JPH04120601A - Controlling system for multiplex controller - Google Patents

Abstract

PURPOSE:To multiplex common process input-output processors so as to improve the reliability of a multiplex controller controlling system when the controlling system is operated for purposes other than the normal loaded operation by inputting/outputting common process signals after switching the controller used for the input-output of the signals to one controller selected out of multiplex controllers. CONSTITUTION:The inputting/outputting process of common process input-output signal is made by means of one controller selected out of triplex controllers (1-1)-(1-3) and, at the same time, a switching circuit 23 is provided so that the common process input-output signals can be inputted/outputted by switching the controller to one of the controllers (1-1)-(1-3). Accordingly, when one of the controllers (1-1)-(1-3) becomes faulty, the input-output of the common process input-output signals can be performed through another normal controller. Therefore, multiplex common process input-output processors are substantially realized and the reliability of this multiplex controller controlling system is improved when the controlling system is used for purposes other than the normal loaded operation, such as actuation control, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a multiplex controller control system, and relates to one suitable for, for example, a control system for a turbine plant such as a thermal power plant or a nuclear power plant.

[Conventional technology]

In conventional plant control, controllers are multiplexed to increase reliability (Japanese Patent Application Laid-Open No.
-35202 publication, JP-A-56-38601 publication,
(Japanese Unexamined Patent Publication No. 16301/1983). For example, by tripling the controllers of a gas turbine, operating these controllers in parallel, and determining the actual control signal to be output using logic such as majority voting based on these 8-power signals, Efforts are made to prevent erroneous control. In such a triplex control system, it is most reliable if all process signals related to control are processed by the triplex controller.

[Problem to be solved by the invention]

However, in order to input and output process signals to the controller, a process input/output bag M (hereinafter referred to as PIlo) is required as an interface, and as the number of process signals increases, the number of PIlo becomes enormous, and the mounting space is required. This will increase the size and cost.

In this regard, for example, important process signals (hereinafter referred to as important signals) that may lead to a trip during load operation of the gas turbine are input and output to the triple system controller, respectively.
On the other hand, regarding process signals such as sequence signals and monitoring signals that are not necessary to continue load operation (hereinafter referred to as common process signals or common process input/output signals),
If a common process input/output processing controller separate from the above-mentioned triple system controller is provided and input is made to the triple system controller via this process input/output processing controller, the PIlo of the common process signal can be reduced by 3 times. It can be reduced to 1. In particular, since common process signals generally have more signal points than important process signals, they contribute to reducing the number of PI10.

However, if there is a single common process input/output processing controller as described above, if the common process input/output processing controller fails during startup before starting load operation, three
Even if the load controller is healthy, the plant will stop, which poses a problem in terms of system reliability. Of course, it is not possible to monitor when it is stopped or to start it.

An object of the present invention is to solve the above conventional problems, and is a control system for a multiplexed controller that can reduce the number of PI10 points and ensure sufficient reliability even before load operation such as during startup. Our goal is to provide the following.

[Means to solve the problem]

In order to achieve the above object, the present invention executes a control operation based on a process input signal input from a controlled object,
In a multiplexed controller system in which controllers that output process control signals to the controlled object based on the results of the control calculation are multiplexed, the process input signal and the process control signal are determined based on the importance of the controlled object.

Separate into important process signals and common process signals.

Important process signals are input/output to the multiplexed controllers in parallel, and the common process signals are input/output to at least one of the multiplexed controllers via a switching circuit. shall be.

[Effect]

With this configuration, according to the present invention, the above object is achieved through the following actions.

Input/output processing of the common process signal is performed by one of the multiplex controllers selected by the switching circuit. As a result, even if one of the controllers fails,
Since input/output processing can be performed by a healthy controller, the reliability of the control system is improved in operations other than normal load operation such as startup control. Further, since one controller is selected by the switching circuit to input and output the common process signal, the number of input/output points corresponding to one process input/output device is sufficient, and the mounting space can be reduced.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a triple controller control system to which the present invention is applied. The controller is A-system controller 1-1. B system controller 1-2゜C system controller 1
-3 systems operate in parallel, and each system performs the same control calculation. Furthermore, each system is independent, and as is well known, even if one system fails, the plant or the like to be controlled will operate normally due to the process control outputs of the controllers of the other two systems. Further, each controller 1-1 to 1-3 has a fault diagnosis means 1.
-1.1-2. It has l-3. This failure diagnosis 1-
For steps 1 to 1-3, well-known methods can be applied, such as a method for the controller to self-diagnose, a method for detecting measurement deviation from the process, etc. In short, it can be determined that the own process control output is abnormal. Any device that has the function to do so may be sufficient.

