WO2015162760A1 - Plcユニット及びプログラマブルロジックコントローラ - Google Patents
Plcユニット及びプログラマブルロジックコントローラ Download PDFInfo
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- WO2015162760A1 WO2015162760A1 PCT/JP2014/061582 JP2014061582W WO2015162760A1 WO 2015162760 A1 WO2015162760 A1 WO 2015162760A1 JP 2014061582 W JP2014061582 W JP 2014061582W WO 2015162760 A1 WO2015162760 A1 WO 2015162760A1
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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
- G05B19/052—Linking several PLC's
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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
- G05B19/058—Safety, monitoring
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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
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/14—Plc safety
- G05B2219/14006—Safety, monitoring in general
Definitions
- the present invention relates to a PLC unit and a programmable logic controller corresponding to a functional safety standard.
- a unit corresponding to the safety integrity level (hereinafter referred to as SIL, Safety Integrity Level) 2 in the functional safety standard of IEC61508 has a system tolerance against failure (hereinafter referred to as HFT, Hardware Fault Tolerance).
- HFT Hardware Fault Tolerance
- SFF Safe Failure Fraction
- the unit corresponding to SIL2 needs to have an SFF of 60% or more.
- the HFT of 0 means that the system function is lost due to a failure of one system function.
- HFT of 1 means that the system function is lost due to two system functions failing.
- a unit corresponding to SIL3 that requires higher safety than SIL2 needs to have an SFF of 99% or more when HFT is 0. Further, a unit corresponding to SIL3 needs to have an SFF of 90% or more when HFT is 1, and needs an SFF of 60% or more when HFT is 2. HFT of 2 means that the system function is lost when three system functions fail.
- units of SFF 90% or more and less than 99% are not compliant with SIL3 by themselves, but can be compliant with SIL3 by using two units in duplicate.
- units of SFF 90% or more and less than 99% cannot support SIL3 in HFT0, but can support SIL3 by using HFT1.
- Patent Document 1 discloses that an input / output device corresponding to SIL2 is made independent to make it compatible with SIL3.
- a programmable logic controller configured by combining a CPU unit, an input unit and an output unit
- the input unit and the output unit do not have a master function for exchanging information with units other than the CPU unit.
- a programmable logic controller is configured by duplication
- all operations for collating input signals and output signals of each unit must be performed by the CPU unit, resulting in poor response performance. If the response performance is lowered, the safety distance becomes longer and the safety cannot be maintained. Therefore, when a programmable logic controller corresponding to SIL3 is constructed by duplicating a unit corresponding to SIL2, applicable applications are limited.
- a CPU unit, an input unit, an output unit, and the like are collectively referred to as a PLC unit.
- Patent Document 1 increases the safety level of a system by duplicating an input / output device, but based on the same idea as the input / output device of Patent Document 1, a unit corresponding to SIL2 is simply duplexed to be a programmable logic controller. If only the above is constructed, there is a problem that the use is limited as described above.
- the present invention has been made in view of the above, and it is possible to cope with SIL2 and SIL3 without increasing the load of the CPU unit or increasing the reliability and redundancy of each unit.
- An object is to obtain a unit and a programmable logic controller.
- the present invention is a PLC unit that is mounted on a base having a system bus and forms a programmable logic controller together with other PLC units, and is mounted on the base.
- a system bus interface function unit that directly transmits / receives data to / from another PLC unit via a system bus
- a duplex setting holding unit that retains settings for use alone or in combination with another PLC unit
- a system bus interface function A setting that includes an information collation unit that collates processed information acquired from another PLC unit that is a duplexing partner through the unit and processed information acquired by internal processing, and is used by duplicating with another PLC unit.
- the processed information is sent to another PLC unit or safety output device that is different from the duplexing partner that processes the processed information. If the verification results do not match, the process proceeds to a safe state and the output is stopped. It is characterized by that.
- the PLC unit and the programmable logic controller according to the present invention have the effect of being able to cope with SIL2 and SIL3 without increasing the load on the CPU unit or increasing the reliability and redundancy of each unit. .
