WO2016170570A1 - Automate programmable industriel et unité de traitement informatique - Google Patents

Automate programmable industriel et unité de traitement informatique Download PDF

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Publication number
WO2016170570A1
WO2016170570A1 PCT/JP2015/061980 JP2015061980W WO2016170570A1 WO 2016170570 A1 WO2016170570 A1 WO 2016170570A1 JP 2015061980 W JP2015061980 W JP 2015061980W WO 2016170570 A1 WO2016170570 A1 WO 2016170570A1
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WIPO (PCT)
Prior art keywords
analog
digital
unit
digital value
conversion
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PCT/JP2015/061980
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English (en)
Japanese (ja)
Inventor
宏樹 塩谷
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三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to CN201580004632.8A priority Critical patent/CN106258005B/zh
Priority to KR1020167018468A priority patent/KR101701691B1/ko
Priority to JP2016506926A priority patent/JP6005322B1/ja
Priority to PCT/JP2015/061980 priority patent/WO2016170570A1/fr
Priority to TW105111206A priority patent/TWI595336B/zh
Publication of WO2016170570A1 publication Critical patent/WO2016170570A1/fr

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/21—Pc I-O input output
    • G05B2219/21137—Analog to digital conversion, ADC, DAC

Definitions

  • the present invention relates to a programmable logic controller system and an arithmetic unit having a programmable logic controller including an analog input unit that converts an analog value into a digital value and an analog output unit that converts a digital value into an analog value.
  • the present invention has been made in view of the above, and an object thereof is to obtain a programmable logic controller system capable of diagnosing analog-digital conversion processing or digital-analog conversion processing without using a dedicated circuit for diagnosis.
  • the present invention includes an analog output unit that performs digital-analog conversion and a diagnostic digital value storage that stores the first digital value, and performs analog-digital conversion.
  • the digital value setting processing unit and the second digital value after the first digital value is converted from analog to digital by the analog output unit and then converted from analog to digital by the analog input unit must match the first digital value.
  • the present invention further includes a switching device that switches whether an analog signal is input from an external device to the analog input unit or an analog value obtained by digital-analog conversion of the first digital value is input from the analog output unit.
  • the programmable logic controller system according to the present invention has an effect that diagnosis of analog-digital conversion processing or diagnosis of digital-analog conversion processing can be performed without using a dedicated circuit for diagnosis.
  • FIG. 1 The figure which shows the structure of the programmable logic controller system concerning Embodiment 1 of this invention.
  • FIG. 1 The figure which shows the hardware constitutions of the arithmetic unit of the programmable logic controller concerning Embodiment 1.
  • FIG. 1 The figure which shows the structure of the output unit of the programmable logic controller concerning Embodiment 1.
  • FIG. The figure which shows the hardware constitutions of the output unit of the programmable logic controller concerning Embodiment 1.
  • the flowchart which shows the flow of the analog-digital conversion diagnostic process of the programmable logic controller concerning Embodiment 1
  • FIG. 2 The figure which shows the structure of the programmable logic controller system concerning Embodiment 2 of this invention.
  • the figure which shows the hardware constitutions of the analog output unit of the programmable logic controller concerning Embodiment 3. 10 is a flowchart showing a flow of a digital / analog conversion diagnosis process of a programmable logic controller according to a third embodiment;
  • FIG. 1 is a diagram illustrating a configuration of a programmable logic controller system according to a first embodiment of the present invention.
  • the programmable logic controller system 100 executes a control program to process an analog signal input from the external device 30, and whether to input an analog signal from the external device 30 to the programmable logic controller 10. And a relay 20 for switching.
  • the programmable logic controller 10 includes an analog input unit 11 that converts an analog value input as an analog signal into a digital value by analog-digital conversion, and an analog output that converts a digital value input as a digital signal into an analog value through digital-analog conversion.
