JPS61267801A - Plant control system - Google Patents

Abstract

PURPOSE:To attain the even operation among plural motors by using an operating state deciding means to operate these motors in the order of smaller working time and then to stop them in the order of larger working time respectively. CONSTITUTION:The motors 4 are started and stopped by the operating command value 1 given from a host computer, etc. An operating state deciding means 6 is added together with a data table 9 containing the prescribed contents. Thus the working time is replaced for each motor 4 according to the operating state of the motor 4 to be controlled. At the same time, the trouble information is produced for replacement of the table 9. Furthermore a maintenance information producing means 7 is provided together with a start/stop control means 8. The means 7 delivers a maintenance message to a CRT 10 for the motor 4 whose working time reaches the working time set previously to the table 9. Then the means 6 adds the maintenance information to the replaced data. The means 8 decodes the stoppage of the motor 4 for control and stores the corresponding data in the table 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plant control system that controls the number of controlled devices in a plant that includes a plurality of controlled devices, such as electric motors.

[Conventional technology]

Figure 3 shows the components of a conventional one-runt control system.
In the figure, (1) is the operation command value input by the host meter w:m or the operator, and (2) is the input signal from the electric motor (4), and the output from the central processing unit (8) is applied to each electric motor. (4) An interface that outputs to (5
) is a data table that defines the order of operation and stop of the electric motor (4).

The operation of the above configuration will be explained according to the flowchart of FIG. 4. First, in step 840, an operation command value from an operator or a host computer is input. Then, in step 841, the current operating state is input.

After that, in step 842, it is determined whether the operation command value is greater than the current operation amount, and if it is, in step 843, a start instruction for the motors is outputted to the stopped motors in the order of the operation order table.

On the other hand, if the number is low, in step 844, the motors in operation are ordered 'fIL motion i' in the order of the stop order table.
Outputs a stop command to

[Problem that the invention seeks to solve]

Since the conventional plant control system is configured as described above, it is only possible to operate or stop the electric motors (4) in a preset order, and the problem is that the operation is too concentrated on some electric motors. There was a point.

It is an object of the present invention to provide a plant control system that can eliminate the above-mentioned problems and that can operate the electric ah machine evenly and predict the maintenance timing of the electric ah machine.

[Means for solving problems]

The plant control system according to the present invention includes an operating status determination unit that integrates operating time based on the operating status of an electric motor as a controlled device and updates a data table in accordance with a failure signal, and an operation status determination unit that updates maintenance information of the electric motor according to the result. A maintenance information creation means for outputting and a running/stopping control means for outputting operation commands in ascending order and stop commands in descending order with respect to the operating time of each electric motor are provided.

[Effect]

The plant control system according to the present invention measures the operating time of each electric motor as a controlled device, and a host computer starts the motors in the order of shortest operating time in response to the operating amount commanded by the operator. The motors can be stopped in descending order of frequency, and when the operating time reaches a preset maintenance time, maintenance information can be output and the operation of the motor can be stopped.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral (6) denotes a driving condition determining means, and the driving condition determining means (6) inputs a data table (9) with predetermined contents to determine the driving condition of the controlled electric motor (4). As a result, the operating time is updated for each motor (4), failure information is created, and the data table (9) is updated. (7 indicates a maintenance information creation means, (8) indicates an operation/stop control means, and in the maintenance information creation means (7), the electric motor whose operation time has reached the operation time set in advance in the data table (12) For (4), CRTα
A maintenance message is output to Q, and maintenance information is added to the data updated by the driving status determining means (6).

Based on this data, the operation/stop control means (8) receives the operation command value (
1) determines which electric motor (4) to start and which electric motor (4) to stop, controls each electric motor (4) to run or stop, and stores the data in a data table (9). do.

That is, the flowchart for executing the above control is
As shown in the figure. It is assumed that the control calculation according to the present invention is executed once at a fixed time. First, in step 821, data of data table (9) is input, and in step 822,
Input the operating status and operating command value of each electric motor (4). In step 823, the operating time in the data table (9) corresponding to the electric motor (4) in operation is increased by the execution period of the control calculation. Also, σ failure information is set for those that are in failure. Next, in step 824, it is checked whether the operating time of any motor (4) has reached the maintenance time set in the data table (9). Here, in step S25, maintenance information is output to the data table (9) and CRT (10>) for the electric motor (4) that has reached the maintenance time.Furthermore, the operation command value input in step 822 is applied to the electric motor (4) that has reached the maintenance time. (4) is increased.Next, in step S26, it is checked whether the operating state of the electric motor (4) which is in the maintenance state in the data table (9) is maintenance complete.Here, For those for which maintenance has been completed, all maintenance information is cleared in step s27, and the operating hours are initialized.

In step 828, a check is made to see if the operation command value is greater than the current number of vehicles in operation.
The motors are activated in the order of shortest operating time. On the other hand, in step 830, it is checked whether the operation command value is less than the current number of operating motors, and if it is, in step 831, the motors in operation are stopped in order of the longest operating time.

Finally, in step 332, the data is output to the data table (9).

In addition, in the above embodiment, the case where the controlled device is an electric motor has been explained, but if other control measures for static elimination that control the plant can be handled as number control, any control device may be used, and the same method as in the above embodiment may be used. be effective. Further, the operating status determining means (6), maintenance information creating means (γ), and operation/stopping control means (8) can be implemented in a computer.

〔Effect of the invention〕

As described above, according to the present invention, the order table for stopping the operation of controlled devices is automatically changed according to the operating time of each controlled device, so that the controlled devices used can be operated evenly. Gade.

This also has the effect of enabling highly efficient maintenance.

[Brief explanation of drawings]

Fig. 1 is an overall system configuration diagram according to an embodiment of the present invention, Fig. 2 is a flowchart for explaining the operation of the system shown in Fig. 1, and Fig. 3 is a conventional plant? ll11
1! FIG. 4 is a system configuration diagram showing the +11 system, and is a flowchart for explaining the operation of the system shown in FIG. In the figure, (1) is the operation command value from the host computer or operator, (4) is t; fth iso as the controlled object, (6) is the operation status determination means, (γ) is the maintenance information creation means, (8) is a driving status determination means, (9) is a data table, and α0) is a CRT as a maintenance information display means.

Claims (5)

[Claims] (1) In a plant control system equipped with a plurality of controlled devices, an operating status determination means that updates information in a data table in response to operation, stop, and failure signals from controlled devices; The present invention is characterized by comprising a maintenance information creation means for outputting maintenance and failure status of controlled equipment, and an operation/stop control means for controlling operation/stopping of each controlled equipment based on information in a data table in response to an operation stop request. plant control system. (2) The above-mentioned operating status determination means updates the operating time in the corresponding data table according to the operating status of the controlled equipment, and outputs failure information to the corresponding item in the data table in response to the failure signal. A plant control system according to claim 1. (3) The maintenance information creation means outputs a maintenance/failure message using the data table updated by the operation status determination means, as claimed in claim 1 or 2.
The plant control system described in Section. (4) The operation/stop control means determines the order of operation/stop of the controlled devices from the data table and the operation command value, and instructs each controlled device to start/stop in accordance with that order. A plant control system according to any one of claims 1 to 3, which outputs. (5) The plant control system according to any one of claims 1 to 4, wherein the operation information determination means, maintenance information creation means, and operation/stop control means are realized by a computer.