- FIG. 1 is a diagram showing a configuration of an embodiment of a programmable logic controller using a PLC unit according to the present invention.
- FIG. 2 is a diagram showing the configuration of the base.
- FIG. 3 is a diagram showing the configuration of the CPU unit.
- FIG. 4 is a diagram illustrating the configuration of the input unit.
- FIG. 5 is a diagram illustrating a configuration of the output unit.
- FIG. 6 is a diagram illustrating an example of a system configuration display screen in the engineering tool.
- FIG. 7 is a diagram illustrating an example of the SIL setting screen.
- FIG. 8 is a diagram illustrating another configuration of the programmable logic controller using the PLC unit according to the embodiment.
- FIG. 9 is a diagram showing a flow of operation of the input unit.
- FIG. 1 is a diagram showing a configuration of an embodiment of a programmable logic controller using a PLC unit according to the present invention.
- FIG. 2 is a diagram showing the configuration of the base.
- FIG. 10 is a diagram showing a flow of operation of the CPU unit.
- FIG. 11 is a diagram illustrating a flow of operation of the output unit.
- FIG. 12 is a diagram illustrating a configuration of a programmable logic controller in which an input unit and an output unit that do not have a master function are duplexed to correspond to SIL3.
- FIG. 13 is a diagram illustrating a configuration of a programmable logic controller that is compliant with SIL3 using a unit that is compliant with SIL3 alone.
- FIG. 14 is a diagram illustrating an example of a configuration of a programmable logic controller using an extension base.
- FIG. 1 is a diagram showing a configuration of an embodiment of a programmable logic controller using a PLC unit according to the present invention.
- the programmable logic controller 10 includes a base 1, a CPU unit 2, an input unit 3, and an output unit 4.
- the CPU unit 2 executes the sequence program based on the input value input from the input unit 3 to generate an output value, and outputs the generated output value to the output unit 4.
- the input unit 3 receives an input signal from the safety input device 5 and outputs an input value that is a value indicated by the input signal to the CPU unit 2.
- the output unit 4 receives the output value from the CPU unit 2 and outputs it as an output signal to the safety output device 6.
- the safety input device 5 is an external device that can be connected to the input unit 3 and transmits an input signal to the input unit 3.
- the safety input device 5 is an emergency stop button or a light curtain.
- the safety output device 6 is an external device that can be connected to the output unit 4 and receives an output signal from the output unit 4.
- the safety output device 6 is a safety relay, a connector, a safety function-equipped drive device, or the like.
- Each of the CPU unit 2, the input unit 3, and the output unit 4 has an SFF of 90% or more. Therefore, the programmable logic controller 10 corresponds to SIL2.
- FIG. 2 is a diagram showing the structure of the base.
- the base 1 includes a logic circuit 11, a plurality of slots 12, and a system bus 13 that connects the plurality of slots 12.
- FIG. 3 is a diagram showing the configuration of the CPU unit.
- the CPU unit 2 includes an SIL setting holding unit 21, an input value receiving unit 22, a program executing unit 23, an operation result checking unit 24, an output value transmitting unit 25, and a system bus interface function unit (hereinafter referred to as a system bus I / F function unit). 26).
- the system bus I / F function unit 26 includes a bus master 261.
- the SIL setting holding unit 21 is a duplex setting holding unit that holds a setting as to which of SIL2 and SIL3 is to be used, that is, a setting of whether to use alone or to be used redundantly with another CPU unit.
- the input value receiving unit 22 receives the input value transmitted from the input unit 3.
- the program execution unit 23 executes a sequence program based on the input value received by the input value reception unit 22 and generates an output value.
- the calculation result checking unit 24 checks the calculation result with the other CPU units 2 that are multiplexed.
- the output value transmission unit 25 transmits the calculation result as an output value to the output unit 4.
- the system bus I / F function unit 26 is an interface for transmitting and receiving information through the system bus 13.
- the bus master 261 has a function of exchanging information with any other unit connected to the system bus 13.
- FIG. 4 is a diagram showing the configuration of the input unit.
- the input unit 3 includes a SIL setting holding unit 31, an input signal receiving unit 32, an input value collating unit 33, an input value transmitting unit 34, and a system bus I / F function unit 35.
