JP2000347706A - Plant controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant controller capable of reducing costs by reducing the number of waiting side CPUs and also operating and monitoring the plant even during a periodic inspection period of the plant controller including a process input-output device. SOLUTION: Distributions B1 to BN respectively having a CPU 1 connected to a network 14 through a master card 13 are connected through the network 14 to process input-output devices 11 which are connected to a plant to be controlled and constructed so as to input and output process information, perform arithmetic processing on the process information, also when abnormality takes place in the distribution B1, the abnormality is transmitted to the distribution B2 through a signal line 15 transmitting abnormal information by connecting the distributions, and the distribution B2 performs the processing of the distribution B1 as well as its own processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant control apparatus for sharing a plant input / output device among a plurality of arithmetic and control units (hereinafter referred to as "distribution") for controlling a controlled plant.

[0002]

2. Description of the Related Art FIG. 10 shows, for example, Japanese Patent Publication No. 5-86582.
FIG. 1 is a configuration diagram of a conventional duplex controller disclosed in Japanese Patent Application Publication No. H10-115,004. In the figure, 1A and 1B are central processing units (C
PU), 2A and 2B are memories, 3A and 3B are transmission I /
F, 4A and 4B are transmission controllers, 5A and 5B are system buses, and each CPU, memory and transmission controller are connected. 6A and 6B are diagnostic circuits, 7A and 7B
Is a process input / output device interface, 8A and 8B are switching circuits, 9 is a switching logic bus, and a diagnostic circuit 6A,
6B is connected. Reference numeral 10 denotes a process input / output device bus to which the process input / output device interfaces 7A and 7B are connected. Reference numeral 11 denotes a process input / output device. 1
Reference numeral 2 denotes a data way connected to the transmission I / Fs 3A and 3B. A and B are controllers, each of which is 1A
-8A, 1B-8B.

Next, the operation will be described. Two CPUs 1A and 1B sharing the process input / output device 11 are connected by a process input / output device bus 10. Two CPUs 1A,
1B is based on the contents of the respective memories 2A and 2B,
Perform control calculation. Of the two CPUs, the control CPU 1A having the control right takes in process data from the process input / output device 11 at predetermined control cycles, performs control arithmetic processing, and inputs the process data from the process input / output device 11. Standby CPU without control of process data
1B at each control cycle. Each time the standby CPU 1B receives the process data from the control CPU 1A, it performs a control operation for one control cycle based on the received data.
If an abnormality occurs in the control side CPU 1A, the diagnostic circuit 6
A detects an abnormality, outputs a failure signal to the switching circuit 8A on its own side, and disables the interface with the process input / output device bus 10. Further, the occurrence of a failure is output to the switching logic bus 9 and transmitted to the standby CPU 1B. The standby CPU 1B receiving the information acquires the control right and starts driving the process input / output device bus 10.

[0004]

Since the conventional plant control device is configured as described above, it only switches the process input / output device between the duplicated CPUs. As described above, when a large number of plant control devices are required for each distribution, the number of CPUs is required to be twice as large as that of the plant control devices.
Further, when the power of both CPUs is turned off during a periodic inspection, there is a problem that plant control and monitoring cannot be performed during that period.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can reduce the cost by reducing the number of standby CPUs, and perform a periodic inspection of a plant control device including a process input / output device. Another object is to obtain a plant control device capable of operating and monitoring the plant.

[0006]

In a plant control apparatus according to the present invention, a process input / output device connected to a controlled plant and configured to input / output process information to / from the controlled plant; A plurality of arithmetic and control units including at least a first arithmetic and control unit and a second arithmetic and control unit connected to the process input and output unit via a network and respectively performing arithmetic processing of process information obtained by the process input and output unit And, comprising a signal line for connecting the plurality of arithmetic and control units and transmitting abnormality information, when an abnormality occurs in the first arithmetic and control unit, communicate the abnormality to the second arithmetic and control unit through the signal line, The second arithmetic and control unit performs the processing of the first arithmetic and control unit together with its own processing.

