WO2024052994A1 - Analog current output device, fa system, break prediction device, break prediction method, and program - Google Patents

Analog current output device, fa system, break prediction device, break prediction method, and program Download PDF

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Publication number
WO2024052994A1
WO2024052994A1 PCT/JP2022/033430 JP2022033430W WO2024052994A1 WO 2024052994 A1 WO2024052994 A1 WO 2024052994A1 JP 2022033430 W JP2022033430 W JP 2022033430W WO 2024052994 A1 WO2024052994 A1 WO 2024052994A1
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Prior art keywords
cable
time
resistance value
value
resistance
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PCT/JP2022/033430
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French (fr)
Japanese (ja)
Inventor
圭祐 木本
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三菱電機株式会社
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Priority to PCT/JP2022/033430 priority Critical patent/WO2024052994A1/en
Priority to JP2023508518A priority patent/JP7292550B1/en
Publication of WO2024052994A1 publication Critical patent/WO2024052994A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity

Definitions

  • the present disclosure relates to an analog current output device, an FA system, a wire breakage prediction device, a wire breakage prediction method, and a program.
  • Patent Document 1 discloses a disconnection prediction device that determines that a cable disconnection is progressing when the measured resistance value of the cable exceeds a predetermined threshold value. has been done.
  • the disconnection prediction device described in Patent Document 1 has a problem in that it can only determine that the cable disconnection is progressing, but cannot predict when the cable will actually disconnect.
  • This disclosure has been made in view of the above circumstances, and aims to predict when a cable will break in the future.
  • an analog current output device outputs an analog current signal obtained by converting a control signal transmitted from a control device to an external device as a control target via a cable.
  • the analog current output device includes a D/A converter that converts input control signals into analog current signals, and an A/D converter that converts analog voltage signals applied to external equipment and cables into digital voltage signals.
  • a resistance value calculation unit that calculates the resistance value of the external device and the cable based on the control signal and the digital voltage signal, and an initial value of the resistance value calculated when the cable is first connected to the external device.
  • the present invention includes a wire breakage time calculation unit that calculates a wire breakage time based on the cable breakage time, and a wire breakage time output portion that outputs the wire breakage time.
  • FIG. 1 A diagram showing a functional configuration of an analog current output device according to Embodiment 1.
  • Block diagram showing the hardware configuration of the analog current output device according to Embodiment 1 A diagram illustrating a display example of a graph image of a resistance value change function according to Embodiment 1.
  • a diagram showing a display example of an input screen according to Embodiment 1 Flowchart of disconnection time output processing according to Embodiment 1
  • a diagram showing the functional configuration of a wire breakage prediction device according to Embodiment 2 Flowchart of replacement time output processing according to Embodiment 2
  • Analog current output device 100 according to Embodiment 1 of the present disclosure is an example of a disconnection prediction device that predicts disconnection of a cable connected to an external load.
  • an analog current output device 100 converts a control signal transmitted from a control device 2 into an analog current signal in an FA system 1 to an external device that is an example of an external load and is a control target. 3 via cable 4.
  • the control signal is, for example, a signal that controls the analog current signal output by the analog current output device 100 using a voltage value.
  • the analog current output device 100 includes a D/A converter 110 that converts a control signal received from the control device 2 into an analog current signal, and an analog voltage signal that is applied to the external device 3 and the cable 4. It includes an A/D converter 120 that converts the voltage into a digital voltage signal.
  • the analog current output device 100 also includes an information control section 130 that controls information, an information storage section 140 that stores information, and an information output section 150 that outputs information. That is, the analog current output device 100 is a computer device including a D/A converter 110 and an A/D converter 120.
  • the information control unit 130 includes a resistance value calculation unit 131 that calculates the resistance values of the external device 3 and the cable 4, a disconnection time calculation unit 132 that calculates the disconnection time when the cable 4 is disconnected, and information regarding calculation of the disconnection time. It includes a calculation-related information acquisition unit 133 that acquires certain calculation-related information.
  • the information storage unit 140 also includes a resistance value storage unit 141 that stores resistance values of the external device 3 and the cable 4, and a calculation-related information storage unit 142 that stores calculation-related information.
  • the information output unit 150 also includes an input screen display unit 151 that displays an input screen 160 (described later) on which the user of the analog current output device 100 inputs calculation-related information, a disconnection time output unit 152 that outputs the disconnection time, and a replacement unit (described later). It includes a replacement time output unit 153 that outputs the time.
  • the analog current output device 100 includes a control section 51 that executes processing according to a control program 59, for example.
  • the control unit 51 includes a CPU (Central Processing Unit).
  • the control unit 51 functions as the information control unit 130 shown in FIG. 2 according to the control program 59.
  • the analog current output device 100 includes a main storage section 52 that loads a control program 59 and is used as a work area for the control section 51.
  • the main storage unit 52 includes a RAM (Random Access Memory).
  • the analog current output device 100 includes an external storage section 53 that stores a control program 59 in advance.
  • the external storage section 53 supplies the data stored by this program to the control section 51 according to instructions from the control section 51, and stores the data supplied from the control section 51.
  • the external storage unit 53 includes a recording medium such as a ROM (Read Only Memory), a flash memory, an HDD (Hard Disk Drive), and an SSD (Solid State Drive).
  • the external storage section 53 functions as the information storage section 140 shown in FIG.
  • the analog current output device 100 includes an operation section 54 operated by the user.
  • the input information is supplied to the control section 51 via the operation section 54 .
  • the operation unit 54 includes information input components such as a keyboard, a mouse, and a touch panel.
  • the analog current output device 100 also includes a display section 55 that displays information input via the operation section 54 and information output from the control section 51.
  • the display unit 55 includes a display device such as an LCD (Liquid Crystal Display) or an OLED (Organic Light Emitting Diode) display.
  • the display section 55 functions as the information output section 150 shown in FIG.
  • the analog current output device 100 includes a transmitting/receiving section 56 that transmits and receives information.
  • the transmitting/receiving unit 56 includes information communication components such as a communication network termination device and a wireless communication device connected to the network.
  • the main storage section 52, external storage section 53, operation section 54, display section 55, and transmission/reception section 56 are all connected to the control section 51 via the internal bus 50. .
  • the analog current output device 100 includes a resistance value calculation step performed by the resistance value calculation unit 131 of the information control unit 130, a disconnection time calculation step performed by the disconnection time calculation unit 132, and a calculation related information acquisition performed by the calculation related information acquisition unit 133. Execute the steps. Further, for example, the analog current output device 100 executes a resistance value storage step performed by the resistance value storage unit 141 of the information storage unit 140 and a calculation related information storage step performed by the calculation related information storage unit 142.
  • the analog current output device 100 also includes an input screen display step performed by the input screen display section 151 of the information output section 150, a disconnection time output step performed by the disconnection time output section 152, and a replacement time output step performed by the replacement time output section 153. Execute the steps.
  • the D/A converter 110 converts the control signal input from the information control unit 130 into digital-to-analog, and outputs an analog current signal from the cable 4 to the external device 3.
  • the A/D converter 120 performs analog-to-digital conversion on an analog voltage signal generated by measuring the voltage applied to the external device 3 and the cable 4, and outputs the digital voltage signal to the information control unit 130.
  • the resistance value calculation unit 131 calculates the resistance values of the external device 3 and the cable 4 based on the control signal input to the D/A converter 110 and the digital voltage signal output from the A/D converter 120. .
  • the resistance value of the external device 3 and the cable 4 refers to the total value of the resistance value of the external device 3 and the resistance value of the cable 4.
  • the resistance value calculation unit 131 calculates the resistance values of the external device 3 and the cable 4 using Ohm's law.
  • the resistance value calculation unit 131 calculates an initial resistance value that is an initial value of the resistance values of the external device 3 and the cable 4 when the cable 4 is first connected to the external device 3.
  • the resistance value calculation unit 131 also calculates a resistance elapsed value which is the resistance value of the external device 3 and the cable 4 after a predetermined period of time, for example, one year has elapsed since the cable 4 was first connected to the external device 3. Calculate.
  • the initial resistance value is Z 0 and the resistance elapsed value is Z 1 .
  • the calculation-related information acquisition unit 133 obtains, as calculation-related information, the initial radius value, length and resistivity, which is the initial value of the radius of the cable 4, the resistance value of the external device 3, and the resistance predetermined by the user, which will be described later. Information including a slope threshold, which is a threshold for the slope of the tangent to the value change function, is acquired.
  • the wire breakage time calculation unit 132 calculates the wire breakage time based on the resistance initial value Z 0 , the resistance elapsed value Z 1 , and the calculation related information.
  • the disconnection time calculation unit 132 calculates the resistance initial value Z 0 , the resistance elapsed value Z 1 , the initial radius value r 0 , the length l, and the resistivity ⁇ of the cable 4 included in the calculation-related information stored in the information storage unit 140.
  • a resistance value change function which is a function indicating the correspondence between the passage of time and a change in resistance value, is specified using the resistance value RL of the external device 3.
  • the resistance value Z of the external device 3 and the cable 4 is calculated by the formula shown in Equation 1 below.
  • the radius elapsed value r1 of the cable 4 is calculated by the following equation 3 based on the equation 2 described above.
  • Equation 4 can be rephrased as a formula for a resistance value change function Z, which is a function indicating the correspondence between the elapsed number of years y and the change in the resistance value Z, as shown in FIG. be able to.
  • Z' is a formula obtained by differentiating the formula of the resistance value change function Z shown in Equation 4 above with respect to the number of elapsed years y, then the differentiated formula Z' [ ⁇ /year] can be expressed as the formula shown in Equation 5 below. Become.
  • Equation 5 the value of the differentiated mathematical expression Z' shown in the above-mentioned Equation 5 can be rephrased as the slope of the tangent to the resistance value change function Z shown in the above-mentioned Equation 4 with respect to the elapsed number of years y.
  • the values shown in FIG. 5 are the values of the resistance value Z and the slope Z' of the tangent line when the number of elapsed years y [years] is 0 to 12 years, calculated from the formulas shown in Equations 4 and 5 above.
  • the wire breakage time calculation unit 132 can calculate the predicted value of the wire breakage time based on the value of the slope Z' of the tangent to the resistance value change function Z. For example, the wire breakage time calculation unit 132 can calculate the elapsed number of years y at which the value of the slope Z' of the tangent to the resistance value change function Z suddenly increases as the wire breakage time. Note that the number of years y is calculated by the following formula shown in Equation 6 based on the above-mentioned Equation 5.
  • the disconnection timing calculation unit 132 calculates the value of the slope Z' of the tangent of the resistance value change function Z to the slope threshold value included in the calculation related information, based on the formula shown in Equation 6 above.
  • a tangent line is specified, and the value of the number of years y and the value of the resistance value Z, which are the points of contact between the tangent line and the resistance value change function Z, are calculated.
  • the slope threshold value is the slope Z' of the tangent to the resistance value change function Z at which the user recognizes that there is a strong possibility that the cable 4 will break and the cable 4 needs to be replaced if it becomes larger than this value.
  • the value of is predetermined by the user.
  • the wire breakage time calculation unit 132 calculates the calculated number of years y as the replacement time, and also calculates the time when a predetermined period, for example, three months has elapsed from the replacement time, as the wire breakage time.
  • the resistance value storage unit 141 stores the calculated resistance value Z. Therefore, the resistance value storage section 141 stores at least the resistance initial value Z 0 and the resistance elapsed value Z 1 . In this embodiment, when the resistance value calculation unit 131 calculates the resistance initial value Z 0 and the resistance elapsed value Z 1 , the resistance value calculation unit 131 stores the resistance initial value Z 0 and the resistance elapsed value Z 1 in the resistance value storage unit 141.
  • the calculation-related information storage unit 142 stores the acquired calculation-related information. Note that in this embodiment, when the calculation-related information acquisition unit 133 acquires the calculation-related information, the calculation-related information storage unit 142 stores the calculation-related information.
  • the input screen display unit 151 displays on the display unit 55 an input screen 160 shown in FIG. 6 in which calculation-related information is input by the user using the operation unit 54.
  • the input screen 160 includes, in order from the top, a radius initial value input field 161 in which the initial radius value r0 of the cable 4 is inputted by the user using the operation unit 54; It includes a length input field 162 in which the length 1 is input, and a resistivity input field 163 in which the resistivity ⁇ of the cable 4 is input.
  • the input screen 160 includes an external device resistance value input field 164 provided below the resistivity input field 163, into which the resistance value RL of the external device 3 is input by the user using the operation unit 54.
  • the input screen 160 includes a slope threshold input field 165 provided below the external device resistance value input field 164, into which a slope threshold predetermined by the user is inputted by the user using the operation unit 54.
  • the wire breakage time output unit 152 outputs the wire breakage time to the user by displaying the wire breakage time calculated by the wire breakage time calculation unit 132 on the display unit 55. Furthermore, the replacement time output unit 153 displays the replacement time calculated by the disconnection time calculation unit 132 on the display unit 55, thereby outputting the replacement time to the user.
  • the wire breakage time output section 152 and the replacement time output section 153 display a graph image of the resistance value change function Z shown in FIG. 4, and display an image indicating the wire breakage time and the replacement time in the graph image. Displays the time of wire breakage and the time of replacement.
  • the resistance value calculation unit 131 calculates the initial resistance of the external device 3 and the cable 4 based on the control signal input to the D/A converter 110 and the digital voltage signal output from the A/D converter 120.
  • a value Z 0 is calculated, and the resistance initial value Z 0 is stored in the resistance value storage unit 141 (step S103).
  • the information control unit 130 determines whether a predetermined period of time, for example, one year, has passed since the resistance value storage unit 141 stored the initial resistance value Z0 (step S104). If the predetermined period has not elapsed (step S104; N), the information control unit 130 repeats the process of step S104 until the predetermined period has elapsed.
  • step S104 when a predetermined period has elapsed (step S104; Y), the resistance value calculation unit 131 of the information control unit 130 outputs a control signal input to the D/A converter 110 and an output from the A/D converter 120.
  • the resistance elapsed value Z1 of the external device 3 and the cable 4 is calculated based on the digital voltage signal, and the resistance elapsed value Z1 is stored in the resistance value storage section 141 (step S105).
  • the wire breakage time calculation unit 132 calculates the wire breakage time and the replacement time based on the resistance initial value Z 0 and resistance elapsed value Z 1 stored in the resistance value storage unit 141 and the calculation related information (step S106). Specifically, the disconnection time calculation unit 132 calculates the resistance initial value Z 0 , the resistance elapsed value Z 1 , the initial radius value r 0 of the cable 4 included in the calculation-related information, the length l, the resistivity ⁇ , and the external device 3
  • the resistance value change function Z shown in Equation 4 above is specified using the resistance value R L of .
  • the wire breakage time calculation unit 132 identifies the tangent line whose slope Z' value of the tangent line of the resistance value change function Z is the slope threshold value included in the calculation related information based on the formula shown in Equation 6 above, and The value of the elapsed years y and the value of the resistance value Z, which are the points of contact between the tangent and the resistance value change function Z, are calculated. Then, the wire breakage time calculation unit 132 calculates the calculated number of years y as the replacement time, and also calculates the time when a predetermined period has elapsed from the replacement time as the wire breakage time.
  • the disconnection time output unit 152 and the replacement time output unit 153 display the disconnection time and replacement time calculated by the disconnection time calculation unit 132 (step S107), and the process ends.
  • the D/A converter 110 converts the control signal input from the control device 2 to the information control section 130 into an analog current signal.
  • the A/D converter 120 converts analog voltage signals applied to the external device 3 and the cable 4 into digital voltage signals.
  • the resistance value calculation unit 131 calculates the resistance value Z of the external device 3 and the cable 4 based on the control signal and the digital voltage signal, and calculates the resistance initial value Z 0 and resistance elapsed value as the calculated resistance value Z.
