JP5894553B2 - Control system, line connection diagnosis method and program - Google Patents

Description

  The present invention makes it possible to detect erroneous connection locations of lines connecting each device in an environment in which a redundant arithmetic device and a plurality of control devices are connected to each other by a redundant line. The present invention relates to a control system, a line connection diagnosis method, and a program.

  Conventionally, there are control systems for controlling plants such as nuclear power generation, thermal power generation, and hydropower generation. In such a control system, in order to improve the reliability of plant control, control devices such as arithmetic devices, optical repeaters, and input / output devices are duplexed, and these duplexed devices are connected by a ring system using a duplex line. It was common to operate in this way. In this control system, when one of the redundant computing devices fails, the control is quickly switched to the other normal computing device, and the control of the control target including various sensors is continued. This is very important. For this reason, when constructing a control system, a system is adopted in which two arithmetic devices are not arranged on the same ring, but are connected by an independent ring as seen from each arithmetic device.

  In Patent Document 1, a plurality of transmission apparatuses are connected in a loop using a duplexed transmission path as an active system and a standby system, and if an erroneous connection has occurred, the position of the erroneous connection is identified by identifying a connection information bit string. Techniques that enable it are disclosed.

JP 2002-341936 A

  By the way, in a large-scale control system, the total number of control devices often reaches 100 or more, and the work of connecting each control device with a line such as an optical cable becomes enormous. Furthermore, when the line is duplicated to improve the reliability of the plant control, the number of wires required for the line is doubled. In the ring system constituted by the duplexed lines, it is essential to confirm the erroneous connection of the lines before the operation of the control system in order to improve the reliability of communication.

  Conventionally, however, wiring and confirmation work of lines has been carried out by visual inspection of workers, and due to the large number of work steps, erroneous connection locations due to human errors have occurred.

  Further, when a method of ring connection independent from each arithmetic device is adopted, a frame that has passed through the misconnected line reaches a different arithmetic device from the source arithmetic device. For this reason, even if the technique disclosed in Patent Literature 1 is used, the transmission source arithmetic device cannot grasp what route the frame has taken, and can detect an erroneous connection of the line. It was insufficient.

  The present invention has been made in view of such a situation, and an object of the present invention is to facilitate the confirmation work of the lines constituting the control system.

The present invention relates to a control system including a duplicated arithmetic device and a duplicated input / output device.
The arithmetic devices are respectively ring-connected by the duplexed 1-system line and 2-system line, and output control commands to the controlled objects designated by the higher-level terminals.
The input / output device is ring-connected by the 1-system line and the 2-system line, respectively, outputs a control command received from the arithmetic device to the control target, and transmits a response result received from the control target to the arithmetic device.
The input / output device receives a control command from the arithmetic device via the system 1 line and transmits a response result to the arithmetic device, and a first system communication control unit and a first system communication controller A first 2-system communication control unit that is connected by a communication path, receives a control command from the arithmetic device via a 2-system line, and transmits a response result to the arithmetic device.
Then, the arithmetic device transmits a request frame to which the first system information for identifying the first system line or the second system line is added, with the input / output device as the destination.
The first 1-system communication control unit of the input / output device is configured when the first system information of the request frame transmitted from the arithmetic device with the input / output device as the destination indicates the 1-system line, or the first 2-system communication control When a response frame to the request frame is received from the unit via the first communication path, a response frame to which second system information for identifying the first system line or the second system line that has received the request frame is added, When the first system information indicated by the first system information is transmitted to the arithmetic unit and the first system information of the request frame indicates the second system line, the response frame is transmitted from the first communication path to the first It transmits to 2 system communication control part .
The first 2-system communication control unit of the input / output device is configured when the first system information of the request frame transmitted from the arithmetic device with the input / output device as the destination indicates a 2-system line, or the first 1-system communication control When the response frame is received from the unit via the first communication path, the response frame to which the second system information is added is transmitted to the arithmetic device via the second system line indicated by the first system information, When the first system information of the request frame indicates a system 1 line, a response frame is transmitted from the first communication path to the first system 1 communication control unit.
The terminal diagnoses normal connection or incorrect connection of the 1-system line or the 2-system line based on the response result to the request frame received from the arithmetic device.

  According to the present invention, it is possible to perform an erroneous connection diagnosis of a line by the control device, and it is possible to reduce the load of the line confirmation work by the worker.

It is a block diagram which shows the example of whole structure of the control system in the example of 1 embodiment of this invention. It is explanatory drawing which shows the structural example of the format of the frame which each apparatus in one embodiment of this invention uses in order to communicate information. It is a flowchart which shows the example of the diagnostic procedure of the line incorrect connection which the terminal in one embodiment of this invention performs. It is a flowchart which shows the process example of the arithmetic unit in one embodiment of this invention. It is a flowchart which shows the example of a process of the optical repeater in one embodiment of this invention. It is a flowchart which shows the process example of the input / output device in one embodiment of this invention. It is a block diagram which shows the operation example of the frame transmission / reception of the optical repeater at the time of the line normal connection in the example of one embodiment of this invention, and the line incorrect connection. It is a block diagram which shows the operation example of the flame | frame transmission / reception of an input / output device at the time of the line normal connection in the example of 1 embodiment of this invention, and a line incorrect connection. It is explanatory drawing which shows the structural example of the table | surface corresponding to the line incorrect connection form in one embodiment of this invention. It is explanatory drawing which shows the structural example of the table | surface corresponding to the line incorrect connection form in one embodiment of this invention. It is explanatory drawing which shows the structural example of the table | surface corresponding to the line incorrect connection form in one embodiment of this invention. It is a block diagram which shows the structural example in which the misconnection generate | occur | produced in the electric cable between the input / output device A and the input / output device B of the control system in one embodiment of this invention. It is a block diagram which shows the structural example which the misconnection generate | occur | produced in the optical cable from the optical repeaters A and B of the control system in one embodiment of this invention to the input / output device A direction. It is a block diagram which shows the structural example in which the misconnection generate | occur | produced in the optical cable from the input / output apparatus A of the control system in the example of this invention to the optical repeater A and B direction. It is a block diagram which shows the structural example in which the misconnection generate | occur | produced in the optical cable from the arithmetic unit A of the control system in one embodiment of this invention to the optical repeater A and C direction. It is a block diagram which shows the structural example in which the erroneous connection generate | occur | produced in the optical cable from the optical repeaters B and D of the control system in one embodiment of this invention to the arithmetic unit A direction.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
The control system 1 according to an embodiment of the present invention realizes a control method performed by a functional block described later in cooperation with a computer executing a program. In the present specification and drawings, components having substantially the same function or configuration are denoted by the same reference numerals, and redundant description is omitted.

FIG. 1 is a block diagram showing an example of the overall configuration of a control system 1 according to an embodiment of the present invention.
The control system 1 includes duplex terminals A2 and B2 that serve as interfaces through which an operator inputs and outputs. Each of the terminals A2 and B2 includes an operation unit, a display unit, a control unit, a communication interface, and a recording unit (not shown). A control unit composed of a CPU or the like executes a program read from the recording unit. In addition to the request frame transmitted from the arithmetic devices A3 and B3 and the response frame received from the arithmetic devices A3 and B3, an erroneous connection diagnosis matrix (see FIGS. 9 to 11 described later) is recorded in the recording unit. ing.

  The operator uses a console, such as a mouse and a keyboard, to instruct the start of an erroneous connection diagnosis, which will be described later, and to execute a program for outputting a control command to the controlled objects A6 and B6. An instruction for starting a connection error diagnosis, a control command, and the like are transmitted to the arithmetic devices A3 and B3 via the communication interface. And a control part receives the response result of control object A6, B6 from arithmetic unit A3, B3, or receives the response result with respect to a request | requirement frame. Further, the control unit diagnoses normal connection or incorrect connection of the 1-system line or the 2-system line based on the response result to the request frame. Since the response result includes information indicating that the response frame has not been received, the line connection diagnosis can be performed even when the arithmetic devices A3 and B3 cannot receive the response frame.

  The control system 1 includes arithmetic devices A3 and B3 connected to the terminals A2 and B2, respectively. Arithmetic devices A3 and B3 are ring-connected by duplexed 1-system lines L1 and L4 and 2-system lines L2 and L3, respectively, in order to improve the reliability of information to be communicated, and are instructed by higher-level terminals A2 and B2, respectively. A control command is output to the control objects A6 and B6.

