JP3323037B2 - Alarm setting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for monitoring a monitored process by comparing a monitored process amount with an alarm set value in a process instrumentation of various industries such as a power plant, petrochemical, steel, food, and papermaking. The present invention relates to an improvement in an alarm setting device used to generate an alarm output when an amount exceeds an alarm set value.

[0002]

2. Description of the Related Art In general, for example, in process instrumentation of various industries such as power plants, petrochemicals, steel, foods, and papermaking,
2. Description of the Related Art An alarm setting device for comparing a monitored process amount with an alarm set value and generating an alarm output when the monitored process amount exceeds the alarm set value has been widely used.

Conventionally, as this kind of alarm setting device, there is an analog type which comprises a comparator and a relay, and an intelligent digital type which adds various functions in addition to a microprocessor instead of this analog type function. There are things.

However, such a conventional alarm setting device has the following problems. (A) When various setting values are changed in a microprocessor-equipped type, an erroneous operation may cause an erroneous alarm to be output, which may greatly hinder plant operation. (B) Since an alarm is suddenly generated without notice, it is not possible to prepare for a response before the alarm is generated.

[0005]

As described above, in the conventional alarm setting device, when various setting values are changed, plant operation is hindered due to a setting error, or an alarm is generated due to sudden generation of an alarm. There was a problem that it was not possible to prepare for the response before it occurred.

A first object of the present invention is to make it possible to safely and reliably change various set values in an online state without inadvertently affecting plant operation even if a setting error occurs. It is to provide a simple alarm setting device.

It is a second object of the present invention to easily and intuitively grasp the margin of a monitored process amount with respect to an alarm set value until an alarm is generated, and to prepare for a response when an alarm is generated in advance. It is an object of the present invention to provide an alarm setting device capable of performing the above.

[0008]

In order to achieve the first object, an alarm setting device according to the first aspect of the present invention comprises an input means for inputting a monitored process amount, and an alarm setting value. Setting means for setting, comparing means for comparing the monitored process amount inputted by the input means with the alarm set value set by the setting means, and displaying the alarm occurrence status based on the comparison output value from the comparing means Alarm display means,
An alarm output unit that outputs an alarm occurrence state based on a comparison output value from the comparison unit; and an alarm output prohibition unit that temporarily fixes an alarm output from the alarm output unit to an alarm non-occurrence state. Consisting of

Therefore, in the alarm setting device according to the first aspect of the present invention, the alarm output from the alarm output means is temporarily and forcibly fixed to the alarm non-generating state.
Even if various setting values are changed incorrectly and a false alarm is issued, the setting is not affected, and only the display is incorrect. Since it is possible to know that the setting is incorrect, the alarm output prohibiting means is released after the setting value is correctly set again, whereby the setting value can be changed without hindering plant operation.

According to a second aspect of the present invention, there is provided an alarm setting device, comprising: input means for inputting a monitored process amount, setting means for setting an alarm set value, and a monitored process amount input by the input means. Comparing means for comparing the alarm set value set by the setting means, alarm display means for displaying an alarm occurrence status based on the comparison output value from the comparing means, and alarming based on the comparison output value from the comparing means. Alarm output means for outputting the occurrence status, alarm output inhibition means for temporarily forcibly fixing the alarm output from the alarm output means to an alarm non-occurrence state, and changing the set value only for the alarm display means. Setting value changing means for performing the processing as described above.

Further, the alarm setting device according to the invention according to claim 3 comprises an input means for inputting a monitored process amount, a setting means for setting an alarm set value, and a monitored process amount inputted by the input means. Comparing means for comparing the alarm set value set by the setting means, alarm display means for displaying an alarm occurrence status based on the comparison output value from the comparing means, and alarming based on the comparison output value from the comparing means. For a certain period after the setting value is changed, only the alarm display means performs processing based on the set value after the change, and the alarm output means performs processing based on the set value before the change. Setting value changing means for performing processing so as to perform the processing.