  • Z 1 is stored in the resistance value storage section 141.
  • the disconnection time calculation unit 132 calculates the disconnection time of the cable 4 based on the resistance initial value Z 0 and the resistance elapsed value Z 1 , and the disconnection time output unit 152 outputs the disconnection time to the user.
  • the analog current output device 100 can predict when the cable 4 will break in the future.
  • the initial resistance value Z 0 when the cable 4 is first connected to the external device 3 and the resistance initial value Z 0 when the cable 4 is first connected to the external device 3 are The breakage timing of the cable 4 can be calculated and output simply by measuring the resistance elapsed value Z1 at a time when a predetermined period has elapsed since the breakage of the cable 4.
  • the analog current output device 100 according to the present embodiment can reduce the workload of predicting cable breakage more than the breakage prediction device described in Patent Document 1.
  • the calculation related information acquisition unit 133 calculates the initial radius r 0 , length l, resistivity ⁇ , and resistance value R L of the external device 3 of the cable 4 . Obtain calculation-related information including. Then, the wire breakage time calculation unit 132 calculates the wire breakage time based on the resistance value change function Z specified using the resistance initial value Z 0 , the resistance elapsed value Z 1 , and the calculation related information. By doing so, the analog current output device 100 according to the present embodiment can predict the disconnection timing of the cable 4 more accurately than an analog current output device or a disconnection prediction device that does not calculate the disconnection timing based on the resistance value change function. Predictable.
  • the calculation related information includes the slope threshold value predetermined by the user. Then, the wire breakage time calculating section 132 calculates the replacement time when the value of the slope Z' of the tangent to the resistance value change function Z becomes the slope threshold value, and the replacement time output section 153 outputs the calculated replacement time. By doing so, the analog current output device 100 according to the present embodiment calculates the replacement time when the value of the slope of the tangent of the resistance value change function becomes the slope threshold value, and the analog current output device or disconnection prediction device that does not output the replacement time. It is possible to predict the breakage time and replacement time of the cable 4 with higher accuracy than the conventional method.
  • the threshold value of the resistance value used for determining whether or not the cable disconnection is progressing is determined by the temperature in the normal state where the disconnection has not progressed. This value is larger than the maximum value of the cable resistance value, excluding changes due to load fluctuation factors and load fluctuation factors. Specifically, the threshold value is set to a value obtained by adding a predetermined value to the initial value of the resistance value of the cable in a normal state.
  • the predetermined value used when setting the threshold value is a value whose basis is unclear, and therefore, the predetermined value used when setting the threshold value is a value whose basis is unclear, so There is a risk that the cable will be determined to have progressed to a disconnection, and there is a risk that the cable will be replaced at a stage where the cable has a much longer lifespan than its actual lifespan.
  • the slope threshold value is determined by the resistance value change function Z at which the user recognizes that there is a sufficient possibility that the cable 4 will break if it becomes larger than this value.
  • the value of the slope Z' of the tangent line is predetermined.
  • the analog current output device 100 capable of predicting the time of wire breakage has been described, but a device other than the analog current output device 100 may be used as long as it is possible to predict the time of wire breakage.
  • the disconnection prediction device 200 according to the second embodiment will be described in detail with reference to FIGS. 8 and 9. Note that in the second embodiment, configurations that are different from those in the first embodiment will be described, and descriptions of the same configurations as in the first embodiment will be omitted because they are redundant.
  • a disconnection prediction device 200 according to Embodiment 2 of the present disclosure is a computer device that predicts disconnection of a cable 4 connected to an external load 30.
  • the disconnection prediction device 200 includes an information control section 130, an information storage section 140, and an information output section 150 similar to those in the first embodiment.
  • the information control section 130 includes a resistance value calculation section 131, a wire breakage time calculation section 132, and a calculation-related information acquisition section 133 similar to those in the first embodiment.
  • the information storage section 140 includes a resistance value storage section 141 and a calculation-related information storage section 142 similar to those in the first embodiment.
  • the information output section 150 includes an input screen display section 151, a disconnection time output section 152, and a replacement time output section 153 similar to those in the first embodiment.
  • the resistance value calculation unit 131 calculates the resistance value Z of the external load 30 and the cable 4 based on the current output from the cable 4 to the external load 30 and the voltage applied to the external load 30 and the cable 4. .
  • the resistance value calculation unit 131 calculates the resistance value Z not only from the resistance initial value Z 0 and the resistance elapsed value Z 1 but also after a predetermined period has elapsed. For example, the resistance value calculation unit 131 calculates the resistance value Z every time a predetermined confirmation period, for example, one month passes.
  • disconnection time calculation unit 132 calculation-related information acquisition unit 133
  • input screen display unit 151 are the same as in the first embodiment by replacing “external device” with “external load” and “3” with “30”. This is an explanation. Therefore, illustrations and detailed descriptions of the wire breakage time calculation section 132, the calculation-related information acquisition section 133, and the input screen display section 151 will be omitted to avoid redundant explanations.
  • the wire breakage time calculation unit 132 calculates the value of the number of years y that has passed and the value of the resistance value Z, which is the point of contact between the broken line and the resistance value change function Z, where the value of the slope Z' is the slope threshold value.
  • the calculated resistance value Z is defined as a resistance threshold value that is a threshold value of the resistance value Z.
  • the resistance threshold Z s is Z s
  • r 0 0.512 ⁇ 10 ⁇ 3
  • l 1000
  • ⁇ 1.72 ⁇ 10 ⁇ 8
  • R L 250
  • c 0.035 ⁇ 10 ⁇ 3
  • y 10.157
  • the replacement time output unit 153 indicates the replacement time by displaying replacement time information, which is information indicating that it is time to replace, when the resistance value Z calculated by the resistance value calculation unit 131 reaches the resistance threshold value Zs . Output.
  • the replacement time output unit 153 may display a text image of “Please replace the cable” on the display unit 55, or output a notification sound from the speaker to notify that it is time to replace the cable. Displays replacement timing information.
  • the resistance value calculation unit 131 calculates initial resistance values of the external load 30 and the cable 4 based on the current output from the cable 4 to the external load 30 and the voltage applied to the external load 30 and the cable 4. Z 0 is calculated, and the resistance initial value Z 0 is stored in the resistance value storage unit 141 (step S113).
  • the information control unit 130 executes the process of step S104, and when a predetermined period of time has elapsed (step S104; Y), the resistance value calculation unit 131 of the information control unit 130 determines that the Based on the current output to the external load 30 and the voltage applied to the external load 30 and the cable 4, the resistance elapsed value Z1 of the external load 30 and the cable 4 is calculated, and the resistance elapsed value Z1 is stored in the resistance value storage section 141. 1 is stored (step S115).
  • the disconnection time calculation unit 132 executes the process of step S106. Note that the specific method for calculating the replacement time and disconnection time in step S106 can be explained in the same manner as in the first embodiment by replacing "external device” with “external load” and "3" with "30". Therefore, detailed explanation will be omitted to avoid redundant explanation.
  • the wire breakage time calculation unit 132 calculates a resistance threshold value that is the value of the resistance value Z at the replacement time (step S116), and the wire breakage time output unit 152 and the replacement time output unit 153 execute the process of step S107. .
  • the information control unit 130 determines whether a predetermined confirmation period, for example, one month, has passed since the resistance value calculation unit 131 calculated the resistance value Z (step S121). If the predetermined confirmation period has not elapsed (step S121; N), the information control unit 130 repeats the process of step S121 until the predetermined confirmation period has elapsed. On the other hand, if the predetermined confirmation period has elapsed (step S121; Y), the resistance value calculation unit 131 of the information control unit 130 calculates the current output from the cable 4 to the external load 30 and the relationship between the external load 30 and the cable 4. The resistance value Z of the external load 30 and the cable 4 is calculated based on the voltage applied to the external load 30 and the cable 4, and the calculated resistance value Z is stored in the resistance value storage unit 141 (step S122).
  • a predetermined confirmation period for example, one month
  • the information control unit 130 determines whether the calculated resistance value Z has reached the resistance threshold (step S123). If the calculated resistance value Z does not reach the resistance threshold value (step S123; N), the information control unit 130 returns to step S121 and repeats the processes of steps 121 to 123 until the calculated resistance value Z reaches the resistance threshold value. . On the other hand, when the calculated resistance value Z reaches the resistance threshold (step S123; Y), the information control unit 130 causes the replacement time output unit 153 to display replacement time information (step S124), and ends the process.
  • the resistance value calculation unit 131 calculates the current output from the cable 4 to the external load 30 and the current applied to the external load 30 and the cable 4.
  • the resistance value Z of the external load 30 and the cable 4 is calculated based on the voltage.
  • the disconnection time calculation unit 132 calculates the disconnection time of the cable 4 based on the resistance initial value Z 0 and the resistance elapsed value Z 1 , and the disconnection time output unit 152 outputs the disconnection time.
  • the calculation related information includes the slope threshold value predetermined by the user. Then, the wire breakage time calculation unit 132 calculates a resistance value at which the value of the slope Z' of the tangent to the resistance value change function Z becomes the slope threshold value as the resistance threshold value, and the replacement time output unit 153 calculates the resistance value calculated by the resistance value calculation unit 131. When the resistance value Z becomes the resistance threshold value, replacement time information is displayed. By doing so, the wire breakage prediction device 200 according to the present embodiment can predict cable breakage more accurately than an analog current output device or a wire breakage prediction device that does not output a replacement time when the calculated resistance value Z reaches the resistance threshold value. It is possible to predict the time of wire breakage and replacement time of 4. In addition, the disconnection prediction device 200 according to the present embodiment has the same effects as the analog current output device 100 according to the first embodiment.
  • the wire breakage time calculation unit 132 calculates the number of years y that has passed, which is the point of contact between the tangent and the resistance value change function Z, where the value of the slope Z' of the tangent to the resistance value change function Z is the slope threshold value.
  • the value of is calculated as the replacement time, it is not limited to this.
  • the wire breakage time calculation unit 132 may calculate the calculated value of the number of years y as the wire breakage time.
  • the wire breakage time calculation unit 132 may calculate a time that is a predetermined period, for example, three months, as the replacement time from the calculated wire breakage time. In this case, the user needs to determine the slope threshold of the tangent to the resistance value change function Z based on the disconnection time rather than the replacement time.
  • the disconnection timing calculation unit 132 calculates the resistance value Z, which is the point of contact between the tangent and the resistance value change function Z, where the value of the slope Z' of the tangent to the resistance value change function Z is the slope threshold value.
  • the value of is calculated as the resistance threshold value depending on the replacement time, the value is not limited to this.
  • the wire breakage time calculation unit 132 may calculate the calculated resistance value Z as a resistance value corresponding to the wire breakage time.
  • the disconnection timing calculation unit 132 may calculate a value obtained by subtracting a predetermined value from the calculated resistance value Z as the resistance threshold value. In this case, the user needs to determine the slope threshold of the tangent to the resistance value change function Z based on the disconnection time rather than the replacement time.
  • the replacement time output unit 153 outputs the replacement time as in the first and second embodiments described above, the user can predict the replacement time by outputting the accurately calculated disconnection time. Therefore, the replacement timing does not need to be output.
  • the replacement time is output when the wire breakage time and the replacement time are calculated, but the replacement time does not have to be output when calculated.
  • the replacement time and the replacement time are output. You can output it when the In this case, the replacement time may be output by displaying the replacement time information as in the second embodiment described above.
  • the analog current output device 100 executes the disconnection timing output process shown in FIG. 7, but the analog current output device 100 executes the disconnection timing output process shown in FIG. Timing output processing may also be executed.
  • the wire breakage prediction device 200 executes the replacement time output process shown in FIG. 9, but the wire breakage prediction device 200 executes the wire breakage time output process shown in FIG. Processing may be executed.
  • the calculation-related information used by the disconnection time calculation unit 132 is information that is first acquired by the calculation-related information acquisition unit 133 and stored in the calculation-related information storage unit 142.
  • the calculation related information may be updatable.
  • the resistance value and slope threshold of the external device 3 or the external load 30 may be updatable.
  • the calculation-related information acquisition unit 133 acquires new calculation-related information, it is necessary to be able to update the calculation-related information stored in the calculation-related information storage unit 142 to new calculation-related information.
  • the main parts that are processed by the analog current output device 100 and the disconnection prediction device 200 which include the control section 51, the main storage section 52, the external storage section 53, the operation section 54, the transmission/reception section 56, and the internal bus 50, are, for example, , a program that executes the above operation is stored and distributed in a recording medium readable by the analog current output device 100 and the disconnection prediction device 200, for example, a flash memory, and the above process is executed by installing the program.
  • the analog current output device 100 and disconnection prediction device 200 may be configured.
  • a program is stored in a storage device of a server device on a communication network such as a LAN or the Internet, and the analog current output device 100 and the disconnection prediction device 200 download the program.
  • Device 200 may be configured.
  • the functions of the analog current output device 100 and the disconnection prediction device 200 are realized by sharing the OS (Operating System) and the application program, or by cooperating with the OS and the application program, only the application program portion is stored on the recording medium. Alternatively, it may be stored in a storage device.
  • OS Operating System
  • the program may be posted on a bulletin board system (BBS) on a communication network and provided via the network. Then, the above process may be executed by starting the program and executing it under the control of the OS in the same way as other application programs.
  • BSS bulletin board system

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

A D/A converter (110) converts an inputted control signal into an analog current signal. An A/D converter (120) converts an analog voltage signal applied to an external instrument (3) and a cable (4) into a digital voltage signal. A resistance value calculation unit (131) calculates resistance values of the external instrument (3) and the cable (4) on the basis of the control signal and the digital voltage signal, and a resistance value storage unit (141) stores at least initial resistance values. A break time calculation unit (132) calculates a time when the cable (4) is likely to break on the basis of the initial resistance values and time-evolving resistance values, and a break time output unit (152) outputs the break time to a user.

Description

アナログ電流出力装置、ＦＡシステム、断線予測装置、断線予測方法及びプログラムAnalog current output device, FA system, wire breakage prediction device, wire breakage prediction method and program
　本開示は、アナログ電流出力装置、ＦＡシステム、断線予測装置、断線予測方法及びプログラムに関する。 The present disclosure relates to an analog current output device, an FA system, a wire breakage prediction device, a wire breakage prediction method, and a program.
　ケーブルの断線の要因として、屈曲、溶断、腐食等が挙げられる。例えば、生産工場において生産工程を制御するＦＡ（Factory Automation）システムを構築した場合、当該ＦＡシステムに用いられる測定装置・制御装置といった装置に用いられるケーブルは、有機ガスが存在する環境において使用されることが想定されるため、腐食による断線のリスクが高くなる。よって、このような場合において、ケーブルの断線を予測する装置、方法が求められている。 Causes of cable breakage include bending, fusing, corrosion, etc. For example, when building an FA (Factory Automation) system to control the production process in a production factory, the cables used for the measuring devices and control devices used in the FA system are used in environments where organic gases are present. This increases the risk of wire breakage due to corrosion. Therefore, in such cases, there is a need for a device and method for predicting cable breakage.
　このような装置の一例として、特許文献１には、測定したケーブルの抵抗値が予め定めた閾値以上となったときにケーブルの断線が進展している状態であると判断する断線予測装置について開示されている。 As an example of such a device, Patent Document 1 discloses a disconnection prediction device that determines that a cable disconnection is progressing when the measured resistance value of the cable exceeds a predetermined threshold value. has been done.
特開２０１４-１６６１２７号公報JP2014-166127A
　特許文献１に記載された断線予測装置は、ケーブルの断線が進展している状態であると判断することができるだけで、ケーブルが実際に断線する時期を予測できない問題がある。 The disconnection prediction device described in Patent Document 1 has a problem in that it can only determine that the cable disconnection is progressing, but cannot predict when the cable will actually disconnect.