  The optical repeaters A4 to D4 and the input / output devices A5 and B5 are ring-connected to the arithmetic unit A3 by a duplicated line of the 1-system line L4 and the 2-system line L3. The duplexed optical repeaters A4 and B4 are arranged between the arithmetic units A3 and B3 and the input / output device A5 and relay optical signals. The duplexed optical repeaters C4 and D4 are arranged between the arithmetic units A3 and B3 and the input / output device B5 and relay optical signals. In the relay of the optical signal performed by the optical repeaters A4 to D4, for example, a process for shaping the waveform of the optical signal is performed. The input / output devices A5 and B5 are used for outputting the control commands received from the arithmetic devices A3 and B3 to the control objects A6 and B6 and transmitting the response results received from the control objects A6 and B6 to the arithmetic devices A3 and B3. It is done.

  Here, the 1-system line L4 is a line that exits from the arithmetic device A3 and returns to the arithmetic device A3 via the optical repeater A4, the input / output devices A5 and B5, and the optical repeater D4. The 2-system line L3 is a line that exits from the arithmetic device A3 and returns to the arithmetic device A3 via the optical repeater C4, the input / output devices B5 and A5, and the optical repeater B4.

  Further, the optical repeaters A4 to D4 and the input / output devices A5 and B5 are ring-connected to the arithmetic unit B3 by a duplex line composed of the 1-system line L1 and the 2-system line L2. The 1-system line L1 is a line that exits from the arithmetic device B3 and returns to the arithmetic device B3 via the optical repeater D4, the input / output devices B5 and A5, and the optical repeater A4. The 2-system line L2 is a line that leaves the arithmetic device B3 and returns to the arithmetic device B3 through the optical repeater B4, the input / output devices A5 and B5, and the optical repeater D4.

  In the following description, when the optical repeaters A4 to D4 and the input / output devices A5 and B5 are not distinguished, they may be abbreviated as “each device”. The devices arranged in the 1-system lines L1 and L4 and the 1-system lines L1 and L4 are abbreviated as “1 system”, and the devices and the 2 system lines L2 and L3 arranged in the 2 system lines L2 and L3 are “2”. "System" may be abbreviated. Further, when the system 1 lines L1 and L4 are not distinguished, they are called “system 1 lines”, and when the system 2 lines L2 and L3 are not distinguished, they are sometimes called “system 2 lines”. Further, when the 1-system line and the 2-system line are not distinguished, they may be simply referred to as “line”.

  Each device constituting the control system 1 has an assigned unique address. For example, the arithmetic unit A3 has an address “0”, and the arithmetic unit B3 has an address “1”. The optical repeaters A4 and B4 have an address “2”, and the optical repeaters C4 and D4 have an address “5”. The input / output device A5 has an address “3”, and the input / output device B5 has an address “4”.

The lines are constituted by optical cables between the arithmetic devices A3 and B3 and the optical repeaters A4 to D4, and between the optical repeaters A4 to D4 and the input / output devices A5 and B5. Then, the 1-system communication control unit 52A included in the input / output device A5 and the 1-system communication control unit 52A included in the input / output device B5 are connected by the first electric cable or the first optical cable. In addition, the 2-system communication control unit 52B provided in the input / output device A5 and the 2-system communication control unit 52B provided in the input / output device B5 are connected by a second electric cable or a second optical cable. Since the electric cable or the optical cable may be used properly according to the situation of the place where each device is arranged, the degree of freedom of wiring increases.
In addition, you may comprise between arithmetic unit A3, B3 and input-output device A5, B5 with an electric cable. In this case, since it is not necessary to convert the optical signal into an electrical signal, the optical repeaters A4 to D4 are unnecessary from the control system 1.

  As described above, in the control system 1, the optical repeaters A4 to D4 and the input / output devices A5 and B5 are connected to the arithmetic devices A3 and B3, respectively, by independent ring-shaped lines. As a result, even if one of the arithmetic devices A3 and B3 fails, the control is immediately switched from the failed arithmetic device to the normal arithmetic device, and the normal arithmetic device inputs and outputs to the optical repeaters A4 to D4. Communication with the devices A5 and B5 can be continued at regular intervals. For this reason, it is possible to suppress the influence that the line used by the normal arithmetic device is blocked and the controlled objects A6 and B6 become uncontrollable.

  Terminals A2 and B2 can detect the presence / absence of erroneous connection of the duplexed and ring-connected lines and the location where the erroneous connection has occurred. In accordance with the instruction to start diagnosis from the upper terminals A2 and B2 of the arithmetic devices A3 and B3, the arithmetic devices A3 and B3 send the optical repeaters A4 to D4 and the input / output devices A5 and B5 to the first and second systems. Perform individual one-line communication. This destination includes different addresses (an example of position information) allocated to the redundant arithmetic devices A3 and B3, optical repeaters A4 to D4, and input / output devices A5 and B5. At this time, the arithmetic devices A3 and B3 transmit a request frame to which frame transmission information F4 (identified in FIG. 2 described later as an example of the first system information) is added to identify the system 1 or system 2 line. . The instructions from the terminals A2 and B2 are made by an explicit input operation performed by the worker. However, the diagnosis start instruction may be automatically generated at regular intervals.

  When the input / output devices A5 and B5 receive the request frame from the arithmetic devices A3 and B3, the frame reception information F5 (as an example of the second system information) for identifying the system 1 or system 2 that has received the request frame. (Shown in FIG. 2 described later) is added to the response frame. Then, the response frame is transmitted to the arithmetic devices A3 and B3 through the 1-system line or the 2-system line indicated by the first system information.

  Similarly, the optical repeaters A4 to D4 request that the calculation devices A3 and B3 add the frame transmission information F4 transmitted from the optical repeaters A4 to D4 by using either the 1-system line or the 2-system line. When the frame is received, frame reception information F5 is added to the request frame. Then, a response frame to the request frame is transmitted to the arithmetic devices A3 and B3 through the 1-system line or the 2-system line indicated by the frame transmission information F4.

  The arithmetic devices A3 and B3 that have transmitted the request frame notify the upper terminals A2 and B2 of three pieces of information as a response result of the request frame transmitted to each device. The three types of information include (1) information on the presence / absence of a response frame to which each device connected to the system 1 line or system 2 line responds, and (2) the system 1 line on which the arithmetic devices A3 and B3 received the response frame or There is information indicating the 2 system line, and (3) frame reception system information added to the response frame. The terminals A2 and B2 collate these three pieces of information with a matrix (see FIGS. 9 to 11 to be described later) for diagnosing erroneous connection of the 1-system line or the 2-system line, and the 1-system line or 2-system. Diagnose normal or incorrect connection of the line. By this diagnosis, the presence / absence of erroneous connection of the line and the location where the erroneous connection has occurred can be determined, and the connection diagnosis of the line can be made more efficient.

  Arithmetic devices A3 and B3 serving as communication masters include a memory 34 for storing transmission and reception frame information, a 1-system communication control unit 33a for performing communication control for the 1-system line, and 2-system communication for performing communication control for the 2-system line, respectively. It is comprised by the communication control part 32 which has the control part 33b inside. The transmission frame information stored in the memory 34 includes, for example, a request frame described later, and the received frame information includes, for example, a response frame described later. Further, the arithmetic devices A3 and B3 include a data control unit 31 that notifies line information to the upper terminals A2 and B2, and an optical / electrical converter 35A that converts an optical signal into an electrical signal and converts the electrical signal into an optical signal. , 35B.

  The optical repeaters A4 to D4 serving as communication slaves are a 1-system communication control unit 41A (an example of a second 1-system communication control unit) that performs communication control of a 1-system line, or 2 that performs communication control of a 2-system line. It is configured by one of the system communication control units 41B (an example of a second 2 system communication control unit). The 1-system communication control unit 41A receives a request frame from the arithmetic devices A3 and B3 through the 1-system line, and transmits a response frame to the arithmetic devices A3 and B3. The 2-system communication control unit 41B receives the request frame from the arithmetic devices A3, B3 through the 2-system line, and transmits a response frame to the arithmetic devices A3, B3. The 1-system communication control unit 41A and the 2-system communication control unit 41B can pass information (for example, a response frame) to each other via the communication path 42 (an example of a second communication path).

