JPH06309002A - Plant controller - Google Patents

Abstract

PURPOSE:To lighten the labor load on an operator by calling operation state data right before a temporary stop which is stored in a temporary stop state holding means, putting the plant back to the corresponding state right before the temporary stop, and automatically restarting the operation of the plant when a restart command for the operation is inputted. CONSTITUTION:Temporary stop conditions in a stage of operation corresponding to the operation state when a temporary stop command is inputted are found, and a temporary stop command meeting the conditions is generated and outputted to the side of the plant P through an output control part 6 to stop the plant temporarily. In this temporary stop state, an abnormal situation is reset and the restart command is inputted through an input control part 1. In response to this input, a restart operation part 5 calls the operation state data right before the temporary stop which is held in the temporary stop state holding part 3. The restart operation command for placing the plant in the operation state is generated and the plant P is put back to the operation state right before the temporary stop through the output control part 6, thereby restarting the operation of the plant.

Description

Detailed Description of the Invention

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant control apparatus which, when a temporary stop is carried out at each operation stage of a plant, returns to the operating state immediately before the temporary stop and automatically restarts the operation.

[0003]

2. Description of the Related Art Conventionally, in a large-scale plant such as a beer manufacturing plant, there are various manufacturing processes, and a plurality of sequence operations are performed during each manufacturing process.

In such a large-scale plant, when an abnormality occurs in a certain sequence of a certain process and the operation is temporarily stopped, the pump is usually automatically stopped by a fail-safe function so as to be on the safe side, Although the valve is opened and closed appropriately to transit to the temporary stop state, if the next time an abnormality is avoided and the operation is restarted, the state where the sequence during the operation in which the temporary stop was performed ends in the past. Until then, the operator had to perform a manual operation and then switch to automatic operation at the beginning of the next new sequence.

[0005]

As described above, in the conventional plant control device, when the process is temporarily stopped in the middle of a certain sequence of steps, the operation is restarted until the end of the sequence. It is necessary to perform complicated restarting operations because the operation cannot be restarted unless the operation is switched from the beginning of a new sequence to automatic operation until the step There was a problem that put a large burden.

The present invention has been made in view of the above conventional problems, and even if the operation is temporarily stopped in the middle of an arbitrary sequence operation of an arbitrary process, the operation state immediately before the temporary stop is automatically changed. An object of the present invention is to provide a plant control device that can be restarted and that can reduce the labor burden on operators.

[Constitution of Invention]

[0008]

A plant control apparatus according to the present invention comprises means for inputting operating state data of a plant, temporary stop condition storage means for storing temporary stop conditions at each of a plurality of operating stages of the plant, and temporary stop condition storage means. In response to a stop command, a temporary stop state holding means for storing the operating state data of the plant at the time of inputting the command, and the operating stage of the plant at the time of inputting the temporary stop command are recognized, and from the temporary stop condition storage means. In response to a temporary stop condition of the corresponding driving stage and performing the corresponding temporary stop operation, in response to a restart command, the operating state data immediately before the temporary stop stored in the temporary stop state holding means is called. And a resuming operation means for resuming the operation of the plant by returning to the operation state just before the temporary stop.

[0009]

In the plant control device of the present invention, the temporary stop condition storage means stores the temporary stop condition at each of the plurality of operation stages of the plant. If there is a temporary stop command, the operating state data of the plant at the time of inputting the command is stored by the temporary stop state holding means. At the same time, the temporary stop operating means recognizes the operating stage of the plant at the time of inputting the temporary stop command, calls the temporary stop condition of the corresponding operating stage from the temporary stop condition storing means, and performs the corresponding temporary stop. Do the operation.

When an operation restart command is input after the temporary stop operation, the restart operation means retrieves the operating status data immediately before the temporary stop stored by the temporary stop status holding means and the operation immediately before the corresponding temporary stop. Return to the state and automatically restart the plant operation.

In this way, even if the plant is temporarily stopped at any of a plurality of operating stages, the operation can be automatically restarted from the state immediately before the temporary stop by the restart operation means.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, in which an input control unit 1 for controlling input of an operating state signal of a plant P, detection signals of various sensors, and the like, and a plurality of product manufacturing processes of the plant P. A temporary stop condition storage unit 2 that stores a temporary stop condition required for a temporary stop at each intermediate stage, and a temporary stop command that is input through the input control unit 1 are also input through the input control unit 1. Suspended state holding unit 3 for temporarily holding the coming operating state
It has and.