Therefore, in the alarm setting device according to the second and third aspects of the present invention, during a certain period after the change of the set value, the judgment and the output of the alarm are made according to the set value before the change. By performing processing and displaying the alarm according to the set value after the change, the display is set so that various setting values may be changed incorrectly and a false alarm may be output. ,
Since the output based on the erroneous setting state is not made for a certain period after the setting value is changed, the setting value is changed without any trouble to the plant operation by knowing that the setting is incorrect by the display within the certain period and correcting the setting. Can be realized.

On the other hand, in order to achieve the second object,
According to a fourth aspect of the present invention, there is provided an alarm setting device, comprising: input means for inputting a monitored process amount; setting means for setting an alarm set value; and a monitored process amount input by the input means. Comparing means for comparing the set alarm value with the set alarm value, alarm display means for displaying an alarm occurrence state based on the comparison output value from the comparison means, and outputting an alarm occurrence state based on the comparison output value from the comparison means. An alarm output means, and an alarm or display sound which changes in a cycle substantially proportional to the deviation when the alarm is not generated and the deviation between the monitored process amount and the alarm set value is a certain value or less. Alarm occurrence notifying means for notifying of occurrence.

Therefore, in the alarm setting device according to the present invention, when there is a situation immediately before an alarm is generated,
For example, by reading a display or sounding a sound that changes in a cycle that is approximately proportional to the deviation between the monitored process amount and the alarm set value, a warning is given, and the monitored process amount and the alarm set value are read and compared. It is possible to easily and intuitively grasp the margin before an alarm is generated with the blinking cycle of the display lamp or the cycle of the ringing sound without any special effort. (It is easy to appeal to intuition.) Therefore, it is possible to easily prepare for a response immediately before an alarm occurs.

On the other hand, in order to achieve the first and second objects, an alarm setting device according to a fifth aspect of the present invention comprises an input means for inputting a monitored process amount and an alarm setting value. Setting means, a comparing means for comparing the monitored process amount input by the input means with the alarm set value set by the setting means, and displaying an alarm occurrence state based on a comparison output value from the comparing means. Alarm display means;
An alarm output unit that outputs an alarm occurrence state based on a comparison output value from the comparison unit; an alarm output prohibition unit that temporarily forcibly fixes an alarm output from the alarm output unit to an alarm non-occurrence state; When no alarm is generated and the deviation between the monitored process amount and the alarm set value is less than a certain value, an alarm that gives an advance notice of the alarm generation by a display or a sound that changes in a cycle substantially proportional to the deviation. And means for notifying occurrence.

Therefore, in the alarm setting device according to the present invention, the alarm output from the alarm output means is temporarily and forcibly fixed to the alarm non-generating state.
Even if various setting values are changed incorrectly and a false alarm is issued, the setting is not affected, and only the display is incorrect. Since it is possible to know that the setting is incorrect, the alarm output prohibiting means is released after the setting value is correctly set again, whereby the setting value can be changed without hindering plant operation.

Further, in a situation immediately before the occurrence of an alarm,
For example, by reading a display or sounding a sound that changes in a cycle that is approximately proportional to the deviation between the monitored process amount and the alarm set value, a warning is given, and the monitored process amount and the alarm set value are read and compared. It is possible to easily and intuitively grasp the margin before an alarm is generated with the blinking cycle of the display lamp or the cycle of the ringing sound without any special effort. (It is easy to appeal to intuition.) Therefore, it is possible to easily prepare for a response immediately before an alarm occurs.

According to a sixth aspect of the present invention, there is provided an alarm setting device, comprising: input means for inputting a monitored process amount, setting means for setting an alarm set value, and a monitored process amount input by the input means. Comparing means for comparing the alarm set value set by the setting means, alarm display means for displaying an alarm occurrence status based on the comparison output value from the comparing means, and alarming based on the comparison output value from the comparing means. Alarm output means for outputting the occurrence status, set value changing means for performing processing so as to change the set value only for the alarm display means, the monitored process amount and the alarm set value when no alarm is generated If the deviation is less than or equal to a certain value, there is provided an alarm occurrence notifying means for notifying the occurrence of an alarm by a display or a sound that changes in a cycle substantially proportional to the deviation.