  The optical repeater A4 having the 1-system communication control unit 41A and the optical repeater B4 having the 2-system communication control unit 41B are in a pair relationship having the same address ("2"), and are between the optical repeaters A4 and B4. Information (for example, a response frame) can be transferred using the communication path 42. Similarly, the optical repeater D4 having the 1-system communication control unit 41A and the optical repeater C4 having the 2-system communication control unit 41B are in a pair relationship having the same address ("2"), and the optical repeaters C4 and D4 It is possible to pass information (for example, response frame) using the communication path 42 between them.

  In addition, the input / output devices A5 and B5 serving as communication slaves include optical / electrical converters 51A and 51B that convert optical signals into electrical signals or convert electrical signals into optical signals. The input / output devices A5 and B5 include a 1-system communication control unit 52A (an example of a first 1-system communication control unit) that performs communication control of a 1-system line and a 2-system communication control unit that performs communication control of a 2 system line. The communication control part 52 which has 52B (an example of a 1st 2 system communication control part) inside is provided. The 1-system communication control unit 52A receives a control command from the arithmetic devices A3 and B3 through the 1-system line, and transmits a response result to the arithmetic devices A3 and B3. The 2-system communication control unit 52B receives a control command from the arithmetic devices A3, B3 through the 2-system line, and transmits a response result to the arithmetic devices A3, B3. The 1-system communication control unit 52A and the 2-system communication control unit 52B are connected by a communication path 53 (an example of a first communication path) and can exchange information (for example, a response frame) with each other.

  The input / output device A5 includes a data control unit 54 that performs input / output to / from the control target A6, and the input / output device B5 includes a data control unit 54 that performs input / output to the control target B6. The control objects A6 and B6 are, for example, motors and various sensors arranged in the plant, and respond to the data control unit 54 with the operation results for the control commands output by the data control unit 54.

FIG. 2 is an explanatory diagram showing a configuration example of a format of a frame used for each device to communicate information.
The frame format shown in FIG. 2 includes request frames transmitted from the arithmetic devices A3 and B3, which are communication masters, to the optical repeaters A4 to D4 and input / output devices A5, B5, which are slaves, and transmitted from the slave to the master. This is common in response frames.

  The format of the frame includes a start flag F1 indicating the head of the frame, a request response F2 for distinguishing between the request frame and the response frame, and a transmission destination address F3 for storing the address of the device that is the destination of the frame. Further, it is constituted by frame transmission information F4 in which transmission system information for distinguishing whether the arithmetic devices A3 and B3 transmit a frame via the 1-system line or the 2-system line is stored. Also, it is composed of frame reception information F5 in which reception system information for distinguishing whether each device has received a frame on the 1-system line or the 2-system line, and data F6 used for data input / output. Furthermore, the frame data is constituted by a CRC (Cyclic Redundancy Check) F7 for guaranteeing the soundness of the frame data and an end flag F8 indicating the end of the frame.

  If the start flag is set in the start flag F1, each slave device that has received the frame can know that the request frame has been transmitted from any of the arithmetic devices A3 and B3. In the request response F2, “0” is set when this frame is a request frame, and “1” is set when this frame is a response frame. The destination address F3 stores the address F31 of the arithmetic device that is the master of communication and the address F32 of the optical repeater or input / output device that is the slave.

  The frame transmission information F4 is information added by any of the arithmetic devices A3 and B3 that are masters. When performing communication to the 1-system line, the 1-system information F41 of the request frame is set to “1”. In the case of performing communication to the 2-system line, the 2-system information F42 is set to “1”. The frame reception information F5 is information added by the slave optical repeater and input / output device. When the request frame is received on the 1-system line, the 1-system information F51 of the response frame is set to “1”, and when the request frame is received on the 2-system line, the 2 system information F52 is set to “1”. Is set.

  In the data F6, when this frame is a response frame, data indicating a processing result when one of the control targets A6 and B6 responds to the input / output devices A5 and B5 is set. The CRCF 7 is set with a value used for general cyclic redundancy check, and is used for each device to check whether a frame is damaged during communication. If the end flag is set in the end flag F8, each device can determine the end of the frame.

Next, with reference to FIGS. 3 to 6, a method in which an operator uses the terminal A <b> 2 to detect the presence / absence of erroneous connection of a line in the control system 1 and the erroneously connected portion will be described.
FIG. 3 is a flowchart showing an example of a procedure for diagnosing line misconnection performed by the terminals A2 and A3.
FIG. 4 is a flowchart illustrating a processing example of the arithmetic device A3.
FIG. 5 is a flowchart showing a processing example of the optical repeaters A4 and B4.
FIG. 6 is a flowchart showing a processing example of the input / output devices A5 and B5.

In the control system 1, the arithmetic unit A3 transmits the request frames whose addresses are changed in order to the optical repeaters A4 to D4 and the input / output devices A5 and B5 connected to the first system line L4 and the second system line L3. Response frames are received from the devices A4 to D4 and the input / output devices A5 and B5.
Thereafter, the request frame in which the arithmetic device B3 changes the address in order is transmitted to the optical repeaters A4 to D4 and the input / output devices A5 and B5 connected to the first line L1 and the second line L2, and the optical repeaters A4 to D4 are transmitted. The response frame is received from the input / output devices A5 and B5.

  Specifically, as shown in FIG. 3, the terminal A2 sets a line (hereinafter abbreviated as “transmission line”) through which the arithmetic device A3 transmits a request frame to the 1st system (step S1). Next, the transmission destination address F3 of the request frame is set to “2”, that is, to the optical repeaters A4 and B4 in FIG. 1 (step S2). After completing the above two settings, the terminal A2 executes a request frame transmission command to the arithmetic device A3 (step S3).

  As shown in FIG. 4, when the arithmetic unit A3 receives a request frame transmission command from the terminal A2 (step S11), the arithmetic unit A3 determines whether the transmission line designated by the terminal A2 is the first system (step S12). As a result of the determination, if the transmission line designated by the terminal A2 is system 1, the request frame is transmitted from the system 1 line L4 to each device indicated by the destination address F3 designated by the terminal A2 (step S13). If the transmission line designated by the terminal A2 is the second system, the request frame is transmitted from the second system line L3 to each device indicated by the transmission destination address F3 designated by the terminal A2 (step S14). In the following description, it is assumed that the arithmetic device A3 transmits a request frame through the 1-system line L4.

  Then, as shown in FIG. 5, when the optical repeater A4 of the 1-system line L4 receives the request frame from the arithmetic device A3 (step S21), it determines whether the system that received the request frame is the 1-system. (Step S22).

  If the system that has received the request frame is system 1, the optical repeater A4 determines whether the address of the received request frame is addressed to itself (step S23). If the address of the request frame is not addressed to the own apparatus, the optical repeater A4 transfers the request frame to the next apparatus (in this example, the input / output apparatus A5) connected by the ring method (step S28).

  On the other hand, when the address of the request frame is addressed to itself, the optical repeater A4 sets the 1-system information F51 in the frame reception information F5 of the response frame (step S24). Next, the optical repeater A4 determines whether the content of the frame transmission information F4 of the request frame transmitted from the arithmetic unit A3 is 1-system (Step S25).

In step S25, if the content of the frame transmission information F4 indicates the first system, the optical repeater A4 transmits a response frame to the arithmetic device A3 through the first system line L4 (step S27). If the content of the frame transmission information F4 indicates the second system, the optical repeater A4 notifies the frame information to be responded to the optical repeater B4 having the paired second-system communication control unit 41B (step S26). Then, the optical repeater B4 transmits a response frame toward the arithmetic unit A3 through the second system line L3 (step S33).
When the system in which the optical repeaters A4 and B4 have received the request frame is not the first system but the second system, the above-described contents of the first system and the second system are replaced (steps S21, S22, S27, S29 to S34). .

  In step S28, when the input / output device A5 receives the request frame transmitted from the system 1 as shown in the input / output device processing flow of FIG. 6 (step S41), the optical / electrical converter 51A of the input / output device A5 Convert optical signals into electrical signals. Then, the 1-system communication control section 52A in the communication control section 52 determines whether or not the system that has received the request frame converted into the electrical signal is the 1-system (step S42).

  When the system received by the 1-system communication control unit 52A is the 1-system, the 1-system communication control unit 52A determines whether the address read from the address F32 of the received request frame is addressed to its own device (step S43). . If it is not addressed to the own device, the request frame is transmitted by the 1 system to the input / output device B5 which is the next device connected by the ring method (step S47).