- the system bus I / F function unit 35 includes a bus master 351.
- the SIL setting holding unit 31 is a duplex setting holding unit that holds a setting as to which of SIL2 and SIL3 is to be used, that is, a setting of whether to use alone or to be used in combination with another input unit.
- the input signal receiving unit 32 receives an input signal from the safety input device 5.
- the input value collating unit 33 collates the input value with another multiplexed input unit 3.
- the input value transmission unit 34 transmits an input signal as an input value to the CPU unit 2.
- the system bus I / F function unit 35 is an interface for transmitting and receiving information through the system bus 13.
- the bus master 351 has a function of exchanging information with any other unit connected to the system bus 13.
- FIG. 5 is a diagram showing the configuration of the output unit.
- the output unit 4 includes a SIL setting holding unit 41, an output value receiving unit 42, an output value collating unit 43, an output signal transmitting unit 44, and a system bus I / F function unit 45.
- the system bus I / F function unit 45 includes a bus master 451.
- the SIL setting holding unit 41 is a duplex setting holding unit that holds a setting as to which of SIL2 and SIL3 is to be used, that is, a setting of whether to use alone or to be used in combination with another output unit.
- the output value receiving unit 42 receives an output value from the CPU unit 2.
- the output value collation unit 43 collates output values with the other output units 4 that are multiplexed.
- the output signal transmission unit 44 transmits the output value as an output signal to the safety output device 6.
- the system bus I / F function unit 45 is an interface for transmitting and receiving information through the system bus 13.
- the bus master 451 has a function of exchanging information with any other unit connected to the system bus 13.
- a CPU unit 2 and an input unit 3 and an output unit 4 which are controlled units are mounted on the base 1.
- the bus masters 261, 351, 451 of the CPU unit 2, the input unit 3, and the output unit 4 have a master function capable of transmitting an access request command to all units on the base 1.
- the logic circuit 11 reads the access request command and sends a select signal to the output unit 4 that is the access destination. Send.
- the output unit 4 that has received the select signal returns a response to the input unit 3 through the system bus 13.
- the CPU unit 2, the input unit 3, and the output unit 4 constituting the programmable logic controller 10 store information indicating that the setting is SIL 2, in other words, information indicating that the setting is used alone, in the SIL setting holding units 21, 31, and 41. keeping.
- a method of switching between a setting corresponding to SIL2 and a setting corresponding to SIL3 in other words, a method of switching between a setting used alone and a setting used redundantly, an engineering tool is connected to the programmable logic controller 10 and changed. It is possible to apply a method and a method of providing a setting switching switch or an external pin in each unit.
- FIG. 6 is a diagram showing an example of a system configuration display screen in the engineering tool.
- a system indicating which PLC unit is connected to each of the plurality of slots 12 provided in the base 1 on the system configuration screen 71 of the engineering tool Configuration information is created by a user input operation.
- FIG. 7 is a diagram showing an example of the SIL setting screen, and shows a state in which the PLC unit connected to the slot 12 with the slot number 0 surrounded by a broken line is selected.
- a selection dialog 81 provided with a radio button 82 corresponding to SIL2 and a radio button 83 corresponding to SIL3 is displayed on the system configuration screen 71 as an SIL setting screen.
- the SIL setting of each PLC unit held in the engineering tool is transferred from the engineering tool to the programmable logic controller 10 when a write operation to the programmable logic controller 10 is performed on the engineering tool. Thereby, the SIL setting set on the engineering tool is reflected in each PLC unit.
- the programmable logic controller 10 is configured by connecting its own system configuration information to a device memory (not shown) of the programmable logic controller 10, that is, what PLC unit is connected to each of the plurality of slots 12 of the base 1.
- the engineering tool stores a device memory (not shown) of the programmable logic controller 10.
- the system configuration information may be read out from the above and the system configuration of the programmable logic controller 10 may be displayed on the system configuration screen.
- FIG. 8 is a diagram illustrating another configuration of the programmable logic controller using the PLC unit according to the embodiment.