A plurality of process input / output devices including at least a first process input / output device connected to the controlled plant and configured to input / output process information to / from the controlled plant; A plurality of arithmetic controls including at least a first arithmetic control unit and a second arithmetic control unit connected to each of the plurality of process input / output devices and performing arithmetic processing of process information acquired by the process input / output devices A device and a signal line for connecting the plurality of arithmetic and control units and transmitting abnormality information, and a first arithmetic and control unit and a second arithmetic and control unit are connected to the first process input / output device, When an abnormality occurs in the first arithmetic and control unit, the abnormality is transmitted to the second arithmetic and control unit through a signal line, and the processing of the first arithmetic and control unit is performed by the second arithmetic and control unit. Is Umono.

A plurality of first process input / output devices connected to the controlled plant and configured to input / output process information to / from the controlled plant; A plurality of first arithmetic and control units connected to each of the devices and performing arithmetic processing of the process information obtained by the first process input / output device,
A third arithmetic control unit that backs up the plurality of first arithmetic control units, and a signal line that connects between the plurality of first arithmetic control units and the third arithmetic control unit and transmits abnormality information, A first arithmetic control unit and a third arithmetic control unit are connected to each first process input / output device, and when an abnormality occurs in the first arithmetic control unit, the abnormality is controlled by a third arithmetic control unit via a signal line. The processing is transmitted to the apparatus and substitutes for the processing of the first arithmetic and control unit in which an abnormality has occurred by the third arithmetic and control unit.

Further, the third arithmetic and control unit is connected to the first process input / output unit via a repeater. Further, the switching unit is connected to the first process input / output device, and the input / output terminal of the third process input / output device provided corresponding to the third arithmetic and control unit is connected to the switching unit. Things.

Also, a plurality of third process input / output devices corresponding to the third arithmetic and control unit are provided, and a plurality of first process input / output devices are provided at input / output terminals of the plurality of third process input / output devices. A plurality of switching units respectively connected to the device are connected, and one of the plurality of first process input / output devices is selected by operating the switching unit according to a control command of a third arithmetic and control unit. In addition, the signal line
It is a transmission bus to which each arithmetic and control unit is connected.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a plant control device according to Embodiment 1 of the present invention. In FIG. 1, 1 is a CPU and 11 is a plurality of CPs.
A process input / output device shared by U1 inputs and outputs process information to and from a controlled plant. Reference numeral 13 denotes a master card for interfacing with the process input / output device 11, reference numeral 14 denotes a process input / output network to which the master card 13 and the process input / output device 11 are connected, and reference numeral 15 arbitrates control of the process input / output network 14 between CPUs. This is a hard-wired signal line. B1
The BN is a distribution having a CPU 1 and a master card 13, respectively.

Next, the operation will be described. C of variance B1
When the PU 1 accesses the process input / output device 11,
First, a request to acquire the process input / output network 14 is output to the signal line 15 for arbitration. At that time, if another distribution has already acquired the process input / output network 14,
The permission signal is not output, and the CPU 1 of the distribution B1 waits for access to the process input / output device 11. When the distribution process using the process input / output network 14 is completed, a permission signal for the distribution B1 is output, and the CPU 1 of the distribution B1 starts accessing the process input / output device 11. Normally, different control calculation processes are performed for each of the variances B1 to BN. Here, if the CPU 1 of the first variance B1 goes down due to a failure, the soundness of the CPU 1 is shown in the signal line 15. By inputting a signal, it is possible to determine an abnormality of the variance B1 in another variance.

When an abnormality of the distribution B1 is detected, for example, if the second distribution B2 is programmed in advance to back up the distribution B1, the distribution B2 is set to the distribution B2 together with the abnormality detection of the distribution B1. In addition to the control calculation processing of, the control calculation processing of the variance B1 is performed. Thereby, the CPU 1
Is twice as many as the number of variances in the conventional apparatus, but can be reduced to the number of variances, and the initial cost can be reduced. Also, for example, during the periodic inspection of the distribution B1, the backup can be performed by the distribution B2, so that the control and monitoring of the plant are not interrupted.

Embodiment 2 FIG. FIG. 2 is a configuration diagram showing a plant control device according to Embodiment 2 of the present invention. In the figure, 1, 11, 13, 14, B1 to BN are the same as those in FIG. Reference numeral 16 denotes a transmission bus for transmitting arbitration information between distributions and information indicating soundness. In the first embodiment, the case where the arbitration of the process input / output network 14 and the notification of the occurrence of an abnormality in the CPU unit are described using the hard-wired signal line 15 has been described.
As shown in FIG. 2, a transmission bus 16 is provided, and information for arbitrating the process input / output network 14 and a CPU
Since the information indicating the soundness of 1 is exchanged between the distributions via the transmission bus 16, the number of signal lines between the distributions can be reduced, and the cost can be further reduced.