Further, the alarm setting device according to the invention according to claim 7 includes an input means for inputting a monitored process amount, a setting means for setting an alarm set value, and a monitoring process amount input by the input means. Comparing means for comparing the alarm set value set by the setting means, alarm display means for displaying an alarm occurrence status based on the comparison output value from the comparing means, and alarming based on the comparison output value from the comparing means. For a certain period after the setting value is changed, only the alarm display means performs processing based on the set value after the change, and the alarm output means performs processing based on the set value before the change. Setting value changing means for performing processing so as to perform processing in a state where no alarm is generated and when a deviation between the monitored process amount and the alarm setting value is equal to or less than a predetermined value, the deviation is substantially proportional to the deviation. By the display or ringing tone varies in a cycle comprising an alarm generation notification means for notification of alarm.

Therefore, in the alarm setting device according to the present invention, during a certain period after the set value is changed, the judgment and the output of the alarm are made according to the set value before the change. By performing processing and displaying the alarm according to the set value after the change, the display is set so that various setting values may be changed incorrectly and a false alarm may be output. ,
Since the output based on the erroneous setting state is not made for a certain period after the setting value is changed, the setting value is changed without any trouble to the plant operation by knowing that the setting is incorrect by the display within the certain period and correcting the setting. Can be realized.

Further, in a situation immediately before the occurrence of an alarm,
For example, by reading a display or sounding a sound that changes in a cycle that is approximately proportional to the deviation between the monitored process amount and the alarm set value, a warning is given, and the monitored process amount and the alarm set value are read and compared. It is possible to easily and intuitively grasp the margin before an alarm is generated with the blinking cycle of the display lamp or the cycle of the ringing sound without any special effort. (It is easy to appeal to intuition.) Therefore, it is possible to easily prepare for a response immediately before an alarm occurs.

The alarm output inhibiting means may be, for example, a normal manual switch, a momentary switch that automatically turns off when not pressed with a finger, or an off-state. It is preferable to use one having a structure in which the state is conspicuous.

[0023]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 is a block diagram showing a configuration example of an analog alarm setting device according to the present embodiment.

That is, as shown in FIG. 1, the analog alarm setting device of this embodiment has an input device 1 and a setting device 2
And a comparison amplifier 3 as a comparison means, an alarm display lamp driving circuit 4 and an alarm display lamp 5 as alarm display means.
And an output relay driving circuit 6 and an output relay 7 as alarm output means, and a manual switch 8 as an alarm output prohibiting means provided between an output side of the comparison amplifier 3 and an input side of the output relay driving circuit 6. It is composed of

Here, the input unit 1 inputs a monitored process signal. The setting device 2 sets an alarm set value. Further, the comparison amplifier 3 is connected to the monitored process signal input by the input device 1 and the setting device 2
Is compared with the alarm set value input by the user.

On the other hand, the alarm display lamp drive circuit 4 displays the alarm occurrence status on the alarm display lamp 5 based on the comparison output value from the comparison amplifier 3. The output relay drive circuit 6 outputs an alarm occurrence status to the output relay 7 based on the comparison output value from the comparison amplifier 3.

Further, the manual switch 8 is for temporarily fixing an alarm output, which is a contact output of the output relay 7, to a non-alarm state. Next, the operation of the analog alarm setting device of the present embodiment configured as described above will be described.

In FIG. 1, the monitored process signal is compared with the alarm set value by the comparison amplifier 3, and when the monitored process signal exceeds the alarm set value (in the upper limit alarm, the monitored process signal> alarm set value In the case of the lower limit alarm, when the monitored process signal <the alarm set value), the comparison amplifier 3 outputs an output (for example, high level) corresponding to the generation of the alarm,
The alarm display lamp 5 is turned on via the alarm display lamp drive circuit 4, and the output relay 7 is driven via the output relay drive circuit 6 via the manual switch 8 which is in the ON state, so that an alarm is generated.