  • An output unit that outputs to the relay 20 a control signal for switching whether to input an analog signal from the external device 30 to the analog input unit 11 or from the analog output unit 12; 14, a power supply unit 15 that supplies power to each unit, and a base unit 16 that connects the units to each other.
  • the output unit 14 and the relay 20 determine whether an analog signal from the external device 30 is input to the analog input unit 11 or an analog value obtained by digital-analog conversion of a first digital value described later from the analog output unit 12.
  • a switching device for switching is configured.
  • FIG. 2 is a diagram illustrating a configuration of an arithmetic unit of the programmable logic controller according to the first embodiment.
  • the arithmetic unit 13 is an analog / digital conversion diagnosis processing unit 131 for diagnosing the analog / digital conversion function, and obtains a diagnostic digital value that is a first digital value for analog / digital conversion diagnosis from the analog input unit 11.
  • the relay control processing unit 134 constitutes a switching control unit that controls the switching device.
  • the relay 20 alternatively inputs the analog signal output from the external device 30 and the analog signal output from the analog output unit 12 to the analog input unit 11. That is, when the relay control processing unit 134 sends a command to the output unit 14, a control signal is output from the output unit 14 to the relay 20, and an analog signal output from the external device 30 is input to the analog input unit 11. Whether the analog signal output from the analog output unit 12 is input to the analog input unit 11 is switched.
  • FIG. 3 is a diagram illustrating a hardware configuration of the arithmetic unit of the programmable logic controller according to the first embodiment.
  • the arithmetic unit 13 includes an arithmetic device 135 that executes a ladder program or a function block, a memory 136 that the arithmetic device 135 uses for a work area, and a storage device 137 that stores the program.
  • a CPU Central Processing Unit
  • a RAM Random Access Memory
  • a nonvolatile semiconductor memory can be applied to the storage device 137.
  • the analog-digital conversion diagnostic processing unit 131, the diagnostic digital value acquisition unit 132, the diagnostic digital value setting processing unit 133, and the relay control processing unit 134 illustrated in FIG. 2 are configured so that the arithmetic unit 135 uses the memory 136 as a work area. Realized by running software. A plurality of arithmetic devices and a plurality of memories may cooperate to execute the above function.
  • FIG. 4 is a diagram illustrating a configuration of an analog input unit of the programmable logic controller according to the first embodiment.
  • the analog input unit 11 includes an analog-digital conversion unit 111 that converts an analog value into a digital value, a diagnostic digital value storage unit 112 that stores a diagnostic digital value that is a digital value for analog-digital conversion diagnosis, and analog-digital conversion
  • a diagnostic abnormality display unit 113 that displays an abnormality when a diagnostic result of the function is abnormal, and a diagnostic digital value generation unit 118 that generates a diagnostic digital value based on the input range of the analog input unit 11 are provided.
  • the input range here is a value that an analog signal input to the analog input unit 11 can take.
  • a diagnostic digital value may be generated by a device different from the analog input unit 11 and stored in the diagnostic digital value storage unit 112. If the digital value for diagnosis is generated by a device different from the analog input unit 11, the configuration of the analog input unit 11 can be simplified.
  • FIG. 5 is a diagram illustrating a hardware configuration of the analog input unit of the programmable logic controller according to the first embodiment.
  • the analog input unit 11 includes an arithmetic device 114 that executes firmware, a memory 115 that the arithmetic device 114 uses as a work area, a storage device 116 that stores firmware, and a display device 117 that displays information.
  • a CPU can be applied to the arithmetic device 114.
  • a RAM can be applied to the memory 115.
  • a nonvolatile semiconductor memory can be applied to the storage device 116.
  • An LED (Light Emitting Diode) lamp can be applied to the display device 117.
  • the arithmetic unit 114 are realized by the arithmetic unit 114 executing firmware using the memory 115 as a work area. A plurality of arithmetic devices and a plurality of memories may cooperate to execute the above function. Further, the diagnostic abnormality display unit 113 shown in FIG. 4 is realized by the arithmetic device 114 controlling the lighting pattern of the display device 117.