  On the other hand, when the address of the request frame is addressed to the own apparatus, the 1-system communication control unit 52A sets the 1-system information F51 in the frame reception information F5 of the response frame (step S44). Next, the first-system communication control unit 52A determines whether the frame transmission information of the request frame transmitted from the arithmetic device A3 is the first system (step S45).

In step S45, if the content of the frame transmission information F4 indicates system 1, the system 1 communication control unit 52A transmits a response frame to the optical repeater A4 through the system 1 line L4 (step S46). If the content of the frame transmission information F4 indicates the second system, the first system communication control unit 52A notifies the paired second system communication control unit 52B of the frame information to be responded to. Then, the 2-system communication control unit 52B transmits a response frame to the optical repeater B4 through the 2-system line L3 (step S51).
If the system in which the input / output devices A5 and B5 have received the request frame is not the first system but the second system, the above-described contents of the first system and the second system are replaced (steps S41, S42, S46, S48 to S52). .

  After the process of step S13 or S14 in FIG. 4 described above, the arithmetic unit A3 determines whether or not the response frame has been received in the first system or the second system after transmitting the request frame (step S15). When the response frame can be received by either the first system or the second system, the arithmetic unit A3 notifies the terminal A2 of the following three pieces of information (step S16). The three pieces of information include that the arithmetic device A3 has received the response frame in either the first system or the second system, the system in which the arithmetic device A3 has received the response frame, and frame reception information in the response frame.

  In step S15, if the arithmetic unit A3 determines that it has not received a response frame from either the first system or the second system due to a timeout, it notifies the terminal A2 of the following three pieces of information (step S17). In addition to the information indicating that no response frame has been received from either system 1 or system 2, the three information includes the system that received the response frame and the frame reception information in the response frame is empty data. It is included.

  Here, as shown in FIG. 3, the terminal A2 acquires three pieces of information from the arithmetic unit A3 (step S4). The three types of information include the presence / absence of reception of a response frame in either the first system or the second system, the system in which the arithmetic device A3 receives the response frame, and frame reception information in the response frame. Thereafter, the terminal A2 determines whether or not the set value of the transmission destination address F3 is “5” (step S5).

  The setting value of the destination address F3 determined in step S5 is “5” because the control system 1 assigns addresses “2” to “5” to each device. . That is, if the setting value of the transmission destination address F3 is “5”, it indicates that the transmission of the request frame has been completed to all apparatuses. If the setting value of the transmission destination address F3 is not “5”, it means that there is a device that has not diagnosed the erroneous connection and the presence / absence of the erroneous connection of the line.

  Therefore, if the setting value of the transmission destination address F3 is not “5”, the transmission destination address F3 is incremented by “1” (step S6), and a request frame transmission command is executed to the arithmetic device A3 (step S6). S3). In the process of step S6, the transmission destination address F3 is incremented, so that each device having an address after “3” can be diagnosed in order. Therefore, a request frame is transmitted from the 1-system line to all the optical repeaters A4 to D4 and the input / output devices A5 and B5 provided in the control system 1.

If the setting value of the transmission destination address F3 is “5”, it is determined whether the setting value of the transmission line is “2” (step S7).
As shown in step S1, the diagnosis of each device performed by the terminal A2 starts from the 1-system line L4. Therefore, when the setting value of the transmission line is “2”, it indicates that the transmission of the request frame has been completed for both the first system and the second system.

  If the setting value of the transmission line is not “2”, the transmission line of the request frame is set to “2” (step S8), and then the transmission destination address F3 of the request frame is set to “2” (step S2). As a result, the request frame can be transmitted from the second system line L3 to all the optical repeaters A4 to D4 and the input / output devices A5 and B5 provided in the control system 1.

  When the setting value of the transmission line is “2”, a total of six pieces of information including three from the first line and three from the second line for each transmission destination address F3 acquired in the diagnosis procedure flow of the terminal A2 shown in FIG. The erroneous connection diagnosis matrices prepared in advance for the terminal A2 are compared. This erroneous connection diagnosis matrix is shown as Tables 1 to 6 in FIGS. Then, the terminal A2 specifies the presence / absence of an erroneous connection and the location of the erroneous connection (step S9).

  Next, when the optical repeaters A4 and B4 and the input / output devices A5 and B5 receive the request frame addressed to their own devices as shown in the processing flow of the optical repeater in FIG. 5 and the input / output device process flow in FIG. An example of the operation will be described in detail with reference to a configuration diagram of each device and a schematic diagram of a frame.

  FIG. 7 is a block diagram showing an example of frame transmission / reception operations of the optical repeaters A4 and B4 when the line is normally connected and when the line is erroneously connected. FIG. 7A illustrates an example of a frame transmission / reception operation performed by the optical repeater A4 when the line is normally connected, and FIG. 7B illustrates an example of a frame transmission / reception operation performed by the optical repeater B4 when the line is erroneously connected.

  In the example of the normal connection shown in FIG. 7A, the 1-system line is connected to the optical repeater A4 from the optical / electrical converter 35A of the arithmetic unit A3. Then, the optical repeater A4 having the 1-system communication control unit 41A inside receives the request frame for the 1-system line in which “1” is set in the 1-system information F41 of the frame transmission information F4. At this time, no bit is set in the frame reception information F5 of the request frame.

The first-system communication control unit 41A of the optical repeater A4 uses the communication path 42 from the second-system communication control unit 41B when the frame reception information F5 of the request frame transmitted with the optical repeater A4 as a destination indicates a first-system line. If a response frame is received, the response frame is transmitted to the system 1 line. When the frame reception information F5 of the request frame indicates a system 2 line, a response frame is transmitted from the communication path 42 to the system 2 communication control unit 41B.
On the other hand, when the frame reception information F5 of the request frame transmitted with the optical repeater A4 as the destination indicates a system 2 line, or the system 2 communication control unit 41B responds via the communication path 42 from the system 1 communication control unit 41A. Is received, a response frame is transmitted to the second system line. When the frame reception information F5 of the request frame indicates a system 1 line, a response frame is transmitted from the communication path 42 to the system 1 communication control unit 41A.
In this way, the optical repeater A4 transmits a response frame in a system that matches the frame transmission information F4 if the frame transmission information F4 is different from the system that received the request frame addressed to itself, and therefore the arithmetic device A3 A response frame can be reliably received.

  Specifically, when receiving the request frame addressed to the own apparatus, the 1-system communication control unit 41A of the optical repeater A4 rewrites the request response F2 of the received request frame to “response”, and the 1-system of the frame reception information F5 “1” is set in the information F51 (indicated as “1 system” in the figure). As a result, the system in which the first-system communication control unit 41A receives the request frame and the frame transmission information F4 stored in the request frame both match in the first system. For this reason, a response frame is transmitted from the 1-system communication control unit 41A to the arithmetic unit A3 through the 1-system line L4. This response frame follows the 1-system line L4 in the order of the input / output devices A5 and B5 and the optical repeater D4 and reaches the arithmetic unit A3.

  In the example when the line is erroneously connected as shown in FIG. 7B, the line that should be connected from the optical / electrical converter 35A of the arithmetic unit A3 to the optical repeater A4 is erroneously connected to the optical repeater B4. Then, the optical repeater B4 having the 2-system communication control unit 41B inside receives the request frame for the 1-system line in which “1” is set in the 1-system information F41 of the frame transmission information F4. Then, the 2-system communication control unit 41B of the optical repeater B4 sets the 2-system information F52 in the frame reception information F5 of the received request frame.

  At this time, because the line is erroneously connected, the system that receives the request frame and the system information added to the frame transmission information F4 stored in the request frame do not match. For this reason, the second-system communication control unit 41B of the optical repeater B4 notifies frame information to be responded to a system different from the system that received the request frame, that is, the first-system communication control unit 41A of the optical repeater A4. At the time of this notification, the 2-system communication control unit 41B rewrites the frame request response F2 to “response” and sets “2” in the 2-system information F52 of the frame reception information F5 (denoted as “system 2” in the figure). The response frame is transmitted to the first-system communication control unit 41A through the communication path 42. Then, the 1-system communication control unit 41A of the optical repeater A4 transmits the response frame received from the optical repeater B4 to the arithmetic unit A3. This response frame follows the 1-system line L4 in the order of the input / output devices A5 and B5 and the optical repeater D4 and reaches the arithmetic unit A3.