As a result, as a whole, when the monitored process signal exceeds the alarm set value, the alarm output is generated externally. Similarly, when the monitored process signal does not exceed the alarm set value, no alarm output is generated externally and no display is made.

Now, let us consider a case where, for example, an alarm set value is changed in a normal state, that is, a state in which no alarm output is generated. In this case, first, the manual switch 8 is turned off. Thus, regardless of the output of the comparison amplifier 3, the output relay drive circuit 6 does not output an alarm occurrence state. After that, the alarm set value is changed. The contents of the change are assumed to be such that if the change is made normally, no alarm is generated with the current value of the monitored process signal (for example, when the monitored process signal is stable at 70%, It is assumed that the alarm set value is changed from 85% to 75%).

If the alarm set value is set to 65% due to an operation error during this change operation, the comparison amplifier 3 outputs an output corresponding to the generation of the alarm, and displays the alarm via the alarm display lamp driving circuit 4. The lamp 5 is turned on.

However, since the manual switch 5 is turned off, the output relay drive circuit 6 is not driven to generate an alarm output. Further, the operator notices an erroneous setting by watching the lighting of the alarm display lamp 7, and can correctly reset the alarm set value to 75%. Then, after confirming that the alarm display lamp 5 does not light, the manual switch 5 is returned to the ON state, and the alarm may be output when the alarm should be output.

As described above, the analog type alarm setting device of the present embodiment receives the input from the input device 1 for inputting the monitored process signal, the setting device 2 for setting the alarm set value, and the input device 1. A comparison amplifier for comparing the monitored process signal with an alarm set value input by the setting device; and an alarm display for displaying an alarm occurrence status on an alarm display lamp based on a comparison output value from the comparison amplifier. The lamp drive circuit 4, an output relay drive circuit 6 that outputs an alarm occurrence status to an output relay 7 based on a comparison output value from the comparison amplifier 3, and an alarm output as a contact output of the output relay 7 are temporarily stored. And a manual switch 8 that is forcibly fixed to a state in which no alarm is generated.

Accordingly, by temporarily forcibly fixing the alarm output from the alarm output means including the output relay drive circuit 6 and the output relay 7 to a state where no alarm is generated, it is possible to erroneously change various set values. Even if it is set so that a false alarm is issued, it is possible to know that the setting is incorrect only by displaying, without affecting the plant, that is, the setting that the alarm should be issued when the alarm should not be issued. Since the set value can be correctly set again and then the manual switch 8 serving as the alarm output prohibiting means is released, the set value can be changed without hindering plant operation.

Thus, even if a setting error is made, it is possible to confirm and correct without inadvertently affecting the plant operation. Therefore, it is possible to safely and reliably change various set values in the online state. Becomes possible.

The above effects are extremely practical and useful in actually operating a plant. (Second Embodiment) FIG. 2 is a block diagram showing a configuration example of a digital alarm setting device according to the present embodiment.

That is, as shown in FIG. 2, the digital alarm setting device according to the present embodiment comprises an input device 11, an amplifier 12, an A / D converter 13, a CPU 14, a ROM 1
5, an RAM 16, a timer 17, an output port 18 as an alarm output means, an output relay drive circuit 19, and an output relay 20, an operation section 21, an operation display interface 22, and a display section 23 as an alarm display means. It is composed of

That is, the A / D converter 13 is connected to the CPU 14, the ROM 15, the RAM 16, the timer 17, the output port 18, and the operation display interface 22 via a bus line. The output signal of the output port 18 is input to the output relay drive circuit 19, the output of the output relay drive circuit 19 is output to the output relay 20, and the contact output of the output relay 20 is used as the alarm output of the alarm setting device. Output to the outside. Further, the operation display interface 22
Is connected to the operation unit 21 and the display unit 23.

Here, the input unit 11 inputs a monitored process signal. The amplifier 12 amplifies the monitored process signal input from the input device 1.

Further, the A / D converter 13 includes an amplifier 12
Is converted into a digital signal. On the other hand, the RAM 16 stores alarm setting values, input data, and other processing data set by the operator from the operation unit 21 via the operation display interface 22.