　本開示は、上記実情に鑑みてなされたものであり、ケーブルが将来断線する時期を予測することを目的とする。 This disclosure has been made in view of the above circumstances, and aims to predict when a cable will break in the future.
　上記目的を達成するため、本開示に係るアナログ電流出力装置は、制御装置から送信された制御信号を変換したアナログ電流信号を、制御対象としての外部機器にケーブルを介して出力する。アナログ電流出力装置は、入力された制御信号をアナログ電流信号に変換するＤ／Ａ変換器と、外部機器とケーブルとに印加されるアナログ電圧信号をデジタル電圧信号に変換するＡ／Ｄ変換器と、制御信号とデジタル電圧信号とに基づいて、外部機器及びケーブルの抵抗値を算出する抵抗値算出部と、ケーブルが外部機器に最初に接続された時期に算出された抵抗値の初期値である抵抗初期値を少なくとも記憶する抵抗値記憶部と、抵抗初期値と、ケーブルが外部機器に最初に接続されてから予め定めた期間が経過した時期に算出された抵抗値である抵抗経過値とに基づいて、ケーブルが断線する時期である断線時期を算出する断線時期算出部と、断線時期を出力する断線時期出力部と、を備える。 In order to achieve the above object, an analog current output device according to the present disclosure outputs an analog current signal obtained by converting a control signal transmitted from a control device to an external device as a control target via a cable. The analog current output device includes a D/A converter that converts input control signals into analog current signals, and an A/D converter that converts analog voltage signals applied to external equipment and cables into digital voltage signals. , a resistance value calculation unit that calculates the resistance value of the external device and the cable based on the control signal and the digital voltage signal, and an initial value of the resistance value calculated when the cable is first connected to the external device. a resistance value storage unit that stores at least an initial resistance value; and a resistance elapsed value that is a resistance value calculated when a predetermined period of time has elapsed since the cable was first connected to an external device; The present invention includes a wire breakage time calculation unit that calculates a wire breakage time based on the cable breakage time, and a wire breakage time output portion that outputs the wire breakage time.
　本開示によれば、ケーブルが将来断線する時期を予測することができる。 According to the present disclosure, it is possible to predict when the cable will break in the future.
実施の形態１に係るＦＡシステムの全体説明図Overall explanatory diagram of the FA system according to the first embodiment 実施の形態１に係るアナログ電流出力装置の機能構成を示す図A diagram showing a functional configuration of an analog current output device according to Embodiment 1. 実施の形態１に係るアナログ電流出力装置のハードウェア構成を示すブロック図Block diagram showing the hardware configuration of the analog current output device according to Embodiment 1 実施の形態１に係る抵抗値変化関数のグラフ画像の表示例を示す図A diagram illustrating a display example of a graph image of a resistance value change function according to Embodiment 1. 実施の形態１に係る経過年数毎の抵抗値及び接線の傾きの値の表示例を示す図A diagram showing a display example of resistance values and tangent slope values for each elapsed number of years according to Embodiment 1. 実施の形態１に係る入力画面の表示例を示す図A diagram showing a display example of an input screen according to Embodiment 1 実施の形態１に係る断線時期出力処理のフローチャートFlowchart of disconnection time output processing according to Embodiment 1 実施の形態２に係る断線予測装置の機能構成を示す図A diagram showing the functional configuration of a wire breakage prediction device according to Embodiment 2 実施の形態２に係る交換時期出力処理のフローチャートFlowchart of replacement time output processing according to Embodiment 2
　以下、本開示を実施するための形態に係るアナログ電流出力装置、ＦＡシステム、断線予測装置、断線予測方法及びプログラムについて図面を参照して詳細に説明する。なお、図中同一又は相当する部分には同じ符号を付す。 Hereinafter, an analog current output device, an FA system, a disconnection prediction device, a disconnection prediction method, and a program according to embodiments of the present disclosure will be described in detail with reference to the drawings. In addition, the same reference numerals are given to the same or corresponding parts in the figures.
［実施の形態１］
（実施の形態１に係るＦＡシステム１について）
　本開示の実施の形態１に係るアナログ電流出力装置１００は、外部負荷に接続されたケーブルの断線を予測する断線予測装置の一例である。図１に示すように、アナログ電流出力装置１００は、例えば、ＦＡシステム１において、制御装置２から送信された制御信号を変換したアナログ電流信号を外部負荷の一例であって制御対象としての外部機器３にケーブル４を介して出力する。なお、制御信号とは、例えば、電圧値でアナログ電流出力装置１００が出力するアナログ電流信号を制御する信号である。 [Embodiment 1]
(About FA system 1 according to Embodiment 1)
Analog current output device 100 according to Embodiment 1 of the present disclosure is an example of a disconnection prediction device that predicts disconnection of a cable connected to an external load. As shown in FIG. 1, for example, an analog current output device 100 converts a control signal transmitted from a control device 2 into an analog current signal in an FA system 1 to an external device that is an example of an external load and is a control target. 3 via cable 4. Note that the control signal is, for example, a signal that controls the analog current signal output by the analog current output device 100 using a voltage value.
（実施の形態１に係るアナログ電流出力装置１００について）
　図２に示すように、アナログ電流出力装置１００は、制御装置２から受信した制御信号をアナログ電流信号に変換するＤ／Ａ変換器１１０、外部機器３とケーブル４とに印加されるアナログ電圧信号をデジタル電圧信号に変換するＡ／Ｄ変換器１２０を備える。また、アナログ電流出力装置１００は、情報を制御する情報制御部１３０、情報を記憶する情報記憶部１４０、情報を出力する情報出力部１５０を備える。すなわち、アナログ電流出力装置１００は、Ｄ／Ａ変換器１１０、Ａ／Ｄ変換器１２０を備えたコンピュータ装置である。 (About analog current output device 100 according to Embodiment 1)
As shown in FIG. 2, the analog current output device 100 includes a D/A converter 110 that converts a control signal received from the control device 2 into an analog current signal, and an analog voltage signal that is applied to the external device 3 and the cable 4. It includes an A/D converter 120 that converts the voltage into a digital voltage signal. The analog current output device 100 also includes an information control section 130 that controls information, an information storage section 140 that stores information, and an information output section 150 that outputs information. That is, the analog current output device 100 is a computer device including a D/A converter 110 and an A/D converter 120.
　情報制御部１３０は、外部機器３及びケーブル４の抵抗値を算出する抵抗値算出部１３１、ケーブル４が断線する時期である断線時期を算出する断線時期算出部１３２、断線時期の算出に関する情報である算出関連情報を取得する算出関連情報取得部１３３を含む。また、情報記憶部１４０は、外部機器３及びケーブル４の抵抗値を記憶する抵抗値記憶部１４１、算出関連情報を記憶する算出関連情報記憶部１４２を含む。また、情報出力部１５０は、アナログ電流出力装置１００のユーザが算出関連情報を入力する後述する入力画面１６０を表示する入力画面表示部１５１、断線時期を出力する断線時期出力部１５２、後述する交換時期を出力する交換時期出力部１５３を含む。 The information control unit 130 includes a resistance value calculation unit 131 that calculates the resistance values of the external device 3 and the cable 4, a disconnection time calculation unit 132 that calculates the disconnection time when the cable 4 is disconnected, and information regarding calculation of the disconnection time. It includes a calculation-related information acquisition unit 133 that acquires certain calculation-related information. The information storage unit 140 also includes a resistance value storage unit 141 that stores resistance values of the external device 3 and the cable 4, and a calculation-related information storage unit 142 that stores calculation-related information. The information output unit 150 also includes an input screen display unit 151 that displays an input screen 160 (described later) on which the user of the analog current output device 100 inputs calculation-related information, a disconnection time output unit 152 that outputs the disconnection time, and a replacement unit (described later). It includes a replacement time output unit 153 that outputs the time.
（実施の形態１に係るアナログ電流出力装置１００のハードウェア構成について）
　図３に示すように、アナログ電流出力装置１００は、例えば、制御プログラム５９に従って処理を実行する制御部５１を備える。制御部５１は、ＣＰＵ（Central Processing Unit）を備える。制御部５１は、制御プログラム５９に従って、図２に示す情報制御部１３０として機能する。 (About the hardware configuration of analog current output device 100 according to Embodiment 1)
As shown in FIG. 3, the analog current output device 100 includes a control section 51 that executes processing according to a control program 59, for example. The control unit 51 includes a CPU (Central Processing Unit). The control unit 51 functions as the information control unit 130 shown in FIG. 2 according to the control program 59.
　図３に戻り、アナログ電流出力装置１００は、制御プログラム５９をロードし、制御部５１の作業領域として用いられる主記憶部５２を備える。主記憶部５２は、ＲＡＭ（Random Access Memory）を備える。 Returning to FIG. 3, the analog current output device 100 includes a main storage section 52 that loads a control program 59 and is used as a work area for the control section 51. The main storage unit 52 includes a RAM (Random Access Memory).
　アナログ電流出力装置１００は、制御プログラム５９を予め記憶する外部記憶部５３を備える。外部記憶部５３は、制御部５１の指示に従って、このプログラムが記憶するデータを制御部５１に供給し、制御部５１から供給されたデータを記憶する。外部記憶部５３は、ＲＯＭ（Read Only Memory）、フラッシュメモリ、ＨＤＤ（Hard Disk Drive）、ＳＳＤ（Solid State Drive）等の記録媒体を備える。外部記憶部５３は、図２に示す情報記憶部１４０として機能する。 The analog current output device 100 includes an external storage section 53 that stores a control program 59 in advance. The external storage section 53 supplies the data stored by this program to the control section 51 according to instructions from the control section 51, and stores the data supplied from the control section 51. The external storage unit 53 includes a recording medium such as a ROM (Read Only Memory), a flash memory, an HDD (Hard Disk Drive), and an SSD (Solid State Drive). The external storage section 53 functions as the information storage section 140 shown in FIG.
　図３に戻り、アナログ電流出力装置１００は、ユーザに操作される操作部５４を備える。操作部５４を介して、入力された情報が制御部５１に供給される。操作部５４は、キーボード、マウス、タッチパネル等の情報入力部品を備える。 Returning to FIG. 3, the analog current output device 100 includes an operation section 54 operated by the user. The input information is supplied to the control section 51 via the operation section 54 . The operation unit 54 includes information input components such as a keyboard, a mouse, and a touch panel.
　また、アナログ電流出力装置１００は、操作部５４を介して入力された情報及び制御部５１が出力した情報を表示する表示部５５を備える。表示部５５は、ＬＣＤ（Liquid Crystal Display）、ＯＬＥＤ（Organic Light Emitting Diode）ディスプレイ等の表示装置を備える。表示部５５は、図２に示す情報出力部１５０として機能する。 The analog current output device 100 also includes a display section 55 that displays information input via the operation section 54 and information output from the control section 51. The display unit 55 includes a display device such as an LCD (Liquid Crystal Display) or an OLED (Organic Light Emitting Diode) display. The display section 55 functions as the information output section 150 shown in FIG.
　また、アナログ電流出力装置１００は、情報を送受信する送受信部５６を備える。送受信部５６は、ネットワークに接続する通信網終端装置、無線通信装置等の情報通信部品を備える。 Further, the analog current output device 100 includes a transmitting/receiving section 56 that transmits and receives information. The transmitting/receiving unit 56 includes information communication components such as a communication network termination device and a wireless communication device connected to the network.
　図３に戻り、アナログ電流出力装置１００では、主記憶部５２、外部記憶部５３、操作部５４、表示部５５及び送受信部５６はいずれも内部バス５０を介して制御部５１に接続されている。 Returning to FIG. 3, in the analog current output device 100, the main storage section 52, external storage section 53, operation section 54, display section 55, and transmission/reception section 56 are all connected to the control section 51 via the internal bus 50. .
　アナログ電流出力装置１００は、制御部５１が主記憶部５２、外部記憶部５３、操作部５４、表示部５５及び送受信部５６を資源として用いることによって、図２に示す情報制御部１３０、情報記憶部１４０、情報出力部１５０の機能を実現する。例えば、アナログ電流出力装置１００は、情報制御部１３０の抵抗値算出部１３１が行う抵抗値算出ステップ、断線時期算出部１３２が行う断線時期算出ステップ、算出関連情報取得部１３３が行う算出関連情報取得ステップを実行する。また、例えば、アナログ電流出力装置１００は、情報記憶部１４０の抵抗値記憶部１４１が行う抵抗値記憶ステップ、算出関連情報記憶部１４２が行う算出関連情報記憶ステップを実行する。また、例えば、アナログ電流出力装置１００は、情報出力部１５０の入力画面表示部１５１が行う入力画面表示ステップ、断線時期出力部１５２が行う断線時期出力ステップ、交換時期出力部１５３が行う交換時期出力ステップを実行する。 In the analog current output device 100, the information control section 130 and information storage shown in FIG. The functions of the section 140 and the information output section 150 are realized. For example, the analog current output device 100 includes a resistance value calculation step performed by the resistance value calculation unit 131 of the information control unit 130, a disconnection time calculation step performed by the disconnection time calculation unit 132, and a calculation related information acquisition performed by the calculation related information acquisition unit 133. Execute the steps. Further, for example, the analog current output device 100 executes a resistance value storage step performed by the resistance value storage unit 141 of the information storage unit 140 and a calculation related information storage step performed by the calculation related information storage unit 142. For example, the analog current output device 100 also includes an input screen display step performed by the input screen display section 151 of the information output section 150, a disconnection time output step performed by the disconnection time output section 152, and a replacement time output step performed by the replacement time output section 153. Execute the steps.
（実施の形態１に係るアナログ電流出力装置１００の機能構成の詳細について）
　図２に戻り、Ｄ／Ａ変換器１１０は、情報制御部１３０から入力された制御信号をデジタルアナログ変換してアナログ電流信号をケーブル４から外部機器３に出力する。 (Details of functional configuration of analog current output device 100 according to Embodiment 1)
Returning to FIG. 2, the D/A converter 110 converts the control signal input from the information control unit 130 into digital-to-analog, and outputs an analog current signal from the cable 4 to the external device 3.
　Ａ／Ｄ変換器１２０は、外部機器３とケーブル４とに印加される電圧を測定することで生成されるアナログ電圧信号をアナログデジタル変換してデジタル電圧信号を情報制御部１３０に出力する。 The A/D converter 120 performs analog-to-digital conversion on an analog voltage signal generated by measuring the voltage applied to the external device 3 and the cable 4, and outputs the digital voltage signal to the information control unit 130.
　抵抗値算出部１３１は、Ｄ／Ａ変換器１１０に入力される制御信号とＡ／Ｄ変換器１２０から出力されたデジタル電圧信号とに基づいて、外部機器３及びケーブル４の抵抗値を算出する。なお、本願において、外部機器３及びケーブル４の抵抗値とは、外部機器３の抵抗値とケーブル４の抵抗値との合計値をいう。抵抗値算出部１３１は、オームの法則を用いて外部機器３及びケーブル４の抵抗値を算出する。具体的には、ケーブル４から外部機器３に出力される電流の値をＩ［Ａ］、外部機器３とケーブル４とに印加される電圧の値をＶ［Ｖ］、外部機器３及びケーブル４の抵抗値をＺ［Ω］とした場合、抵抗値算出部１３１は、Ｚ＝Ｖ／Ｉとの数式を用いて抵抗値Ｚを算出する。 The resistance value calculation unit 131 calculates the resistance values of the external device 3 and the cable 4 based on the control signal input to the D/A converter 110 and the digital voltage signal output from the A/D converter 120. . In this application, the resistance value of the external device 3 and the cable 4 refers to the total value of the resistance value of the external device 3 and the resistance value of the cable 4. The resistance value calculation unit 131 calculates the resistance values of the external device 3 and the cable 4 using Ohm's law. Specifically, the value of the current output from the cable 4 to the external device 3 is I [A], the value of the voltage applied to the external device 3 and the cable 4 is V [V], and the value of the voltage applied to the external device 3 and the cable 4 is When the resistance value of is Z [Ω], the resistance value calculation unit 131 calculates the resistance value Z using the formula Z=V/I.