  FIG. 8 is a block diagram showing an example of frame transmission / reception operations of the input / output devices A5 and B5 when the line is normally connected and when the line is erroneously connected. FIG. 8A shows an example of a frame transmission / reception operation performed by the input / output device A5 when the line is normally connected, and FIG. 8B shows an example of a frame transmission / reception operation performed by the input / output device B5 when the line is erroneously connected.

  In the example when the line is normally connected shown in FIG. 8A, the input / output device A5 is a 1-system communication control unit 52A in the communication control unit 52, and 1 is set in the 1-system information F41 of the frame transmission information F4. A request frame for the system line is received. At this time, no bit is set in the frame reception information F5 of the request frame.

  The first-system communication control unit 52A of the input / output device A5 uses the communication path 53 from the second-system communication control unit 52B when the frame transmission information F4 of the request frame transmitted with the input-output device A5 as the destination indicates a first-system line. If a response frame is received, the response frame is transmitted to the system 1 line. When the frame transmission information F4 of the request frame indicates a system 2 line, the system 1 communication control unit 52A transmits a response frame from the communication path 53 to the system 2 communication control unit 52B.

Similarly, the 2-system communication control unit 52B responds via the communication path 53 from the 1-system communication control unit 52A when the frame transmission information F4 of the request frame transmitted to the input / output device A5 indicates the 2-system line. When a frame is received, a response frame is transmitted to the system 2 line. Then, when the frame transmission information F4 of the request frame indicates a system 1 line, the system 2 communication control unit 52B transmits a response frame from the communication path 53 to the system 1 communication control unit 52A.
Thus, since the input / output device A5 transmits a response frame in a system that matches the frame transmission information F4 if the frame transmission information F4 is different from the system that received the request frame addressed to itself, the arithmetic device A3 A response frame can be reliably received.

  Specifically, upon receiving a request frame addressed to itself, the 1-system communication control unit 52A rewrites the request response F2 of the received request frame to “response”, and sets “1” in the 1-system information F51 of the frame reception information F5. "Is set (indicated as" 1 system "in the figure). As a result, the system in which the first-system communication control unit 52A receives the request frame and the frame transmission information F4 stored in the request frame both match in the first system. Therefore, a response frame is transmitted from the 1-system communication control unit 52A of the input / output device A5 to the arithmetic device A3 through the 1-system line L4. The response frame reaches the arithmetic unit A3 by following the system 1 line L4 in the order of the input / output device B5 and the optical repeater D4.

  In the example when the line is erroneously connected shown in FIG. 8B, the line that should be connected from the 1-system communication control unit 52A of the input / output device A5 to the 1-system communication control unit 52A of the input / output device B5 is mistakenly input / output device B5. Are connected to the 2-system communication control unit 52B. For this reason, the input / output device B5 having the 2-system communication control unit 52B inside receives the request frame for the 1-system line in which “1” is set in the 1-system information F41 of the frame transmission information F4. Then, the second-system communication control unit 52B of the input / output device B5 sets “1” to the second-system information F52 of the frame reception information F5 of the received request frame (described as “second-system” in the drawing).

  At this time, because the line is erroneously connected, the system that receives the request frame and the system information added to the frame transmission information F4 stored in the request frame do not match. For this reason, a response frame is transmitted from the 2-system communication control unit 52B to the 1-system communication control unit 52A. At this time, the 2-system communication control unit 52B rewrites the request response F2 of the frame to “response”, and sends a response frame in which “1” is set to the 2-system information F52 of the frame reception information F5 via the communication path 53. It transmits to the system communication control part 52A. Then, the 1-system communication control unit 52A of the input / output device B5 transmits the response frame received from the optical repeater B4 to the arithmetic device A3. This response frame follows the 1-system line L4 via the optical repeater D4 and reaches the arithmetic unit A3.

Next, an erroneous connection diagnosis matrix to be referred to in the line diagnosis performed by the terminal A2 in step S9 in FIG. 3 will be described with reference to FIGS.
The terminal A2 compares the three pieces of information acquired from the arithmetic unit A3 with the erroneous connection diagnosis matrix, and specifies the presence / absence of the erroneous connection of the line and the erroneous connection location.

The following are examples of line misconnection forms.
For example, electrical cable misconnection between input / output devices, optical cable misconnection from the optical repeater to the input / output device, optical cable misconnection from the input / output device to the optical repeater, and optical cable from the computing device to the optical repeater There are misconnections and misconnections from the optical repeater to the arithmetic unit.

  Therefore, an example of the erroneous connection diagnosis matrix possessed by the terminal A2 will be described with reference to FIGS.

FIG. 9 to FIG. 11 are explanatory diagrams showing configuration examples of tables respectively corresponding to the above-described line misconnection forms.
FIG. 9A shows Table 1 of the result of normal connection, and FIG. 9B shows Table 2 of the result of erroneous connection of the electric cable between the input / output devices A5 and B5.
FIG. 10A shows Table 3 of the optical cable misconnection results from the optical repeaters A4 and B4 in the direction of the input / output device A5. FIG. 10B shows the optical cable error in the direction of the optical repeaters A4 and B4 from the input / output device A5. Table 4 shows the connection results.
Further, FIG. 11A shows a table 5 of optical cable misconnection results from the arithmetic device A3 in the direction of the optical repeaters A4 and C4, and FIG. 11B shows an optical cable misconnection result from the optical repeaters B4 and D4 in the direction of the arithmetic device A3. Table 6 is shown.

Each table shown in FIG. 9 to FIG. 11 shows an expected value assumed when the 1-system diagnosis and the 2-system diagnosis are performed on the devices assigned the addresses “2” to “5”. .
The 1-system diagnosis column shows three pieces of information acquired from the arithmetic unit A3 when the terminal A2 sets the transmission line to the 1-system. Based on this information, whether the arithmetic device A3 has received the response frame in the first system or the second system or not, whether or not a response frame has been received, the system in which the arithmetic device A3 received the response frame, the response frame This indicates whether the frame reception information F5 of the first system or the second system. For these three pieces of information, each table is expressed in a correct / incorrect format based on a state in which the lines in the control system 1 are normally connected.
The same information as the 1-system diagnosis column is stored in the 2-system diagnosis column.

  Each table shown in FIGS. 9 to 11 also corresponds to three pieces of information acquired from the arithmetic unit B3 when the terminal B2 sets the transmission line to the 1st system or the 2nd system. In the following, an operation example when the arithmetic device A3 performs line misconnection diagnosis according to an instruction from the terminal A2 will be described, and an operation example when the arithmetic device A3 performs line misconnection diagnosis will be omitted.

  As shown in FIG. 1, when the terminal A2 starts diagnosis in a state in which the line in the control system 1 is normally connected, the arithmetic unit A3 uses each device as the destination from the 1-system line L4, The request frame is transmitted to the 1-system communication control unit. As a result, the request frames transmitted to the destination optical repeater A4, input / output devices A5 and B5, and optical repeater D4 reach the respective 1-system communication control units.

  Then, a response frame is transmitted from the 1-system communication control unit of each device toward the 1-system communication control unit 33a of the arithmetic device A3. Therefore, the three pieces of information that the terminal A2 obtains from the arithmetic unit A3 is that there is a response frame received in either the first system or the second system, the first system that received the response frame is the first system, and the frame reception information in the response frame is It becomes 1 system, and it agrees with the result of 1 system diagnosis shown in Table 1 of FIG. 9A.

  Next, the arithmetic unit A3 transmits a request frame to the second-system communication control unit in each device with each device as the destination from the second-system line L3. As a result, the request frame transmitted toward the optical repeater C4, the input / output devices B5 and A5, and the optical repeater B4 reaches the respective 2-system communication control units.

  Then, a response frame is transmitted from the 2-system communication control unit of each device to the 2-system communication control unit 33b of the arithmetic device A3. For this reason, the three pieces of information acquired by the terminal A2 from the arithmetic unit A3 are the reception of response frames in either the first system or the second system, the second system receiving the response frame is the second system, and the frame reception information in the response frame is It becomes 2 systems, and corresponds with the result of 2 system diagnosis shown in Table 1 of Drawing 9A.

  In the control system 1 configured as shown in FIG. 1 based on the above results, when the terminals A2 and B2 perform line misconnection diagnosis, the result is the same as the result shown in Table 1 of FIG. I understand that.