Further, when a temporary stop command is input, it is judged whether the operating state at the time of inputting the command belongs to which sequence of which process among the plurality of processes of the plant P belongs. A temporary stop operation unit 4 that calls a temporary stop condition for the operation stage from the temporary stop condition storage unit 2 and generates a temporary stop operation command corresponding to the condition, and a temporary stop state holding unit when a restart command is input. And a restart operation unit 5 that generates an operation command that calls the operation state immediately before the temporary stop of No. 3 and that is in the operation state, and an output control unit 6 that outputs the operation instruction to the plant P. Is equipped with.

Next, the operation of the plant control device having the above configuration will be described.

When an abnormality occurs at any stage of the operation of the plant and a temporary stop command is given to the input control unit 1 from the plant side (step S1 in FIG. 2), the temporary stop state holding unit 3 causes the input control unit to operate. The operation state data input via 1 is held (step S2). Further, the temporary stop operation unit 4 compares the operating state data held in the temporary stop state holding unit 3 with the temporary stop condition data stored in the temporary stop condition storage unit 2, and a temporary stop command is input. Find a temporary stop condition at the operating stage corresponding to the operating state, generate a temporary stop operation command according to this temporary stop condition, and output it to the plant P side via the output control unit 6 to set the plant P It is temporarily stopped in a state according to the above-mentioned temporary stop condition (steps S3 and S4).

In this temporary stop state, if the abnormal situation is released, a restart command is input through the input control unit 1, and the restart operation unit 5 causes the temporary stop state holding unit 3 to operate by inputting the restart command. The operation state data immediately before the suspension is recalled, the restart operation command for generating this operation state is generated, and output to the plant P through the output control unit 6 to bring the plant P to the operation state immediately before the suspension. The operation is resumed and the operation is restarted (steps S5 and S6).

In this way, when a temporary suspension of the plant occurs in the middle of any one of the plurality of processes, it is possible to automatically restart the operation by returning to the operating state immediately before the temporary suspension. I am doing so.

A more detailed operation of the above plant controller will be described below.

Now, assuming that the plant control apparatus of this embodiment is used for controlling a beer manufacturing plant, FIG.
Is a diagram showing a transfer process of transferring liquid from one selected delivery tank 11 to another selected reception tank 12, and a pipe 13 connecting the two tanks 11 and 12 with water. The valve 14, the payout tank bottom valve 15, the pump 16, the receiving tank bottom valve 17, and the blow valve 18 are devices related to the liquid transfer step.

In the actual transfer process, there are a plurality of sequences 1 to 5 as shown in Table 1 below,

[0022]

[Table 1]

As shown in Table 2 below,

[0024]

[Table 2]

In the water passage of sequence 1, the water valve 14 and the blow valve 18 are opened, both tank bottom valves 15 and 17 are closed, the pump is started, and water is passed through the entire pipe 13 and discharged from the blow valve 18. Then, the inside of the pipe 13 is cleaned.

In the subsequent draining of sequence 2, the water valve 14
Is closed and the discharge tank bottom valve 15 is opened, the liquid in the discharge tank 11 is caused to flow out to the pipe 13, and the water remaining in the pipe is pushed out from the blow valve 18, and the pipe 1
Fill 3 with liquid.

In the subsequent transfer of the sequence 3, the liquid transfer work is started in earnest. For that purpose, the blow valve 18 is closed, the receiving tank bottom valve 17 is opened, and the bottom valve from the dispensing tank 11 is opened. The liquid flowing out into the pipe 13 through the pump 15 is sent to the receiving tank 12 side by the pump 16 through the bottom valve 17, and the transfer is executed.

When the transfer of the predetermined amount of liquid is completed, subsequently, in order to send all the liquid remaining in the pipe 13 to the receiving tank 12 side, the water pushing in sequence 4 is performed, and for that reason, the dispensing is performed. The bottom valve 15 of the tank 11 is closed to stop the flow of liquid, and the water valve 14 is opened to open the pipe 1
Water is introduced into 3 and all the liquid remaining in the pipe 13 is sent to the receiving tank 12 through the bottom valve 17.