Embodiment 3 FIG. 3 is a configuration diagram showing a plant control device according to Embodiment 3 of the present invention. In the figure, 1, 11, 13, 14, B1 to BN are the same as those in FIG. Reference numeral 17 denotes a signal line for abnormality notification. In the first embodiment, the case where the CPU 1 of all distributions and all the process input / output devices 11 are connected by one process input / output network 14 has been described. However, in the third embodiment, as shown in FIG. The number of distributions that can access the process input / output device 11 is limited to two. For example, normally, the first process input / output device 11 is driven by the first distribution B1, and when an abnormality occurs in the distribution B1, an abnormality notification is issued. The information is output to the second distribution B2 via the signal line 17, and the distribution B2 drives the process input / output device 11 in place of the distribution B1 in addition to its own control arithmetic processing. Thereby, the process input / output network 1
Since the number of process input / output devices 11 connected to the device 4 can be limited, it is possible to speed up the transfer of process data and limit the range of influence when the process input / output network 14 fails. For this reason, the distribution B2 has two master cards 13.

Embodiment 4 FIG. 4 is a configuration diagram showing a plant control device according to Embodiment 4 of the present invention. In the figure, 1, 11, 13, 14, B1 to BN are the same as those in FIG. Reference numeral 18 denotes a hard-wired signal line for notifying an abnormality to the backup dedicated BN. In the third embodiment, the case where the backup is performed between the respective distributions has been described. In the fourth embodiment, as shown in FIG. 4, a third distribution BN dedicated to the backup is provided, and the first distribution B1 or the distribution B2 is provided. ,..., The abnormality is transmitted to the backup dedicated BN via the signal line 18 and the backup is performed by the distributed BN. And the load can be made uniform. For this reason,
In the distribution N dedicated to backup, the master cards 13 for the number of distributions are mounted.

Embodiment 5 FIG. 5 is a configuration diagram showing a plant control device according to Embodiment 5 of the present invention. In the figure, 1, 11, 13, 14 and B1 to BN correspond to FIG.
Are the same as those in. Reference numeral 19 denotes a transmission bus for performing abnormality notification. In the fourth embodiment, the variances B1, B
2. The hard-wired signal line 18 is used as a means for notifying the dispersion BN of the abnormality of...,
This is a transmission bus 1 networked as shown in FIG.
By setting it to 9, the number of cables can be reduced.

Embodiment 6 FIG. FIG. 6 is a configuration diagram showing a plant control device according to Embodiment 6 of the present invention. In the figure, 1, 11, 13, 14, 19, B1 to BN are the same as those in FIG. Reference numerals 20 are provided corresponding to the I / Os of the respective variances, and the corresponding variances (B1, B2
, BN-1) and the process input / output network 14 of the distributed BN dedicated to backup. In the fifth embodiment, a case has been described in which the master cards 13 for the number of shares are mounted on the distributed BN in order to perform backup with the distributed BN.
Is the repeater 20 corresponding to each variance, as shown in FIG.
By enabling only the distributed repeaters to be backed up, only one master card 13 can be mounted on the third distributed BN, and the facility can be simplified and the cost can be reduced. .

Embodiment 7 FIG. 7 is a configuration diagram showing a plant control device according to Embodiment 7 of the present invention. In the figure, 1, 11, 13, 14, 19, B1 to BN are the same as those in FIG. A switching unit 21 is connected to each process input / output device 11 and switches connection with the third process input / output device 11 corresponding to the third distribution dedicated to backup. In the first to sixth embodiments, the case where only the CPU unit is backed up has been described. However, in the seventh embodiment, as shown in FIG. Since the backup of the device 11 is also made possible by the distributed BN, the distribution and the periodic inspection including the process input / output device 11 become possible. In this case, by connecting the input / output terminal of the third process input / output device 11 of the backup distributed BN to the distributed switching unit 21 to be backed up, the first distributed first process input / output device 11 to be backed up. And backups are possible.