Important process signals from a plant 3 such as a gas turbine power generation plant to be controlled are transmitted to each controller 1- via transmission lines 4-1 to 4-3 and a plurality of (7) P105-1 to 5-3. 1 to 3 are entered. here,
The important process signal refers to a process signal that is indispensable for normal operation control of the plant 3. For example, it refers to process signals that can lead to plant shutdown, and in the case of gas turbine plants, in addition to signals that can cause tripping or damage to the main engine, there are also master signals, lubrication oil pressure signals, speed signals,
These include exhaust temperature signals and fuel control signals. The process control outputs from each of the controllers 1-1 to 1-3 are output to the controlled equipment of the plant 3 through the reverse route.

On the other hand, process signals that do not directly affect the normal operation control of the plant (common process signals) are
is input to the switching circuit 23 via the transmission line 21 and the plurality of common PIs 1022, and via this switching circuit 23, the PI 105- of any of the triplex controllers 1-1 to 1-3 is inputted.
1 to 5-3 are input. Switching circuit 2
3 is an output controller changeover switch 24, and a transmission path 25 from this switch 24 to each PI 105-1 to 5-3.
Open/close switches 25-1 to 25-2 inserted in -1 to 25-3
5-3.

The output controller changeover switch 24 is the fault diagnosis means 5-
One healthy controller is selected based on signals 1 to 5-3. Each open/close switch 26-1
-26-3 correspond to the controllers 1-1 to 1-3, respectively, and when those controllers 1-1 to 1-3 fail, based on the commands of the failure diagnosis means 2-1 to 2-3 It is now open to the public. Note that the common process input/output signals include, for example, in the case of a gas turbine plant, a process signal related to sequence control, a process signal for supervisory control, etc.

Each controller 1-1 to 1-3 processes the input common process input signal into a signal suitable for use in control calculations of each controller 1-1 to 1-3, and conversely processes the common process input signal into a signal suitable for use in control calculations of each controller 1-1 to 1-3. It has a common process signal input/output processing function that processes signals suitable for the controlled equipment. In the embodiment of FIG. 1, this function is performed by the selected controller 1-1, 1-2 or 1-3. When one of them fails, another healthy controller takes its place and performs common process signal input/output processing. The processed common process input signals are input to other controllers via system bus 31. On the other hand, the common process control output is output to the plant 3 via the switching circuit 23.

As described above, according to this embodiment, the input/output processing of the common process input/output signal is performed by one of the selected triplex controllers 1-1 to 1-3, and the switching circuit 23 is provided to switch the common process input/output signal to any one of the selected triplex controllers 1-1 to 1-3 for input/output.
Even if a failure occurs in controllers 1 to 1-3, processing can be performed by other healthy controllers. Therefore, the common process input/output processing devices are essentially multiplexed, and reliability in operations other than normal load operation such as start-up control is improved. In addition, since the input/output is switched by the switching circuit 23, PIlo does not need to correspond to each controller 1-1 to 1-3, and the number of points required for one controller is sufficient, so the mounting space is reduced.
Cost reduction can be achieved.

Note that the present invention is not limited to the above-mentioned triplex controller control system, and is not limited to the triplex controller control system described above.
The same effect can be achieved even when applied to a multiple controller control system. FIG. 3 shows a configuration diagram of a triple controller system to which a more specific embodiment of the switching circuit 23 is applied. . As shown, the switching circuit 23
is an input/output changeover switch 27 that switches input and output of a common process input/output signal, and a serial/parallel signal (S
/P) converter 28 and parallel/serial signal (P/S
) converters 29-1 to 29-3 are added.

