JPS6336560B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a process quantity monitoring apparatus, and particularly to a process quantity monitoring apparatus suitable for monitoring the process quantity of a plant using an electronic computer.

Generally, in order to smoothly operate a large-scale plant such as a power generation plant in which a large number of devices are organically connected, it is necessary to monitor the process amount of each part of the plant using an electronic computer.

For this reason, each process amount in the plant is loaded into a computer, and it is determined whether or not each is within a predetermined alarm setting range.If the process amount deviates from the set range, the process amount is displayed and a buzzer sounds. We are trying to inform the operators about this.

However, some of the process quantities monitored by computers in this way may remain within the set range even if they deviate from the set range, or return to within the set range after a while. There are some things. Moreover, deviation from this set range does not immediately have a negative effect on the plant, and moreover, it often occurs.

In this case, if the operator is free, the buzzer will sound to monitor the process quantity display instrument and take appropriate action; In some cases, the user simply confirms this, turns off the buzzer, postpones further processing, and continues with the previous task.

However, in conventional process quantity monitoring devices of this type, the processing shown in Figure 1 is performed in a computer, and once a warning output is issued for one process quantity, it is issued again for the same process quantity. The same alarm output was never issued.

For this reason, in the above-mentioned conventional device, the operator may forget that the alarm has been output after confirmation, and as a result, there is a risk that an unexpected situation may occur. On top of that,
Since the changed state of the process amount after it deviates from the set range is not displayed at all, the subsequent progress cannot be seen and efficient monitoring cannot be performed.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a process amount monitoring device that can grasp changes in the state of a process amount and perform efficient monitoring even after the device deviates from a set range, while eliminating the above-mentioned conventional drawbacks.

In order to achieve this objective, the present invention further provides a plurality of alarm set values outside the set range, and outputs an alarm each time these alarm set values are increased or decreased to call the operator's attention again, and to It is characterized by displaying the degree of alarm so that operators can grasp changes in the status of process quantities.

Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 2 is a block diagram of a process amount monitoring device showing an embodiment of the present invention, in which 1 is a plant, 2 is a process input device, 3 is a computer, and 4 is an alarm output device.

As shown in the functional block diagram of FIG. 3, the electronic computer 3 includes a limit value comparison section 31, a limit value generation section 32, a level comparison section 33 that compares the previous level and the current level, and a limit value comparison section 33 that compares the previous level with the current level. It is composed of a level storage section 34 for storing information. As shown in FIG. 4, this limit value generation unit 32 includes an upper limit value L ₁ of the setting range, a plurality of second limit values L ₂ to _{L o} provided in a range exceeding the upper limit value, and furthermore, as shown in FIG. A lower limit value of an unindicated setting range and a plurality of second limit values provided in a range below the lower limit value are stored,
It is configured to be output to the limit value comparison section 31.

Further, the alarm output device 4 may be configured using an annunciator type display lamp and a buzzer, but in the case of this embodiment, it is configured using a CRT display device and a buzzer.

The process amount monitoring device of this embodiment is configured as described above, and its operation is performed as shown in the flowchart of FIG.

That is, each process amount of the plant 1 is sequentially read into the computer 3 via the process input device 2 (STEP 1).

Now, suppose one process quantity is curve A in Figure 4.
Assume that the time has changed as shown in .
Incidentally, S ₁ , S ₂ , S ₃ . . . on the horizontal axis (time axis) of the figure indicate the timing at which the electronic computer 3 scans the process amount.

Then, each process amount a read at each scanning timing S ₁ , S ₂ , S ₃ . . .
1, and is then sequentially compared with the upper limit value L ₁ and the second limit values L ₂ to _Lo output from the limit value generating section 32 (STEP 2).

As a result, the limit value comparison section 31 finds L _j such that L _j a<L _j +1 (j=1, 2...n) (1), and the level signal b is sent to the level comparison section 33 and the level storage. It is output to the section 34 (STEP 3).

The level comparison section 33 compares the currently input level signal b with the previously input level signal e output from the level storage section 34 (STEP 4), and if they are different, an alarm output command signal d is output. (STEP 5)

On the other hand, the level signal b input this time is newly stored in the level storage section 34 in place of the previous level signal c.

Such processing is performed inside the computer 3, and the alarm output command signal d is output at points A ₁ , A ₂ , A ₃ , A _{4 .} . . shown in FIG. 4.

At this time, the computer 3 outputs an alarm message such as the process amount a and the limit value L _j at that time to the alarm output device 4 via a function block (not shown).

As a result, the alarm message is displayed on the CRT display device of the alarm output device 4, and
The buzzer sounds. Furthermore, if the alarm message is not the first one, the entire message or a portion thereof is flickered to distinguish it from alarm messages that have been output before.

The operator learns of the alarm from the buzzer, learns the process amount that caused the alarm from the flickering message, and presses the confirmation button to stop the flicker and the buzzer.

In this way, even after the process amount a exceeds the upper limit of the set range, a command is issued to the alarm output device 4 every time a level change occurs. At this time, the CRT display device of the alarm output device 4 also displays whether the vehicle is moving away from or approaching the set range.

As a result, even if the operator is performing other tasks, the buzzer sounds to alert the operator.
At that time, by looking at the CRT display device, it becomes possible to grasp the current state of the process amount.

It goes without saying that the operation in the computer 3 described above is performed in the same manner for the lower limit value and the second lower limit value.

As described above, according to the present invention, even if each process amount in a plant deviates from the alarm setting range,
Whenever there is a change exceeding the plurality of second limit values, a warning is issued to the operator, so that the operator can accurately grasp the state of change in the process amount. In addition, since it is possible to judge the importance of the alarm at this time, it is also possible to determine the priority of processing when multiple alarms occur, allowing the plant to operate even more smoothly. You will be able to do this.

[Brief explanation of the drawing]

FIG. 1 is a flowchart for explaining the operation of a conventional process amount monitoring device, FIG. 2 is a block diagram of a process amount monitoring device showing an embodiment of the present invention, and FIG. 3 is a diagram showing the internal structure of the computer. FIG. 4 is a diagram of the functional block configuration, FIG. 4 is a time lapse diagram of the process amount to explain its operation, and FIG. 5 is a flowchart to explain its operation. DESCRIPTION OF SYMBOLS 1...Plant, 2...Process input device, 3...Electronic computer, 4...Alarm output device, 31...Limit value comparison section, 32...Limit value generation section, 33...Level comparison section,
34...Level storage section.

Claims (1)

[Claims] 1. In a process quantity monitoring device that issues an alarm from an alarm output device when each process quantity in the plant deviates from each alarm setting range, a limit value generating section that generates a plurality of second limit values; sequentially comparing each input process quantity with each limit value generated from the limit value generating section;
A limit value comparison unit that determines the level between the limit values at which the process amount falls; a level storage unit that stores the level output from the limit value comparison unit; and the previous level output from the level storage unit and the above limit. It is equipped with a level comparison section that compares the current level output from the value comparison section and outputs an alarm command when there is a difference, and issues an alarm from the alarm output device each time each process quantity goes up or down each of the above limit values, and starts operation. A process quantity monitoring device that is characterized by reminding personnel of the alarm and notifying the degree of alarm.