　抵抗値算出部１３１は、ケーブル４が外部機器３に最初に接続された時期に外部機器３及びケーブル４の抵抗値の初期値である抵抗初期値を算出する。また、抵抗値算出部１３１は、ケーブル４が外部機器３に最初に接続されてから予め定めた期間、例えば、１年間が経過した時期の外部機器３及びケーブル４の抵抗値である抵抗経過値を算出する。以下、抵抗初期値をＺ０、抵抗経過値をＺ１として説明する。なお、各抵抗値Ｚ０、Ｚ１は、例えば、Ｚ０＝２７０．８９［Ω］、Ｚ１＝２７４．０６［Ω］である。 The resistance value calculation unit 131 calculates an initial resistance value that is an initial value of the resistance values of the external device 3 and the cable 4 when the cable 4 is first connected to the external device 3. The resistance value calculation unit 131 also calculates a resistance elapsed value which is the resistance value of the external device 3 and the cable 4 after a predetermined period of time, for example, one year has elapsed since the cable 4 was first connected to the external device 3. Calculate. The following description will be made assuming that the initial resistance value is Z 0 and the resistance elapsed value is Z 1 . Note that the respective resistance values Z 0 and Z 1 are, for example, Z 0 =270.89 [Ω] and Z 1 =274.06 [Ω].
　算出関連情報取得部１３３は、算出関連情報としてケーブル４の半径の初期値である半径初期値、長さ及び抵抗率、ならびに、外部機器３の抵抗値、ならびに、ユーザが予め定めた後述する抵抗値変化関数の接線の傾きの閾値である傾き閾値を含む情報を取得する。算出関連情報取得部１３３は、ユーザによる操作部５４を用いた入力によって後述する入力画面１６０に表示された算出関連情報を取得する。以下、ケーブル４の半径初期値をｒ０［ｍｍ］、長さをｌ［ｍ］、抵抗率をρ［Ω／ｍ］、外部機器３の抵抗値をＲＬ［Ω］として説明する。なお、算出関連情報は、例えば、ｒ０＝０．５１２［ｍｍ］、ｌ＝１０００［ｍ］、ρ＝１．７２×１０－８［Ω／ｍ］、ＲＬ＝２５０［Ω］を含む情報である。 The calculation-related information acquisition unit 133 obtains, as calculation-related information, the initial radius value, length and resistivity, which is the initial value of the radius of the cable 4, the resistance value of the external device 3, and the resistance predetermined by the user, which will be described later. Information including a slope threshold, which is a threshold for the slope of the tangent to the value change function, is acquired. The calculation-related information acquisition unit 133 acquires calculation-related information displayed on an input screen 160, which will be described later, through input by the user using the operation unit 54. The following description will be made assuming that the initial value of the radius of the cable 4 is r 0 [mm], the length is l [m], the resistivity is ρ [Ω/m], and the resistance value of the external device 3 is R L [Ω]. Note that the calculation-related information includes, for example, r 0 =0.512 [mm], l = 1000 [m], ρ = 1.72×10 −8 [Ω/m], and R L =250 [Ω]. It is information.
　断線時期算出部１３２は、抵抗初期値Ｚ０と抵抗経過値Ｚ１と算出関連情報とに基づいて断線時期を算出する。断線時期算出部１３２は、情報記憶部１４０が記憶している抵抗初期値Ｚ０、抵抗経過値Ｚ１、算出関連情報に含まれるケーブル４の半径初期値ｒ０、長さｌ、抵抗率ρ、外部機器３の抵抗値ＲＬを用いて時間の経過と抵抗値の変化との対応関係を示す関数である抵抗値変化関数を特定する。 The wire breakage time calculation unit 132 calculates the wire breakage time based on the resistance initial value Z 0 , the resistance elapsed value Z 1 , and the calculation related information. The disconnection time calculation unit 132 calculates the resistance initial value Z 0 , the resistance elapsed value Z 1 , the initial radius value r 0 , the length l, and the resistivity ρ of the cable 4 included in the calculation-related information stored in the information storage unit 140. , a resistance value change function, which is a function indicating the correspondence between the passage of time and a change in resistance value, is specified using the resistance value RL of the external device 3.
　具体的には、先ず、ケーブル４の半径をｒ［ｍｍ］とした場合、外部機器３及びケーブル４の抵抗値Ｚは、以下の数１に示す数式によって算出される。 Specifically, first, when the radius of the cable 4 is r [mm], the resistance value Z of the external device 3 and the cable 4 is calculated by the formula shown in Equation 1 below.
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　例えば、上述した数１に示す数式に、ｒ＝ｒ０＝０．５１２×１０－３［ｍ］、ｌ＝１０００、ρ＝１．７２×１０－８、ＺＬ＝２５０を代入すると、外部機器３及びケーブル４の抵抗値Ｚは、Ｚ＝（１．７２×１０－８×１０００）／｛３．１４×（０．５１２×１０－３）２｝＋２５０≒２７０．８９［Ω］＝Ｚ０である。 For example, by substituting r=r 0 =0.512×10 −3 [m], l=1000, ρ=1.72×10 −8 , and Z L =250 into the formula shown in Equation 1 above, the external The resistance value Z of the device 3 and the cable 4 is Z=(1.72×10 −8 ×1000)/{3.14×(0.512×10 −3 ) 2 }+250≒270.89 [Ω]= Z is 0 .
　次に、予め定めた期間が経過することによる外部機器３及びケーブル４の抵抗値の増加値である抵抗増加値をＺｄ［Ω／期間］とした場合、抵抗増加値Ｚｄは、Ｚｄ＝Ｚ１－Ｚ０によって算出される。例えば、抵抗増加値Ｚｄは、Ｚｄ＝２７４．０６－２７０．８９＝３．１７［Ω］である。このため、予め定めた期間が経過した時期のケーブル４の半径の経過値である半径経過値をｒ１［ｍｍ］とした場合、抵抗増加値Ｚｄは、上述した数１及びＺｄ＝Ｚ１－Ｚ０に基づく以下の数２に示す数式によって示される。 Next, if the resistance increase value that is the increase in the resistance value of the external device 3 and the cable 4 due to the passage of a predetermined period is Z d [Ω/period], the resistance increase value Z d is Z d It is calculated by =Z 1 -Z 0 . For example, the resistance increase value Z d is Z d =274.06-270.89=3.17 [Ω]. Therefore, if the radius elapsed value, which is the elapsed value of the radius of the cable 4 at the time when a predetermined period has elapsed, is r 1 [mm], the resistance increase value Z d is determined by the above-mentioned equation 1 and Z d = Z This is expressed by the following equation 2 based on 1 -Z 0 .
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
　よって、ケーブル４の半径経過値ｒ１は、上述した数２に示す数式に基づく以下の数３に示す数式によって算出される。 Therefore, the radius elapsed value r1 of the cable 4 is calculated by the following equation 3 based on the equation 2 described above.
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000003
　例えば、上述した数３に示す数式に、ｒ０＝０．５１２×１０－３［ｍ］、ｌ＝１０００、ρ＝１．７２×１０－８、Ｚｄ＝３．１７を代入すると、ケーブル４の半径経過値ｒ１は、ｒ１＝［｛１．７２×１０－８×１０００×（０．５１２×１０－３）２｝／｛１．７２×１０－８×１０００＋３．１７×３．１４×（０．５１２×１０－３）２｝］１／２≒０．４７７×１０－３［ｍ］＝０．４７７［ｍｍ］である。 For example, by substituting r 0 =0.512×10 −3 [m], l=1000, ρ=1.72×10 −8 , and Z d =3.17 into the formula shown in Equation 3 above, the cable The radius elapsed value r 1 of 4 is r 1 = [{1.72×10 −8 ×1000×(0.512×10 −3 ) 2 }/{1.72×10 −8 ×1000+3.17×3 .14×(0.512×10 −3 ) 2 }] 1/2 ≈0.477×10 −3 [m] = 0.477 [mm].
　次に、予め定めた期間が経過することによるケーブル４の半径の減少値である半径減少値をｃ［ｍｍ／期間］とした場合、半径減少値ｃは、ｃ＝ｒ０－ｒ１によって算出される。なお、半径減少値ｃは、予め定めた期間における半径の減少速度と近似するともいえる。例えば、予め定めた期間が１年間であり、半径の減少の原因が上述したＦＡシステム１が設けられた生産工場に存在する有機ガスによる腐食である場合、半径減少値ｃは、１年毎の腐食速度［ｍｍ／年］と近似するともいえる。例えば、１年毎の腐食速度ｃは、ｃ＝０．５１２－０．４７７≒０．０３５［ｍｍ／年］＝０．０３５×１０－３［ｍ／年］である。 Next, when the radius reduction value, which is the reduction value of the radius of the cable 4 due to the passage of a predetermined period, is c [mm/period], the radius reduction value c is calculated by c=r 0 - r 1 . be done. Note that it can be said that the radius decrease value c approximates the rate of radius decrease over a predetermined period. For example, if the predetermined period is one year and the cause of radius reduction is corrosion due to organic gas present in the production factory where FA system 1 is installed, the radius reduction value c will be calculated as follows: It can be said that it is approximated to the corrosion rate [mm/year]. For example, the annual corrosion rate c is c=0.512-0.477≈0.035 [mm/year]=0.035×10 −3 [m/year].
　ここで、ケーブル４が外部機器３に最初に接続されてから経過した年数であるケーブル４の経過年数をｙ［年］とした場合、経過年数ｙが経過した時期のケーブル４の半径ｒは、ｒ＝ｒ０－ｃｙによって算出される。例えば、２年が経過した時期のケーブル４の半径ｒは、ｒ＝０．５１２－０．０３５×２≒０．４４２［ｍｍ］であると推測される。このため、外部機器３及びケーブル４の抵抗値Ｚは、上述した数１及びｒ＝ｒ０－ｃｙに基づく以下の数４に示す数式によって算出される。 Here, if the number of years that have passed since the cable 4 was first connected to the external device 3 is y [years], then the radius r of the cable 4 when the number of years y has passed is: It is calculated by r=r 0 -cy. For example, the radius r of the cable 4 after two years is estimated to be r=0.512-0.035×2≈0.442 [mm]. Therefore, the resistance value Z of the external device 3 and the cable 4 is calculated by the following formula 4 based on the above-mentioned formula 1 and r=r 0 -cy.
Figure JPOXMLDOC01-appb-M000004
Figure JPOXMLDOC01-appb-M000004
　ここで、上述した数４に示す数式は、図４に示すように、経過年数ｙの経過と抵抗値Ｚの変化との対応関係を示す関数である抵抗値変化関数Ｚの数式であると言い換えることができる。また、上述した数４に示す抵抗値変化関数Ｚの数式を経過年数ｙについて微分した数式をＺ′とした場合、微分した数式Ｚ′［Ω／年］は、以下の数５に示す数式となる。なお、上述した数５に示す微分した数式Ｚ′の値は、上述した数４に示す抵抗値変化関数Ｚの経過年数ｙにおける接線の傾きと言い換えることができる。 Here, the formula shown in Equation 4 above can be rephrased as a formula for a resistance value change function Z, which is a function indicating the correspondence between the elapsed number of years y and the change in the resistance value Z, as shown in FIG. be able to. Furthermore, if Z' is a formula obtained by differentiating the formula of the resistance value change function Z shown in Equation 4 above with respect to the number of elapsed years y, then the differentiated formula Z' [Ω/year] can be expressed as the formula shown in Equation 5 below. Become. Note that the value of the differentiated mathematical expression Z' shown in the above-mentioned Equation 5 can be rephrased as the slope of the tangent to the resistance value change function Z shown in the above-mentioned Equation 4 with respect to the elapsed number of years y.
Figure JPOXMLDOC01-appb-M000005
Figure JPOXMLDOC01-appb-M000005
　例えば、上述した数４に示す数式に、ｒ０＝０．５１２×１０－３［ｍ］、ｌ＝１０００、ρ＝１．７２×１０－８、ＲＬ＝２５０、ｃ＝０．０３５×１０－３［ｍ／年］を代入すると、２年が経過した時期の外部機器３及びケーブル４の抵抗値Ｚは、Ｚ＝（１．７２×１０－８×１０００）／｛３．１４×（０．５１２×１０－３－０．０３５×１０－３×２）２｝＋２５０≒２７８．０２［Ω］である。また、例えば、上述した数５に示す数式に、上述した値を代入すると、２年が経過した時期の接線の傾きＺ′は、Ｚ′＝（２×０．０３５×１０－３×１．７２×１０－８×１０００）／｛３．１４×（０．５１２×１０－３－０．０３５×１０－３×２）３｝≒４．４４［Ω／年］である。 For example, in the formula shown in Equation 4 above, r 0 =0.512×10 −3 [m], l=1000, ρ=1.72×10 −8 , R L =250, c=0.035× By substituting 10 -3 [m/year], the resistance value Z of the external device 3 and cable 4 after two years is Z = (1.72 x 10 -8 x 1000) / {3.14 x (0.512×10 −3 −0.035×10 −3 ×2) 2 }+250≒278.02 [Ω]. Furthermore, for example, by substituting the above-mentioned value into the formula shown in Equation 5 above, the slope Z' of the tangent line after two years is Z'=(2×0.035×10 −3 ×1. 72×10 −8 ×1000)/{3.14×(0.512×10 −3 −0.035×10 −3 ×2) 3 }≒4.44 [Ω/year].
　なお、図５に示す値は、上述した数４及び数５に示す数式から算出した経過年数ｙ［年］が０年から１２年までの抵抗値Ｚ及び接線の傾きＺ′の値である。例えば、１０年が経過した時期の抵抗値Ｚ及び接線の傾きＺ′は、Ｚ＝４５８．６２［Ω］、Ｚ′＝９０．１４［Ω／年］である一方、１１年が経過した時期の抵抗値Ｚ及び接線の傾きＺ′は、Ｚ＝５８９．４５［Ω］、Ｚ′＝１８７．１０［Ω／年］である。このため、抵抗値Ｚは、１０年が経過してから１１年が経過するまでの間に、５８９．４５－４５８．６２＝１３０．８３［Ω］、すなわち、１３０［Ω］以上も急激に大きくなることが分かる。 Note that the values shown in FIG. 5 are the values of the resistance value Z and the slope Z' of the tangent line when the number of elapsed years y [years] is 0 to 12 years, calculated from the formulas shown in Equations 4 and 5 above. For example, the resistance value Z and the slope Z' of the tangent line when 10 years have passed are Z = 458.62 [Ω] and Z' = 90.14 [Ω/year], while when 11 years have passed The resistance value Z and the slope Z' of the tangent are Z=589.45 [Ω] and Z'=187.10 [Ω/year]. Therefore, the resistance value Z suddenly increases by 589.45-458.62=130.83 [Ω], that is, more than 130 [Ω] between 10 years and 11 years. I know it's going to get bigger.
　この結果、断線時期算出部１３２は、抵抗値変化関数Ｚの接線の傾きＺ′の値に基づいて、断線時期の予測値を算出することができる。例えば、断線時期算出部１３２は、抵抗値変化関数Ｚの接線の傾きＺ′の値が急激に大きくなる経過年数ｙを断線時期として算出することができる。なお、経過年数ｙは、上述した数５に示す数式に基づく以下の数６に示す数式によって算出される。 As a result, the wire breakage time calculation unit 132 can calculate the predicted value of the wire breakage time based on the value of the slope Z' of the tangent to the resistance value change function Z. For example, the wire breakage time calculation unit 132 can calculate the elapsed number of years y at which the value of the slope Z' of the tangent to the resistance value change function Z suddenly increases as the wire breakage time. Note that the number of years y is calculated by the following formula shown in Equation 6 based on the above-mentioned Equation 5.