- the programmable logic controller has a base 1, a CPU unit 2 (2 1 , 2 2 ), an input unit 3 (3 1 , 3 2 ), and an output unit 4 (4 1 , 4 2 ).
- the two CPU units 2 have the same configuration, they are described by adding a suffix to the reference numerals like the CPU unit 2 1 and the CPU unit 2 2 so that they can be distinguished from each other. .
- each configuration is the same as that of the CPU unit 2 shown in FIG.
- the CPU units 2 1 and 2 2 , the input units 3 1 and 3 2, and the output units 4 1 and 4 2 are duplexed.
- Each of the CPU units 2 1 and 2 2 , the input units 3 1 and 3 2, and the output units 4 1 and 4 2 has an SFF of 90% or more. Since each of the CPU units 2 1 and 2 2 , the input units 3 1 and 3 2 and the output units 4 1 and 4 2 are duplicated and the HFT is 1, the programmable logic controller 10 corresponds to the SIL 3. Yes.
- the CPU units 2 1 , 2 2 , the input units 3 1 , 3 2 and the output units 4 1 , 4 2 constituting the programmable logic controller 10 are used to indicate that the setting is SIL3, in other words, to be used in duplicate.
- the information shown is held in the SIL setting holding units 21, 31, 41.
- FIG. 9 is a diagram showing an operation flow of the input unit.
- the input signal receiving unit 32 receives an input signal from the safety input device 5 (step S100).
- the input value transmission unit 34 checks whether the information held in the SIL setting holding unit 31 indicates SIL2 or SIL3 (step S101). When the information held in the SIL setting holding unit 31 indicates SIL2 (step S101 / SIL2), the input value transmitting unit 34 sends an input value to one CPU unit 2 through the system bus I / F function unit 35. Transmit (step S102).
- the input value matching unit 33 passes through the system bus I / F function unit 35 and the other input unit that is the other party of duplexing.
- the input value is exchanged by acquiring the input value from 3 and transmitting the input value received from the input signal receiving unit 32 to the other input unit 3 (step S103).
- the system bus I / F function unit 35 includes a bus master 351 having a master function, it is possible to acquire an input value by directly sending an access request to another input unit 3 without going through the CPU unit 2.
- an arrow A indicates that the input value matching unit 33 acquires an input value from another input unit 3 through the system bus I / F function unit 35.
- the input value collating unit 33 collates the input value received from the input signal receiving unit 32 with the input value acquired from the other input unit 3 (step S104). That is, in the input unit 3, the processed information is an input value, and the input value matching unit 33 functions as an information matching unit. If the two match as a result of the collation (step S104 / OK), the input value transmission unit 34 outputs the input value to the two CPU units 2 through the system bus I / F function unit 35 (step S105). On the other hand, if the result of collation does not match (step S104 / NG), an error process is performed to shift to a safe state and turn off the output (step S106).
- the input unit 3 notifies the CPU unit 2 of the verification mismatch, and the CPU unit 2 that has received the notification from the input unit 3 transmits a stop signal to the output unit 4. By stopping the output, it is possible to shift to a safe state and turn off the output.
- the input unit 3 When the information held in the SIL setting holding unit 31 indicates SIL3, the input unit 3 is duplicated with the other input units 3, so that the two input units 3 mutually input values to the other input unit. 3, collation is performed, and when the collation results of both input units 3 match, the input value transmission unit 34 transmits the input value to the CPU unit 2.
- acquisition and collation of the input value from the other input unit 3 are performed by both of the two input units 3, transmission of the input value to the CPU unit 2 may be performed by only one of them.
- FIG. 10 is a diagram showing an operation flow of the CPU unit.
- the input value receiving unit 22 receives an input value from the input unit 3 (step S200). Thereafter, the program execution unit 23 executes the sequence program and generates an output value (step S201).
- the output value transmitting unit 25 confirms whether the information held in the SIL setting holding unit 21 indicates SIL2 or SIL3 (step S202). When the information held in the SIL setting holding unit 21 indicates SIL2 (step S202 / SIL2), the output value transmission unit 25 outputs the output value to one output unit 4 through the system bus I / F function unit 26. Transmit (step S203).