The CPU 14 compares the monitored process signal from the A / D converter 13 with the alarm set value stored in the RAM 16 and operates the alarm generation status based on the comparison processing result. Display interface 22
An alarm display process to be displayed on the display unit 23 via the display unit.
Alarm output processing for outputting to the output relay 20 via the output relay drive circuit 19, a certain period (set by the timer 17) after the set value is changed by the operator from the operation unit 21 via the operation display interface 22 Is a process in which only the alarm display process performs a process based on the set value after the change, and the alarm output process executes a set value change process in which the process is performed based on the set value before the change. is there.

Further, the ROM 15 stores various processes executed by the CPU 14 as programs. Next, the operation of the digital alarm setting device of the present embodiment configured as described above will be described with reference to the flowchart shown in FIG.

In FIG. 2, the entire control is performed by the ROM 15
Is performed by the CPU 14 according to the program stored in the. The monitored process signal is amplified by the amplifier 12 at a certain period set by the timer 17, and then the A / A
The signal is converted into a digital signal by the D converter 13 and read into the CPU 14.

The digital value of the monitored process signal is
The alarm value is compared with the digital value of the alarm set value set by the operator by the operation unit 21 separately. As a result, if the monitored process signal exceeds the alarm set value, an output corresponding to the occurrence of the alarm is generated from the output port 18, and the output relay 20 is set to the alarm generation state via the output relay drive circuit 19. Therefore, an alarm is generated as the whole alarm setting device.

At this time, an alarm generation state is also displayed on the display unit 23 via the operation display interface 22. In the above, if the monitored process signal does not exceed the alarm set value, no alarm output is generated,
The display on the display unit 23 is not performed.

Now, let us consider a case where, for example, an alarm set value is changed in a normal state, that is, a state in which no alarm output is generated. This change is assumed to be such that if the alarm set value is changed normally, no alarm will be generated with the current monitored process signal value (for example, the monitored process signal becomes stable at 70%). It is assumed that the alarm set value is changed from 85% to 75% when the operation is performed.

The CPU 4 operates, for example, once a second, as shown in FIG.
It operates according to the flowchart shown in FIG. Note that the change processing itself is not shown in FIG. 3 and is separately processed.

If the alarm setting value is set to 65% due to an operation error during the change operation, the display of the alarm is displayed on the display unit 23 via the operation display interface 22. Since the value of the CNT counter is positive for three minutes (180 seconds) immediately after the change of the set value, as shown in the flowchart of FIG.
An output based on the set value used in the previous process, that is, an output based on a proven set value is generated via the output relay drive circuit 19 and the output relay 20.

Within the three minute grace period, the operator can confirm that the setting is erroneous and reset the correct setting value. Then, after three minutes of resetting due to this correction, an alarm output based on the new set value is generated.

As described above, the digital alarm setting device according to the present embodiment includes the input device 11 for inputting the monitored process signal, the amplifier 12 for amplifying the monitored process signal input by the input device 1, A / D converter 1 for converting a monitored process signal from amplifier 12 into a digital signal
3, an operation unit 21 for setting an alarm set value, and an operation unit 21
The RAM 16 stores alarm setting values, input data, and other processing data set by the operator via the operation display interface 22 from the A / D converter 13 according to a program stored in the ROM 15. A comparison process for comparing the process signal with the alarm set value stored in the RAM 16; an alarm display process for displaying an alarm occurrence status on the display unit 23 via the operation display interface 22 based on the comparison process result; An alarm output process for outputting an alarm occurrence status to an output relay 20 via an output port 18 and an output relay drive circuit 19 based on the processing result, and a setting value changed from an operation unit 21 by an operator via an operation display interface 22 After a certain period of time (set by the timer 17), only the alarm display processing changes. Performs processing based on the setting value after, in which the warning output processing is composed CPU14 Metropolitan executing the set value changing process of performing processing to perform processing based on the setting values before the change.