  • FIG. 6 is a diagram illustrating a configuration of an analog output unit of the programmable logic controller according to the first embodiment.
  • the analog output unit 12 includes a digital-analog conversion unit 121 that converts a digital value into an analog value.
  • FIG. 7 is a diagram illustrating a hardware configuration of the analog output unit of the programmable logic controller according to the first embodiment.
  • the analog output unit 12 includes an arithmetic device 122 that executes firmware, a memory 123 that the arithmetic device 122 uses as a work area, and a storage device 124 that stores firmware.
  • a CPU can be applied to the arithmetic device 122.
  • a RAM can be applied to the memory 123.
  • a nonvolatile semiconductor memory can be applied to the storage device 124.
  • the digital-analog conversion unit 121 illustrated in FIG. 6 is realized by the arithmetic unit 122 executing firmware using the memory 123 as a work area.
  • a plurality of arithmetic devices and a plurality of memories may cooperate to execute the above function.
  • FIG. 8 is a diagram illustrating a configuration of an output unit of the programmable logic controller according to the first embodiment.
  • the output unit 14 includes a control signal output unit 141 that outputs a control signal to the relay 20.
  • FIG. 9 is a diagram illustrating a hardware configuration of the output unit of the programmable logic controller according to the first embodiment.
  • the output unit 14 includes an arithmetic device 142 that executes firmware, a memory 143 that the arithmetic device 142 uses as a work area, and a storage device 144 that stores firmware.
  • a CPU can be applied to the arithmetic device 142.
  • a RAM can be applied to the memory 143.
  • a nonvolatile semiconductor memory can be applied to the storage device 144.
  • the control signal output unit 141 illustrated in FIG. 8 is realized when the arithmetic device 142 uses the memory 142 as a work area and executes firmware.
  • a plurality of arithmetic devices and a plurality of memories may cooperate to execute the above function.
  • FIG. 10 is a flowchart showing a flow of analog-digital conversion diagnosis processing of the programmable logic controller according to the first embodiment.
  • the relay control processing unit 134 sends a command to the output unit 14 to cause the control signal output unit 141 to output a control signal to the relay 20, so that the output of the analog output unit 12 is input to the analog input unit 11.
  • the relay control processing unit 134 sends a command to the output unit 14 to cause the control signal output unit 141 to output a control signal to the relay 20, so that the output of the analog output unit 12 is input to the analog input unit 11.
  • step S102 the diagnostic digital value acquisition unit 132 acquires the diagnostic digital value stored in the diagnostic digital value storage unit 112 from the analog input unit 11.
  • step S103 the diagnostic digital value setting processing unit 133 sets the diagnostic digital value in the analog output unit 12.
  • step S101 since the relay 20 is controlled so that the output of the analog output unit 12 is input to the analog input unit 11, the analog value converted from the diagnostic digital value is transferred from the analog output unit 12 to the analog input unit 11. It is input and converted into a digital value by the analog-digital conversion unit 111. That is, in step S103, the diagnostic digital value, which is the first digital value, is digital-analog converted by the analog output unit 12, and then analog-digital converted by the analog input unit 11 to generate a second digital value.
  • step S104 the analog-digital conversion diagnosis processing unit 131 acquires a second digital value, which is a digital value converted by the analog-digital conversion unit 111, from the analog input unit 11.
  • step S105 the analog-digital conversion diagnosis processing unit 131 obtains the second digital value acquired from the analog input unit 11 in step S104 and the first digital value that is the diagnostic digital value acquired from the analog input unit 11 in step S102. Compare the value. If the two match, the answer is Yes in step S105, and the analog-digital conversion diagnosis process is terminated.
  • step S104 if the digital value acquired from the analog input unit 11 in step S104 and the digital value for diagnosis acquired from the analog input unit 11 in step S102 do not match, No is determined in step S105, and analog-digital conversion is performed in step S106.
  • the diagnosis processing unit 131 notifies the analog input unit 11 of a diagnosis abnormality.
