memory device, 106 Input device, 107 Output device, 201 Program execution means, 202 Circulation type memory means, 203 Logging stop factor information setting means, 204 Logging stop factor information storage means, 205 Logging processing means, 206 Output information monitoring means, 207 Logging control means, 209 Non-volatile storage means, 210 Log information writing means, 211 Function program execution means, 215 Function information determination section, 216 Logging Stop factor setting storage means, 221 driver function program execution means, 222 hook function program execution means, 223 user program execution means, 231 log information determination unit, 232 usage rate calculation means, 233 storage area monitoring means.

Claims (8)

Program execution means for executing a program including a function program;
A circulation type storage means for storing information by cyclically using a storage area;
Logging information setting storage means for storing stop factor information in which a factor for stopping storage of log information of the program execution means is set;
Output information monitoring means for determining whether the stop factor information matches the identifier and return value of the function program or the log information;
Logging control means for outputting a logging stop command for stopping storage of the log information according to a judgment result of the output information monitoring means;
And a log processing means for storing the log information in the circular storage means and stopping storing the log information upon receipt of the logging stop command. 2. The control apparatus according to claim 1, wherein the stop factor information is information output to log information or an identifier and return value of a function program. The logging processing means comprises log information writing means for stopping the storage in the circular storage means upon receiving the logging stop command and storing the log information stored in the circular storage means in the nonvolatile memory. The control device according to claim 1, wherein When the circulation type storage means is not used cyclically, a usage rate calculation means for obtaining a ratio of storing the effective information of the circulation type storage means with respect to the total storage amount as a non-circulation usage rate,
And storage area monitoring means for outputting a write signal of all log information when the non-circular usage rate exceeds a predetermined usage rate,
2. The control device according to claim 1, wherein the logging control unit sends a command for writing all log information to the logging processing unit when receiving the write signal for all log information. The logging control means stops at least one of the storage monitoring means and the log information writing means until the time until the predetermined usage rate obtained from the increase rate per unit time of the non-circulating usage rate has elapsed. The control device according to claim 4, wherein When the circulation type storage means is used cyclically, the usage rate calculation means for obtaining the ratio stored in the circulation type storage means after the logging stop command for the total storage amount is output as the usage rate during circulation,
And a storage area monitoring means for outputting a write signal for all log information when the circulating usage rate exceeds a predetermined usage rate,
2. The control device according to claim 1, wherein the logging control unit sends a command for writing all log information to the logging processing unit when receiving the write signal for all log information. The logging control means stops at least one of the storage monitoring means and the log information writing means until the time until the predetermined usage rate obtained from the increase rate per unit time of the circulation usage rate has elapsed. The control device according to claim 6. Program execution means for executing a program including a function program;
A circulation type storage means for storing information by cyclically using a storage area;
Logging information setting storage means for storing stop factor information in which a factor for stopping storage of log information of the program execution means is set,
Output information monitoring means for determining whether the stop factor information matches the identifier and return value of the function program or the log information;
Logging control means for outputting a logging stop command for stopping storage of the log information according to a judgment result of the output information monitoring means;
And a program for a control device for causing the control device to function as a logging processing unit for storing the log information in the circular storage unit and stopping the storage of the log information when the logging stop command is received.

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