Therefore, during a certain period after the change of the set value, the judgment and the output of the alarm are performed according to the set value before the change, and the judgment and display of the alarm are performed according to the set value after the change. With such processing, even if various setting values are erroneously changed and a false alarm is set, an output based on the erroneous setting state is not performed for a certain period after the setting value is changed. Therefore, the setting value can be changed without any trouble in plant operation by knowing that the setting is erroneous by the display and correcting the setting to a correct one within the certain period.

In this way, even if a setting error is made, it is possible to confirm and correct without inadvertently affecting the plant operation. Therefore, it is possible to safely and reliably change various set values in the online state. Becomes possible.

The above effects are extremely practical and useful in actually operating the plant. (Third Embodiment) FIG. 4 is a block diagram showing a configuration example of a digital alarm setting device according to the present embodiment. The same elements as those in FIG.
Here, only different parts will be described.

That is, in the digital alarm setting device of this embodiment, as shown in FIG. 4, an alarm warning lamp 23A is provided in the display unit 23 in addition to FIG.

In addition, as an execution process in the CPU 14, when no alarm is generated and the deviation between the monitored process signal and the alarm set value is less than a certain value,
An alarm occurrence notice process for giving an notice of an alarm occurrence by a display by an alarm notice lamp 23A which changes at a cycle substantially proportional to this deviation is added.

Next, the operation of the digital alarm setting device of the present embodiment configured as described above will be described with reference to the flowchart shown in FIG. 5 and the data conversion graph shown in FIG.

The description of the same contents as those of the second embodiment will be omitted, and only the functions of the different parts will be described here. In FIG. 4, the CPU
14 operates once a second in accordance with the flowchart shown in FIG.

In other words, in the case of the upper limit alarm, the value of the monitored process signal is subtracted from the alarm set value. If the result (M) is a positive value and smaller than the value in the advance notice zone, FIG. Is controlled via the operation display interface 22 so that the warning notice lamp 23A in the display unit 23 blinks with the cycle of the value of f calculated according to the value of M from the graph shown in FIG.

When the value of M is negative, that is, when an alarm occurs,
If the value of M is larger than the value of the warning band, that is, if the margin is still large before the warning is generated, the warning warning lamp 23A
Is controlled not to light.

As described above, the digital alarm setting device according to the present embodiment is different from the digital alarm setting device according to the second embodiment in that an alarm notice lamp 23A is provided on the display unit 23 and the CPU 14 As a process, when the alarm is not generated and the deviation between the monitored process signal and the alarm set value is equal to or less than a certain value, the alarm is displayed by the alarm notice lamp 23A which changes in a cycle substantially proportional to this deviation. An alarm occurrence notice process for giving notice of occurrence is added.

Therefore, when the situation is immediately before the occurrence of the alarm, the occurrence of the alarm is notified by the display of the alarm notification lamp 23A which changes in a cycle substantially proportional to the deviation amount between the monitored process signal and the alarm set value. The warning notice lamp 23A does not need to read and compare the monitored process signal and the value of the alarm set value.
It is easy to intuitively grasp the margin before an alarm is generated by the flashing cycle of (It is easy to appeal to human intuition that the cycle is shortened when approaching, so it is easy to respond to the situation just before the alarm occurs Preparation can be facilitated.

As a result, it is possible to easily and intuitively grasp the margin before the alarm is generated by the warning notice lamp 23A before the alarm is generated. Can be prepared in advance.

The above effects are extremely practical and useful in actually operating the plant. The present invention is not limited to the above embodiments, but can be implemented in the following manner.

(A) In the first embodiment, as the manual switch 8, the momentary switch (finger press) is used so as to prevent the alarm from being interrupted when the alarm is generated. It is also useful to employ a switch having a structure in which the switch is automatically turned off if the switch is not turned on, or a switch having a structure in which the switch is in an off state is very noticeable.

(B) In the second embodiment, it is also useful to provide a display lamp for indicating the grace period after the change of the set value. (C) In the third embodiment, the warning notice lamp 2
3A may be a periodic change in luminance or color instead of blinking.

