JP2001188603A - Plant control system, and method of increasing or decreasing process input/output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to increase or decrease input/output(I/O) devices in a plant control system and check to confirm and control communications without stopping a process. SOLUTION: In the plant control system doubling central processing units(CPUs) and buses, an unused bus 32 is used as a bus for confirming or controlling communications to execute the connection or separation of a process I/O device 23 and the update of software in the CPU one side system at a time, so that the number of process I/O devices 23 can be increased or decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant control system for power generation, substation, steelmaking, papermaking, etc., and more particularly to a system having a dual central processing unit (CPU) and a bus without stopping processes. It relates to adding or deleting a process input / output device.

[0002]

2. Description of the Related Art In a power plant or an industrial plant that supports a social infrastructure, a huge investment is required to change the operation after the start of operation and to newly install a larger plant. There are many cases where a plant is partially expanded or renewed for various reasons, such as performing only a partial modification. Similarly, a plant control system that controls a plant process may need to be added or updated. Generally, even in the case of the extension / renewal work of the plant control system, the work is performed by stopping the process and stopping the operation of the plant. However, shutting down a plant that is in operation implies a reduction in power supply and a reduction in product manufacturing capacity for that purpose, and is often undesirable in nature.

FIG. 17 is a schematic diagram of a general plant control system. A central processing unit (CPU) 1 for performing arithmetic processing of the system and a process input / output device (PIO) for inputting and outputting data from the plant. 2 is connected by a bus 3 for transmitting a control signal. In such a system form, even if only a process input / output device (PIO) is added due to a change in plant operation, the central processing unit (CPU) and the bus must be stopped to perform construction work. Therefore, it is necessary to stop the plant control system, and thus the whole plant needs to be stopped.

FIG. 18 is, for example, Japanese Patent Application Laid-Open No. 3-261244.
A plurality of computers disclosed in Japanese Unexamined Patent Publication No.
This is an example of a system connected by an area network (Area Network). In the figure, CPU 41 is an existing computer, C
The PU 42 is a computer to be added. Also, the bus 51,
52 is a local area network (LAN) connecting the CPU 41 and the CPU 42.

In FIG. 18, buses (LAN) 51, 5
2 is duplicated, and one LAN 51 is set in the operation state and the other LAN 52 is set in the failure state, so that even when the computer 42 is added, the expansion can be performed without stopping the entire system.

That is, in FIG. 18, the LAN 51 is set to the operation state, the LAN 52 is set to the failure state, and the CP to be newly added is set.
U42 is connected to the LAN 52 in the failed state. Then, L
The AN 52 is set to the operation state, the LAN 51 is set to the failure state,
The CPU 42 is connected to the LAN 51.

[0007]

As described above, the conventional plant control system and computer system can be added without stopping the system. However, before starting the actual operation, the computer (CPU) needs to confirm whether signals with the process input / output device (PIO) are normally transmitted and received.
O) requires an adjustment of input / output signals in order to be an interface with the process. Therefore, unlike a system such as a computer that operates only when an event occurs, the bus is simply
It is practically impossible to increase the number of processes without stopping the process only by multiplexing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is a system capable of adding / deleting an input / output device (PIO) of a plant control system and confirming / adjusting communication without stopping a process. The purpose is to obtain the configuration and its method.

[0009]

According to a first aspect of the present invention, there is provided a plant control system for controlling a process, wherein a system which has a dual central processing unit and a bus includes a bus which is not operated. A plant control system that can be used for communication confirmation or adjustment, and can add new process input / output devices by connecting the process input / output devices and updating the software of the central processing unit one by one. .

According to a second aspect of the present invention, there is provided a plant control system for controlling a process, wherein in a system including a dual central processing unit and a bus, a process input / output device is separated and a central processing unit is provided. This is a plant control system that can delete an existing process input / output device by updating software one by one.

According to a third aspect of the present invention, there is provided a plant control system for controlling a process. In a system including a duplicated central processing unit, a bus, and a process input / output device, a test operation of an unoperated bus is performed. Or a plant control system that can be used for adjustment and that can add a new process input / output device by connecting the redundant process input / output device and updating the software of the central processing unit one by one. is there.

According to a fourth aspect of the present invention, there is provided a plant control system for controlling a process, wherein the system includes a duplicated central processing unit, a bus, and a process input / output device. This is a plant control system capable of deleting an existing process input / output device by performing one-by-one disconnection and software update of the central processing unit.

According to a fifth aspect of the present invention, in a plant control system for controlling a process, a central processing unit and a bus are duplicated, and an unoperated bus is used for communication confirmation or adjustment. A new process input / output device is added by performing the connection and updating the software of the central processing unit one by one.