  • the diagnostic abnormality display unit 113 displays the occurrence of the diagnostic abnormality on the display device 117.
  • FIG. 11 is a diagram illustrating a modification of the configuration of the programmable logic controller system according to the first embodiment.
  • a network unit 17 is mounted on the same base unit 16a as the arithmetic unit 13 '.
  • the arithmetic unit 13 ′ and the network unit 17 are supplied with power from the power supply unit 15 a.
  • the analog input unit 11 ′, analog output unit 12 ′, and output unit 14 ′ are mounted on a base unit 16 b that is different from the arithmetic unit 13 ′.
  • a network unit 18 is mounted on the base unit 16b on which the analog input unit 11 ', the analog output unit 12', and the output unit 14 'are mounted.
  • the analog input unit 11 ′, analog output unit 12 ′, output unit 14 ′, and network unit 18 are supplied with power from the power supply unit 15 b.
  • the network unit 17 and the network unit 18 are connected by a hub 19. Therefore, the analog input unit 11 ′, the analog output unit 12 ′, and the output unit 14 ′ can communicate with the arithmetic unit 13 ′ via the network unit 18, the hub 19, and the network unit 17.
  • the analog input unit 11 ′, the analog output unit 12 ′, and the communication between the output unit 14 ′ and the arithmetic unit 13 ′ are performed as a network unit. 18, except that it is performed via the hub 19 and the network unit 17, as described with reference to the flowchart of FIG. 10.
  • the communication between the analog input unit 11 ′, the analog output unit 12 ′ and the output unit 14 ′ and the arithmetic unit 13 ′ is performed via the network unit 18, the hub 19 and the network unit 17, so that the programmable logic controller 10
  • the degree of freedom of layout increases.
  • the analog-to-digital conversion diagnosis processing unit 131 converts the digital value for analog-to-digital conversion diagnosis by the digital-to-analog conversion unit 121, and further converts the digital value from the analog-to-digital conversion unit 111. If the analog value does not match the digital value for analog-digital conversion diagnosis, it is diagnosed that there is an abnormality in the analog-digital conversion function. Therefore, the analog input units 11, 11 ′ and analog output units that do not have a dedicated circuit for diagnosis 12, 12 'can be used to diagnose analog-digital conversion processing.
  • the programmable logic controller system does not require a dedicated diagnostic circuit, and can be programmed using a combination of the analog input units 11 and 11 ′ and the analog output units 12 and 12 ′ and using the diagnostic digital values. Diagnosis is performed by checking with a ladder. Therefore, the analog input units 11 and 11 'or the analog output units 12 and 12' that do not have a dedicated diagnostic circuit can be diagnosed by mounting only the firmware. Moreover, the unit unit price and development cost can be suppressed. Furthermore, since the switching device is controlled by the arithmetic units 13 and 13 ', the analog input units 11 and 11' and the analog output units 12 and 12 'do not need to have a switching device control function.
  • FIG. FIG. 12 is a diagram illustrating a configuration of a programmable logic controller system according to the second embodiment of the present invention.
  • the analog input unit 11S, the arithmetic unit 13S, the output unit 14S, the power supply unit 15S, and the base unit 16S of the programmable logic controller 10S according to the second embodiment detect a failure by self-diagnosis when a failure occurs and force a safety input. It is the same as the analog input unit 11, the arithmetic unit 13, the output unit 14, the power supply unit 15 and the base unit 16 of the first embodiment except that it has a function to turn off and corresponds to the safety standard.
  • the analog output unit 12S is the same as the analog output unit of the first embodiment.
  • the analog input unit 11S, the arithmetic unit 13S, and the output unit 14S of the second embodiment correspond to safety communication that performs self-diagnosis of a fault by performing communication with other units in duplicate and collating the communication result. ing. In safety communication, if the result of communication performed twice does not match, it is diagnosed that a failure has occurred.
  • the program executed by the arithmetic unit 13S is a safety ladder program or a safety function block corresponding to the safety standard.