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000006
　このため、断線時期算出部１３２は、図４に示すように、上述した数６に示す数式に基づいて、抵抗値変化関数Ｚの接線の傾きＺ′の値が算出関連情報に含まれる傾き閾値となる接線を特定し、当該接線と抵抗値変化関数Ｚとの接点である経過年数ｙの値と抵抗値Ｚの値とを算出する。このため、傾き閾値は、これ以上大きくなるとケーブル４の断線が発生する可能性が十分あり、ケーブル４を交換する必要があるとユーザが認識している抵抗値変化関数Ｚの接線の傾きＺ′の値が当該ユーザによって予め定められている。例えば、ユーザは、傾き閾値をＺ′とした場合、Ｚ′＝１００［Ω／年］と定めることができる。そして、断線時期算出部１３２は、算出した経過年数ｙを交換時期として算出するとともに、当該交換時期から予め定めた期間、例えば、３ヶ月間が経過した時期を断線時期として算出する。 Therefore, as shown in FIG. 4, the disconnection timing calculation unit 132 calculates the value of the slope Z' of the tangent of the resistance value change function Z to the slope threshold value included in the calculation related information, based on the formula shown in Equation 6 above. A tangent line is specified, and the value of the number of years y and the value of the resistance value Z, which are the points of contact between the tangent line and the resistance value change function Z, are calculated. For this reason, the slope threshold value is the slope Z' of the tangent to the resistance value change function Z at which the user recognizes that there is a strong possibility that the cable 4 will break and the cable 4 needs to be replaced if it becomes larger than this value. The value of is predetermined by the user. For example, if the slope threshold value is Z', the user can set Z'=100 [Ω/year]. Then, the wire breakage time calculation unit 132 calculates the calculated number of years y as the replacement time, and also calculates the time when a predetermined period, for example, three months has elapsed from the replacement time, as the wire breakage time.
　例えば、上述した数６に示す数式に、ｒ０＝０．５１２×１０－３、ｌ＝１０００、ρ＝１．７２×１０－８、ｃ＝０．０３５×１０－３、Ｚ′＝１００を代入すると、交換時期ｙは、ｙ＝｛０．５１２×１０－３－（２×０．０３５×１０－３×１．７２×１０－８×１０００）／３．１４×１００｝１／３／０．０３５×１０－３≒１０．１５７［年］である。また、断線時期は、例えば、１０．１５７＋０．２５＝１０．４０７［年］である。 For example, in the formula shown in Equation 6 above, r 0 =0.512×10 −3 , l=1000, ρ=1.72×10 −8 , c=0.035×10 −3 , Z′=100 Substituting , the replacement time y is y={0.512×10 −3 −(2×0.035×10 −3 ×1.72×10 −8 ×1000)/3.14×100} 1/ 3 /0.035×10 −3 ≒10.157 [year]. Further, the disconnection time is, for example, 10.157+0.25=10.407 [year].
　抵抗値記憶部１４１は、抵抗値算出部１３１が抵抗値Ｚを算出した場合、算出した抵抗値Ｚを記憶する。よって、抵抗値記憶部１４１は、少なくとも抵抗初期値Ｚ０、抵抗経過値Ｚ１を記憶する。なお、本実施の形態では、抵抗値算出部１３１は、抵抗初期値Ｚ０、抵抗経過値Ｚ１を算出したとき、抵抗値記憶部１４１に抵抗初期値Ｚ０、抵抗経過値Ｚ１を記憶させる。 When the resistance value calculation unit 131 calculates the resistance value Z, the resistance value storage unit 141 stores the calculated resistance value Z. Therefore, the resistance value storage section 141 stores at least the resistance initial value Z 0 and the resistance elapsed value Z 1 . In this embodiment, when the resistance value calculation unit 131 calculates the resistance initial value Z 0 and the resistance elapsed value Z 1 , the resistance value calculation unit 131 stores the resistance initial value Z 0 and the resistance elapsed value Z 1 in the resistance value storage unit 141. let
　算出関連情報記憶部１４２は、算出関連情報取得部１３３が算出関連情報を取得した場合、取得した算出関連情報を記憶する。なお、本実施の形態では、算出関連情報取得部１３３は、算出関連情報を取得したとき、算出関連情報記憶部１４２に算出関連情報を記憶させる。 When the calculation-related information acquisition unit 133 acquires calculation-related information, the calculation-related information storage unit 142 stores the acquired calculation-related information. Note that in this embodiment, when the calculation-related information acquisition unit 133 acquires the calculation-related information, the calculation-related information storage unit 142 stores the calculation-related information.
　入力画面表示部１５１は、ユーザによる操作部５４を用いた入力によって算出関連情報が入力される図６に示す入力画面１６０を表示部５５に表示する。図６に示すように、入力画面１６０は、上から順に、ユーザによる操作部５４を用いた入力によって、ケーブル４の半径初期値ｒ０が入力される半径初期値入力欄１６１、ケーブル４の長さｌが入力される長さ入力欄１６２、ケーブル４の抵抗率ρが入力される抵抗率入力欄１６３を含む。また、入力画面１６０は、抵抗率入力欄１６３の下方に設けられ、ユーザによる操作部５４を用いた入力によって外部機器３の抵抗値ＲＬが入力される外部機器抵抗値入力欄１６４を含む。また、入力画面１６０は、外部機器抵抗値入力欄１６４の下方に設けられ、ユーザによる操作部５４を用いた入力によってユーザが予め定めた傾き閾値が入力される傾き閾値入力欄１６５を含む。 The input screen display unit 151 displays on the display unit 55 an input screen 160 shown in FIG. 6 in which calculation-related information is input by the user using the operation unit 54. As shown in FIG. 6, the input screen 160 includes, in order from the top, a radius initial value input field 161 in which the initial radius value r0 of the cable 4 is inputted by the user using the operation unit 54; It includes a length input field 162 in which the length 1 is input, and a resistivity input field 163 in which the resistivity ρ of the cable 4 is input. Further, the input screen 160 includes an external device resistance value input field 164 provided below the resistivity input field 163, into which the resistance value RL of the external device 3 is input by the user using the operation unit 54. In addition, the input screen 160 includes a slope threshold input field 165 provided below the external device resistance value input field 164, into which a slope threshold predetermined by the user is inputted by the user using the operation unit 54.
　断線時期出力部１５２は、断線時期算出部１３２が算出した断線時期を表示部５５に表示することで、ユーザに対して断線時期を出力する。また、交換時期出力部１５３は、断線時期算出部１３２が算出した交換時期を表示部５５に表示することで、ユーザに対して交換時期を出力する。例えば、断線時期出力部１５２及び交換時期出力部１５３は、図４に示す抵抗値変化関数Ｚのグラフ画像を表示し、当該グラフ画像において断線時期と交換時期とを示す画像を表示することで、断線時期と交換時期とを表示する。 The wire breakage time output unit 152 outputs the wire breakage time to the user by displaying the wire breakage time calculated by the wire breakage time calculation unit 132 on the display unit 55. Furthermore, the replacement time output unit 153 displays the replacement time calculated by the disconnection time calculation unit 132 on the display unit 55, thereby outputting the replacement time to the user. For example, the wire breakage time output section 152 and the replacement time output section 153 display a graph image of the resistance value change function Z shown in FIG. 4, and display an image indicating the wire breakage time and the replacement time in the graph image. Displays the time of wire breakage and the time of replacement.
（実施の形態１に係る断線時期出力処理について）
　次に、フローチャートを用いてアナログ電流出力装置１００が断線時期を算出、出力する動作について説明する。アナログ電流出力装置１００は、ケーブル４が外部機器３に最初に接続されてから電源をオンにすると、図７に示す断線時期出力処理の実行を開始する。先ず、入力画面表示部１５１は、図６に示す入力画面１６０を表示する（ステップＳ１０１）。次に、算出関連情報取得部１３３は、ユーザによる操作部５４を用いた入力によって入力画面１６０に表示された算出関連情報を取得し、算出関連情報記憶部１４２に算出関連情報を記憶させる（ステップＳ１０２）。 (About disconnection time output processing according to Embodiment 1)
Next, an operation in which the analog current output device 100 calculates and outputs the disconnection timing will be described using a flowchart. When the power is turned on after the cable 4 is first connected to the external device 3, the analog current output device 100 starts executing the disconnection timing output process shown in FIG. First, the input screen display section 151 displays the input screen 160 shown in FIG. 6 (step S101). Next, the calculation-related information acquisition unit 133 acquires the calculation-related information displayed on the input screen 160 by the user's input using the operation unit 54, and stores the calculation-related information in the calculation-related information storage unit 142 (step S102).
　次に、抵抗値算出部１３１は、Ｄ／Ａ変換器１１０に入力される制御信号とＡ／Ｄ変換器１２０から出力されたデジタル電圧信号とに基づいて、外部機器３及びケーブル４の抵抗初期値Ｚ０を算出し、抵抗値記憶部１４１に抵抗初期値Ｚ０を記憶させる（ステップＳ１０３）。次に、情報制御部１３０は、抵抗値記憶部１４１が抵抗初期値Ｚ０を記憶してから予め定めた期間、例えば、１年間が経過したか否かを判定する（ステップＳ１０４）。情報制御部１３０は、予め定めた期間が経過していない場合（ステップＳ１０４；Ｎ）、予め定めた期間が経過するまでステップＳ１０４の処理を繰り返す。一方、情報制御部１３０の抵抗値算出部１３１は、予め定めた期間が経過した場合（ステップＳ１０４；Ｙ）、Ｄ／Ａ変換器１１０に入力される制御信号とＡ／Ｄ変換器１２０から出力されたデジタル電圧信号とに基づいて、外部機器３及びケーブル４の抵抗経過値Ｚ１を算出し、抵抗値記憶部１４１に抵抗経過値Ｚ１を記憶させる（ステップＳ１０５）。 Next, the resistance value calculation unit 131 calculates the initial resistance of the external device 3 and the cable 4 based on the control signal input to the D/A converter 110 and the digital voltage signal output from the A/D converter 120. A value Z 0 is calculated, and the resistance initial value Z 0 is stored in the resistance value storage unit 141 (step S103). Next, the information control unit 130 determines whether a predetermined period of time, for example, one year, has passed since the resistance value storage unit 141 stored the initial resistance value Z0 (step S104). If the predetermined period has not elapsed (step S104; N), the information control unit 130 repeats the process of step S104 until the predetermined period has elapsed. On the other hand, when a predetermined period has elapsed (step S104; Y), the resistance value calculation unit 131 of the information control unit 130 outputs a control signal input to the D/A converter 110 and an output from the A/D converter 120. The resistance elapsed value Z1 of the external device 3 and the cable 4 is calculated based on the digital voltage signal, and the resistance elapsed value Z1 is stored in the resistance value storage section 141 (step S105).
　次に、断線時期算出部１３２は、抵抗値記憶部１４１が記憶している抵抗初期値Ｚ０及び抵抗経過値Ｚ１と、算出関連情報とに基づいて断線時期及び交換時期を算出する（ステップＳ１０６）。具体的には、断線時期算出部１３２は、抵抗初期値Ｚ０、抵抗経過値Ｚ１、算出関連情報に含まれるケーブル４の半径初期値ｒ０、長さｌ、抵抗率ρ、外部機器３の抵抗値ＲＬを用いて上述した数４に示す抵抗値変化関数Ｚを特定する。また、断線時期算出部１３２は、上述した数６に示す数式に基づいて、抵抗値変化関数Ｚの接線の傾きＺ′の値が算出関連情報に含まれる傾き閾値となる接線を特定し、当該接線と抵抗値変化関数Ｚとの接点である経過年数ｙの値と抵抗値Ｚの値とを算出する。そして、断線時期算出部１３２は、算出した経過年数ｙを交換時期として算出するとともに、当該交換時期から予め定めた期間が経過した時期を断線時期として算出する。 Next, the wire breakage time calculation unit 132 calculates the wire breakage time and the replacement time based on the resistance initial value Z 0 and resistance elapsed value Z 1 stored in the resistance value storage unit 141 and the calculation related information (step S106). Specifically, the disconnection time calculation unit 132 calculates the resistance initial value Z 0 , the resistance elapsed value Z 1 , the initial radius value r 0 of the cable 4 included in the calculation-related information, the length l, the resistivity ρ, and the external device 3 The resistance value change function Z shown in Equation 4 above is specified using the resistance value R L of . Further, the wire breakage time calculation unit 132 identifies the tangent line whose slope Z' value of the tangent line of the resistance value change function Z is the slope threshold value included in the calculation related information based on the formula shown in Equation 6 above, and The value of the elapsed years y and the value of the resistance value Z, which are the points of contact between the tangent and the resistance value change function Z, are calculated. Then, the wire breakage time calculation unit 132 calculates the calculated number of years y as the replacement time, and also calculates the time when a predetermined period has elapsed from the replacement time as the wire breakage time.
　そして、断線時期出力部１５２及び交換時期出力部１５３は、断線時期算出部１３２が算出した断線時期と交換時期とを表示し（ステップＳ１０７）、処理を終了する。 Then, the disconnection time output unit 152 and the replacement time output unit 153 display the disconnection time and replacement time calculated by the disconnection time calculation unit 132 (step S107), and the process ends.
　以上説明したように、本実施の形態に係るアナログ電流出力装置１００によれば、Ｄ／Ａ変換器１１０は、制御装置２から情報制御部１３０に入力された制御信号をアナログ電流信号に変換する。また、Ａ／Ｄ変換器１２０は、外部機器３とケーブル４とに印加されるアナログ電圧信号をデジタル電圧信号に変換する。また、抵抗値算出部１３１は、制御信号とデジタル電圧信号とに基づいて、外部機器３及びケーブル４の抵抗値Ｚを算出し、算出した抵抗値Ｚとしての抵抗初期値Ｚ０、抵抗経過値Ｚ１を抵抗値記憶部１４１に記憶させる。そして、断線時期算出部１３２は、抵抗初期値Ｚ０と抵抗経過値Ｚ１とに基づいてケーブル４の断線時期を算出し、断線時期出力部１５２は、ユーザに対して断線時期を出力する。 As explained above, according to the analog current output device 100 according to the present embodiment, the D/A converter 110 converts the control signal input from the control device 2 to the information control section 130 into an analog current signal. . Further, the A/D converter 120 converts analog voltage signals applied to the external device 3 and the cable 4 into digital voltage signals. Further, the resistance value calculation unit 131 calculates the resistance value Z of the external device 3 and the cable 4 based on the control signal and the digital voltage signal, and calculates the resistance initial value Z 0 and resistance elapsed value as the calculated resistance value Z. Z 1 is stored in the resistance value storage section 141. Then, the disconnection time calculation unit 132 calculates the disconnection time of the cable 4 based on the resistance initial value Z 0 and the resistance elapsed value Z 1 , and the disconnection time output unit 152 outputs the disconnection time to the user.
　このようにすることで、本実施の形態に係るアナログ電流出力装置１００は、ケーブル４が将来断線する時期を予測することができる。 By doing so, the analog current output device 100 according to the present embodiment can predict when the cable 4 will break in the future.
