JP2704656B2 - Digital controller system - Google Patents

Description

The present invention relates to a digital controller system, and in particular, to a digital controller system.
The present invention relates to a digital controller system suitable for controlling a plurality of digital controllers according to the same control command.

[Conventional technology]

In a power plant or the like, a plurality of digital controllers are installed for each system, and various controls of the plant are performed by operating the digital controllers of each system in parallel.
That is, when one of the controllers in the controller group fails, the other controller controls the plant.

[Problems to be solved by the invention]

However, in the above-described conventional technology, when a test is performed on a controller group for each system, no consideration is given to simultaneously testing each controller. There is a problem that the control logic of the on-roller proceeds and the processing contents between the controllers cannot be related.

Examples of this type of apparatus include JP-A-62-82401 and JP-A-62-262102.

An object of the present invention is to provide a digital controller system that can execute processes of a controller group of the same system in relation to each other.

[Means for solving the problem]

In order to achieve the above object, the present invention provides, as a first system, a simulated signal generator for generating a simulated signal, and a plurality of controllers connected to a signal transmission path, and one of the controllers responds to a command. A maintenance mode designation signal generating means for outputting a maintenance mode designation signal; a first selection for receiving a command signal from the signal transmission path and the simulation signal, and selecting and outputting a signal according to a selection command among these signals; Means for selecting a simulation signal by inputting a maintenance mode designation signal, and otherwise selecting a command signal from a signal transmission path to the first selection means; and first selection means. A first control means for controlling a control target by the output signal of the other, the other controller receives a command signal from a signal transmission path and an output signal of the first selection means, A second selection means for selecting and outputting a signal according to the selection command among these signals, and selecting a signal from the first selection means by inputting a maintenance mode designation signal from the one controller, A digital controller including a second selection instructing means for instructing the second selecting means to select a command signal from the signal transmission path, and a second control means for controlling an object to be controlled by an output signal of the second selecting means This is a system configuration.

As a second system, a simulated signal generator for generating a simulated signal, and a plurality of controllers connected to a signal transmission path, wherein each controller outputs a maintenance mode specifying signal in response to a command Selection means for receiving a command signal from the signal transmission path and the simulation signal, selecting and outputting a signal in accordance with the selection command among these signals, and selecting the simulation signal by inputting the maintenance mode designation signal. In other cases, the digital controller system includes a selection command unit that commands the selection unit to select a command signal from the signal transmission path to the selection unit, and a control unit that controls a control target by an output signal of the selection unit. Things.

As a third system, a simulated signal generator for generating a simulated signal, and a plurality of controllers connected to a signal transmission line, wherein each controller outputs a maintenance mode specifying signal in response to a command. Selection means for receiving a command signal from the signal transmission path and the simulation signal, selecting and outputting a signal in accordance with the selection command among these signals, and selecting the simulation signal by inputting the maintenance mode designation signal. Otherwise, selection command means for instructing the selection means to select a command signal from the signal transmission path, an output signal of the selection means of the own system controller, and an output signal of the selection means of the other system controller are received. Determining means for outputting a normal signal among these signals, and control means for controlling a control target by an output signal of the determining means. It is obtained by constituting the digital controller system.

[Action]

When the mode for each controller is set to the maintenance mode in order to execute maintenance for each controller, a simulation signal is input to the controller instead of the command signal from the signal transmission path. The control target of one controller is controlled based on the simulation signal, and a signal generated based on the simulation signal is input to the other digital controller, and the control target of the other controller is controlled by the signal. You. This allows the control logic of each controller to proceed at the same time in the maintenance mode, so that the contents of each controller can be processed in relation to each other.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, each system is provided with controllers C10, C11,..., C20, C21 in order to control various systems of the power plant by two digital controllers. The digital controllers C10 ... C20 are connected to the multiplex transmission line 10, and the digital controllers C11 ... C
Reference numerals 21 are respectively connected to the multiplex transmission lines 12. Controllers C10 and C11 are provided for controlling the control targets of the same system, and each controller includes a maintenance mode signal generator 14A, 14B, a soundness determination circuit 16A, 16
B, signal changeover switches 18A and 18B, judgment circuits 20A and 20B, and control circuits 24A and 24B are provided.The soundness circuit 16A is connected to the transmission line 10, the soundness 16B is connected to the transmission line 12, and the signal switching is performed. The switch 18A and the maintenance mode generator 14A are connected to the simulation signal generator 26, respectively. Also, the judgment circuit 20
The output of A is connected to a soundness determination circuit 22B, and the determination circuit 20B
Is connected to the soundness circuit 22A, and the output of the maintenance mode signal generator 14A is connected to the determination circuit 20B.