  FIG. 12 is a block diagram illustrating a configuration example in which an erroneous connection has occurred in the electric cable between the input / output device A5 and the input / output device B5 of the control system 1. In this configuration, the 1-system communication control unit 52A of the input / output device A5 is erroneously connected to the 2-system communication control unit 52B of the input / output device B5, and the 2-system communication control unit 52B of the input / output device A5 is 1 of the input / output device B5. Misconnected to the system communication control unit 52A.

  In this configuration, when the arithmetic device A3 transmits a request frame from the 1-system line L4 to the 1-system communication control unit of each device, the optical repeaters A4 and B4 with the address “2” and the input / output device A5 with the address “3”. The request frame transmitted toward the network normally reaches each 1-system communication control unit. However, the response frames transmitted by the optical repeaters A4 and B4 and the input / output device A5 are sent to the second communication control unit 33b of the arithmetic device B3 via the second communication control unit 52B of the input / output device B5 and the optical repeater C4. And does not return to the arithmetic unit A3. For this reason, the three pieces of information that the terminal A2 acquires from the arithmetic unit A3 are no response frame reception, empty data, and empty data in either the first system or the second system.

  Further, the request frame transmitted from the arithmetic unit A3 to the input / output device B5 having the address “4” and the optical repeaters C4 and D4 having the address “5” arrives at the respective 2-system communication control units, and the 1-system communication. Passed to the control unit. Thereafter, a response frame is transmitted from the 1-system communication control unit to the 1-system communication control unit 33a of the arithmetic device A3. Therefore, the three pieces of information that the terminal A2 obtains from the arithmetic unit A3 is that there is a response frame received in either the first system or the second system, the first system that received the response frame is the first system, and the frame reception information in the response frame is It becomes 2 systems, and corresponds with the result of 1 system diagnosis shown in Table 2 of Drawing 9B.

  Next, when the arithmetic device A3 transmits a request frame to the second system communication control unit of each device from the second system line L3, the request frames transmitted to the optical repeaters C4 and D4 and the input / output device B5 are normally transmitted. To the second system communication control unit. However, response frames from the optical repeaters C4 and D4 and the input / output device B5 are sent to the 1-system communication control unit 33a of the arithmetic unit B3 via the 1-system communication control unit 52A of the input / output device A5 and the optical repeater A4. Arrives and does not return to the arithmetic unit A3. For this reason, the three pieces of information that the terminal A2 acquires from the arithmetic unit A3 are no response frame reception, empty data, and empty data in either the first system or the second system.

  Further, the request frame transmitted from the arithmetic unit A3 to the input / output unit A5 and the optical repeaters A4 and B4 reaches the respective 1-system communication control units and is passed to the 2-system communication control unit. Thereafter, a response frame is transmitted from the 2-system communication control unit to the 2-system communication control unit 33b of the arithmetic device A3. For this reason, the three pieces of information acquired by the terminal A2 from the arithmetic unit A3 are the reception of response frames in either the first system or the second system, the second system receiving the response frame is the second system, and the frame reception information in the response frame is It becomes 1 system, and it agrees with the result of 2 system diagnosis shown in Table 2 of FIG. 9B.

  From the diagnosis result, in the control system 1 configured as shown in FIG. 12, when the line misconnection diagnosis is performed, the result matches the result shown in Table 2 of FIG. 9B, and therefore, between the input / output device A5 and the input / output device B5. It can be seen that a misconnection has occurred in the electric cable.

  FIG. 13 is a block diagram illustrating a configuration example in which an erroneous connection has occurred in the optical cable from the optical repeaters A4 and B4 in the control system 1 toward the input / output device A5.

  In this configuration, when the arithmetic device A3 transmits a request frame from the 1-system line L4 to the 1-system communication control unit of each device, the request frame transmitted toward the optical repeaters A4 and B4 normally arrives. However, the response frames from the optical repeaters A4 and B4 are sent from the arithmetic unit B3 via the 2-system communication control unit 52B of the input / output device A5, the 2-system communication control unit 52B of the input / output device B5, and the optical repeater C4. It reaches the second system communication control unit 33b and does not return to the arithmetic unit A3. For this reason, the three pieces of information that the terminal A2 acquires from the arithmetic unit A3 are no response frame reception, empty data, and empty data in either the first system or the second system.

  Further, the request frame transmitted from the arithmetic unit A3 to the input / output devices A5 and B5 and the optical repeaters C4 and D4 reaches the respective 2-system communication control units and is passed to the 1-system communication control unit. Thereafter, a response frame is transmitted from the 1-system communication control unit to the 1-system communication control unit 33a of the arithmetic device A3. Therefore, the three pieces of information that the terminal A2 obtains from the arithmetic unit A3 is that there is a response frame received in either the first system or the second system, the first system that received the response frame is the first system, and the frame reception information in the response frame is This corresponds to the result of 1-system diagnosis shown in Table 3 of FIG. 10A.

  Next, when the arithmetic unit A3 transmits a request frame to the second system communication control unit of each device from the second system line L3, the arithmetic device A3 is directed to the optical repeaters C4 and D4, the input / output devices B5 and A5, and the optical repeaters A4 and B4. The request frame transmitted in this manner normally arrives at each 2-system communication control unit. The response frames from the optical repeaters C4 and D4, the input / output devices B5 and A5, and the optical repeaters A4 and B4 are all normally returned to the 2-system communication control unit 33b of the arithmetic unit A3. For this reason, the three pieces of information acquired by the terminal A2 from the arithmetic unit A3 are the reception of response frames in either the first system or the second system, the second system receiving the response frame is the second system, and the frame reception information in the response frame is This corresponds to the result of the two-system diagnosis shown in Table 3 of FIG. 10A.

  From the diagnosis result, in the control system 1 configured as shown in FIG. 13, when a line misconnection diagnosis is performed, the result matches the result shown in Table 3 of FIG. 10A, so that the direction from the optical repeaters A4 and B4 to the input / output device A5 It can be seen that an erroneous connection has occurred in the optical cable to the cable.

  FIG. 14 is a block diagram illustrating a configuration example in which an erroneous connection has occurred in the optical cable from the input / output device A5 of the control system 1 to the optical repeaters A4 and B4.

  In this configuration, when the arithmetic device A3 transmits a request frame from the 1-system line L4 to the 1-system communication control unit of each device, it is directed to the optical repeaters A4 and B4, the input / output devices A5 and B5, and the optical repeaters C4 and D4. The request frame transmitted in this manner normally reaches each 1-system communication control unit. The response frames from the optical repeaters A4 and B4, the input / output devices A5 and B5, and the optical repeaters C4 and D4 are all normally returned to the 1-system communication control unit 33a of the arithmetic unit A3. Therefore, the three pieces of information that the terminal A2 obtains from the arithmetic unit A3 is that there is a response frame received in either the first system or the second system, the first system that received the response frame is the first system, and the frame reception information in the response frame is It becomes 1 system, and corresponds with the result of 1 system diagnosis shown in Table 4 of Drawing 10B.

  Next, when the arithmetic device A3 transmits the request frame to the second system communication control unit of each device from the second system line L3, the request frame transmitted to the optical repeaters C4 and D4 and the input / output devices B5 and A5 is normal. To the respective 2-system communication control units. However, response frames from the optical repeaters C4 and D4 and the input / output devices B5 and A5 reach the 1-system communication control unit 33a of the arithmetic device B3 via the optical repeater A4 and do not return to the arithmetic device A3. For this reason, the three pieces of information that the terminal A2 acquires from the arithmetic unit A3 are no response frame reception, empty data, and empty data in either the first system or the second system.

  Further, the request frame transmitted from the arithmetic unit A3 to the optical repeaters A4 and B4 reaches the 1-system communication control unit 41A of the optical repeater A4 and is passed to the 2-system communication control unit 41B. Thereafter, a response frame is transmitted from the optical repeater B4 to the second-system communication control unit 33b of the arithmetic unit A3. For this reason, the three pieces of information acquired by the terminal A2 from the arithmetic unit A3 are the reception of response frames in either the first system or the second system, the second system receiving the response frame is the second system, and the frame reception information in the response frame is It becomes 1 system and agrees with the result of 2 system diagnosis shown in Table 4 of FIG. 10B.

  In the control system 1 configured as shown in FIG. 14 based on the diagnosis result, when the line misconnection diagnosis is performed, the result matches the result shown in Table 4 in FIG. 10B, and therefore the direction from the input / output device A5 to the optical repeaters A4 and B4. It can be seen that an erroneous connection has occurred in the optical cable to the cable.