  • the programmable logic controller system Since the programmable logic controller system according to the second embodiment performs safety communication between units, analog-digital conversion is performed due to a communication error when a digital value for diagnosis, an analog conversion value, or a digital conversion value is transferred between units. It is possible to prevent an error from occurring in the diagnosis result of the diagnosis.
  • FIG. FIG. 13 is a figure which shows the structure of the programmable logic controller system concerning Embodiment 3 of this invention.
  • the programmable logic controller system 101 executes a control program to output an analog signal for control to the external device 60, and whether to output an analog signal from the programmable logic controller 40 to the external device 60. And a relay 50 for switching.
  • the programmable logic controller 40 includes an analog input unit 41 that converts an analog value to a digital value by analog-digital conversion, an analog output unit 42 that converts a digital value to an analog value by digital-analog conversion, and an arithmetic unit 43 that executes a control program.
  • An output unit 44 that outputs a control signal for switching whether to output an analog signal output from the analog output unit 42 to the external device 60 or to the analog input unit 41, and to supply power to each unit.
  • the power supply unit 45 and the base unit 46 which connects each unit mutually are provided.
  • the output unit 44 and the relay 50 determine whether to output an analog signal from the analog output unit 41 to the external device 60, or to output an analog value obtained by digital-analog conversion of a third digital value described later to the analog input unit 41.
  • a switching device for switching is configured.
  • FIG. 14 is a diagram illustrating a configuration of an arithmetic unit of the programmable logic controller according to the third embodiment.
  • the arithmetic unit 43 obtains a digital value for diagnosis from a digital / analog conversion diagnosis processing unit 431 for diagnosing a digital / analog conversion function and a digital value for diagnosis which is a third digital value for digital / analog conversion diagnosis from the analog output unit 42.
  • a relay control processing unit 434 that causes the output unit 44 to switch between the unit 432 and the relay 50.
  • the relay control processing unit 434 constitutes a switching control unit that controls the switching device.
  • the hardware configuration of the arithmetic unit 43 of the programmable logic controller 40 according to the third embodiment is the same as that of the first embodiment.
  • the digital-to-analog conversion diagnostic processing unit 431, the diagnostic digital value acquisition unit 432, and the relay control processing unit 434 illustrated in FIG. 14 are implemented by executing software using a memory as a work area. A plurality of arithmetic devices and a plurality of memories may cooperate to execute the above function.
  • FIG. 15 is a diagram illustrating a configuration of an analog input unit of the programmable logic controller according to the third embodiment.
  • the analog input unit 41 includes an analog-digital conversion unit 411 that converts an analog value into a digital value.
  • FIG. 16 is a diagram illustrating a hardware configuration of an analog input unit of the programmable logic controller according to the third embodiment.
  • the analog input unit 41 includes an arithmetic device 412 that executes firmware, a memory 413 that the arithmetic device 412 uses as a work area, and a storage device 414 that stores firmware.
  • a CPU can be applied to the arithmetic device 412.
  • a RAM can be applied to the memory 413.
  • a nonvolatile semiconductor memory can be applied to the memory device 414.
  • the analog-digital conversion unit 411 illustrated in FIG. 15 is realized by the arithmetic device 412 using the memory 413 as a work area and executing firmware.
  • a plurality of arithmetic devices and a plurality of memories may cooperate to execute the above function.
  • FIG. 17 is a diagram illustrating a configuration of an analog output unit of the programmable logic controller according to the third embodiment.
  • the analog output unit 42 includes a digital-analog conversion unit 421 that converts a digital value into an analog value, a diagnostic digital value storage unit 422 that stores a diagnostic digital value that is a third digital value for digital-analog conversion diagnosis, When the diagnosis result of the digital-analog conversion function is abnormal, a diagnostic abnormality display unit 423 that displays abnormality, and a diagnostic digital value generation unit 428 that generates a diagnostic digital value based on the output range of the analog output unit 42 With.
