KR20190082993A - Control unit and temperature determination method - Google Patents

Abstract

The CPU unit 10 determines a first operating condition that is a use condition of the user and determines whether or not a function exceeding the specification upper limit value and a function exceeding the specification upper limit value And a result output section for presenting the determination result as a result of the determination by the temperature analysis section to the display device.

Description

Control unit and temperature determination method

The present invention relates to a control unit and a temperature determining method for determining whether or not a component temperature when a process is executed is an appropriate temperature

A programmable logic controller (PLC) is a device that controls a controlled device. These PLCs are constituted by using a plurality of parts, and an upper limit permissible temperature of the parts is set in order to prevent malfunction or failure due to temperature rise of the parts. For this reason, the PLC needs to be designed so that it does not exceed the maximum allowable temperature of each part. For example, to reduce the temperature of each part so that all parts do not exceed the upper limit allowable temperature at the maximum ambient temperature to be used, Or the like. Each specification value of this function is determined on the assumption that all the functions are used at the same time. However, there is a desire to use the PLC in an environment with a low ambient temperature or to use the function exceeding the upper limit of the design guarantee specification for a function to be used from a user who does not use a specific function. The temperature determination is described in Patent Document 1 below.

The programmable controller described in Patent Document 1 calculates the average simultaneous warming rate (on rate) of the input / output circuit and uses the average simultaneous warming rate to grasp the internal temperature of the programmable controller.

Patent Document 1: JP-A-2013-205878

However, in the conventional technique described above, the temperature determination is performed only at the average simultaneous warm-up rate of the input / output circuit. Therefore, when the user wants to use the device beyond the design guarantee value with a function other than the average simultaneous warming rate, Judgment could not be made.

The present invention has been made in view of the above, and an object thereof is to obtain a control unit which can accurately determine whether a component temperature corresponding to an operating condition for realizing a function desired by a user is an appropriate temperature.

In order to solve the above-described problems and to achieve the object, the present invention provides a control unit that determines a first operating condition that is a use condition of a user and, when the first operating condition includes a function exceeding the upper limit of the design guarantee specification For judging whether or not the component temperature is acceptable for the combination of the function exceeding the specification upper limit value and the function that does not exceed the specification upper limit value. Further, the control unit of the present invention is provided with a result presentation unit for presenting the determination result that is the result of determination to the display device.

The control unit according to the present invention achieves the effect that it is possible to accurately determine whether the component temperature corresponding to the operating condition is an appropriate temperature.

1 is a diagram showing a configuration of a PLC according to an embodiment of the present invention.
2 is a diagram showing a configuration of a CPU (Central Processing Unit) unit according to the embodiment.
3 is a flowchart showing an operation procedure of the CPU unit according to the embodiment.
4 is a diagram showing a configuration example of a correspondence relationship table according to the embodiment.
5 is a diagram showing an example of an operation condition according to the embodiment.
6 is a diagram showing an example of a setting screen for setting an operating condition according to the embodiment.
7 is a diagram for explaining access frequency calculation processing according to the embodiment.
8 is a diagram showing a hardware configuration example of the CPU unit according to the embodiment.

Hereinafter, the control unit and the temperature determination method according to the embodiment of the present invention will be described in detail with reference to the drawings. Incidentally, the present invention is not limited to this embodiment.

Embodiment

1 is a diagram showing a configuration of a PLC according to an embodiment of the present invention. The PLC 1 is a device that controls a not-shown controlled device on the basis of a sequence program. The PLC 1 has a CPU unit 10 as a control unit, and the CPU unit 10 has a plurality of components 25. The temperature of each component 25 changes when the CPU unit 10 executes various processes. The CPU unit 10 of the embodiment determines whether or not the temperature of the component 25 when the CPU unit 10 executes various processes is a proper temperature.

Examples of components 25 are application specific integrated circuits (ASICs), memories, batteries, output relays, or capacitors. The examples of the memory of the component 25 are a work memory, a nonvolatile memory and a volatile memory, which will be described later.

The temperature sensor 20, which is a temperature measuring unit, measures the ambient temperature at which the component 25 disposed in the CPU unit 10 is used. The use ambient temperature of the component 25 is the ambient temperature of the component 25 when the CPU unit 10 is operating. Here, the temperature measured by the temperature sensor 20 is the ambient temperature at which the component 25 is used. In addition, the use ambient temperature of the component 25 may be input by the user. In other words, the use ambient temperature of the component 25 may be an actual measurement value or may be set by a user. In the following description, the use ambient temperature of the component 25 is referred to as ambient temperature TA. In the PLC 1, when the ambient temperature TA is high, the component temperature to be described later also becomes high. Therefore, it is necessary to acquire the ambient temperature TA by the temperature sensor 20 or to input the ambient temperature TA by the user.

The PLC 1 is connected to an alarm output device 3 for outputting an alarm. In addition, the alarm output device 3 may be disposed in the PLC 1. [ The CPU unit 10 of the embodiment outputs an alarm to the alarm output device 3 when the temperature of the component 25 is inappropriate.