- the operation result checking unit 24 passes the system bus I / F function unit 26 to the other CPU unit that is the other party of the duplexing.
- the calculation result is exchanged by acquiring the calculation result from 2 and transmitting the calculation result received from the program execution unit 23 to the other CPU unit 2 (step S204). Since the system bus I / F function unit 26 includes a bus master 261 having a master function, it is possible to directly send an access request to another CPU unit 2 to obtain a calculation result.
- an arrow B indicates that the calculation result checking unit 24 acquires an input value from another CPU unit 2 through the system bus I / F function unit 26.
- the operation result collation unit 24 collates the operation result received from the program execution unit 23 with the operation result acquired from the other CPU unit 2 (step S205). That is, in the CPU unit 2, the processed information is a calculation result, and the calculation result matching unit 24 serves as an information matching unit. If the two match as a result of the collation (step S205 / OK), the output value transmitting unit 25 transmits the calculation result as an output value to the two output units 4 through the system bus I / F function unit 26 (step S206). ). On the other hand, if they do not match as a result of the collation (step S205 / NG), an error process is performed to shift to a safe state and turn off the output (step S207). In this case, the CPU unit 2 transmits a stop signal to the output unit 4 and stops the output of the output unit 4, thereby shifting to a safe state and turning off the output.
- the two input units 3 mutually calculate the operation results of the other CPU unit 2. 2, collation is performed, and when the collation results of both CPU units 2 match, the output value transmission unit 25 transmits the output value to the output unit 4. Acquisition and verification of the calculation results from the other CPU units 2 are performed by both of the two CPU units 2, but only one of the output values may be transmitted to the output unit 4.
- the program may be executed using either input value.
- the program execution unit 23 is set in advance so as to execute the program using the input value received from the input unit 3 installed in the slot 12 close to the CPU unit 2 out of the two input units 3. Also good.
- FIG. 11 is a diagram showing an operation flow of the output unit.
- the output value receiving unit 42 receives an output value from the CPU unit 2 (step S300).
- the output signal transmission unit 44 confirms whether the information held in the SIL setting holding unit 41 indicates SIL2 or SIL3 (step S301).
- the output signal transmission unit 44 outputs an output signal to the safety output device 6 through the system bus I / F function unit 45. (Step S302).
- the output value matching unit 43 passes the system bus I / F function unit 45 to the other output unit that is the duplexing partner.
- the output value is exchanged by acquiring the output value from 4 and transmitting the output value received from the output value receiving unit 42 to the other output unit 4 (step S303).
- the system bus I / F function unit 45 includes a bus master 451 having a master function, it is possible to acquire an output value by directly sending an access request to another output unit 4 without going through the CPU unit 2.
- an arrow C indicates that the output value matching unit 43 acquires an output value from another output unit 4 through the system bus I / F function unit 45.
- the output value collating unit 43 collates the output value received from the output value receiving unit 42 with the output value acquired from the other output unit 4 (step S304). That is, in the output unit 4, the processed information is an output value, and the output value matching unit 43 serves as an information matching unit. If they match as a result of the collation (step S304 / OK), the output signal transmission unit 44 transmits an output signal to the safety output device 6 through the system bus I / F function unit 45 (step S302). On the other hand, if they do not match as a result of the collation (step S304 / NG), an error process is performed to shift to a safe state and turn off the output (step S305). In this case, the output unit 4 stops transmitting the output signal to the safety output device 6.
- the output signal transmission unit 44 transmits an output signal to the safety output device 6.
- acquisition and collation of the output value from the other output unit 4 are performed by both of the two output units 4, transmission of the output value to the safety output device 6 may be performed by only one of them.
- either output value may be used for collation.
- the output value collation unit 43 may be set in advance so as to collate using the output value received from the CPU unit 2 installed in the slot close to the output unit 4. good.
- the input unit 3 and the output unit 4 are mixed with those set in SIL2 and those set in SIL3, the respective units operate as set.
- the programmable logic controller 10 as the entire system corresponds to SIL2 in terms of safety standards.
- FIG. 12 is a diagram illustrating a configuration of a programmable logic controller in which an input unit and an output unit that do not have a master function are duplexed to correspond to SIL3.