　ここで、特許文献１に記載された断線予測装置では、ケーブルの断線が進展している状態であるか否かを判断しようとする度に温度要因及び負荷変動要因による変化分を除外した調整後のケーブルの抵抗値を測定する必要がある。このため、特許文献１に記載された断線予測装置は、ケーブルの断線を予測するのに要する作業が煩雑になる問題がある。 Here, in the disconnection prediction device described in Patent Document 1, each time it is attempted to judge whether or not the cable disconnection is progressing, the adjustment is made after excluding changes due to temperature factors and load fluctuation factors. It is necessary to measure the resistance value of the cable. For this reason, the disconnection prediction device described in Patent Document 1 has a problem in that the work required to predict cable disconnection is complicated.
　これに対して、本実施の形態に係るアナログ電流出力装置１００では、ケーブル４が外部機器３に最初に接続された時期の抵抗初期値Ｚ０と、ケーブル４が外部機器３に最初に接続されてから予め定めた期間が経過した時期の抵抗経過値Ｚ１とを測定するだけで、ケーブル４の断線時期を算出、出力できる。
　このようにすることで、本実施の形態に係るアナログ電流出力装置１００は、特許文献１に記載された断線予測装置よりもケーブルの断線を予測する作業の負荷を低減できる。 On the other hand, in the analog current output device 100 according to the present embodiment, the initial resistance value Z 0 when the cable 4 is first connected to the external device 3 and the resistance initial value Z 0 when the cable 4 is first connected to the external device 3 are The breakage timing of the cable 4 can be calculated and output simply by measuring the resistance elapsed value Z1 at a time when a predetermined period has elapsed since the breakage of the cable 4.
By doing so, the analog current output device 100 according to the present embodiment can reduce the workload of predicting cable breakage more than the breakage prediction device described in Patent Document 1.
　また、本実施の形態に係るアナログ電流出力装置１００によれば、算出関連情報取得部１３３は、ケーブル４の半径初期値ｒ０、長さｌ、抵抗率ρ、外部機器３の抵抗値ＲＬを含む算出関連情報を取得する。そして、断線時期算出部１３２は、抵抗初期値Ｚ０と抵抗経過値Ｚ１と算出関連情報とを用いて特定される抵抗値変化関数Ｚに基づいて断線時期を算出する。
　このようにすることで、本実施の形態に係るアナログ電流出力装置１００は、抵抗値変化関数に基づいて断線時期を算出しないアナログ電流出力装置又は断線予測装置よりも精度良くケーブル４の断線時期を予測できる。 Further, according to the analog current output device 100 according to the present embodiment, the calculation related information acquisition unit 133 calculates the initial radius r 0 , length l, resistivity ρ, and resistance value R L of the external device 3 of the cable 4 . Obtain calculation-related information including. Then, the wire breakage time calculation unit 132 calculates the wire breakage time based on the resistance value change function Z specified using the resistance initial value Z 0 , the resistance elapsed value Z 1 , and the calculation related information.
By doing so, the analog current output device 100 according to the present embodiment can predict the disconnection timing of the cable 4 more accurately than an analog current output device or a disconnection prediction device that does not calculate the disconnection timing based on the resistance value change function. Predictable.
　また、本実施の形態に係るアナログ電流出力装置１００によれば、算出関連情報は、ユーザが予め定めた傾き閾値を含んでいる。そして、断線時期算出部１３２は、抵抗値変化関数Ｚの接線の傾きＺ′の値が傾き閾値となる交換時期を算出し、交換時期出力部１５３は、算出された交換時期を出力する。
　このようにすることで、本実施の形態に係るアナログ電流出力装置１００は、抵抗値変化関数の接線の傾きの値が傾き閾値となる交換時期を算出、出力しないアナログ電流出力装置又は断線予測装置よりも精度良くケーブル４の断線時期及び交換時期を予測できる。 Further, according to the analog current output device 100 according to the present embodiment, the calculation related information includes the slope threshold value predetermined by the user. Then, the wire breakage time calculating section 132 calculates the replacement time when the value of the slope Z' of the tangent to the resistance value change function Z becomes the slope threshold value, and the replacement time output section 153 outputs the calculated replacement time.
By doing so, the analog current output device 100 according to the present embodiment calculates the replacement time when the value of the slope of the tangent of the resistance value change function becomes the slope threshold value, and the analog current output device or disconnection prediction device that does not output the replacement time. It is possible to predict the breakage time and replacement time of the cable 4 with higher accuracy than the conventional method.
　ここで、特許文献１に記載された断線予測装置では、ケーブルの断線が進展している状態であるか否かの判断に用いる抵抗値の閾値は、断線が進展していない正常な状態において温度要因及び負荷変動要因による変化分を除外しないケーブルの抵抗値の最大値よりも大きい値である。具体的には、閾値は、正常な状態のケーブルの抵抗値の初期値に所定の値を加えた値を閾値として設定している。よって、特許文献１に記載された断線予測装置では、閾値を設定するときに用いる所定の値が根拠の不明確な値であるため、ケーブルの断線が実際に発生する時期よりもかなり前の時期において断線が進展していると判断する虞があり、ケーブルが実際の寿命よりもかなり余裕がある段階で交換されてしまう虞がある。 Here, in the disconnection prediction device described in Patent Document 1, the threshold value of the resistance value used for determining whether or not the cable disconnection is progressing is determined by the temperature in the normal state where the disconnection has not progressed. This value is larger than the maximum value of the cable resistance value, excluding changes due to load fluctuation factors and load fluctuation factors. Specifically, the threshold value is set to a value obtained by adding a predetermined value to the initial value of the resistance value of the cable in a normal state. Therefore, in the disconnection prediction device described in Patent Document 1, the predetermined value used when setting the threshold value is a value whose basis is unclear, and therefore, the predetermined value used when setting the threshold value is a value whose basis is unclear, so There is a risk that the cable will be determined to have progressed to a disconnection, and there is a risk that the cable will be replaced at a stage where the cable has a much longer lifespan than its actual lifespan.
　これに対して、本実施の形態に係るアナログ電流出力装置１００では、傾き閾値は、これ以上大きくなるとケーブル４の断線が発生する可能性が十分あるとユーザが認識している抵抗値変化関数Ｚの接線の傾きＺ′の値が予め定められている。
　このようにすることで、本実施の形態に係るアナログ電流出力装置１００は、特許文献１に記載された断線予測装置よりも精度良くケーブル４の交換時期を予測でき、ケーブル４の実際の寿命に近い段階で交換できる。 On the other hand, in the analog current output device 100 according to the present embodiment, the slope threshold value is determined by the resistance value change function Z at which the user recognizes that there is a sufficient possibility that the cable 4 will break if it becomes larger than this value. The value of the slope Z' of the tangent line is predetermined.
By doing so, the analog current output device 100 according to the present embodiment can predict the replacement time of the cable 4 with higher accuracy than the disconnection prediction device described in Patent Document 1, and can reduce the actual lifespan of the cable 4. It can be replaced in the near future.
［実施の形態２］
　実施の形態１では、断線時期を予測することが可能なアナログ電流出力装置１００について説明したが、断線時期を予測することが可能である限りにおいてアナログ電流出力装置１００ではない装置であってもよい。以下、図８、図９を参照して、実施の形態２に係る断線予測装置２００について、詳細に説明する。なお、実施の形態２では、実施の形態１と異なる構成について説明し、実施の形態１と同一の構成については冗長であるため説明を省略する。 [Embodiment 2]
In the first embodiment, the analog current output device 100 capable of predicting the time of wire breakage has been described, but a device other than the analog current output device 100 may be used as long as it is possible to predict the time of wire breakage. . Hereinafter, the disconnection prediction device 200 according to the second embodiment will be described in detail with reference to FIGS. 8 and 9. Note that in the second embodiment, configurations that are different from those in the first embodiment will be described, and descriptions of the same configurations as in the first embodiment will be omitted because they are redundant.
（実施の形態２に係る断線予測装置２００について）
　図８に示すように、本開示の実施の形態２に係る断線予測装置２００は、外部負荷３０に接続されたケーブル４の断線を予測するコンピュータ装置である。断線予測装置２００は、実施の形態１と同様の情報制御部１３０、情報記憶部１４０、情報出力部１５０を備える。情報制御部１３０は、実施の形態１と同様の抵抗値算出部１３１、断線時期算出部１３２、算出関連情報取得部１３３を含む。また、情報記憶部１４０は、実施の形態１と同様の抵抗値記憶部１４１、算出関連情報記憶部１４２を含む。また、情報出力部１５０は、実施の形態１と同様の入力画面表示部１５１、断線時期出力部１５２、交換時期出力部１５３を含む。 (About the disconnection prediction device 200 according to the second embodiment)
As shown in FIG. 8, a disconnection prediction device 200 according to Embodiment 2 of the present disclosure is a computer device that predicts disconnection of a cable 4 connected to an external load 30. The disconnection prediction device 200 includes an information control section 130, an information storage section 140, and an information output section 150 similar to those in the first embodiment. The information control section 130 includes a resistance value calculation section 131, a wire breakage time calculation section 132, and a calculation-related information acquisition section 133 similar to those in the first embodiment. Further, the information storage section 140 includes a resistance value storage section 141 and a calculation-related information storage section 142 similar to those in the first embodiment. Further, the information output section 150 includes an input screen display section 151, a disconnection time output section 152, and a replacement time output section 153 similar to those in the first embodiment.
（実施の形態２に係る断線予測装置２００のハードウェア構成について）
　なお、断線予測装置２００のハードウェア構成は、「アナログ電流出力装置１００」を「断線予測装置２００」と読み替えることで、実施の形態１と同様の説明になる。よって、断線予測装置２００のハードウェア構成については、冗長な説明を省略するため、図示及び詳細な説明を省略する。 (About the hardware configuration of the disconnection prediction device 200 according to the second embodiment)
Note that the hardware configuration of the disconnection prediction device 200 will be explained in the same manner as in the first embodiment by replacing “analog current output device 100” with “disconnection prediction device 200.” Therefore, to avoid redundant explanation of the hardware configuration of the wire breakage prediction device 200, illustration and detailed explanation will be omitted.
（実施の形態２に係る断線予測装置２００の機能構成の詳細について）
　抵抗値算出部１３１は、ケーブル４から外部負荷３０に出力される電流と、外部負荷３０とケーブル４とに印加される電圧とに基づいて、外部負荷３０及びケーブル４の抵抗値Ｚを算出する。本実施の形態では、抵抗値算出部１３１は、抵抗値Ｚとして、抵抗初期値Ｚ０及び抵抗経過値Ｚ１だけでなく、予め定めた期間を超えてからも抵抗値Ｚを算出する。例えば、抵抗値算出部１３１は、予め定めた確認期間、例えば、１ヶ月が経過する度に抵抗値Ｚを算出する。 (About the details of the functional configuration of the disconnection prediction device 200 according to the second embodiment)
The resistance value calculation unit 131 calculates the resistance value Z of the external load 30 and the cable 4 based on the current output from the cable 4 to the external load 30 and the voltage applied to the external load 30 and the cable 4. . In the present embodiment, the resistance value calculation unit 131 calculates the resistance value Z not only from the resistance initial value Z 0 and the resistance elapsed value Z 1 but also after a predetermined period has elapsed. For example, the resistance value calculation unit 131 calculates the resistance value Z every time a predetermined confirmation period, for example, one month passes.
　なお、断線時期算出部１３２、算出関連情報取得部１３３及び入力画面表示部１５１は、「外部機器」を「外部負荷」、「３」を「３０」と読み替えることで、実施の形態１と同様の説明になる。よって、断線時期算出部１３２、算出関連情報取得部１３３及び入力画面表示部１５１については、冗長な説明を省略するため、図示及び詳細な説明を省略する。 Note that the disconnection time calculation unit 132, calculation-related information acquisition unit 133, and input screen display unit 151 are the same as in the first embodiment by replacing “external device” with “external load” and “3” with “30”. This is an explanation. Therefore, illustrations and detailed descriptions of the wire breakage time calculation section 132, the calculation-related information acquisition section 133, and the input screen display section 151 will be omitted to avoid redundant explanations.
　なお、本実施の形態では、断線時期算出部１３２は、傾きＺ′の値が傾き閾値となる折線と抵抗値変化関数Ｚとの接点である経過年数ｙの値と抵抗値Ｚの値とを算出し、算出した抵抗値Ｚの値を抵抗値Ｚの閾値である抵抗閾値とする。 In the present embodiment, the wire breakage time calculation unit 132 calculates the value of the number of years y that has passed and the value of the resistance value Z, which is the point of contact between the broken line and the resistance value change function Z, where the value of the slope Z' is the slope threshold value. The calculated resistance value Z is defined as a resistance threshold value that is a threshold value of the resistance value Z.
　例えば、抵抗閾値をＺｓとした場合、上述した数４に示す数式に、Ｚ＝Ｚｓ、ｒ０＝０．５１２×１０－３、ｌ＝１０００、ρ＝１．７２×１０－８、ＲＬ＝２５０、ｃ＝０．０３５×１０－３、ｙ＝１０．１５７を代入すると、抵抗閾値Ｚｓは、Ｚｓ＝（１．７２×１０－８×１０００）／｛３．１４×（０．５１２×１０－３－０．０３５×１０－３×１０．１５７）２｝＋２５０＝４７３．５６［Ω］である。 For example, when the resistance threshold value is Z s , the formula shown in Equation 4 above is Z=Z s , r 0 =0.512×10 −3 , l=1000, ρ=1.72×10 −8 , Substituting R L =250, c=0.035×10 −3 and y=10.157, the resistance threshold Z s is Z s =(1.72×10 −8 ×1000)/{3.14× (0.512×10 −3 −0.035×10 −3 ×10.157) 2 }+250=473.56 [Ω].
　交換時期出力部１５３は、抵抗値算出部１３１が算出した抵抗値Ｚが抵抗閾値Ｚｓとなったとき、交換時期である旨を示す情報である交換時期情報を表示することで、交換時期を出力する。例えば、交換時期出力部１５３は、例えば、「ケーブルを交換してください」との文字画像を表示部５５に表示したり、交換時期である旨を通知する通知音をスピーカから出力したりすることで、交換時期情報を表示する。 The replacement time output unit 153 indicates the replacement time by displaying replacement time information, which is information indicating that it is time to replace, when the resistance value Z calculated by the resistance value calculation unit 131 reaches the resistance threshold value Zs . Output. For example, the replacement time output unit 153 may display a text image of “Please replace the cable” on the display unit 55, or output a notification sound from the speaker to notify that it is time to replace the cable. Displays replacement timing information.
（実施の形態２に係る交換時期出力処理について）
　次に、フローチャートを用いて断線予測装置２００が交換時期を出力する動作について説明する。断線予測装置２００は、ケーブル４が外部負荷３０に最初に接続されてから電源をオンにすると、図９に示す交換時期出力処理の実行を開始する。先ず、断線予測装置２００の入力画面表示部１５１及び算出関連情報取得部１３３は、ステップＳ１０１、Ｓ１０２の処理を実行する。 (Regarding replacement time output processing according to Embodiment 2)
Next, the operation of the disconnection prediction device 200 to output the replacement time will be explained using a flowchart. When the cable 4 is first connected to the external load 30 and the power is turned on, the disconnection prediction device 200 starts executing the replacement time output process shown in FIG. 9 . First, the input screen display section 151 and the calculation-related information acquisition section 133 of the wire breakage prediction device 200 execute the processes of steps S101 and S102.