The PLC 1 is connected to a display device 2 such as a programmable display device. The CPU unit 10 may display the determination result of the temperature of the component 25 on the display device 2. [ In addition, the CPU unit 10 may display an example of an operation condition change corresponding to the determination result on the display device 2. [ The operation condition change example is information for urging the user to change the operation condition when the CPU unit 10 operates. The CPU unit 10 presents to the user an example of an operation condition change in which the component temperature, which is the temperature of the component 25, falls within an appropriate temperature range. The CPU unit 10 causes the display device 2 to display an operation condition change example for lowering the component temperature or an operation condition change example for improving the operation performance of the CPU unit 10. [

The PLC 1 includes various units such as an input / output unit 51, a power source unit 52, and an analog unit 53. [ The CPU unit 10, the input / output unit 51, the power supply unit 52, and the analog unit 53 are connected to a bus (not shown).

The CPU unit 10 controls the controlled device connected to the PLC 1. An example of the controlled device is a sensor or a robot. The CPU unit 10 determines whether or not the component temperature is acceptable based on the operation conditions of the CPU unit 10. [ The operating conditions of the CPU unit 10 include an operating environment in which the CPU unit 10 operates, computing performance set in the CPU unit 10, and usage functions used by the CPU unit 10. [

The CPU unit 10 analyzes the component temperature of the component 25 disposed in the CPU unit 10. [ Specifically, the CPU unit 10 determines that the component temperature is not acceptable when the component temperature exceeds the upper limit allowable temperature, and determines that the component is acceptable when the component temperature is not higher than the upper limit allowable temperature. The upper permissible temperature is the upper limit of the component temperature allowed for the component 25. The CPU unit 10 outputs an alarm to an external device such as the alarm output device 3 when the component temperature exceeds the upper limit allowable temperature. The CPU unit 10 outputs the determination result of acceptance, which is the analysis result of the component temperature, to the outside such as the display device 2.

The input / output unit 51 is a unit for executing input and output of signals. The input / output unit 51 has an input circuit for acquiring an input signal from the outside and an output circuit for generating an output signal for operating the controlled device.

The power supply unit 52 is a unit for supplying power to the CPU unit 10, the input / output unit 51 and the analog unit 53. [ The analog unit 53 is an interface for converting an analog signal from the outside into a digital value and receiving it into the PLC 1. [

In addition, the temperature sensor 20 may be disposed outside the CPU unit 10. The component 25 may be disposed outside the CPU unit 10. The component 25 may be an external memory mounted on the CPU unit 10. [

2 is a diagram showing a configuration of a CPU unit according to the embodiment. The CPU unit 10 is provided with an ambient temperature reception section 11A for receiving the ambient temperature TA which is the ambient temperature detected by the temperature sensor 20 and an ambient temperature reception section 11B for receiving the ambient temperature TA inputted from the user . Incidentally, the CPU unit 10 may include both of the ambient temperature receiving portions 11A and 11B, or may include only one of them.

The CPU unit 10 includes a control program storage unit 14 for storing a control program used by the CPU unit 10 for controlling the controlled device and a use function memory for storing a use function used by the CPU unit 10. [ (13). The CPU unit 10 is provided with a correspondence relationship database (Database) 15 for storing the correspondence relationship between the operation conditions when the CPU unit 10 executes the process and the acceptability determination result of the component temperature.

The CPU unit 10 further includes a temperature analyzing unit 12 for analyzing and determining whether or not the component temperature at the time of operation of the CPU unit 10 is acceptable based on the ambient temperature TA, the control program, the use function, . The CPU unit 10 also has a result output unit 16 for outputting information corresponding to the determination result by the temperature analysis unit 12 to the outside.

The CPU unit 10 includes a control unit 17 for controlling the controlled device by using a control program and an instruction output unit 18 for outputting the control instruction generated by the control unit 17 to the controlled device . The CPU unit 10 is provided with a function setting section 19 for setting a used function to a tool such as a logging setting tool in accordance with an instruction input from a user.

The temperature analyzing section 12 includes ambient temperature receiving sections 11A and 11B, a use function storage section 13, a control program storage section 14, a correspondence relationship DB 15, a result output section 16, Respectively. The control unit 17 is connected to the instruction output unit 18, the function setting unit 19, and the control program storage unit 14. The function setting unit 19 is connected to the use function storage unit 13. The result output unit 16 is connected to the display device 2 and the alarm output device 3. [

The ambient temperature receiving section 11A is connected to the temperature sensor 20 and receives the ambient temperature TA detected by the temperature sensor 20 and sends it to the temperature analyzing section 12. [ The ambient temperature receiving unit 11B is connected to an input device such as a touch panel, a mouse, or a keyboard, receives the ambient temperature TA inputted by the user, and sends the received ambient temperature TA to the temperature analyzing unit 12. [ In addition, the display device 2 may be provided with the touch panel.

The control program stored in the control program storage unit 14 may be a sequence program such as a ladder program or other program. The use function stored in the use function storage unit 13 is a function such as data logging or Ethernet (registered trademark) communication. The function setting unit 19 sets the use function through the tool designated by the user and stores the information indicating the contents of the set function in the use function storage unit 13. [ An example of a tool used when a use function is set by a user is a logging setting tool or an Ethernet communication setting tool.