Embodiment 8 FIG. FIG. 8 is a configuration diagram showing a plant control device according to Embodiment 8 of the present invention. In the figure, 1, 11, 13, 14, 19, 21, B1
BN is the same as that in FIG. 7, and 20 is the same as that in FIG. In the seventh embodiment, the backup method including the distributed process input / output device 11 has been described. However, in the eighth embodiment, by combining this with the sixth embodiment as shown in FIG. It is possible to cope with both the backup at the time of failure and the backup including the process input / output device 11 at the time of periodic inspection. Therefore, the distribution B dedicated to the backup
N is the master card 13 connected to the repeater 20
And a master card 13 connected to the switching unit 21 via the process input / output device 11.

Embodiment 9 FIG. 9 is a configuration diagram showing a plant control device according to Embodiment 9 of the present invention. In the figure, 1, 11, 13, 14, 19, 20, 21,
B1 to BN are the same as those in FIG. 2
2 is a switching unit 2 from a distributed BN dedicated to backup.
This is a switching command to be sent to 1. In the eighth embodiment, for the backup including the process input / output device 11, the distributed BN process input / output device 1
1 had to be connected. In the ninth embodiment, as shown in FIG. 9, the number of the process input / output devices 11 of the third distributed BN is implemented by the least common multiple of the distributions 1, 2,. With the wiring inside the unit 21,
The process input / output devices 11 of each distribution can be backed up. As a result, the input / output terminal of the third process input / output device 11 of the distributed BN is always connected to the switching unit 21 of the entire distribution, and the distributed BN outputs a switching command to the switching unit 21 of the distribution to be backed up. Enables automatic switching.

[0022]

Since the present invention is configured as described above, it has the following effects. A process input / output device connected to the controlled plant and configured to input and output process information to and from the controlled plant; and a process input / output device connected to the process input / output device via a network and acquired by the process input / output device. A plurality of arithmetic and control units including at least a first arithmetic and control unit and a second arithmetic and control unit, and a signal for connecting the plurality of arithmetic and control units and transmitting abnormality information When the first arithmetic and control unit has an abnormality, the abnormality is transmitted to the second arithmetic and control unit through a signal line, and the second arithmetic and control unit performs processing of the first arithmetic and control unit together with its own processing. Therefore, there is no need to provide an extra CPU, and backup can be performed even during inspection of the first arithmetic and control unit.

A plurality of process input / output devices including at least a first process input / output device connected to the controlled plant and configured to input and output process information to and from the controlled plant; A plurality of arithmetic controls including at least a first arithmetic control unit and a second arithmetic control unit connected to each of the plurality of process input / output devices and performing arithmetic processing of process information acquired by the process input / output devices A device and a signal line for connecting the plurality of arithmetic and control units and transmitting abnormality information, and a first arithmetic and control unit and a second arithmetic and control unit are connected to the first process input / output device, When an abnormality occurs in the first arithmetic and control unit, the abnormality is transmitted to the second arithmetic and control unit through a signal line, and the processing of the first arithmetic and control unit is performed by the second arithmetic and control unit. Unode, the number of first process input and output devices can be limited.

A plurality of first process input / output devices connected to the controlled plant and configured to input / output process information to / from the controlled plant; A plurality of first arithmetic and control units connected to each of the devices and performing arithmetic processing of the process information obtained by the first process input / output device,
A third arithmetic control unit that backs up the plurality of first arithmetic control units, and a signal line that connects between the plurality of first arithmetic control units and the third arithmetic control unit and transmits abnormality information, A first arithmetic control unit and a third arithmetic control unit are connected to each first process input / output device, and when an abnormality occurs in the first arithmetic control unit, the abnormality is controlled by a third arithmetic control unit via a signal line. Since the information is transmitted to the device and the processing of the first arithmetic and control unit in which an abnormality has occurred by the third arithmetic and control unit is substituted, the load of the first arithmetic and control unit can be kept constant and the load can be made uniform. be able to.

Further, since the third arithmetic and control unit is connected to the first process input / output unit via the repeater, only one master card of the third arithmetic and control unit can be used. Further, the switching unit is connected to the first process input / output device, and the input / output terminal of the third process input / output device provided corresponding to the third arithmetic and control unit is connected to the switching unit. Therefore, backup including the first process input / output device can be performed.