　次に、抵抗値算出部１３１は、ケーブル４から外部負荷３０に出力される電流と、外部負荷３０とケーブル４とに印加される電圧とに基づいて、外部負荷３０及びケーブル４の抵抗初期値Ｚ０を算出し、抵抗値記憶部１４１に抵抗初期値Ｚ０を記憶させる（ステップＳ１１３）。次に、情報制御部１３０は、ステップＳ１０４の処理を実行し、情報制御部１３０の抵抗値算出部１３１は、予め定めた期間が経過した場合（ステップＳ１０４；Ｙ）、ケーブル４から外部負荷３０に出力される電流と、外部負荷３０とケーブル４とに印加される電圧とに基づいて、外部負荷３０及びケーブル４の抵抗経過値Ｚ１を算出し、抵抗値記憶部１４１に抵抗経過値Ｚ１を記憶させる（ステップＳ１１５）。 Next, the resistance value calculation unit 131 calculates initial resistance values of the external load 30 and the cable 4 based on the current output from the cable 4 to the external load 30 and the voltage applied to the external load 30 and the cable 4. Z 0 is calculated, and the resistance initial value Z 0 is stored in the resistance value storage unit 141 (step S113). Next, the information control unit 130 executes the process of step S104, and when a predetermined period of time has elapsed (step S104; Y), the resistance value calculation unit 131 of the information control unit 130 determines that the Based on the current output to the external load 30 and the voltage applied to the external load 30 and the cable 4, the resistance elapsed value Z1 of the external load 30 and the cable 4 is calculated, and the resistance elapsed value Z1 is stored in the resistance value storage section 141. 1 is stored (step S115).
　次に、断線時期算出部１３２は、ステップＳ１０６の処理を実行する。なお、ステップＳ１０６における交換時期及び断線時期の具体的な算出方法については、「外部機器」を「外部負荷」、「３」を「３０」と読み替えることで、実施の形態１と同様の説明になるため、冗長な説明を省略するため、詳細な説明を省略する。次に、断線時期算出部１３２は、交換時期における抵抗値Ｚの値である抵抗閾値を算出し（ステップＳ１１６）、断線時期出力部１５２及び交換時期出力部１５３は、ステップＳ１０７の処理を実行する。 Next, the disconnection time calculation unit 132 executes the process of step S106. Note that the specific method for calculating the replacement time and disconnection time in step S106 can be explained in the same manner as in the first embodiment by replacing "external device" with "external load" and "3" with "30". Therefore, detailed explanation will be omitted to avoid redundant explanation. Next, the wire breakage time calculation unit 132 calculates a resistance threshold value that is the value of the resistance value Z at the replacement time (step S116), and the wire breakage time output unit 152 and the replacement time output unit 153 execute the process of step S107. .
　次に、情報制御部１３０は、抵抗値算出部１３１が抵抗値Ｚを算出してから予め定めた確認期間、例えば、１ヶ月が経過したか否かを判定する（ステップＳ１２１）。情報制御部１３０は、予め定めた確認期間が経過していない場合（ステップＳ１２１；Ｎ）、予め定めた確認期間が経過するまでステップＳ１２１の処理を繰り返す。一方、情報制御部１３０の抵抗値算出部１３１は、予め定めた確認期間が経過した場合（ステップＳ１２１；Ｙ）、ケーブル４から外部負荷３０に出力される電流と、外部負荷３０とケーブル４とに印加される電圧とに基づいて、外部負荷３０及びケーブル４の抵抗値Ｚを算出し、抵抗値記憶部１４１に算出した抵抗値Ｚを記憶させる（ステップＳ１２２）。 Next, the information control unit 130 determines whether a predetermined confirmation period, for example, one month, has passed since the resistance value calculation unit 131 calculated the resistance value Z (step S121). If the predetermined confirmation period has not elapsed (step S121; N), the information control unit 130 repeats the process of step S121 until the predetermined confirmation period has elapsed. On the other hand, if the predetermined confirmation period has elapsed (step S121; Y), the resistance value calculation unit 131 of the information control unit 130 calculates the current output from the cable 4 to the external load 30 and the relationship between the external load 30 and the cable 4. The resistance value Z of the external load 30 and the cable 4 is calculated based on the voltage applied to the external load 30 and the cable 4, and the calculated resistance value Z is stored in the resistance value storage unit 141 (step S122).
　次に、情報制御部１３０は、算出した抵抗値Ｚが抵抗閾値になったか否かを判定する（ステップＳ１２３）。情報制御部１３０は、算出した抵抗値Ｚが抵抗閾値になっていない場合（ステップＳ１２３；Ｎ）、ステップＳ１２１に戻り、算出した抵抗値Ｚが抵抗閾値になるまでステップ１２１～１２３の処理を繰り返す。一方、情報制御部１３０は、算出した抵抗値Ｚが抵抗閾値になった場合（ステップＳ１２３；Ｙ）、交換時期出力部１５３に交換時期情報を表示させ（ステップＳ１２４）、処理を終了する。 Next, the information control unit 130 determines whether the calculated resistance value Z has reached the resistance threshold (step S123). If the calculated resistance value Z does not reach the resistance threshold value (step S123; N), the information control unit 130 returns to step S121 and repeats the processes of steps 121 to 123 until the calculated resistance value Z reaches the resistance threshold value. . On the other hand, when the calculated resistance value Z reaches the resistance threshold (step S123; Y), the information control unit 130 causes the replacement time output unit 153 to display replacement time information (step S124), and ends the process.
　以上説明したように、本実施の形態に係る断線予測装置２００によれば、抵抗値算出部１３１は、ケーブル４から外部負荷３０に出力される電流と、外部負荷３０とケーブル４とに印加される電圧とに基づいて、外部負荷３０及びケーブル４の抵抗値Ｚを算出する。そして、断線時期算出部１３２は、抵抗初期値Ｚ０と抵抗経過値Ｚ１とに基づいてケーブル４の断線時期を算出し、断線時期出力部１５２は、断線時期を出力する。
　このようにすることで、本実施の形態に係る断線予測装置２００は、実施の形態１に係るアナログ電流出力装置１００と同様に、ケーブル４が将来断線する時期を予測することができる。 As described above, according to the disconnection prediction device 200 according to the present embodiment, the resistance value calculation unit 131 calculates the current output from the cable 4 to the external load 30 and the current applied to the external load 30 and the cable 4. The resistance value Z of the external load 30 and the cable 4 is calculated based on the voltage. Then, the disconnection time calculation unit 132 calculates the disconnection time of the cable 4 based on the resistance initial value Z 0 and the resistance elapsed value Z 1 , and the disconnection time output unit 152 outputs the disconnection time.
By doing so, the disconnection prediction device 200 according to the present embodiment can predict when the cable 4 will be disconnected in the future, similarly to the analog current output device 100 according to the first embodiment.
　また、本実施の形態に係る断線予測装置２００によれば、算出関連情報は、ユーザが予め定めた傾き閾値を含んでいる。そして、断線時期算出部１３２は、抵抗値変化関数Ｚの接線の傾きＺ′の値が傾き閾値となる抵抗値を抵抗閾値として算出し、交換時期出力部１５３は、抵抗値算出部１３１が算出した抵抗値Ｚが抵抗閾値となった場合、交換時期情報を表示する。
　このようにすることで、本実施の形態に係る断線予測装置２００は、算出した抵抗値Ｚが抵抗閾値となった場合に交換時期を出力しないアナログ電流出力装置又は断線予測装置よりも精度良くケーブル４の断線時期及び交換時期を予測できる。
　その他、本実施の形態に係る断線予測装置２００は、実施の形態１に係るアナログ電流出力装置１００と同様の作用効果を奏する。 Further, according to the wire breakage prediction device 200 according to the present embodiment, the calculation related information includes the slope threshold value predetermined by the user. Then, the wire breakage time calculation unit 132 calculates a resistance value at which the value of the slope Z' of the tangent to the resistance value change function Z becomes the slope threshold value as the resistance threshold value, and the replacement time output unit 153 calculates the resistance value calculated by the resistance value calculation unit 131. When the resistance value Z becomes the resistance threshold value, replacement time information is displayed.
By doing so, the wire breakage prediction device 200 according to the present embodiment can predict cable breakage more accurately than an analog current output device or a wire breakage prediction device that does not output a replacement time when the calculated resistance value Z reaches the resistance threshold value. It is possible to predict the time of wire breakage and replacement time of 4.
In addition, the disconnection prediction device 200 according to the present embodiment has the same effects as the analog current output device 100 according to the first embodiment.
［変更例］
　なお、上記の実施の形態１では、断線時期算出部１３２は、抵抗値変化関数Ｚの接線の傾きＺ′の値が傾き閾値となる接線と抵抗値変化関数Ｚとの接点である経過年数ｙの値を交換時期として算出したが、これに限定されない。例えば、断線時期算出部１３２は、算出された経過年数ｙの値を断線時期として算出してもよい。この場合、断線時期算出部１３２は、算出された断線時期から予め定めた期間、例えば、３ヶ月間だけ遡った時期を交換時期として算出してもよい。なお、この場合、ユーザは、抵抗値変化関数Ｚの接線の傾き閾値を、交換時期ではなく断線時期に基づいて定める必要がある。 [Example of change]
In the above-described first embodiment, the wire breakage time calculation unit 132 calculates the number of years y that has passed, which is the point of contact between the tangent and the resistance value change function Z, where the value of the slope Z' of the tangent to the resistance value change function Z is the slope threshold value. Although the value of is calculated as the replacement time, it is not limited to this. For example, the wire breakage time calculation unit 132 may calculate the calculated value of the number of years y as the wire breakage time. In this case, the wire breakage time calculation unit 132 may calculate a time that is a predetermined period, for example, three months, as the replacement time from the calculated wire breakage time. In this case, the user needs to determine the slope threshold of the tangent to the resistance value change function Z based on the disconnection time rather than the replacement time.
　なお、上記の実施の形態２では、断線時期算出部１３２は、抵抗値変化関数Ｚの接線の傾きＺ′の値が傾き閾値となる接線と抵抗値変化関数Ｚとの接点である抵抗値Ｚの値を交換時期に応じた抵抗閾値として算出したが、これに限定されない。例えば、断線時期算出部１３２は、算出された抵抗値Ｚの値を断線時期に応じた抵抗値として算出してもよい。この場合、断線時期算出部１３２は、算出された抵抗値Ｚから予め定めた値を減算した値を抵抗閾値として算出してもよい。なお、この場合、ユーザは、抵抗値変化関数Ｚの接線の傾き閾値を、交換時期ではなく断線時期に基づいて定める必要がある。 In the second embodiment described above, the disconnection timing calculation unit 132 calculates the resistance value Z, which is the point of contact between the tangent and the resistance value change function Z, where the value of the slope Z' of the tangent to the resistance value change function Z is the slope threshold value. Although the value of is calculated as the resistance threshold value depending on the replacement time, the value is not limited to this. For example, the wire breakage time calculation unit 132 may calculate the calculated resistance value Z as a resistance value corresponding to the wire breakage time. In this case, the disconnection timing calculation unit 132 may calculate a value obtained by subtracting a predetermined value from the calculated resistance value Z as the resistance threshold value. In this case, the user needs to determine the slope threshold of the tangent to the resistance value change function Z based on the disconnection time rather than the replacement time.
　なお、上記の実施の形態１、２のように、交換時期出力部１５３が交換時期を出力することが好ましいが、精度良く算出された断線時期が出力されることでユーザが交換時期を予測できるため、交換時期については出力されなくてもよい。 Although it is preferable that the replacement time output unit 153 outputs the replacement time as in the first and second embodiments described above, the user can predict the replacement time by outputting the accurately calculated disconnection time. Therefore, the replacement timing does not need to be output.
　なお、上記の実施の形態１、２では、断線時期及び交換時期を算出したときに交換時期を出力しているが、交換時期は算出したときに出力しなくてもよく、例えば、交換時期となったときに出力してもよい。この場合、上記の実施の形態２のように、交換時期情報を表示することで、交換時期を出力してもよい。 In addition, in the first and second embodiments described above, the replacement time is output when the wire breakage time and the replacement time are calculated, but the replacement time does not have to be output when calculated. For example, the replacement time and the replacement time are output. You can output it when the In this case, the replacement time may be output by displaying the replacement time information as in the second embodiment described above.
　なお、上記の実施の形態１では、アナログ電流出力装置１００は、図７に示す断線時期出力処理を実行しているが、これに限定されず、アナログ電流出力装置１００は、図９に示す交換時期出力処理を実行してもよい。また、上記の実施の形態２では、断線予測装置２００は、図９に示す交換時期出力処理を実行しているが、これに限定されず、断線予測装置２００は、図７に示す断線時期出力処理を実行してもよい。 In the first embodiment described above, the analog current output device 100 executes the disconnection timing output process shown in FIG. 7, but the analog current output device 100 executes the disconnection timing output process shown in FIG. Timing output processing may also be executed. Further, in the second embodiment described above, the wire breakage prediction device 200 executes the replacement time output process shown in FIG. 9, but the wire breakage prediction device 200 executes the wire breakage time output process shown in FIG. Processing may be executed.
　なお、上記の実施の形態１、２では、断線時期算出部１３２が用いる算出関連情報は、算出関連情報取得部１３３が最初に取得して算出関連情報記憶部１４２が記憶している情報であるが、算出関連情報は更新可能であってもよい。具体的には、外部機器３又は外部負荷３０の抵抗値、傾き閾値については更新可能であってもよい。この場合、算出関連情報取得部１３３が新たな算出関連情報を取得した場合に算出関連情報記憶部１４２が記憶している算出関連情報を新たな算出関連情報に更新可能とする必要がある。 Note that in the first and second embodiments described above, the calculation-related information used by the disconnection time calculation unit 132 is information that is first acquired by the calculation-related information acquisition unit 133 and stored in the calculation-related information storage unit 142. However, the calculation related information may be updatable. Specifically, the resistance value and slope threshold of the external device 3 or the external load 30 may be updatable. In this case, when the calculation-related information acquisition unit 133 acquires new calculation-related information, it is necessary to be able to update the calculation-related information stored in the calculation-related information storage unit 142 to new calculation-related information.
　なお、制御部５１、主記憶部５２、外部記憶部５３、操作部５４、送受信部５６、内部バス５０を備えるアナログ電流出力装置１００、断線予測装置２００が処理を行う中心となる部分は、例えば、前記の動作を実行するプログラムを、アナログ電流出力装置１００、断線予測装置２００が読み取り可能な記録媒体、例えば、フラッシュメモリに格納して配布し、プログラムをインストールすることにより、上記の処理を実行するアナログ電流出力装置１００、断線予測装置２００を構成してもよい。また、ＬＡＮ、インターネット等の通信ネットワーク上のサーバ装置が有する記憶装置にプログラムを格納しておき、アナログ電流出力装置１００、断線予測装置２００がプログラムをダウンロードすることでアナログ電流出力装置１００、断線予測装置２００を構成してもよい。 Note that the main parts that are processed by the analog current output device 100 and the disconnection prediction device 200, which include the control section 51, the main storage section 52, the external storage section 53, the operation section 54, the transmission/reception section 56, and the internal bus 50, are, for example, , a program that executes the above operation is stored and distributed in a recording medium readable by the analog current output device 100 and the disconnection prediction device 200, for example, a flash memory, and the above process is executed by installing the program. The analog current output device 100 and disconnection prediction device 200 may be configured. In addition, a program is stored in a storage device of a server device on a communication network such as a LAN or the Internet, and the analog current output device 100 and the disconnection prediction device 200 download the program. Device 200 may be configured.
　また、アナログ電流出力装置１００、断線予測装置２００の機能は、ＯＳ（Operating System）とアプリケーションプログラムの分担、又はＯＳとアプリケーションプログラムとの協働により実現する場合には、アプリケーションプログラム部分のみを記録媒体又は記憶装置に格納してもよい。 In addition, when the functions of the analog current output device 100 and the disconnection prediction device 200 are realized by sharing the OS (Operating System) and the application program, or by cooperating with the OS and the application program, only the application program portion is stored on the recording medium. Alternatively, it may be stored in a storage device.