The correspondence relationship stored in the correspondence relationship DB 15 which is the correspondence relation storage section is a correspondence relationship table 101 in which a candidate of a plurality of operation conditions used by the CPU unit 10 is associated with a result of determining whether or not the component temperature is acceptable, to be. In the corresponding relationship table 101 as the correspondence relationship information, the acceptability judgment of "failure" is registered in the combination of the operation conditions when the component temperature is higher than the upper limit allowable temperature, and the operation condition The acceptability judgment of " acceptance " is registered. Examples of the operating conditions registered in the correspondence relationship table 101 are an operating environment in which the CPU unit 10 operates, a computing performance set in the CPU unit 10, and a use function used by the CPU unit 10. [ The correspondence relationship DB 15 stores the correspondence relationship table 101 for each part 25. [

The judgment judging unit 12 includes a control program stored in the control program storage unit 14, a correspondence relationship table 101 stored by the correspondence DB 15, The use function is analyzed, and based on the analysis result, it is determined whether or not the component temperature is acceptable. The temperature analyzing unit 12 sends an instruction corresponding to the determination of acceptability of the component temperature to the result output unit 16, which is a result presentation unit. The temperature analyzing unit 12 sends an output instruction of the alarm to the result output unit 16 when the component temperature is not acceptable.

The temperature analyzing unit 12 may display the operation condition change example, which is an example of the changeable operating condition, on the display device 2 through the result output unit 16. [ In this case, the temperature analyzing unit 12 extracts any combination among the combinations of the operating conditions corresponding to each other in the corresponding relationship table 101, and displays it on the display device 2 through the result output unit 16, To the result output unit 16. The change output unit 16 outputs the changed operation condition change example to the output unit 16. [

When the temperature of the component 25 is higher than the upper limit allowable temperature, the temperature analysis unit 12 causes the display device 2 to display an operation condition change example for lowering the component temperature through the result output unit 16. [ When the component temperature is equal to or lower than the upper limit permissible temperature, the temperature analysis section 12 displays an example of the operation condition change for improving the operation performance of the CPU unit 10 on the display device 2 through the result output section 16 . In addition, when an operation condition that the user does not want to change is designated by the user, the temperature analyzing unit 12 outputs the operation condition changing example in which the operation condition other than the operation condition designated by the user is changed to the result output unit 16 Or may be displayed on the display device 2 through the display device.

The result output unit 16 may display an alarm on the display device 2 or display an example of changing the operating condition, or may output an alarm to the alarm output device 3. A display instruction of an alarm sent to the display device 2 by the result output unit 16 or a display instruction of an operation condition change example sent to the display device 2 or an output instruction of an alarm sent to the alarm output device 3, (10). In this manner, the result output unit 16 presents the determination result of acceptance to the outside such as the display device 2 or the alarm output device 3. [

The alarm output device 3 is a sound output device or an optical output device. When the alarm output device 3 is an audio output device, the alarm output device 3 outputs an alarm sound. When the alarm output device 3 is an optical output device, And outputs light. An example of the optical output device is an LED (Light Emitting Diode).

In addition, the temperature analyzing unit 12 may calculate the component temperature using the formula for calculating the component temperature and the operating condition. When the component temperature is calculated using the formula, the temperature analyzing unit 12 determines whether the component temperature is acceptable or not by comparing the calculated component temperature and the upper limit allowable temperature. The alarm output device 3 sends the temperature calculation result, which is the component temperature calculated using the formula, to the display device 2. In addition, at least one of the display device 2 and the alarm output device 3 may be disposed in the CPU unit 10. [

3 is a flowchart showing an operation procedure of the CPU unit according to the embodiment. Incidentally, the timing at which the CPU unit 10 performs the temperature determination as to whether the component temperature is an appropriate temperature or an improper temperature may be at any timing. That is, the CPU unit 10 may perform the temperature determination before starting the control of the controlled device, or may determine the temperature during the control of the controlled device.

The control program storage unit 14 stores a control program in advance. The correspondence relationship DB 15 stores the correspondence relationship table 101 in advance. The function setting unit 19 accepts setting of a use function to various setting tools by the user. Then, in step S10, the function setting unit 19 sets the use function by registering the received use function in the use function storage unit 13. [

In step S20, the ambient temperature reception unit 11A or the ambient temperature reception unit 11B inputs the ambient temperature TA to the temperature analysis unit 12. [ The ambient temperature receiving section 11A receives the ambient temperature TA detected by the temperature sensor 20 and outputs the ambient temperature TA to the temperature analyzing section 12 when the CPU unit 10 is set to use the ambient temperature receiving section 11A, . On the other hand, when the CPU unit 10 is set to use the ambient temperature reception unit 11B, the ambient temperature reception unit 11B receives the ambient temperature TA from the user and inputs the ambient temperature TA to the temperature analysis unit 12. [ Incidentally, either the processing of step S10 or the processing of step S20 may be executed first.

The temperature analysis section 12 reads the control program from the control program storage section 14 and reads the corresponding relationship table 101 from the correspondence relationship DB 15 and reads the use function from the use function storage section 13 I will.

Here, the configuration of the correspondence relationship table 101 will be described. 4 is a diagram showing a configuration example of a correspondence relationship table according to the embodiment. The correspondence relationship table 101 is an information table in which one or a plurality of operating conditions used by the CPU unit 10 to control the controlled device and a result of determining whether or not the component temperature is acceptable are associated with each other. In the correspondence relationship table 101, a plurality of combinations of candidates of the operating conditions used by the CPU unit 10 and the acceptability determination result are registered. In addition, the operation condition indicated by the identifier of No.0 is the upper limit value of each function when all the functions are used. That is, the numerical value of each item of No. 0 is the specification upper limit value of each function. This specification upper limit value is a design guarantee value set by the manufacturer of the CPU unit 10. [ The operating conditions of the CPU unit 10 include an operating environment in which the CPU unit 10 operates, a computing performance set in the CPU unit 10, and a use function used by the CPU unit 10. [ An example of the operating environment in which the CPU unit 10 operates is the ambient temperature TA of the component 25. An example of the calculation performance set in the CPU unit 10 is an operation frequency of the CPU unit 10. [ Examples of usage functions used by the CPU unit 10 are logging, Ethernet communication, or memory access. Incidentally, in the following, one operation condition registered in the correspondence relationship table 101 may be referred to as one item.