A plurality of third process input / output devices corresponding to the third arithmetic and control unit are provided, and a plurality of first process input / output devices are provided at input / output terminals of the plurality of third process input / output devices. A plurality of switching units respectively connected to the device are connected, and one of the plurality of first process input / output devices is selected by operating the switching unit according to the control command of the third arithmetic and control unit. Automatic switching is possible. In addition, since the signal line is a transmission bus to which each arithmetic and control unit is connected, the number of signal lines between the arithmetic and control units can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a plant control device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a plant control device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram illustrating a plant control device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram showing a plant control device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram illustrating a plant control device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram illustrating a plant control device according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram illustrating a plant control device according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram illustrating a plant control device according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram showing a plant control device according to Embodiment 9 of the present invention.

FIG. 10 is a configuration diagram showing a conventional plant control device.

[Explanation of symbols]

1 CPU, 11 process input / output device, 13 master card, 14 process input / output network, 1
5, 17, 18 signal line, 16, 19 transmission bus, 2
0 repeater, 21 switching unit, 22 switching command, B1 to BN dispersion.

Claims (7)

[Claims] 1. A plant control device having an arithmetic and control unit for controlling a controlled plant by inputting and outputting process information via a process input / output device, wherein the plant control device is connected to the controlled plant and communicates with the controlled plant. A process input / output device configured to input and output process information, connected to the process input / output device via a network and performing an arithmetic process on the process information obtained by the process input / output device, respectively, A plurality of arithmetic and control units including an arithmetic and control unit and a second arithmetic and control unit,
A signal line for connecting the plurality of arithmetic and control units and transmitting abnormality information is provided, and when an abnormality occurs in the first arithmetic and control unit, the abnormality is transmitted to the second arithmetic and control unit through the signal line, A plant control device wherein the second arithmetic and control unit performs the processing of the first arithmetic and control unit together with its own processing. 2. A plant control device having an arithmetic and control unit for controlling a controlled plant by inputting and outputting process information via a process input / output device, wherein the plant control device is connected to the controlled plant and communicates with the controlled plant. A plurality of process input / output devices including at least a first process input / output device each configured to input and output process information, connected by each of the plurality of process input / output devices, Perform arithmetic processing of the acquired process information, a plurality of arithmetic control devices including at least a first arithmetic control device and a second arithmetic control device,
A signal line for connecting the plurality of arithmetic and control units and transmitting abnormality information is provided, a first arithmetic and control unit and a second arithmetic and control unit are connected to the first process input / output device, and the first A plant control, wherein when an abnormality occurs in the arithmetic and control unit, the abnormality is transmitted to a second arithmetic and control unit through a signal line, and the processing of the first arithmetic and control unit is performed by the second arithmetic and control unit. apparatus. 3. A plant control device having an arithmetic and control unit for controlling a controlled plant by inputting and outputting process information via a process input / output device, wherein the plant control device is connected to the controlled plant and communicates with the controlled plant. A plurality of first process input / output devices configured to input and output process information, and connected to each of the plurality of first process input / output devices and acquired by the first process input / output device A plurality of first arithmetic and control units for performing arithmetic processing of the process information, a third arithmetic and control unit for backing up the plurality of first arithmetic and control units, the plurality of first arithmetic and control units, and a third arithmetic operation A signal line for transmitting abnormal information by connecting the control devices is provided, and a first arithmetic control device and a third arithmetic control device are connected to each first process input / output device, and the first process input / output device is connected to the first process input / output device. When an error occurs in the arithmetic and control unit,
The above-mentioned abnormality is transmitted to the third arithmetic and control unit through a signal line,
A plant control device, wherein the processing of the first calculation control device in which the abnormality has occurred is replaced by the third calculation control device. 4. The plant control device according to claim 3, wherein the third arithmetic control device is connected to the first process input / output device via a repeater. 5. A switching unit is connected to the first process input / output device, and the switching unit has an input / output terminal of a third process input / output device provided corresponding to the third arithmetic and control unit. The plant control device according to claim 3 or 4, wherein the plant control device is connected. 6. A plurality of third process input / output devices corresponding to a third arithmetic and control unit are provided, and a plurality of first process input / output devices are provided at respective input / output terminals of the plurality of third process input / output devices. A plurality of switching units respectively connected to the output device are connected, and one of the plurality of first process input / output devices is selected by operating the switching unit according to a control command of a third arithmetic and control unit. The plant control device according to claim 3 or 4, wherein 7. The plant control device according to claim 1, wherein the signal line is a transmission bus to which each operation control device is connected.