According to a sixth aspect of the present invention, in a plant control system for controlling a process, a central processing unit and a bus are duplicated, and a process input / output unit is separated and software of the central processing unit is updated one by one. By doing so, the existing process input / output device is deleted.

According to a seventh aspect of the present invention, in a plant control system for controlling a process, a central processing unit, a bus, and a process input / output device are duplicated, and an unoperated bus is used for trial operation or adjustment. A new process input / output device is added by connecting the redundant process input / output device and updating the software of the central processing unit one by one.

According to an eighth aspect of the present invention, in a plant control system for controlling a process, a central processing unit, a bus, and a process input / output unit are duplicated, and the dual process input / output unit is separated and a central processing unit. By updating the software one by one, the existing process input / output device is deleted.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, a plant control system according to a first embodiment of the present invention will be described with reference to the drawings. In FIG. 1, CPUs 11 and 12 are duplicated central processing units, and PIOs 21 and 22 are existing process input / output devices. And these CPUs
11, 12, and PIOs 21 and 22 are connected to duplex buses 31 and 32, respectively. Also, PIO23
Is a process input / output device which is newly added to this system, and needs to be connected to duplex buses 31 and 32. Since the PIOs 21, 22, and 23 are process input / output devices each serving as an interface with the plant, there is no communication between the PIOs 21, 22, and 23. Further, the bus control units, which are provided in the PIOs 21, 22, and 23 and serve as interfaces with the buses, are independent for each bus to be connected.

In this embodiment, each CPU,
Each of the PIO and the bus has three states of an "operation state", a "standby state", and an "exclusion state", and the "operation state" and the "standby state" constitute a standby redundant duplex system. The “operation state” is a state of operation for actual operation. The “standby state” is a state in which the operation state can be shifted to the operation state at any time. If the CPU (or bus or PIO) in the operation state becomes unexecutable for some reason, the operation state becomes the operation state without the operation of the operator, and the operation state is originally set to the operation state CPU
(Or bus, PIO) is in a standby state or an excluded state. The “exclusion state” is a state in which the system is disconnected from the system, and does not output to a process.

Next, a process input / output device (PIO) 23
The method for adding the above will be described. In FIG. 1, a CPU 1
1, the PIO 21, the PIO 22, and the bus 31 are in the operating state, and the CPU 12 and the bus 32 are in the standby state. First, C
The PU 12 and the bus 32 are removed from the standby state and disconnected from the system. Next, as shown in FIG.
3 is connected to the bus 32, and the software after the addition of the PIO 23 is incorporated in the CPU 12. In this state, the CPU 11
With the PIO21, PIO22, and bus 31 operating,
The communication between the CPU 12, the bus 32, and the PIO 23 is confirmed and adjusted. After confirmation and adjustment are completed, as shown in FIG. 3, the CPU 12, PIO21, PIO22, bus 32
Is set to the operation state, the CPU 11 and the bus 31 are set to the standby state, and further switched to the exclusion state to be disconnected from the system.
At this time, the PIO 23 is not set to the operation state. As before, the PIO 23 is connected to the bus 31 and the CPU 11
The software after O23 expansion is installed. In this state, C
While the PU 12, the PIO 21, the PIO 22, and the bus 32 are in operation, the communication confirmation and adjustment are performed by the CPU 11, the bus 32, and the PIO 23. After confirmation and adjustment are completed, as shown in FIG. 4, the PIO 23 is set to the operation state, and the CPU 11 and the bus 31 are set to the standby state.

As described above, according to the first embodiment, in a plant control system having a dual central processing unit (CPU), a bus, and a single process input / output device (PIO), It is possible to add a new process input / output device (PIO) without stopping the operation.

Embodiment 2 FIG. In the first embodiment, the case where the process input / output device is newly added without stopping the plant operation has been described. In the second embodiment, the case where the existing process input / output device is deleted from the plant control system. explain.

Here, a method of deleting the input / output device (PIO) 22 will be described. In FIG. 5, the CPU 11,
PIO21, PIO22, and bus 31 are in operation,
The CPU 12 and the bus 32 are in a standby state. Here, first, the CPU 12, the PIO 22, and the bus 32 are excluded from the standby state and are disconnected from the system. Next, as shown in FIG. 6, the PIO 22 is disconnected from the bus 32,
12 incorporates the software after the PIO 22 is deleted.
Next, as shown in FIG. 7, the CPU 12, the PIO 21, and the bus 32 are set to the operating state, and the CPU 11, the bus 31 are switched to the standby state, and further to the exclusion state, and are separated from the system. Then, similarly to the above, the PIO 22 is disconnected from the bus 31, and the software after the PIO 22 is deleted is incorporated in the CPU 11. Then, as shown in FIG.
1. Put the bus 31 in a standby state.