With this configuration, the input/output switch 27 of the switching circuit 23 is set to the input side for inputting the common process input/output signal. Thereby, the common process input signal from the common PI 1022 is once converted into a parallel signal by the serial/parallel converter 28. And A,
It is divided into three parts corresponding to the B and C system controllers 1-1 to 1-3, and each is connected to a parallel/serial converter 29-.
1 to 29-3 are converted into serial signals and input to the respective controllers 1-1 to 1-3. For the output, the process control output of each controller 1-1 to 1-3 is outputted from the input/output changeover switch 28 of the changeover circuit 23, and the controller changeover switch 24 outputs the process control output from the A system, B system,
Select one of the C-system controllers 1-1 to 1-3. Also, at this time, the selection of the output controller selector switch 24 is as described above for the A-system, B-system, and C-system controllers 1-1.
The failure diagnosis means 2-1 to 2-3 of ~1-3 always select the output from a healthy controller.6For example, A system, B system, C farce controller 1-1~
If all controllers 1-3 are healthy, select any healthy controller from the A, B, and C systems. Further, if system A is abnormal and systems B and C are healthy, the output controller selector switch 24 selects either the healthy system or system C. In this way, the system as a whole can operate normally without causing any disturbance to the plant.
It becomes possible to continue normal operation.

〔Effect of the invention〕

As explained above, according to the present invention, input/output processing of a common process signal is performed by one of the selected multiplex controllers.
In addition, a switching circuit was provided to switch the input/output of the common process signal to one of the selected multiplex controllers for input/output.
Even if a failure occurs in a controller, processing can be performed by another healthy controller. Therefore, the common process input/output processing devices are essentially multiplexed, and reliability in operations other than normal load operation such as start-up control is improved.

In addition, since the input/output is switched by a switching circuit, PIlo does not need to correspond to each controller, and only the number of points required for one controller is sufficient, which reduces the mounting space and reduces costs. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a triple controller control system according to an embodiment of the present invention, FIG. 2 is a block diagram of an n-layer controller control system according to another embodiment of the present invention, and FIG. 3 is a diagram similar to that shown in FIG. FIG. 3 is a configuration diagram of another example of the switching circuit of the example. 1-1 to 1-n... Controller, 2-1 to 2-n... Failure diagnosis means, 3... Plant. 5-1 to 5-n... Process input/output device (P22...
・Common PI10. 23...Switching circuit, 24...Output controller selection switch, 27...
Input/output switch. Engineering/○),

Claims (1)

[Claims] 1. A controller that executes a control calculation based on a process input signal input from a controlled object and outputs a process control signal to the controlled object based on the result of this control calculation is multiplexed. In the multiplexed controller system, the process input signals and process control signals are classified into important process signals and common process signals based on the importance of the control target, and the important process signals are transmitted to the multiplexed controller. A multiplexed controller control system which inputs and outputs in parallel, and inputs and outputs the common process signal to at least one of the multiplexed controllers via a switching circuit. 2. The multiplex controller according to claim 1, wherein each of the controllers is equipped with a self-diagnosis means, and the switching circuit selects a healthy controller based on the diagnosis result output from the self-diagnosis means. controller control system. 3. The multiplexing system according to claim 1, wherein the controller that performs input/output processing of a common process signal among the controllers outputs the processed common process input signal to another controller. controller system. 4. Comprising multiplexed controllers, process input/output devices connected to each controller, and self-diagnosis means provided in each controller,
Each of the controllers executes a control calculation based on a process input signal inputted through the process input/output device, and performs process control on the control target via the process input/output device based on the result of the control calculation. In a multiplexed controller system that outputs signals, the process input signals and process control signals are classified into important process signals and common process signals based on the importance of the control target, and the important process signals are classified into the multiplexed process signals. The common process signal is input/output to at least one controller of the multiplexed controllers via a switching circuit, and the switching circuit is configured to input/output the common process signal to at least one of the multiplexed controllers in parallel, and the switching circuit is configured to input/output the common process signal to at least one of the multiplexed controllers via a switching circuit. A multiplex controller control system characterized in that a controller to which the common process signal is input/output is selected based on the result.