In the correspondence relationship table 101 shown in Fig. 4, seven items and a result of determination of acceptability, which is a result of temperature determination, are associated with each other. The operation conditions registered in the correspondence relation table 101 are the ambient temperature TA of the component 25, the operation frequency of the CPU unit 10, the presence or absence of "use of logging", the "logging cycle" , &Quot; memory access instruction number ", or " memory access weight ".

The " logging cycle " indicates a cycle in the logging. The "memory access instruction" indicates the number of times the CPU unit 10 accesses the memory within the program execution time. The "memory access weight" indicates the weight when the CPU unit 10 accesses the memory within the program execution time Time. The operation condition in the correspondence relationship table 101 includes an operation condition of a function whose operation condition exceeds a design guarantee specification upper limit value and an operation condition of a function that does not exceed a specification upper limit value. In addition, the numerical value registered in the correspondence relationship table 101 may be a numerical range.

A combination of combinations of operating conditions when the component temperature is equal to or less than the upper limit permissible temperature and a combination of operation conditions when the component temperature is higher than the upper limit allowable temperature It is registered. The acceptability determination result is set in advance for each combination of operating conditions. More specifically, the computer that determines acceptability determines the component temperature when the CPU unit 10 is operated using a combination of operating conditions. The computer that makes this acceptability determination determines whether or not the component temperature is acceptable by comparing the calculated component temperature and the upper limit allowable temperature. If the calculated component temperature is equal to or lower than the upper limit permissible temperature, the computer that makes the acceptability determination determines that the component is acceptable. If the calculated component temperature is higher than the upper limit permissible temperature, the computer determines that the component fails. Then, the computer that makes the acceptability determination registers the acceptability determination result in the correspondence relationship table 101. [ In addition, the computer that performs the acceptability determination may register the component temperature in the corresponding relationship table 101, and register the upper limit allowable temperature. The computer that performs the acceptability determination computes the component temperature for each component 25, determines whether or not the component is acceptable, and registers the component temperature in the correspondence relationship table 101. In addition, the operating conditions of the CPU unit 10 need not include either of the computation performance set in the CPU unit 10 and the use function used by the CPU unit 10. [

In the correspondence relationship table 101, identification information is associated with one or a plurality of operation conditions and a combination of the acceptability determination results. In Fig. 4, the identification information is indicated by No. 0 to No. 4. [

The temperature analysis section 12 determines the operating conditions used in the CPU unit 10 from the ambient temperature TA, the control program in the control program storage section 14, or the use function in the use function storage section 13. When the user inputs the ambient temperature TA from the ambient temperature reception unit 11B, the temperature analysis unit 12 acquires the ambient temperature TA from the ambient temperature reception unit 11B. When the temperature sensor 20 measures the temperature of the component 25, the temperature analyzing section 12 acquires the ambient temperature TA from the ambient temperature receiving section 11A.

When the user sets the operation frequency from the CPU parameter setting tool described later, the use function storage unit 13 stores the operation frequency. In this case, the temperature analyzing unit 12 extracts the operating frequency from the use function storage unit 13. [ When the logging period is set by the user from the logging setting tool, the use function storage unit 13 stores the logging period. In this case, when the use of the logging is included in the operating condition, the temperature analyzing unit 12 extracts the logging cycle from the use-function storing unit 13. [ When the frequency of the access command is included in the operation condition, the temperature analyzer 12 calculates the frequency of the access command based on the control program, thereby extracting the frequency of the access command from the control program. The frequency of the access instruction is the frequency with which the CPU unit 10 accesses the memory at the program execution time. More specifically, the frequency of the access command is the number of times per unit time that the CPU unit 10 accesses the memory while the CPU unit 10 executes the control program.

The temperature analyzing unit 12 determines the operation conditions used in the CPU unit 10 from the control program storage unit 14 or the use function storage unit 13 and outputs the set of the determined operation conditions to the corresponding relationship table 101. [ Lt; / RTI > Then, in step S30, the temperature analyzing unit 12 analyzes the component temperature using the corresponding relationship table 101 to determine the component temperature. Then, in step S40, the temperature analyzing unit 12 determines whether the component temperature is over the temperature. The operation condition in the correspondence relationship table 101 includes an operation condition of a function whose operation condition exceeds a design guarantee specification upper limit value and an operation condition of a function that does not exceed a specification upper limit value. Therefore, the temperature analyzing unit 12 determines whether or not the component temperature is over the temperature for the combination of the function for which the operating condition exceeds the upper limit of the design guarantee specification and the function for which the operation upper limit is not exceeded.