As described above, according to the second embodiment, in a plant control system having a duplicated central processing unit (CPU) and a bus, the existing process input / output device can be used without stopping the operation of the process. (PIO) can be deleted.

Embodiment 3 FIG. In the above-described embodiment, the method of adding or deleting a single process input / output device without stopping the plant operation has been described. In the third embodiment, however, the bus control unit of the process input / output device (PIO) has one bus control unit. Process input / output device (PIO) without stopping process operation
Provide a system that can be added.

In FIG. 9, CPUs 11 and 12 are duplicated central processing units, PIOs 21 and 22 are existing process input / output devices, and PIOs 23 and 24 are also duplicated process input / outputs. Device. And
Reference numerals 31 and 32 denote duplex buses.
PIO21 and PIO23 are connected to the bus 31,
The CPU 12, the PIO 22, and the PIO 24 are connected to the bus 32. Here, the PIOs 25 and 26 are duplicated process input / output devices newly added to the system.
It is necessary to connect to buses 31 and 32, respectively. In addition,
Since the PIOs 21, 22, 23, 24, 25, and 26 are process input / output devices serving as an interface with the plant, PIOs 21, 23, and 25, and PIOs 22 and 2,
There is no communication between 4 and 26.

Next, a method of adding the duplex process input / output devices 25 and 26 will be described. In FIG. 9, the CPU
11, PIO21, PIO23, bus 31 are in operation state,
The CPU 12, the PIO 22, the PIO 24, and the bus 32 are in a standby state. First, the CPU 12, PIO22, PIO2
4. The bus 32 is removed from the standby state and disconnected from the system. Next, as shown in FIG. 10, the PIO 26 is connected to the bus 32, and the software after the PIO 26 is added is incorporated in the CPU 12. In this state, the CPU 11, PI
While the O21, PIO23, and bus 31 are operating, the CP
The communication between the U12, the bus 32, and the PIO 26 is confirmed and adjusted. After the confirmation and adjustment are completed, as shown in FIG. 11, the CPU 12, the PIO 22, the PIO 24, and the bus 32 are put into the operating state, and the CPU 11, the PIO 21, the PIO 23,
The bus 31 is switched to the standby state and further to the exclusion state, and is disconnected from the system. At this time, since the PIO 26 is independent of the PIO 25, the operation may be started in some cases. Next, the PIO 25 is connected to the bus 31, and the software after the addition of the PIO 25 is incorporated in the CPU 11. In this state, the CPU 12, the PIO 22, the PIO 24, the bus 32
(In some cases, PIO 26) while operating
Confirmation and adjustment of communication between U11, bus 31, and PIO 25 are performed. After the confirmation and the adjustment are completed, the operation of the PIO 26 is started as shown in FIG.
1. Put the PIO 23, PIO 25, and bus 31 in a standby state.

As described above, according to the third embodiment, in a plant control system having a duplicated central processing unit (CPU) and a bus, a duplex process input / output can be performed without stopping the operation of the process. It is possible to increase the number of devices (PIO).

Embodiment 4 In the fourth embodiment, in a system in which the bus control unit of the process input / output device (PIO) is one and the PIO is duplicated, the process input / output device (PIO) can be deleted without stopping the operation of the process. Provide a system that can

In the third embodiment (FIGS. 9 to 12), the case where the process input / output devices 25 and 26 are added without stopping the plant operation has been described. 12, PIO21, 22, P
A case where the process input / output devices 23 and 24 are deleted in a system having IOs 23 and 24 and buses 31 and 32 will be described.

In FIG. 13, the CPU 11, PIO2
1, PIO 23, bus 31 are operating, CPU 12, P
The IO 22, the PIO 24, and the bus 32 are in a standby state. First, the CPU 12, the PIO 22, the PIO 24, and the bus 32 are removed from the standby state and disconnected from the system. Next, as shown in FIG. 14, the PIO 24 is disconnected from the bus 32, and the software after the PIO 24 is deleted is incorporated in the CPU 12. Next, as shown in FIG.
2, the PIO 22 and the bus 32 are put into operation, and the CPU 1
1. Put the PIO21, PIO23, and bus 31 in the standby state,
Then switch to the exclusion state and disconnect from the system. Next, the PIO 23 is disconnected from the bus 31, and the software after the deletion of the PIO 23 is incorporated in the CPU 11. Then, as shown in FIG. 16, the CPU 11, the PIO 21, and the bus 31 are set in a standby state.

As described above, according to the fourth embodiment, the operation of a process is stopped in a plant control system having a dual central processing unit (CPU), a bus, and a process input / output device (PIO). The deletion of the process input / output device (PIO) can be performed without the need.

[0032]

According to the first and fifth aspects of the present invention,
In a plant control system having a duplicated central processing unit (CPU) and a bus, a new process input / output device (PIO) can be added without stopping the operation of the process.