Further, instead of the display by the warning notice lamp 23A, a sound by a sounding means such as a buzzer is used.
You may make it change the switching cycle of a ringing sound ON / OFF, a pitch, a tone color, etc.

[0067]

As described above, according to the first aspect of the present invention, the input means for inputting the monitored process amount, the setting means for setting the alarm set value, and the input means input by the input means. Comparison means for comparing the monitoring process amount with the alarm set value set by the setting means; alarm display means for displaying an alarm occurrence state based on the comparison output value from the comparison means; and comparison output value from the comparison means Alarm output means for outputting an alarm generation status based on the alarm output, and alarm output prohibition means for forcibly fixing the alarm output from the alarm output means to a non-alarm generation state temporarily. Thus, it is possible to provide an alarm setting device that can safely and reliably change various set values in an online state without inadvertently affecting plant operation.

According to the second aspect of the present invention,
Input means for inputting the monitored process amount, setting means for setting the alarm set value, comparing means for comparing the monitored process amount input by the input means with the alarm set value set by the setting means, Alarm display means for displaying the alarm occurrence status based on the comparison output value from the comparison means, alarm output means for outputting the alarm occurrence status based on the comparison output value from the comparison means, and setting only for the alarm display means It is equipped with a setting value changing means that performs processing to change the value, so that even if a setting error occurs, it is possible to change various setting values online without inadvertently affecting the plant operation. An alarm setting device that can be performed safely and reliably can be provided.

Further, according to the invention corresponding to claim 3, input means for inputting the monitored process amount, setting means for setting the alarm set value, monitored process amount input by the input means, Means for comparing an alarm set value set by the means, alarm display means for displaying an alarm occurrence state based on the comparison output value from the comparison means, and alarm occurrence state based on the comparison output value from the comparison means. And the alarm output means for performing a process based on the set value after the change, and the alarm output means performs the process based on the set value before the change for a certain period after the set value is changed. And a set value change unit that performs processing to perform various processes so that even if a setting error occurs, it is safe to change various set values online without inadvertently affecting plant operation. And capable of reliably performing the alarm setting device can be provided.

On the other hand, according to the invention corresponding to claim 4,
Input means for inputting the monitored process amount, setting means for setting the alarm set value, comparing means for comparing the monitored process amount input by the input means with the alarm set value set by the setting means, Alarm display means for displaying an alarm occurrence status based on the comparison output value from the comparison means; alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means; And, when the deviation between the monitored process amount and the alarm set value is a certain value or less, an alarm generation notifying means for notifying the occurrence of an alarm by a display or a sound that changes in a cycle substantially proportional to the deviation is provided. As a result, it is possible to easily and intuitively grasp the margin of the monitored process amount with respect to the alarm set value before the alarm is generated, and to prepare in advance for the response when the alarm is generated. Setting device can be provided.

According to the invention corresponding to claim 5,
Input means for inputting the monitored process amount, setting means for setting the alarm set value, comparing means for comparing the monitored process amount input by the input means with the alarm set value set by the setting means, An alarm display means for displaying an alarm occurrence status based on the comparison output value from the comparison means; an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means; and an alarm output from the alarm output means. An alarm output prohibiting means for temporarily forcibly fixing an alarm non-occurrence state; and, when an alarm is not generated and a deviation between a monitored process amount and an alarm set value is a certain value or less, The system is provided with an alarm occurrence notifying means for notifying the occurrence of an alarm by a display or a ringing sound that changes at a cycle substantially proportional to the deviation. It is possible to safely and reliably change various set values online without any inconvenience, and to easily and intuitively grasp the margin of the monitored process amount to the alarm set value until an alarm occurs. In addition, it is possible to provide an alarm setting device capable of preparing for a response when an alarm occurs.