The simulation signal generator 26 has various operation switches, and is configured to generate a simulation signal in place of a command signal transmitted from the transmission lines 10 and 12 to each controller by operating a start switch. Further, when a mode designating switch for designating the maintenance mode is operated, in response to this operation, a signal for designating the maintenance mode is superimposed on the simulation signal and output to the controller C10. The maintenance mode signal generators 14A and 14B are configured as maintenance mode designation signal generating means for monitoring the state of the simulation signal and generating a maintenance mode designation signal when a signal for designating the maintenance mode is superimposed on the simulation signal. ing.

The soundness determination circuits 16A and 16B respectively provide soundness of input signals from the transmission lines 10 and 12, for example, the number of bits of digital data,
The presence or absence of an input signal is determined, and the determination result is determined by a determination circuit 20.
A, 20B, and the digital signals from the transmission lines 10, 12 are transmitted to the signal changeover switches 18A, 18B. The signal changeover switches 18A and 18B are simulated signal generators 26.
From the simulation signal from the soundness determination circuits 16A and 16B, and select and output one of the command signal and the simulation signal in accordance with the selection command from the determination circuits 20A and 20B. Have been. That is, the command signals from the soundness determination circuits 16A and 16B are selected when the mode is not the maintenance mode, and the simulation signal from the simulation signal generator 26 is selected during the maintenance mode. It should be noted that for the controller C11, only when the simulation signal generator 26 is connected to the terminal 28, the signal changeover switch 18
A simulation signal is input to B.

The judgment circuits 20A and 20B instruct the signal changeover switches 18A and 18B to select a command signal from the transmission lines 10 and 12 except when the maintenance mode signal is input, and input the simulation signal to the signal changeover switch 18A when the maintenance mode signal is input. , 18B, and a determination means for selecting and outputting a normal signal from the signals from the signal changeover switches 18A, 18B and the signals from the soundness determination circuits 22A, 22B. It has become. That is, the determination circuits 20A and 20B control the switching of the switches 18A and 18B, determine the signal of the own system and the signal of the other system, select the signal of the own system when both are normal, and determine whether the signal of the own system is present. When an abnormality occurs, a signal of another system is selected, and the selected signal is output to the control circuits 24A and 24B. The control circuits 24A and 24B each have control logic for controlling each control target, and are configured as control means for controlling each control target according to the control logic.

Next, the operation of the system in this embodiment will be described with reference to FIG.

First, each of the controllers C10 and C11 monitors whether or not a maintenance mode signal has been generated, and when the maintenance mode is not designated by the simulation signal generator 26 (step 10).
0), input the judgment results from the soundness judgment circuits 16A and 16B,
When the state of the input signal from the transmission lines 10 and 12 is normal (step 102), the controller C10 executes the control logic according to the signal from the transmission line 10, and the controller C11 executes the control logic according to the signal from the transmission line 12. (Step 104).

In the process of performing such processing, when the signal state of the own system becomes abnormal, it is determined whether the signal of the other system is normal based on the determination results of the soundness determination circuits 22A and 22B (step 108). At this time, when the signal of the other system is normal, the controller C10 determines that the transmission line 10 is faulty, selects the signal from the soundness determination circuit 22A, and executes the control logic according to this signal. When the transmission line 12 fails, the controller C11 selects a signal from the soundness determination circuit 22B and executes the control logic according to the signal. If the signal of the other system also becomes abnormal in step 108, abnormal processing is executed, and the processing in this routine is stopped (step 114).