  FIG. 15 is a block diagram illustrating a configuration example in which an erroneous connection occurs in the optical cable from the arithmetic device A3 of the control system 1 to the optical repeaters A4 and C4.

  In this configuration, when the arithmetic device A3 transmits a request frame from the 1-system line L4 to the 1-system communication control unit of each device, it is directed to the optical repeaters A4 and B4, the input / output devices A5 and B5, and the optical repeaters C4 and D4. The request frame transmitted in this way reaches the respective two-system communication control units. For this reason, the 2 system communication control unit of each device passes the response frame to the 1 system communication control unit, and then the response frame is transmitted from the 1 system communication control unit to the 1 system communication control unit 33a of the arithmetic device A3. Therefore, the three pieces of information that the terminal A2 obtains from the arithmetic unit A3 is that there is a response frame received in either the first system or the second system, the first system that received the response frame is the first system, and the frame reception information in the response frame is This corresponds to the result of the 1-system diagnosis shown in Table 5 of FIG. 11A.

  Next, when the arithmetic unit A3 transmits a request frame to the second system communication control unit of each device from the second system line L3, the arithmetic device A3 is directed to the optical repeaters C4 and D4, the input / output devices B5 and A5, and the optical repeaters A4 and B4. The request frames transmitted in this way reach the 1-system communication control unit. For this reason, the 1-system communication control unit of each device passes the response frame to the 2-system communication control unit, and then the response frame is transmitted from the 2-system communication control unit to the 2-system communication control unit 33b of the arithmetic device A3. For this reason, the three pieces of information acquired by the terminal A2 from the arithmetic unit A3 are the reception of response frames in either the first system or the second system, the second system receiving the response frame is the second system, and the frame reception information in the response frame is It becomes 1 system, and agrees with the result of 2 system diagnosis shown in Table 5 of FIG. 11A.

  In the control system 1 having the configuration shown in FIG. 15 based on the diagnosis result, when the line misconnection diagnosis is performed, the result matches the result shown in Table 5 in FIG. 11A, so that the arithmetic unit A3 moves to the optical repeaters A4 and C4. It can be seen that a line misconnection has occurred in the optical cable.

  FIG. 16 is a block diagram illustrating a configuration example in which an erroneous connection has occurred in the optical cable from the optical repeaters B4 and D4 of the control system 1 toward the arithmetic unit A3.

  In this configuration, when the arithmetic device A3 transmits a request frame from the 1-system line L4 to the 1-system communication control unit of each device, it is directed to the optical repeaters A4 and B4, the input / output devices A5 and B5, and the optical repeaters C4 and D4. The request frames transmitted in this way reach the 1-system communication control unit. Then, a frame is transmitted from the 1-system communication control unit to the arithmetic device A3.

  However, the arithmetic unit A3 receives the response frame at the second system communication control unit 33b. For this reason, the three pieces of information acquired by the terminal A2 from the arithmetic unit A3 are the reception of response frames in either the first system or the second system, the second system receiving the response frame is the second system, and the frame reception information in the response frame is 1 system, which matches the results of the 1 system diagnosis shown in Table 6 of FIG. 11B.

  Next, when the arithmetic unit A3 transmits a request frame to the second system communication control unit of each device from the second system line L3, the arithmetic device A3 is directed to the optical repeaters C4 and D4, the input / output devices B5 and A5, and the optical repeaters A4 and B4. The request frames transmitted in this manner reach the second system communication control unit. Then, the frame is transmitted from the 2-system communication control unit to the arithmetic unit A3.

  However, the arithmetic unit A3 receives the response frame at the 1-system communication control unit 33a. Therefore, the three pieces of information that the terminal A2 obtains from the arithmetic unit A3 is that there is a response frame received in either the first system or the second system, the first system that received the response frame is the first system, and the frame reception information in the response frame is This corresponds to the result of the second system diagnosis shown in Table 6 of FIG. 11B.

  In the control system 1 having the configuration shown in FIG. 16 based on the diagnosis result, when the line misconnection diagnosis is performed, the result shown in Table 6 in FIG. 11B matches the result shown in Table 6 from the optical repeaters B4 and D4 toward the arithmetic unit A3. It can be seen that a line misconnection has occurred in the optical cable.

  In the control system 1 according to the embodiment described above, the redundant arithmetic devices A3 and B3 are connected to the optical repeaters A4 to D4 and the input / output devices A5 and B5 that are connected in a double ring. The terminal A2 and B2 are notified of the response result for the transmitted request frame. Then, the terminals A2 and B2 can identify the presence / absence of the erroneous connection and the location of the erroneous connection by comparing the response result to the request frame received from the arithmetic devices A3 and B3 with the erroneous connection diagnosis matrix. Since the response result to this request frame includes information indicating that no response frame has been received from either the system 1 line or the system 2 line, the connection diagnosis of the line taking into account the loss of the response frame is performed. It becomes possible.

  In addition, if the contents of the frame transmission information F4 added to the request frame addressed to the own device due to incorrect connection of the line and the system of the line that actually received the request frame are different, each device Frame reception information F5 is added. Then, a response frame is transmitted in a system that matches the content of the frame transmission information F4. For this reason, the arithmetic devices A3 and B3 can easily grasp the line on which the erroneous connection has occurred based on the content of the received response frame.

  In addition, after the arithmetic device A3 performs connection diagnosis of each device in the order of the first system line and the second system line, the arithmetic device B3 performs connection diagnosis of each device in the order of the first system line and the second system line. For this reason, since the connection diagnosis between all the apparatuses with which the control system 1 is provided is automated, work efficiency can be greatly improved compared with the case where the worker has confirmed visually. As a result, it is possible to easily identify the presence / absence of an erroneous connection of the line and its location, and to prevent malfunction and malfunction of the control system 1 due to oversight of the erroneous connection location.

  Further, the tables shown in FIGS. 9 to 11 are displayed by the terminals A2 and B2 on a monitor or the like (not shown), thereby helping the worker to grasp the erroneous connection of the line. However, immediately after performing either the 1-system diagnosis or the 2-system diagnosis, the tables shown in FIGS. 9 to 11 may be used so that it is possible to quickly grasp the location where the erroneous connection of the line has occurred. .

  The location of each duplicated device is managed by the same address, and it is possible to specify the destination simply by changing the address, so even if the number of devices increases, connection diagnosis of all lines is easy. Easy to perform.

  The series of processes in the above-described embodiment can be executed by hardware, but can also be executed by software. When a series of processing is executed by software, it can be executed by a computer in which a program constituting the software is incorporated in dedicated hardware or a computer in which programs for executing various functions are installed. . For example, a program constituting desired software may be installed and executed on a general-purpose personal computer or the like.

  Examples of the recording medium for supplying the program code to the system or apparatus include a flexible disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, magnetic tape, nonvolatile memory card, ROM, etc. Is used. It is also possible to provide software program codes via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  Further, the functions of the above-described embodiment are realized by executing the program code read by the computer. In addition, an OS or the like running on the computer performs part or all of the actual processing based on the instruction of the program code. The case where the function of the above-described embodiment is realized by the processing is also included.

Further, the present invention is not limited to the above-described embodiments, and various other application examples and modifications can be taken without departing from the gist of the present invention described in the claims.
For example, the above-described exemplary embodiments are detailed and specific descriptions of the configuration of the apparatus and the system in order to easily understand the present disclosure, and are not necessarily limited to those having all the configurations described. . Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Moreover, it is also possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
In addition, the control lines and information lines are those that are considered necessary for the explanation, and not all the control lines and information lines on the product are necessarily shown. Actually, it may be considered that almost all the components are connected to each other.