Specifically, the temperature analyzing section 12 extracts a part of the operating condition based on the control program in the control program storing section 14, extracts a part of the operating condition from the using function of the using function storing section 13 , The ambient temperature TA is acquired from the ambient temperature receiving portion 11A or the ambient temperature receiving portion 11B. Thereby, the temperature analyzing unit 12 acquires a combination of operating conditions when the CPU unit 10 controls the controlled device. Then, the temperature analyzing unit 12 selects a combination of the obtained operating conditions from among the corresponding relationship tables 101. Further, the temperature analyzing unit 12 reads the acceptability determination result corresponding to the combination of the selected operating condition from the correspondence relationship table 101. [

In addition, the temperature analyzing section 12 may acquire a combination of operating conditions without using the use function storing section 13, or may obtain a combination of operating conditions without using the control program storing section 14. [ In other words, the combination of the operating conditions does not need to include the used function, and the combination of the operating conditions does not need to include the computing performance. The combination of the operating conditions does not need to include the ambient temperature TA.

Here, the temperature analyzing section 12 determines the set of the operating conditions based on the use function in the use function storage section 13 and the control program in the control program storage section 14, The case where the set is determined will be described. The operating condition of No. 1 is the case where the operating frequency exceeds 80 MHz of No. 0 which is the specification upper limit value, but the logging period does not require 3 ns of No.0 which is the specification upper limit value. In this case, the temperature analyzing unit 12 obtains the ambient temperature TA representing 50 degrees, the operation frequency indicating 200 MHz, the information indicating that the logging function is used, the logging cycle indicating 5 ns, and the Ethernet communication being used The number of memory access instructions indicating the number of 100's, and the memory access weight indicating 0 ns. When the temperature analyzing section 12 extracts a set of operation conditions indicated by the identifier of No. 1, the acceptance determination result corresponding to this set is rejection in the correspondence relationship table 101. [ That is, the component temperature in this case is over temperature as compared with the upper limit allowable temperature.

When the temperature of the component exceeds the temperature, the temperature analyzing unit 12 sends an output instruction to the result output unit 16 to output an alarm. As a result, the result output section 16 causes the display device 2 to display that the temperature of the component exceeds the temperature, or to output an alarm to the alarm output device 3. [ This makes it possible to prevent malfunction or malfunction of the CPU unit 10 due to an increase in the component temperature.

If the component temperature does not exceed the temperature when the component temperature exceeds the temperature, if the component temperature is not exceeded by changing the item n in the operation condition, the temperature analysis unit 12 calculates the temperature of the component Select an example of changing the operating condition. In this case, the temperature analyzing section 12 selects the operation condition changing example in which the number of changes of the operation condition, which is the change item, is changed so as to be changed within the required range. Specifically, the temperature analyzing unit 12 selects a small number of operating conditions to be changed among the combinations of operating conditions determined to be acceptable in the corresponding relationship table 101. [

Therefore, if the component temperature is over the temperature, that is, if the result is Yes in step S40, then in step S50, the temperature analyzer 12 sets n to a natural number and sets n = 1. In step S60, the temperature analyzing unit 12 determines whether there is a combination of operating conditions in which the component temperature does not exceed the temperature when the operating conditions of the n items are changed from among the combinations of the operating conditions extracted from the corresponding relationship table 101 ≪ / RTI > The temperature analyzing unit 12 here judges whether or not the component temperature does not exceed the temperature when the operating condition of one item is changed from among the combinations of the operating conditions extracted from the corresponding relationship table 101. [ Specifically, the temperature analyzing unit 12 determines whether or not any one of the ambient temperature TA, the operating frequency, the presence or absence of logging, the logging period, the use of Ethernet communication, the number of memory access instructions, , It is determined whether or not the component temperature does not exceed the temperature. In other words, the temperature analyzing unit 12 determines whether the component temperature does not exceed the temperature when any one of the items of the operation condition in the corresponding relationship table 101 is changed.

If the component temperature does not exceed the temperature when the n items in the operating conditions are changed, that is, if the result at step S60 is Yes, at step S70, the temperature analysis unit 12 presents the user with an example of changing the operating condition. The temperature analyzing unit 12 presents to the user an example of an operation condition change that is determined that the temperature is not exceeded when the n items are changed. The operating condition determined by the temperature analyzing unit 12 based on the use function in the use function storage unit 13 and the control program in the control program storage unit 14 is the first operating condition. The second operating condition is an example of changing the operating condition that the temperature analyzing unit 12 presents to the user when the temperature of the part is over the temperature.

In the case of the correspondence relation table 101 shown in Fig. 4, the combination of the operation conditions of No. 2 is changed in comparison with the combination of the No. 1 operation conditions, and the point of the operation frequency is changed. Therefore, when the CPU unit 10 changes the combination of the No. 1 operating conditions to the combination of the No. 2 operating conditions, the operating condition of one item is changed. The combination of the operating conditions of No. 2 is a pass / fail determination result.

On the other hand, in the case of the correspondence relationship table 101 shown in Fig. 4, the combination of the operation conditions of No. 3 indicates that the acceptability determination result is rejection. Therefore, the temperature analysis section 12 does not select the combination of the No. 3 operating conditions.

In the case of the correspondence relationship table 101 shown in Fig. 4, the combination of the operating conditions of No. 4 is changed in comparison with the combination of the No. 1 operating conditions, and the points of the operating frequency and the ambient temperature are changed. Therefore, when the CPU unit 10 changes the combination of the No. 1 operating conditions to the combination of the No. 4 operating conditions, the operating conditions of the 2 items are changed. The combination of the operating conditions of No. 4 indicates that the acceptability determination result is acceptable. When a combination of operation conditions of No. 2 and No. 4 is selected, a user who does not need up to the upper limit of the logging cycle can use the operation frequency exceeding the upper limit of the specification set by the maker of the CPU unit 10 .