Next, when an operation for designating the maintenance mode is performed, a signal for designating the maintenance mode is superimposed on the simulation signal generated from the simulation signal generator 16.
As a result, a maintenance mode signal is output from the maintenance mode signal generator 14A, and when the determination circuits 20A and 20B determine that the maintenance mode is set (step 100), a command for selecting a simulation signal is issued to the determination circuit 20A.
Is output to the signal changeover switch 18A. Thereafter, it is determined whether or not a simulation signal has been input to the determination circuit 20A (step 106). If no simulation signal has been input, the process proceeds to step 114. Even when no simulation signal is input, if the simulation signal generator 26 is connected to the terminal 28, the process proceeds to step 108,
The process proceeds to step 112 or 114 according to the determination result of step 108.

When the simulation signal is input to the determination circuit 20A, the simulation signal is output to the control circuit 24A, and the control logic is executed according to the simulation signal (step 110). At this time, the simulation signal from the signal changeover switch 18B is not input to the determination circuit 20B, but the maintenance mode signal from the maintenance mode signal generator 14A is input to the determination circuit 20B. The output signal of the circuit 20A is captured, and this signal is output to the control circuit 24B. Thus, the control circuit 24B executes the control logic simultaneously with the control circuit 24A according to the simulation signal.

In the above embodiment, the case where the simulation signal is input only to the controller C10 has been described.
It is also possible to input a simulation signal to each of C11,
In this case, the controllers C10 and C11 can be constituted by the same one and the maintenance mode signal generator can be used.
The transmission of the signal from 14A to the determination circuit 20B becomes unnecessary.

Further, when shifting from the maintenance mode to the real mode, if the setting process for setting the maintenance mode is initialized to zero, the shift to the real mode can be reliably performed.

〔The invention's effect〕

As described above, according to the present invention, the control logics of a plurality of controllers can be simultaneously advanced according to the simulation signal in the maintenance mode, so that the maintenance of the plurality of controllers can be efficiently executed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
It is a flowchart for demonstrating the effect | action of the system shown in a figure. 10, 12… Multiple transmission line, 14A, 14B… Maintenance mode signal generator, 16A, 16B, 22A, 22B… Soundness judgment circuit, 18A, 18B… Signal changeover switch, 20A, 20B… Judgment Circuit, 24A, 24B ... Control circuit, 26 ... Simulated signal generator.

Claims (3)

(57) [Claims] 1. A simulated signal generator for generating a simulated signal, and a plurality of controllers connected to a signal transmission line, wherein one of the controllers outputs a maintenance mode specifying signal in response to a command. When,
A first selection unit that receives a command signal from the signal transmission path and the simulation signal, selects and outputs a signal according to a selection command among these signals, and selects a simulation signal by inputting a maintenance mode designation signal. In other cases, there are provided first selection instruction means for instructing the first selection means to select an instruction signal from the signal transmission path, and first control means for controlling a control target by an output signal of the first selection means. The other controller receives the command signal from the signal transmission path and the output signal of the first selecting means, and selects and outputs a signal according to the selection command among these signals; The selection of the signal from the first selection means is input to the second selection means by the input of the maintenance mode designating signal from the controller, and the selection of the command signal from the signal transmission path to the second selection means otherwise. Digital controller system comprising a second control means for controlling the controlled object and a second selection command means, the output signal of the second selection means. A simulated signal generator for generating a simulated signal; and a plurality of controllers connected to a signal transmission line, wherein each controller outputs a maintenance mode specifying signal in response to a command. Selection means for receiving a command signal from the signal transmission path and the simulation signal, selecting and outputting a signal in accordance with the selection command among these signals, and selecting the simulation signal by inputting the maintenance mode designation signal. In other cases, the digital controller system includes a selection commanding means for instructing the selection means to select a command signal from the signal transmission path, and a control means for controlling a control target by an output signal of the selection means. 3. A simulated signal generator for generating a simulated signal, and a plurality of controllers connected to a signal transmission line, wherein each controller outputs a maintenance mode specifying signal in response to a command. Selection means for receiving a command signal from the signal transmission path and the simulation signal, selecting and outputting a signal in accordance with the selection command among these signals, and selecting the simulation signal by inputting the maintenance mode designation signal. Otherwise, selection command means for instructing the selection means to select a command signal from the signal transmission path, an output signal of the selection means of the own system controller, and an output signal of the selection means of the other system controller are received. A digital signal comprising: a judging means for outputting a normal signal among these signals; and a control means for controlling an object to be controlled by an output signal of the judging means. Controller system.