  • the output range here is a value that an analog signal output from the analog output unit 42 can take.
  • the diagnostic digital value may be generated by a device different from the analog output unit 42 and stored in the diagnostic digital value storage unit 422. If the diagnostic digital value is generated by a device different from the analog output unit 42, the configuration of the analog output unit 42 can be simplified.
  • FIG. 18 is a diagram illustrating a hardware configuration of the analog output unit of the programmable logic controller according to the third embodiment.
  • the analog output unit 42 includes an arithmetic device 424 that executes firmware, a memory 425 that the arithmetic device 424 uses as a work area, a storage device 426 that stores firmware, and a display device 427 that displays information.
  • a CPU can be applied to the arithmetic device 424.
  • a RAM can be applied to the memory 425.
  • a nonvolatile semiconductor memory can be used for the memory device 426.
  • An LED lamp can be applied to the display device 427.
  • the arithmetic unit 424 executing firmware using the memory 425 as a work area.
  • a plurality of arithmetic devices and a plurality of memories may cooperate to execute the above function.
  • the diagnostic abnormality display unit 423 illustrated in FIG. 17 is realized by the arithmetic device 424 controlling the lighting pattern of the display device 427.
  • the configuration of the output unit 44 of the programmable logic controller 40 according to the third embodiment is the same as that of the output unit 14 in the first embodiment.
  • FIG. 19 is a flowchart showing the flow of the digital / analog conversion diagnosis process of the programmable logic controller according to the third embodiment.
  • the relay control processing unit 434 sends a command to the output unit 44 to output a control signal to the relay 50 so that the output of the analog output unit 42 is input to the analog input unit 41.
  • step S302 the diagnostic digital value acquisition unit 432 acquires the diagnostic digital value stored in the diagnostic digital value storage unit 422 from the analog output unit 42.
  • the analog output unit 42 converts the diagnostic digital value into an analog value by the digital-analog conversion unit 421 when the acquisition of the diagnostic digital value is requested from the diagnostic digital value acquisition unit 432 in step S302. 41 is output.
  • the analog input unit 41 converts the input analog value into a digital value by the analog / digital conversion unit 411. That is, in step S302, the digital value for diagnosis, which is the third digital value, is converted from analog to digital by the analog output unit 42, and then converted from analog to digital by the analog input unit 41 to generate a fourth digital value.
  • step S303 the digital / analog conversion diagnosis processing unit 431 acquires the fourth digital value, which is the digital value converted by the analog / digital conversion unit 411, from the analog input unit 41.
  • step S304 the digital-analog conversion diagnosis processing unit 431 performs the fourth digital value acquired from the analog input unit 41 in step S303 and the third digital value that is the diagnostic digital value acquired from the analog output unit 42 in step S302. Compare the value. If the two match, the answer is Yes in step S304, and the digital-analog conversion diagnosis process is terminated.
  • step S305 the analog output unit 42 is notified of the diagnosis abnormality.
  • the diagnostic abnormality display unit 423 displays the occurrence of the diagnostic abnormality on the display device 427. Even if the display device 427 of the analog output unit 42 notifies the occurrence of the diagnosis abnormality by displaying the diagnosis abnormality with the lighting pattern or lighting color unique to the diagnosis of the digital / analog conversion processing, there is a cause on the analog input unit 41 side. The user can recognize the possibility.
  • the digital / analog conversion diagnosis processing unit 431 converts the digital value for digital / analog conversion diagnosis by the digital / analog conversion unit 421 and further converts the digital value by the analog / digital conversion unit 411. If the digital value for digital-analog conversion diagnosis does not match, to diagnose that there is an abnormality in the digital-analog conversion function, use an analog input unit and analog output unit that do not have a dedicated circuit for diagnosis, Diagnosis of digital / analog conversion processing can be performed. Furthermore, since the switching device is controlled by the arithmetic unit 43, the analog input unit 41 and the analog output unit 42 do not need to have a switching device control function.