The temperature analyzing section 12 first selects the combination of the operation conditions of No. 2 and No. 4 from No. 2 in which the number of operating conditions is small. The temperature analyzing unit 12 sets the selected combination of operating conditions as an example of changing the operating condition and sends it to the result output unit 16. [ As a result, the result output unit 16 causes the display device 2 to display an example of changing the operating condition.

Thereafter, in step S80, the temperature analyzing unit 12 determines whether or not the approval by the user has been accepted. When the display device 2 displays an example of the operation condition change, an instruction is input to the CPU unit 10 as to whether or not to approve the operation condition change example being displayed by the user. The user may input the instruction by the function setting unit 19 and send it to the temperature analysis unit 12 or the ambient temperature reception unit 11B may receive the temperature instruction and send it to the temperature analysis unit 12. [ When the CPU unit 10 receives the approval or disapproval instruction, the CPU unit 10 sends the instruction to the temperature analysis unit 12. [

In addition, the temperature analyzing section 12 may display a plurality of examples of the operation condition change on the display device 2. [ In this case, the display device 2 displays a plurality of operating condition changing examples. Then, the user inputs to the CPU unit 10 an instruction for designating a certain operation condition change example from among the displayed operation condition change examples, or an instruction indicating that neither operation condition change example is approved.

When the temperature analysis section 12 receives the non-approval from the user, that is, if the result is No in step S80, the temperature analysis section 12 sets n = n + 1 in step S90. Here, the temperature analyzing unit 12 sets n = 2 when it is judged that the non-acceptance has been accepted. If the component temperature exceeds the temperature even when the n items in the operating conditions are changed, that is, if the result is No in step S60, the temperature analyzing unit 12 sets n = n + 1 in step S90. Here, the temperature analyzing section 12 sets n = 2 when the component temperature exceeds the temperature even if one of the operating conditions is changed.

After the processing of step S90, the temperature analyzing section 12 repeats the processing of steps S60 to S80. The temperature analyzing unit 12 repeats the processing in steps S60 to S80 until it is determined in step S80 that approval has been received.

If the temperature analysis section 12 determines that the approval has been received, that is, if the answer is Yes in step S80, the temperature analysis section 12 sends the operation condition of the approved operation condition change example to the control section 17. Thus, in step S100, the control unit 17 changes the operation condition currently set to the operation condition sent from the temperature analysis unit 12. [ The temperature analysis unit 12 registers the operation condition of the approved operation condition change example in the use function storage unit 13.

If the component temperature is not over the temperature, that is, if the result is No in step S40, the CPU unit 10 does not change the operating condition and ends the component temperature determination process. Incidentally, the temperature analyzing section 12 may stop the CPU unit 10 when the component temperature exceeds the temperature even if the number of items of the upper limit value is changed. Also, even when the component temperature is not over the temperature, the CPU unit 10 may change the operating conditions. Here, an example of changing the operating condition in the case where the component temperature does not exceed the temperature will be described.

The life span of the component 25 included in the CPU unit 10 varies depending on the temperature at which the CPU unit 10 is used. Therefore, the lifetime of the CPU unit 10 also changes depending on the internal temperature of the case provided in the CPU unit 10. [ However, the component 25 may be used in an environment in which the ambient temperature TA is low, or only a small use function may be used. In such a case, the performance of the CPU unit 10 may be lowered more than necessary.

Therefore, the CPU unit 10 of the embodiment can change the operating condition satisfying the upper limit permissible temperature even when the component 25 is below the upper permissible temperature, in addition to the case where the component 25 exceeds the upper permissible temperature Present to the user.

When the component temperature is equal to or lower than the upper limit permissible temperature, the temperature analyzing unit 12 performs an operation such that the operation performance of the CPU unit 10 is improved more than the combination of the present (present) operating conditions used for determining whether or not the component temperature is acceptable Select the condition change example. In this case, the temperature analyzing unit 12 selects a combination of operating conditions in which the component temperature is equal to or lower than the upper limit allowable temperature, based on the corresponding relationship table 101. [ In other words, the temperature analyzing unit 12 selects a combination of the operating conditions in which the acceptability determination result is acceptable, among the corresponding relationship tables 101. Specifically, when the component temperature is equal to or lower than the upper limit permissible temperature, the temperature analyzing section 12 can perform an operation condition changing example that can perform a higher speed control than a developing operation, an operation condition changing example in which a use function that is not used is added, Selects any of the raised operating condition changes. In addition, the temperature analyzing section 12 may select an operation condition changing example in which a higher speed control than the current, addition of a use function, and a plurality of changes in the rise of the ambient temperature TA are changed. An example of an operation condition change that the temperature analysis unit 12 presents to the user is a third operation condition when the component temperature does not exceed the temperature.

The temperature analyzing unit 12 sets the selected combination of operating conditions as an example of changing the operating condition and sends it to the result output unit 16. [ As a result, the result output unit 16 causes the display device 2 to display an example of changing the operating condition. Thereafter, when the user gives an example of changing the operating condition displayed on the display device 2, the temperature analyzing unit 12 sends the operating condition of the approved operating condition changing example to the control unit 17. Thereby, the control section 17 changes the operating condition currently being set to the operating condition sent from the temperature analyzing section 12.