　また、搬送波にプログラムを重畳し、通信ネットワークを介して提供することも可能である。例えば、通信ネットワーク上の掲示板（ＢＢＳ：Bulletin Board System）にプログラムを掲示し、ネットワークを介してプログラムを提供してもよい。そして、プログラムを起動し、ＯＳの制御下で、他のアプリケーションプログラムと同様に実行することにより、前記の処理を実行してもよい。 It is also possible to superimpose a program on a carrier wave and provide it via a communication network. For example, the program may be posted on a bulletin board system (BBS) on a communication network and provided via the network. Then, the above process may be executed by starting the program and executing it under the control of the OS in the same way as other application programs.
　本開示は、本開示の広義の精神と範囲を逸脱することなく、様々な実施の形態及び変形が可能とされるものである。また、上述した実施の形態は、本開示を説明するためのものであり、本開示の範囲を限定するものではない。つまり、本開示の範囲は、実施の形態ではなく、請求の範囲によって示される。そして、請求の範囲内及びそれと同等の開示の意義の範囲内で施される様々な変形が、本開示の範囲内とみなされる。 The present disclosure is capable of various embodiments and modifications without departing from the broad spirit and scope of the present disclosure. Further, the embodiments described above are for explaining the present disclosure, and do not limit the scope of the present disclosure. In other words, the scope of the present disclosure is indicated by the claims rather than the embodiments. Various modifications made within the scope of the claims and the meaning of the disclosure equivalent thereto are considered to be within the scope of the present disclosure.
１…ＦＡシステム、２…制御装置、３…外部機器、４…ケーブル、３０…外部負荷、５０…内部バス、５１…制御部、５２…主記憶部、５３…外部記憶部、５４…操作部、５５…表示部、５６…送受信部、５９…制御プログラム、１００…アナログ電流出力装置、１１０…Ｄ／Ａ変換器、１２０…Ａ／Ｄ変換器、１３０…情報制御部、１３１…抵抗値算出部、１３２…断線時期算出部、１３３…算出関連情報取得部、１４０…情報記憶部、１４１…抵抗値記憶部、１４２…算出関連情報記憶部、１５０…情報出力部、１５１…入力画面表示部、１５２…断線時期出力部、１５３…交換時期出力部、１６０…入力画面、１６１…半径初期値入力欄、１６２…長さ入力欄、１６３…抵抗率入力欄、１６４…外部機器抵抗値入力欄、１６５…傾き閾値入力欄、２００…断線予測装置。 DESCRIPTION OF SYMBOLS 1... FA system, 2... Control device, 3... External device, 4... Cable, 30... External load, 50... Internal bus, 51... Control section, 52... Main storage section, 53... External storage section, 54... Operation section , 55... Display section, 56... Transmission/reception section, 59... Control program, 100... Analog current output device, 110... D/A converter, 120... A/D converter, 130... Information control section, 131... Resistance value calculation 132...Disconnection time calculation unit, 133...Calculation related information acquisition unit, 140...Information storage unit, 141...Resistance value storage unit, 142...Calculation related information storage unit, 150...Information output unit, 151...Input screen display unit , 152...Disconnection time output section, 153...Replacement time output section, 160...Input screen, 161...Radius initial value input field, 162...Length input field, 163...Resistivity input field, 164...External device resistance value input field , 165...Inclination threshold input field, 200... Disconnection prediction device.

Claims (8)

  1. 　制御装置から送信された制御信号を変換したアナログ電流信号を、制御対象としての外部機器にケーブルを介して出力するアナログ電流出力装置であって、
    　入力された前記制御信号を前記アナログ電流信号に変換するＤ／Ａ変換器と、
    　前記外部機器と前記ケーブルとに印加されるアナログ電圧信号をデジタル電圧信号に変換するＡ／Ｄ変換器と、
    　前記制御信号と前記デジタル電圧信号とに基づいて、前記外部機器及び前記ケーブルの抵抗値を算出する抵抗値算出部と、
    　前記ケーブルが前記外部機器に最初に接続された時期に算出された前記抵抗値の初期値である抵抗初期値を少なくとも記憶する抵抗値記憶部と、
    　前記抵抗初期値と、前記ケーブルが前記外部機器に最初に接続されてから予め定めた期間が経過した時期に算出された前記抵抗値である抵抗経過値とに基づいて、前記ケーブルが断線する時期である断線時期を算出する断線時期算出部と、
    　前記断線時期を出力する断線時期出力部と、
    　を備えるアナログ電流出力装置。     An analog current output device that outputs an analog current signal obtained by converting a control signal transmitted from a control device to an external device as a control target via a cable,
    a D/A converter that converts the inputted control signal into the analog current signal;
    an A/D converter that converts an analog voltage signal applied to the external device and the cable into a digital voltage signal;
    a resistance value calculation unit that calculates resistance values of the external device and the cable based on the control signal and the digital voltage signal;
    a resistance value storage unit that stores at least an initial resistance value that is an initial value of the resistance value calculated when the cable is first connected to the external device;
    The timing at which the cable is disconnected based on the initial resistance value and the resistance elapsed value, which is the resistance value calculated when a predetermined period of time has elapsed since the cable was first connected to the external device. a wire breakage time calculation unit that calculates the wire breakage time;
    a wire breakage time output unit that outputs the wire breakage time;
    An analog current output device comprising:
  2. 　前記ケーブルの半径の初期値、長さ及び抵抗率、ならびに、前記外部機器の抵抗値を含む前記断線時期の算出に関する情報である算出関連情報を取得する算出関連情報取得部、
    　を更に含み、
    　前記断線時期算出部は、前記抵抗初期値と前記抵抗経過値と前記算出関連情報とを用いて特定される時間の経過と前記抵抗値の変化との対応関係を示す関数である抵抗値変化関数に基づいて前記断線時期を算出する、
    　請求項１に記載のアナログ電流出力装置。     a calculation-related information acquisition unit that acquires calculation-related information that is information related to calculation of the breakage time, including the initial value of the radius, length, and resistivity of the cable, and the resistance value of the external device;
    further including;
    The wire breakage time calculation unit calculates a resistance value change function that is a function that indicates a correspondence relationship between the passage of time specified using the resistance initial value, the resistance elapsed value, and the calculation related information and the change in the resistance value. Calculating the disconnection time based on
    The analog current output device according to claim 1.
  3. 　前記算出関連情報は、ユーザが予め定めた前記抵抗値変化関数の接線の傾きの閾値である傾き閾値を含み、
    　前記断線時期算出部は、前記抵抗値変化関数の接線の傾きの値が前記傾き閾値となる時期を、前記ケーブルを交換する時期である交換時期として算出し、
    　前記交換時期を出力する交換時期出力部、を更に備える、
    　請求項２に記載のアナログ電流出力装置。     The calculation related information includes a slope threshold that is a threshold for the slope of the tangent to the resistance value change function predetermined by the user;
    The disconnection time calculation unit calculates a time when the value of the slope of the tangent to the resistance value change function reaches the slope threshold as a replacement time that is a time to replace the cable,
    further comprising a replacement time output unit that outputs the replacement time;
    The analog current output device according to claim 2.
  4. 　前記算出関連情報は、ユーザが予め定めた前記抵抗値変化関数の接線の傾きの閾値である傾き閾値を含み、
    　前記断線時期算出部は、前記抵抗値変化関数の接線の傾きの値が前記傾き閾値となる前記抵抗値を閾値としての抵抗閾値として算出し、
    　前記抵抗値算出部が算出した前記抵抗値が前記抵抗閾値となった場合、前記ケーブルを交換する時期である交換時期である旨を示す情報である交換時期情報を表示する交換時期出力部、を更に備える
    　請求項２に記載のアナログ電流出力装置。     The calculation related information includes a slope threshold that is a threshold for the slope of the tangent to the resistance value change function predetermined by the user;
    The wire breakage time calculation unit calculates the resistance value at which the value of the slope of the tangent to the resistance value change function is the slope threshold value as a resistance threshold value,
    a replacement time output unit that displays replacement time information that is information indicating that it is time to replace the cable when the resistance value calculated by the resistance value calculation unit reaches the resistance threshold value; The analog current output device according to claim 2, further comprising:
  5. 　制御装置と、前記制御装置から送信された制御信号をアナログ電流信号に変換して出力するアナログ電流出力装置と、前記アナログ電流出力装置から前記アナログ電流信号がケーブルを介して出力される制御対象としての外部機器とを備えるＦＡシステムであって、
    　前記アナログ電流出力装置は、
    　　入力された前記制御信号を前記アナログ電流信号に変換するＤ／Ａ変換器と、
    　　前記外部機器と前記ケーブルとに印加されるアナログ電圧信号をデジタル電圧信号に変換するＡ／Ｄ変換器と、
    　　前記制御信号と前記デジタル電圧信号とに基づいて、前記外部機器及び前記ケーブルの抵抗値を算出する抵抗値算出部と、
    　　前記ケーブルが前記外部機器に最初に接続された時期に算出された前記抵抗値の初期値である抵抗初期値を少なくとも記憶する抵抗値記憶部と、
    　　前記抵抗初期値と、前記ケーブルが前記外部機器に最初に接続されてから予め定めた期間が経過した時期に算出された前記抵抗値である抵抗経過値とに基づいて、前記ケーブルが断線する時期である断線時期を算出する断線時期算出部と、
    　　前記断線時期を出力する断線時期出力部と、
    　を含む、
    　ＦＡシステム。     A control device, an analog current output device that converts a control signal transmitted from the control device into an analog current signal and outputs it, and a controlled object to which the analog current signal is output from the analog current output device via a cable. An FA system comprising an external device,
    The analog current output device includes:
    a D/A converter that converts the inputted control signal into the analog current signal;
    an A/D converter that converts an analog voltage signal applied to the external device and the cable into a digital voltage signal;
    a resistance value calculation unit that calculates resistance values of the external device and the cable based on the control signal and the digital voltage signal;
    a resistance value storage unit that stores at least an initial resistance value that is an initial value of the resistance value calculated when the cable is first connected to the external device;
    The timing at which the cable is disconnected based on the initial resistance value and the resistance elapsed value, which is the resistance value calculated when a predetermined period of time has elapsed since the cable was first connected to the external device. a wire breakage time calculation unit that calculates the wire breakage time;
    a wire breakage time output unit that outputs the wire breakage time;
    including,
    FA system.
  6. 　外部負荷に接続されたケーブルの断線を予測する断線予測装置であって、
    　前記ケーブルから前記外部負荷に出力される電流と、前記外部負荷と前記ケーブルとに印加される電圧とに基づいて、前記外部負荷及び前記ケーブルの抵抗値を算出する抵抗値算出部と、
    　前記ケーブルが前記外部負荷に最初に接続された時期に算出された前記抵抗値の初期値である抵抗初期値と、前記ケーブルが前記外部負荷に最初に接続されてから予め定めた期間が経過した時期に算出された前記抵抗値である抵抗経過値とに基づいて、前記ケーブルが断線する時期である断線時期を算出する断線時期算出部と、
    　前記断線時期を出力する断線時期出力部と、
    　を備える断線予測装置。     A disconnection prediction device that predicts disconnection of a cable connected to an external load,
    a resistance value calculation unit that calculates resistance values of the external load and the cable based on a current output from the cable to the external load and a voltage applied to the external load and the cable;
    an initial resistance value that is an initial value of the resistance value calculated at the time when the cable was first connected to the external load, and a predetermined period of time that has elapsed since the cable was first connected to the external load. a breakage time calculation unit that calculates a breakage time, which is the time when the cable breaks, based on a resistance elapsed value, which is the resistance value calculated at the time;
    a wire breakage time output unit that outputs the wire breakage time;
    A disconnection prediction device comprising:
  7. 　外部負荷に接続されたケーブルの断線を予測する断線予測方法であって、
    　コンピュータが、前記ケーブルから前記外部負荷に出力される電流と、前記外部負荷と前記ケーブルとに印加される電圧とに基づいて、前記外部負荷及び前記ケーブルの抵抗値を算出する抵抗値算出ステップと、
    　前記コンピュータが、前記ケーブルが前記外部負荷に最初に接続された時期に算出された前記抵抗値の初期値である抵抗初期値と、前記ケーブルが前記外部負荷に最初に接続されてから予め定めた期間が経過した時期に算出された前記抵抗値である抵抗経過値とに基づいて、前記ケーブルが断線する時期である断線時期を算出する断線時期算出ステップと、
    　前記コンピュータが、前記断線時期を出力する断線時期出力ステップと、
    　を含む断線予測方法。     A disconnection prediction method for predicting disconnection of a cable connected to an external load,
    a resistance value calculation step in which the computer calculates resistance values of the external load and the cable based on a current output from the cable to the external load and a voltage applied to the external load and the cable; ,
    The computer calculates an initial resistance value that is an initial value of the resistance value calculated when the cable is first connected to the external load, and a resistance value that is predetermined after the cable is first connected to the external load. a breakage time calculation step of calculating a breakage time, which is the time when the cable breaks, based on the resistance elapsed value, which is the resistance value calculated at the time when the period has elapsed;
    a wire breakage time output step in which the computer outputs the wire breakage time;
    Disconnection prediction method including.
  8. 　コンピュータを、
    　接続されたケーブルから外部負荷に出力される電流と、前記外部負荷と前記ケーブルとに印加される電圧とに基づいて、前記外部負荷及び前記ケーブルの抵抗値を算出する抵抗値算出部、
    　前記ケーブルが前記外部負荷に最初に接続された時期に算出された前記抵抗値の初期値である抵抗初期値と、前記ケーブルが前記外部負荷に最初に接続されてから予め定めた期間が経過した時期に算出された前記抵抗値である抵抗経過値とに基づいて、前記ケーブルが断線する時期である断線時期を算出する断線時期算出部、
    　前記断線時期を出力する断線時期出力部、
    　として機能させるプログラム。     computer,
    a resistance value calculation unit that calculates resistance values of the external load and the cable based on a current output to the external load from the connected cable and a voltage applied to the external load and the cable;
    an initial resistance value that is an initial value of the resistance value calculated at the time when the cable was first connected to the external load, and a predetermined period of time that has elapsed since the cable was first connected to the external load. a breakage time calculation unit that calculates a breakage time, which is the time when the cable breaks, based on a resistance elapsed value, which is the resistance value calculated at the time;
    a wire breakage time output unit that outputs the wire breakage time;
    A program that functions as
PCT/JP2022/033430 2022-09-06 2022-09-06 Analog current output device, fa system, break prediction device, break prediction method, and program WO2024052994A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62288485A (en) * 1986-06-06 1987-12-15 三菱電機株式会社 Cable-deterioration detector
JPH01262080A (en) * 1988-04-12 1989-10-18 Toyota Auto Body Co Ltd Method and device for measuring resistance between cables of welding secondary cable and disconnection preview method utilizing method thereof
JPH0523153U (en) * 1991-09-09 1993-03-26 三菱電機株式会社 Automatic wiring inspection device
JPH11192551A (en) * 1997-12-26 1999-07-21 Daihen Corp Method for predicting progression of disconnection of secondary cable strand for welding
US20160140836A1 (en) * 2013-05-17 2016-05-19 Minimax Gmbh & Co. Kg Method and device for measuring a line resistance of control lines in hazard warning and control systems

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62288485A (en) * 1986-06-06 1987-12-15 三菱電機株式会社 Cable-deterioration detector
JPH01262080A (en) * 1988-04-12 1989-10-18 Toyota Auto Body Co Ltd Method and device for measuring resistance between cables of welding secondary cable and disconnection preview method utilizing method thereof
JPH0523153U (en) * 1991-09-09 1993-03-26 三菱電機株式会社 Automatic wiring inspection device
JPH11192551A (en) * 1997-12-26 1999-07-21 Daihen Corp Method for predicting progression of disconnection of secondary cable strand for welding
US20160140836A1 (en) * 2013-05-17 2016-05-19 Minimax Gmbh & Co. Kg Method and device for measuring a line resistance of control lines in hazard warning and control systems

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