  • FIG. 20 is a diagram illustrating a configuration of a programmable logic controller system according to the fourth embodiment of the present invention.
  • the analog output unit 42S, the arithmetic unit 43S, the output unit 44S, the power supply unit 45S, and the base unit 46S of the programmable logic controller 40S according to the fourth embodiment detect a failure by self-diagnosis when a failure occurs and forcibly output a safety output. It is the same as the analog output unit 42, the arithmetic unit 43, the output unit 44, the power supply unit 45, and the base unit 46 of the third embodiment, except that it has a function to turn off and corresponds to the safety standard.
  • the analog input unit 41S is the same as the analog input unit 41 of the third embodiment.
  • the analog output unit 42S, the arithmetic unit 43S, and the output unit 44S of the fourth embodiment correspond to safety communication for performing self-diagnosis of a fault by performing communication with other units in duplicate and collating the communication result. ing. In safety communication, if the result of communication performed twice does not match, it is diagnosed that a failure has occurred.
  • the program executed by the arithmetic unit 43S is a safety ladder program or a safety function block corresponding to the safety standard.
  • the communication between the units is performed by safety communication. Therefore, the digital-analog conversion is performed due to a communication error when the diagnostic digital value, the analog conversion value, or the digital conversion value is transferred between the units. It is possible to prevent an error from occurring in the diagnosis result of the diagnosis.
  • the configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

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  • Testing And Monitoring For Control Systems (AREA)

Abstract

La présente invention concerne un système à automate programmable industriel (100) pourvu d'un automate programmable industriel (10) qui comprend : une unité de sortie analogique (12) qui réalise une conversion numérique-analogique ; une unité d'entrée analogique (11) qui réalise une conversion analogique-numérique ; et une unité de traitement informatique (13) pourvue d'une unité de traitement de diagnostic de conversion analogique-numérique (131) qui diagnostique la présence d'une anomalie dans la fonction de conversion analogique-numérique si une deuxième valeur numérique, qui est obtenue en réalisant tout d'abord une conversion numérique-analogique sur une première valeur numérique au moyen de l'unité de sortie analogique (12) et ensuite en réalisant une conversion analogique-numérique sur la valeur analogique résultante au moyen de l'unité d'entrée analogique (11), n'est pas identique à la première valeur numérique. Le système à automate programmable industriel (100) est en outre pourvu d'un relais (20) qui amène l'unité d'entrée analogique (11) à commuter entre la réception d'un signal analogique provenant d'un dispositif externe (30) et la réception, de la part de l'unité de sortie analogique (12), de la valeur analogique obtenue en réalisant une conversion numérique-analogique sur la première valeur numérique.
PCT/JP2015/061980 2015-04-20 2015-04-20 Automate programmable industriel et unité de traitement informatique WO2016170570A1 (fr)

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CN201580004632.8A CN106258005B (zh) 2015-04-20 2015-04-20 可编程逻辑控制器系统以及运算单元
KR1020167018468A KR101701691B1 (ko) 2015-04-20 2015-04-20 프로그래머블 로직 컨트롤러 시스템 및 연산 유닛
JP2016506926A JP6005322B1 (ja) 2015-04-20 2015-04-20 プログラマブルロジックコントローラシステム及び演算ユニット
PCT/JP2015/061980 WO2016170570A1 (fr) 2015-04-20 2015-04-20 Automate programmable industriel et unité de traitement informatique
TW105111206A TWI595336B (zh) 2015-04-20 2016-04-11 可程式邏輯控制器系統及演算單元

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CN110658801A (zh) * 2018-06-28 2020-01-07 西门子股份公司 用于以故障安全的方式提供模拟输出值的方法和系统

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WO2020166004A1 (fr) * 2019-02-14 2020-08-20 三菱電機株式会社 Système de commande, automate programmable industriel, procédé et programme
CN114026776B (zh) * 2019-07-05 2022-07-05 三菱电机株式会社 异常诊断系统及异常诊断方法

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