Thus, even when the component temperature is equal to or lower than the upper limit permissible temperature, the CPU unit 10 may present the user with an example of changing the operating condition. Thereby, the CPU unit 10 can increase the use of the component 25 in a high-temperature environment, the calculation performance is improved, or when the component 25 is used in a low-temperature environment, when the computing performance is low, It is possible to present the user with an increase in the number of used functions. As a result, the CPU unit 10 can optimize the component temperature, the arithmetic operation performance, and the function at the time of performing the control operation.

When the CPU unit 10 performs the temperature determination before starting the control of the controlled device, the temperature analyzing unit 12 can perform the temperature determination even before the component 25 is placed. When the CPU unit 10 performs the temperature determination during the control of the controlled device, the temperature analysis unit 12 can perform the temperature determination based on the actual placement environment of the component 25. [

Next, an example of the operating condition when the CPU unit 10 executes the control process to the controlled device will be described. 5 is a diagram showing an example of an operation condition according to the embodiment. The operation condition table 30 shown in Fig. 5 is an information table in which the operation condition when the CPU unit 10 executes the process is registered. The operation condition table 30 is referred to when the correspondence relationship table 101 is created by the user.

In the operation condition table 30 shown in Fig. 5, a large item of the operation condition, a component 25, and a small item of the operation condition are associated with each other. Examples of large items of operating conditions are computing performance, logging, Ethernet communication, data access_l, data access_2.

The component 25 corresponding to the computing performance is an ASIC and a work memory. The sub-item corresponding to the calculation performance is the operating frequency. Therefore, the operating conditions of the arithmetic performance are the operating frequency of the ASIC and the work memory.

The component 25 corresponding to the logging is ASIC and SD (Secure Digital) card. The sub-item corresponding to the logging is the presence or absence of the function, the logging period, and the logging score. The component 25 corresponding to the Ethernet communication is the Ether PHY. The sub-item corresponding to the Ethernet communication is the presence or absence of communication and the communication speed.

Data Access_1 is a data access function to a nonvolatile memory that retains data even when power is disconnected. The component 25 corresponding to data access_l is an ASIC and non-volatile memory. The sub-item corresponding to data access_l is the frequency of the memory access weight and the access command. The sub-item corresponding to data access_l may include the number of memory access instructions.

Data Access_2 is a data access function to a volatile memory that loses data when power is disconnected. The part 25 corresponding to the data access_2 is an ASIC and volatile memory. The sub-item corresponding to data access_2 is the frequency of the memory access weight and the access command. The sub-item corresponding to data access_2 may include the number of memory access instructions. With reference to this operating condition table 30, the user creates the corresponding relationship table 101. [

Items other than the frequency of the access command in the sub-item of Fig. 5 are individually set in the setting tool. Therefore, the temperature analyzing unit 12 extracts the operation condition corresponding to the item other than the frequency of the access instruction from the use function in the use function storage unit 13. The temperature analysis unit 12 calculates an operation condition corresponding to the item of frequency of the access command based on the control program.

When the CPU unit 10 has the function of the input / output unit 51, the temperature analysis unit 12 calculates the operation conditions corresponding to the number of times and times of relay on and off based on the control program . When the CPU unit 10 has the function of the power source unit 52, the temperature analysis unit 12 can calculate the operating condition corresponding to the voltage applied to the power source based on the control program.

The CPU unit 10 included in the PLC 1 is equipped with peripheral interfaces and various use functions. An example of a peripheral interface is an Ethernet or SD card. The CPU unit 10 of the embodiment can estimate the temperature of the Ether PHY and the SD card based on various operating conditions such as the presence / absence of Ethernet communication, the presence of logging, and the logging period, . Since the CPU unit 10 is provided with the control program storage unit 14 and the use function storage unit 13, it is possible to determine whether or not the component temperature is statically determined based on the control program and the use function.

Next, a tool in which the operating conditions are set by the user will be described. 6 is a diagram showing an example of a setting screen for setting an operating condition according to the embodiment. Fig. 6 shows a tool screen 40 of the CPU parameter setting tool, which is an example of the setting screen. The CPU parameter setting tool is a tool for setting parameters to be used in the CPU unit 10. [

The tool screen 40 has an area 41 for selecting an operating frequency and an area 42 for setting a value of the operating frequency. When a numeric value is input to the area 42 after the user selects the operating frequency in the area 41, the CPU parameter setting tool sets the input value to the operating frequency.

7 is a diagram for explaining access frequency calculation processing according to the embodiment. The access frequency calculation processing is processing for calculating the frequency of the access command. The frequency of the access instruction is the frequency at which the CPU unit 10 accesses the nonvolatile memory or the volatile memory at the program execution time.

7 shows a program example in which the program execution time is 1 ms. In this program, data is accessed to the volatile memory to store "0" in the first line processing, data is accessed to the nonvolatile memory in the second line processing to store "0", and in the third line processing, And " 1 " is stored.

The temperature analyzing unit 12 can calculate the frequency of access commands by dividing the number of executions of each function by the number of program executions. In the example of Fig. 7, since the data access to the volatile memory is performed twice in 1 ms, the temperature analyzing unit 12 calculates the number of data accesses per second to the volatile memory as twice / 1 ms = 2000 times / s. Since the data access to the nonvolatile memory is performed once per 1 ms, the temperature analyzing section 12 calculates the number of data accesses per second to the nonvolatile memory at once / 1 ms = 1000 times / s.