  DESCRIPTION OF SYMBOLS 1 ... Control system, 2 ... Terminal A, B, 3 ... Arithmetic apparatus A, B, 4 ... Optical repeater A-D, 5 ... Input-output device A, B, 6 ... Control object A, B

Claims (9)

A redundant computing device that is ring-connected by the duplexed system 1 and system 2 lines and that outputs a control command to a control target instructed by a host terminal;
Each of the first system line and the second system line is ring-connected, outputs the control command received from the arithmetic device to the control target, and transmits a response result received from the control target to the arithmetic device. An input / output device;
The input / output device is
A first 1-system communication control unit that receives the control command from the computing device via the 1-system line and transmits the response result to the computing device;
A first 2 connected to the first 1-system communication control unit by a first communication path, receives the control command from the arithmetic device via the second system line, and transmits the response result to the arithmetic device. System communication control unit,
The arithmetic device transmits a request frame to which first system information for identifying the first system line or the second system line is added, with the input / output device as a destination,
The first 1-system communication control unit of the input / output device, when the first system information of the request frame transmitted from the arithmetic device with the input / output device as a destination indicates the 1-system line; or When a response frame to the request frame is received from the first second-line communication control unit via the first communication path, the first-line line or the second-line line that has received the request frame is identified. The response frame to which the second system information is added is transmitted to the arithmetic unit via the first system line indicated by the first system information, and the first system information of the request frame is the 2 When indicating a system line, the response frame is transmitted from the first communication path to the first 2 system communication control unit,
The first second-system communication control unit of the input / output device, when the first-system information of the request frame transmitted from the arithmetic device with the input / output device as a destination indicates the second-system line; or When the response frame is received from the first first-system communication control unit via the first communication path, the response frame to which the second system information is added is indicated by the first system information. When the first system information of the request frame indicates the first system line, the response frame is transmitted from the first communication path to the first system. To the 1-system communication controller of
The terminal diagnoses normal connection or erroneous connection of the system 1 line or system 2 line based on a response result to the request frame received from the arithmetic device. The terminal receives, as a response result to the request frame, information on the presence / absence of the response frame responded by the input / output device connected to the system 1 or system 2 line, and the arithmetic unit receives the response frame. After receiving the information indicating the first system line or the second system line and the second system information added to the response frame, an erroneous connection of the first system line or the second system line is diagnosed. The control system according to claim 1, wherein a normal connection or an erroneous connection of the first-system line or the second-system line is diagnosed by checking with a table for checking. Among the duplicated input / output devices, the first 1-system communication control unit provided in one of the input / output devices and the first 1-system communication control unit provided in the other input / output device are first. The first two-system communication control unit provided in the other input / output device and the first two-system communication control unit provided in one of the input / output devices are connected by an electrical cable or a first optical cable. The control system according to claim 2 , wherein the control system is connected by a second electric cable or a second optical cable. Further, when the arithmetic device and the input / output device are connected by an optical cable, the arithmetic system and the input / output device are ring-connected by the system 1 line and the system 2 line, and are arranged between the arithmetic device and the input / output device, It has a duplexed optical repeater that relays optical signals,
When the optical repeater receives the request frame to which the first system information added with the optical repeater as a destination is received by the arithmetic unit using either the first line or the second line, the second system information added to the request frame, according to claim 3 for transmitting a response frame to said request frame with one system line or the 2 system line indicated by the first system information toward the arithmetic unit The described control system. The terminal, as a response result to the request frame, the presence / absence of the response frame responded by the optical repeater connected to the system 1 line or the system 2 line, and the arithmetic unit receiving the response frame 1 After obtaining information indicating the system line or the second system line and the second system information added to the response frame, the information is collated with a table for diagnosing erroneous connection of the first system line or the second system line. The control system according to claim 4 , wherein normal connection or erroneous connection of the first system line or the second system line is diagnosed. The optical repeater is
A second system 1 communication control unit that receives the request frame from the computing device via the system 1 line and transmits the response frame to the computing device;
A second 2 connected to the second 1-system communication control unit by a second communication path, receiving the request frame from the computing device via the 2-system line, and transmitting the response frame to the computing device. System communication control unit,
The second system 1 communication control unit is configured when the second system information of the request frame transmitted with the optical repeater as a destination indicates the system 1 line, or the second system 2 communication control unit When the response frame is received via the second communication path, the response frame is transmitted to the system 1 line, and the second system information of the request frame indicates the system 2 line. Transmits the response frame from the second communication path to the second 2-system communication control unit,
The second 2-system communication control unit is configured when the second system information of the request frame transmitted with the optical repeater as a destination indicates the 2-system line, or the second 1-system communication control unit When the response frame is received via the second communication path, the response frame is transmitted to the second system line, and the second system information of the request frame indicates the first system line. The control system according to claim 5 , wherein the response frame is transmitted from the second communication path to the second system 1 communication control unit. The destination added to the request frame includes different position information allocated to the duplicated arithmetic device, the optical repeater, and the input / output device,
One of the arithmetic devices transmits the request frame in which the position information is changed in order to the optical repeater and the input / output device connected to the first-line and second-line, and the optical repeater and the input After receiving the response frame from the output device,
The other arithmetic device transmits the request frame in which the position information is changed in order to the optical repeater and the input / output device connected to the first and second system lines, and The control system according to claim 6, wherein the response frame is received from an output device. A redundant computing device that is ring-connected by the duplexed system 1 and system 2 lines and that outputs a control command to a control target instructed by a host terminal;
Each of the first system line and the second system line is ring-connected, outputs the control command received from the arithmetic device to the control target, and transmits a response result received from the control target to the arithmetic device. An input / output device ;
The input / output device is
A first 1-system communication control unit that receives the control command from the computing device via the 1-system line and transmits the response result to the computing device;
A first 2 connected to the first 1-system communication control unit by a first communication path, receives the control command from the arithmetic device via the second system line, and transmits the response result to the arithmetic device. A line connection diagnosis method performed in a control system comprising a system communication control unit ,
The arithmetic device transmits a request frame to which first system information for identifying the first system line or the second system line is added with the input / output device as a destination;
The first 1-system communication control unit of the input / output device, when the first system information of the request frame transmitted from the arithmetic device with the input / output device as a destination indicates the 1-system line; or When a response frame to the request frame is received from the first second-line communication control unit via the first communication path, the first-line line or the second-line line that has received the request frame is identified. The response frame to which the second system information is added is transmitted to the arithmetic unit via the first system line indicated by the first system information, and the first system information of the request frame is the 2 When indicating a system line, the step of transmitting the response frame from the first communication path to the first 2 system communication control unit ;
The first second-system communication control unit of the input / output device, when the first-system information of the request frame transmitted from the arithmetic device with the input / output device as a destination indicates the second-system line; or When the response frame is received from the first first-system communication control unit via the first communication path, the response frame to which the second system information is added is indicated by the first system information. When the first system information of the request frame indicates the first system line, the response frame is transmitted from the first communication path to the first system. Transmitting to the 1-system communication control unit of
The terminal includes a step of diagnosing normal connection or erroneous connection of the system 1 line or system 2 line based on a response result to the request frame received from the arithmetic device. A redundant computing device that is ring-connected by the duplexed system 1 and system 2 lines and that outputs a control command to a control target instructed by a host terminal;
Each of the first system line and the second system line is ring-connected, outputs the control command received from the arithmetic device to the control target, and transmits a response result received from the control target to the arithmetic device. An input / output device ;
The input / output device is
A first 1-system communication control unit that receives the control command from the computing device via the 1-system line and transmits the response result to the computing device;
A first 2 connected to the first 1-system communication control unit by a first communication path, receives the control command from the arithmetic device via the second system line, and transmits the response result to the arithmetic device. A program to be executed by a computer in a control system comprising a system communication control unit ,
The arithmetic device transmits a request frame to which the first system information for identifying the first system line or the second system line is added, with the input / output device as a destination,
The first 1-system communication control unit of the input / output device, when the first system information of the request frame transmitted from the arithmetic device with the input / output device as a destination indicates the 1-system line; or When a response frame to the request frame is received from the first second-line communication control unit via the first communication path, the first-line line or the second-line line that has received the request frame is identified. The response frame to which the second system information is added is transmitted to the arithmetic unit via the first system line indicated by the first system information, and the first system information of the request frame is the 2 When indicating a system line, a procedure for transmitting the response frame from the first communication path to the first 2 system communication control unit ;
The first second-system communication control unit of the input / output device, when the first-system information of the request frame transmitted from the arithmetic device with the input / output device as a destination indicates the second-system line; or When the response frame is received from the first first-system communication control unit via the first communication path, the response frame to which the second system information is added is indicated by the first system information. When the first system information of the request frame indicates the first system line, the response frame is transmitted from the first communication path to the first system. The procedure to transmit to the 1 system communication control unit of
A program for causing a computer to execute a procedure for diagnosing normal connection or erroneous connection of the first system line or second system line based on a response result to the request frame received from the arithmetic device.

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