According to the second and sixth aspects of the present invention, two
In a plant control system having a redundant central processing unit (CPU) and a bus, an existing process input / output device (PIO) can be deleted without stopping the operation of the process.

According to the third and seventh aspects of the present invention, 2
In a plant control system having a redundant central processing unit (CPU) and a bus, it is possible to add a redundant process input / output device (PIO) without stopping the operation of the process.

According to the fourth and eighth aspects of the present invention, 2
In a plant control system having a redundant central processing unit (CPU), a bus, and a process input / output device (PIO), the process input / output device (PIO) can be deleted without stopping the operation of the process. Becomes

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing Embodiment 1 of the present invention, in a state before a process input / output device is added.

FIG. 2 is a system configuration diagram showing the first embodiment of the present invention, in a state where a process input / output device is being added.

FIG. 3 is a system configuration diagram showing the first embodiment of the present invention, in a state where a process input / output device is being added;

FIG. 4 is a system configuration diagram showing the first embodiment of the present invention, in a state after a process input / output device is added.

FIG. 5 is a system configuration diagram showing Embodiment 2 of the present invention, in a state before a process input / output device is deleted.

FIG. 6 is a system configuration diagram showing Embodiment 2 of the present invention, in a state where a process input / output device is being deleted.

FIG. 7 is a system configuration diagram showing Embodiment 2 of the present invention, in a state where a process input / output device is being deleted.

FIG. 8 is a system configuration diagram showing Embodiment 2 of the present invention, in a state after a process input / output device is deleted.

FIG. 9 is a system configuration diagram showing Embodiment 3 of the present invention, in a state before a process input / output device is added.

FIG. 10 is a system configuration diagram showing Embodiment 3 of the present invention, in a state where a process input / output device is being added.

FIG. 11 is a system configuration diagram showing Embodiment 3 of the present invention, in a state where a process input / output device is being added.

FIG. 12 is a system configuration diagram showing Embodiment 3 of the present invention, in a state after a process input / output device is added.

FIG. 13 is a system configuration diagram showing a fourth embodiment of the present invention, in a state before a process input / output device is deleted.

FIG. 14 is a system configuration diagram showing Embodiment 4 of the present invention, in a state where a process input / output device is being deleted.

FIG. 15 is a system configuration diagram showing Embodiment 4 of the present invention, in a state where a process input / output device is being deleted.

FIG. 16 is a system configuration diagram showing Embodiment 4 of the present invention, in a state after a process input / output device is deleted.

FIG. 17 is a configuration diagram showing a conventional plant control system.

FIG. 18 is a system configuration diagram showing a conventional computer system and a local area network.

[Explanation of symbols]

11, 12 central processing unit (CPU), 21,
2,23,24,25,26 Process input / output device (P
IO), 31, 32, 33, 34 bus.

Claims (8)

[Claims] Claims: 1. A plant control system for controlling a process, comprising: a system having a duplicated central processing unit and a bus; A plant control system capable of adding a new process input / output device by connecting an output device and updating software of the central processing unit one by one. 2. A plant control system for controlling a process, comprising: a system having a duplicated central processing unit and a bus; A plant control system that can delete existing process input / output devices by performing each process. 3. A plant control system for controlling a process, wherein a non-operating bus is used for trial operation or adjustment in a system including a duplicated central processing unit, a bus, and a process input / output device. And
A plant control system capable of adding a new process input / output device by connecting the duplicated process input / output device and updating the software of the central processing unit one by one. 4. A plant control system for controlling a process, comprising: a system having a duplicated central processing unit, a bus, and a process input / output device. A plant control system capable of deleting an existing process input / output device by updating software of a treatment device one by one. 5. In a plant control system for controlling a process, a central processing unit and a bus are duplicated, an unoperated bus is used for communication confirmation or adjustment, connection of a process input / output device and central processing. A method of adding a process input / output device of a plant control system in which a new process input / output device is added by updating software of the device one by one. 6. In a plant control system for controlling a process, a central processing unit and a bus are duplicated, and a process input / output device is separated and software of the central processing unit is updated one by one, so that an existing system is controlled. A method for deleting a process input / output device of a plant control system for deleting a process input / output device. 7. In a plant control system for controlling a process, a central processing unit, a bus, and a process input / output device are duplicated, and an unoperated bus is used for trial operation or adjustment, and a duplicate process input / output is used. A method of adding a process input / output device of a plant control system in which a new process input / output device is added by connecting devices and updating software of the central processing unit one by one. 8. In a plant control system for controlling a process, a central processing unit, a bus, and a process input / output unit are duplicated to separate the duplicated process input / output unit and update software of the central processing unit. A method of deleting a process input / output device of a plant control system that deletes an existing process input / output device by performing each system.