- the programmable logic controller 110 includes one CPU unit 102 that executes a program, two input units 103 that receive an input signal from the safety input device 105, and two output units 104 that output an output signal to the safety output device 106. Mounted on the base 101. In the SFF, the CPU unit 102 that is not duplexed is 90% or more, and the input unit 103 and the output unit 104 that are duplexed is 60% or more.
- each input unit 103 receives an input signal from the safety input device 105 and sends the signal to the CPU unit 102.
- the CPU unit 102 collates the input values received from the respective input units 103, executes the program if they match, and outputs the output values to the respective output units 104.
- Each output unit 104 sends the output value received from the CPU unit 102 to the CPU unit 102 and requests collation.
- the output unit 104 outputs an output value to the safety output device 106 when “match” is notified from the CPU unit 102 as a collation result.
- the output is turned off by shifting to a safe state in any case.
- a CPU unit 102 and an input unit 103 and an output unit 104 which are controlled units are mounted on the base 101. Only the CPU unit 102 has a master function capable of transmitting an access request command to all units on the base 101. On the other hand, since the input unit 103 and the output unit 104 which are controlled units are slaves of the CPU unit 102, an access request command cannot be transmitted to the CPU unit 102 or other controlled units.
- the logic circuit reads the access request command and transmits a select signal to the controlled unit that is the access destination.
- the controlled unit to be accessed is specifically the input unit 103 or the output unit 104.
- the controlled unit that has received the select signal returns a response to the CPU unit 102 through the bus.
- the programmable logic controller 110 that duplexes each of the input unit 103 and the output unit 104 that do not have a master function and the CPU unit 102 that has the master function and supports SIL3 sends an access request command to the controlled unit
- the CPU unit 102 collates signals and output values.
- the programmable logic controller 110 in which only the CPU unit 102 has the master function, since the CPU unit 102 collates the input value and the output value every time, the response performance is deteriorated. If the response performance is lowered, the safety distance becomes longer and the safety cannot be maintained. Therefore, even if the programmable logic controller 110 is adapted to SIL3 that requires higher safety than SIL2, applicable applications are limited. .
- the unit corresponding to SIL3 needs to have 99% or more of SFF when HFT is 0. In other words, when making it correspond to SIL3 alone without duplication, the SFF of the unit needs to be 99% or more. Further, a unit corresponding to SIL3 needs to have an SFF of 90% or more when HFT is 1, and needs an SFF of 60% or more when HFT is 2.
- FIG. 13 is a diagram showing a configuration of a programmable logic controller that is made compatible with SIL3 by using a unit that supports SIL3 alone.
- the programmable logic controller 210 includes a CPU unit 202 that executes a program, an input unit 203 that receives an input signal from the safety input device 205, and an output unit 204 that outputs an output signal to the safety output device 206.
- the input unit 203 and the output unit 204 are duplicated inside.
- the CPU unit 202 that is not duplexed is 99% or more
- the input unit 203 and output unit 204 that are duplexed inside is 90% or more.
- the input unit 203 receives an input signal from the safety input device 205 in each of the duplex receiving units 2031a and 2031b.
- the input unit 203 collates the input signals received by the receiving units 2031a and 2031b through the internal bus, and outputs an input value to the CPU unit 202 if they match.
- the CPU unit 202 executes a program and outputs an output value to the output unit 204.
- the output unit 204 receives the output value in each of the duplexed transmission units 2041a and 2041b, collates the output value received in each transmission unit 2041a and 2041b through the internal bus, and if they match, outputs the output signal to the safety output device 206. Send.
- the output is turned off by shifting to a safe state in any case.
- the programmable logic controller 210 is a unit corresponding to SIL3, if a system corresponding to SIL2 is constructed using these units, the reliability and redundancy of each unit becomes excessive, and the cost required for system construction Becomes higher.