When this water pushing is completed, next,
In order to clean the inside of the pipe by the blow of sequence 5, the receiving tank bottom valve 17 is closed, the blow valve 18 is opened, and water is passed through the pipe 13 for an appropriate time.

Thus, one liquid transfer step is completed by the series of sequences 1 to 5.

Therefore, now, in this transfer process, if an abnormality occurs during execution of any one of the sequences, how to temporarily stop and restart automatically will be described.

The following Table 3 is a temporary stop condition table for clarifying under what conditions the temporary stop occurs when the temporary stop occurs in any of the operation stages of the respective sequences 1-5.

[0033]

[Table 3]

In the water passage stage of sequence 1, in response to the input of the temporary stop command, the pump 16 is stopped, both the water valve 14 and the blow valve 18 which have been open until then are closed, and the timer count is also stopped. As a result, the pipe 13 is filled with water for a temporary stop during water passage.

Therefore, when a restart command is given from this temporary stop state, the pump 16 is started in the operating state immediately before the temporary stop held by the temporary stop state holding section 3,
The restart operation unit 5 opens the water valve 14 and the blow valve 18, and restarts the timer count, and restarts the automatic operation from the middle stage of water passage.

Similarly, when a temporary stop command is input during the draining operation step of sequence 2, the pump 16 is stopped in accordance with the temporary stop condition shown in Table 3, and the discharge tank bottom valve 15 that has been open until then is replaced. The blow valve 18 is closed together, the timer count is stopped, and the movement of the liquid and water in the pipe 13 is stopped.

When the restart command is input, the pump is in the operating state immediately before the suspension held by the suspension state holding unit 3, the pump is opened, the discharge tank bottom valve 15 and the blow valve 18 are opened, and the timer is started. The restart operation unit 5 restarts the counting, and restarts the automatic operation from the middle of the draining operation.

Similarly, for the transfer operation, the water pushing operation, and the blow operation, even if a temporary stop occurs in the middle of each of the operation steps, the temporary stop operation unit 4 operates in the corresponding operation step. When the temporary stop condition is found, the plant operation is temporarily stopped in a state where the temporary stop condition is met, and when a restart command is input, the restart operation unit 5 reproduces the operating condition immediately before the temporary stop. The automatic operation is restarted.

It should be noted that the present invention is not limited to the liquid transfer step of the above-mentioned embodiment, can be used in any of a plurality of steps, and is not limited to a beer manufacturing plant. Instead, it can be widely applied to plant operation control.

[0040]

As described above, according to the present invention, even if a temporary stop occurs at various operating stages of the plant, the automatic operation is restarted from the operating state immediately before the temporary stop by the input of the restart command. When a temporary stop occurs as in the past, it is not necessary to operate the plant by manual operation until the beginning of the next sequence when restarting the operation thereafter, and the labor burden on the operator can be reduced. Also, the plant can be operated efficiently.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the above embodiment.

FIG. 3 is an explanatory diagram of a liquid transfer step for explaining the operation of the above embodiment.

[Explanation of symbols]

 1 Input Control Section 2 Suspended Condition Storage Section 3 Suspended State Holding Section 4 Suspended Operation Section 5 Restart Operation Section 6 Output Control Section P Plant 11 Discharge Tank 12 Receiving Tank 13 Piping 14 Water Valve 15 Discharge Tank Bottom Valve 16 Pump 17 Receiving tank bottom valve 18 Blow valve

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Yamamoto No. 1 Toshiba-cho, Fuchu-shi, Tokyo Toshiba Corporation Fuchu factory

Claims (1)

[Claims] 1. A means for inputting operating state data of a plant, a temporary stop condition storage means for storing temporary stop conditions at each of a plurality of operating stages of the plant, and a temporary stop command for inputting the temporary stop command. A temporary stop state holding means for storing the operating state data of the plant, recognizing the operating stage of the plant at the time of inputting the temporary stop command, and calling out the temporary stop condition of the corresponding operating stage from the temporary stop condition storing means. In response to the temporary stop operation means for performing the corresponding temporary stop operation and the restart command, the operating status data immediately before the temporary stop stored in the temporary stop status holding means is called to restore the operating status immediately before the corresponding temporary stop. A plant control device comprising a restart operation means for restarting the operation of the plant.