Here, the hardware configuration of the CPU unit 10 explained in the embodiment will be described. 8 is a diagram showing a hardware configuration example of the CPU unit according to the embodiment. The CPU unit 10 can be realized by the control circuit 300 shown in Fig. 8, that is, the processor 301 and the memory 302. [ The processor 301 is a CPU (central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP (Digital Signal Processor), and system LSI (Large Scale Integration). The memory 302 may be a nonvolatile or volatile semiconductor memory such as a RAM (Random Access Memory) and a ROM (Read Only Memory), or may be a magnetic disk or a flexible disk.

The CPU unit 10 is realized by reading and executing a program for causing the processor 301 to operate as the CPU unit 10, which is stored in the memory 302. [ The program is stored in the storage unit 14 in accordance with a procedure or a method of the ambient temperature receiving units 11A and 11B, the temperature analyzing unit 12, the result output unit 16, the control unit 17, the instruction output unit 18, Can be said to be executed by a computer. The memory 302 is also used as a temporary memory when the processor 301 executes various processes.

As such, the program executed by the processor 301 is a computer program product having a computer-readable non-transitory recording medium, including a plurality of instructions for determining a component temperature, executable by the computer . The program executed by the processor 301 causes the computer to execute a plurality of instructions to determine the temperature.

In addition, the temperature analyzing unit 12 may be realized by dedicated hardware. A part of the functions of the temperature analyzing unit 12 may be realized by dedicated hardware, and some of them may be realized by software or firmware.

According to the embodiment, the CPU unit 10 determines the temperature of the component 25 based on the operation condition when the processing by the CPU unit 10 is executed. Therefore, the CPU unit 10 It is possible to accurately determine whether or not the component temperature at the time of the execution of the process by the control unit is an appropriate temperature.

Since the temperature of the component 25 is determined by using the operating environment in which the CPU unit 10 operates, the computing performance set in the CPU unit 10, and the use function used by the CPU unit 10, It is possible to accurately determine whether or not the temperature is an appropriate temperature. It is also possible to accurately determine whether or not the temperature of the component 25, such as various memories, an Ether PHY, and an SD card, provided in the CPU unit 10 is an appropriate temperature.

The configuration shown in the above embodiment represents one example of the content of the present invention and can be combined with other known technology and a part of the configuration can be omitted or changed within a range not departing from the gist of the present invention Do.

1: PLC 2: Display device
3: Alarm output device 10: CPU unit
11A, 11B; Ambient temperature receiving unit 12: temperature analyzing unit
13: Use function storage unit 14: Control program storage unit
15: Correspondence DB 16: Result output unit
19: Function setting section 20: Temperature sensor
25: part 101: correspondence table

Claims (10)

Wherein the first operation condition determining unit determines a first operation condition that is a use condition of the user and determines that the first operation condition includes a function exceeding the specification upper limit value when the first operation condition includes a function exceeding the specification guarantee specification upper limit value, A judging unit for judging whether or not the component temperature, which is the temperature of the component,
And a result presentation unit for presenting the determination result that is a result of the determination to the display device. The method according to claim 1,
Further comprising a correspondence relationship storage unit for storing correspondence relation information in which a candidate of the operating condition used when controlling the controlled device is associated with the determination result when the candidate is used,
Wherein the determination unit selects the first operation condition among the candidates and reads the determination result corresponding to the selected first operation condition from the corresponding relationship information and sends the result to the result presentation unit. The method according to claim 1,
The determination unit may calculate the component temperature using the formula for calculating the component temperature and the first operating condition, and determine whether the component temperature is acceptable by comparing the calculated component temperature with the upper limit acceptable temperature Characterized by a control unit. The method according to any one of claims 1 to 3,
Wherein the determination unit determines the first operating condition based on a function used to control the controlled device or a control program used to control the controlled device. The method of claim 2,
Further comprising a temperature measuring unit for measuring an environmental temperature of the environment in which the component is disposed,
Wherein the determination unit reads the determination result from the corresponding relationship information based on the environmental temperature measured by the temperature measurement unit. The method according to any one of claims 1 to 5,
And the result display unit outputs an instruction for outputting an alarm to an external device when the component temperature is failed. The method of claim 2,
When the component temperature is not acceptable, the judging section extracts a second operating condition in which the component temperature is acceptable from the candidates,
And the result presentation unit presents the second operating condition to the display device. The method of claim 2,
When the component temperature is acceptable, the determination section extracts a third operating condition that improves the performance at the time of the control from among the candidates,
And the result presentation unit presents the third operating condition to the display device. Wherein the first operation condition determining unit determines a first operation condition that is a use condition of the user and determines that the first operation condition includes a function exceeding the specification upper limit value when the first operation condition includes a function exceeding the specification guarantee specification upper limit value, A temperature analyzer for calculating a component temperature which is a temperature of the component with respect to a combination of the functions,
And a result presentation unit for presenting the temperature calculation result as a result of the calculation to the display device. A determining step of determining a first operating condition that is a use condition of the user;
Wherein when the first operation condition includes a function exceeding the design guarantee specification upper limit value, a combination of a function exceeding the specification upper limit value and a function that does not exceed the specification upper limit value, A determination step of determining,
And a result presentation step of presenting the determination result that is a result of the determination to the display device.

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