- the programmable logic controller according to the present embodiment since the programmable logic controller according to the present embodiment has a master function for each of the CPU unit, the input unit, and the output unit, data can be exchanged without using the CPU unit. Therefore, even when the input signal and the output value are collated with duplication, the load on the CPU unit does not increase and the response performance can be prevented from deteriorating. For this reason, the unit for the system compatible with SIL2 and the unit for the system compatible with SIL3 can be shared.
- FIG. 14 is a diagram illustrating an example of a configuration of a programmable logic controller using an extension base.
- the base 301 0, CPU units 302 0, 302 0, the input unit 303 0, 303 0, output units 304 0, 304 0 is implemented.
- the base 301 0, m-number of extension base 301 1 ⁇ 301 m (m is an arbitrary natural number) is connected.
- the expansion bases 301 1 to 301 m include a CPU unit 302 1 , 302 1 to 302 m , 302 m , an input unit 303 1 , 303 1 to 303 m , 303 m , and an output unit 304 1 , 304 1 to 304 m , 304. Each m is implemented.
- the CPU unit, the input unit, and the output unit according to the present embodiment can also configure a programmable logic controller using an extension base.
- the unit is used alone corresponds to the safety standard of SIL2 and the unit is used redundantly to correspond to the safety standard of SIL3.
- the unit is used alone. If it is possible to correspond to two types of safety standards depending on whether it is used or doubled, it is not limited to SIL2 and SIL3.
- ISO 13849-1 corresponds to safety category 2 when a unit with one input / output channel is used independently, and a safety category when two units with one input / output channel are used in duplicate.
- the present invention can also be applied to a case corresponding to the standard of ISO 13849-1.
- the CPU unit, the input unit, the output unit, and the programmable logic controller according to the present invention can be applied to SIL2 and SIL3 without increasing the load on the CPU unit or excessively increasing the reliability and redundancy of each unit. This is useful in that it can be handled.
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Abstract
Description
図1は、本発明にかかるPLCユニットを用いたプログラマブルロジックコントローラの実施の形態の構成を示す図である。プログラマブルロジックコントローラ10は、ベース1、CPUユニット2、入力ユニット3及び出力ユニット4を有する。
Claims (6)
- システムバスを備えたベースに装着されて、他のPLCユニットとともにプログラマブルロジックコントローラを構成するPLCユニットであって、
前記ベースに装着された他のPLCユニットと前記システムバスを通じてデータを直接送受信するシステムバスインタフェース機能部と、
単独で用いるか他のPLCユニットと二重化させて用いるかの設定を保持する二重化設定保持部と、
前記システムバスインタフェース機能部を通じて二重化の相手である他のPLCユニットから取得した処理済み情報と内部での処理で取得した処理済み情報とを照合する情報照合部とを有し、
前記他のPLCユニットと二重化させて用いる設定がなされている場合には、前記情報照合部での照合結果が一致である場合に前記処理済み情報を、該処理済み情報を処理する二重化の相手とは異なる他のPLCユニット又は安全出力機器へ送信し、前記照合結果が不一致である場合にはエラー処理を行うことを特徴とするPLCユニット。 - 単独で用いることにより機能安全規格の安全インテグリティレベル2に対応し、二重化して用いることにより機能安全規格の安全インテグリティレベル3に対応することを特徴とする請求項1に記載のPLCユニット。
- 入力ユニットから受信した入力値に基づいてプログラムを実行して演算結果を生成し、該演算結果を出力値として出力ユニットへ送信するCPUユニットであり、
前記処理済み情報は、前記入力値であることを特徴とする請求項1又は2に記載のPLCユニット。 - 安全入力機器から入力信号を受信して入力値を抽出し、該入力値をCPUユニットへ送信する入力ユニットであり、
前記処理済み情報は、前記演算結果であることを特徴とする請求項1又は2に記載のPLCユニット。 - CPUユニットから受信した出力値を基に生成した出力信号を安全出力機器へ送信する出力ユニットであり、
前記処理済み情報は、前記出力値であることを特徴とする請求項1又は2に記載のPLCユニット。 - 二つの請求項3に記載のPLCユニットと、二つの請求項4に記載のPLCユニットと、二つの請求項5に記載のPLCユニットとを、システムバスを有するベースに実装したことを特徴とするプログラマブルロジックコントローラ。
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