Further, according to the invention corresponding to claim 6, input means for inputting the monitored process amount, setting means for setting the alarm set value, and the monitored process amount input by the input means, Means for comparing an alarm set value set by the means, alarm display means for displaying an alarm occurrence state based on the comparison output value from the comparison means, and alarm occurrence state based on the comparison output value from the comparison means. Alarm output means for outputting an alarm, a set value changing means for performing processing so as to change the set value only for the alarm display means, When the deviation is equal to or less than a certain value, there is provided an alarm occurrence notifying means for notifying the occurrence of an alarm by a display or a ringing sound which changes in a cycle substantially proportional to the deviation. Can safely and reliably change various set values online without warning to the operation of the plant. It is possible to provide an alarm setting device capable of easily and intuitively grasping a margin with respect to a set value and preparing in advance for a response when an alarm occurs.

Furthermore, according to the invention corresponding to claim 7, input means for inputting a monitored process amount, setting means for setting an alarm set value, and a monitored process amount input by the input means, Comparison means for comparing the alarm set value set by the setting means, and alarm display means for displaying an alarm occurrence state based on a comparison output value from the comparison means,
Alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means, and for a certain period after changing the set value, only the alarm display means performs processing based on the changed set value, Alarm value output means for performing processing so as to perform processing based on the set value before the change;
When the alarm is not generated and the deviation between the monitored process amount and the alarm set value is less than a certain value, an alarm is generated by a display or sound that changes in a cycle substantially proportional to the deviation. Since the system is provided with an alarm occurrence notifying means, it is possible to safely and reliably change various set values in the online state without inadvertently affecting the plant operation even if a setting error occurs. At the same time, it is possible to provide an alarm setting device which can easily and intuitively grasp the margin of the monitored process amount with respect to the alarm set value until the alarm is generated, and can prepare in advance for a response when the alarm is generated.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of an alarm setting device according to the present invention.

FIG. 2 is a block diagram showing a second embodiment of the alarm setting device according to the present invention.

FIG. 3 is a flowchart illustrating an operation of the alarm setting device according to the second embodiment.

FIG. 4 is a block diagram showing a third embodiment of the alarm setting device according to the present invention.

FIG. 5 is a flowchart illustrating an operation of the alarm setting device according to the third embodiment.

FIG. 6 is a diagram showing an example of a data conversion graph used in processing in the alarm setting device according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Input device, 2 ... Setting device, 3 ... Comparison amplifier, 4 ... Alarm display lamp drive circuit, 5 ... Alarm display lamp, 6 ... Output relay drive circuit, 7 ... Output relay, 8 ... Manual switch, 11 ... Input 12 ... Amplifier, 13 ... A / D converter, 14 ... CPU, 15 ... ROM, 16 ... RAM, 17 ... Timer, 18 ... Output port, 19 ... Output relay drive circuit, 20 ... Output relay, 21 ... Operation Unit, 22: operation display interface, 23: display unit, 23A: warning notice lamp.

Claims (8)

(57) [Claims] 1. An input unit for inputting a monitored process amount, a setting unit for setting an alarm set value, a monitored process amount input by the input unit, and an alarm set value set by the setting unit. Comparison means for comparing, an alarm display means for displaying an alarm occurrence status based on a comparison output value from the comparison means, and an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means. An alarm setting device, comprising: alarm output prohibiting means for temporarily forcibly fixing an alarm output from the alarm output means to an alarm non-occurrence state. 2. An input unit for inputting a monitored process amount, a setting unit for setting an alarm set value, a monitored process amount input by the input unit, and an alarm set value set by the setting unit. Comparison means for comparing, an alarm display means for displaying an alarm occurrence status based on a comparison output value from the comparison means, and an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means. An alarm output inhibiting means for temporarily forcibly fixing an alarm output from the alarm output means to an alarm non-occurrence state; and a set value for performing processing so as to change a set value only for the alarm display means. An alarm setting device, comprising: changing means. 3. An input unit for inputting a monitored process amount, a setting unit for setting an alarm set value, a monitored process amount input by the input unit, and an alarm set value set by the setting unit. Comparison means for comparing, an alarm display means for displaying an alarm occurrence status based on a comparison output value from the comparison means, and an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means. During a certain period after the set value is changed, only the alarm display means performs processing based on the set value after change, and the alarm output means performs processing based on the set value before change. An alarm setting device, comprising: a set value changing unit that performs the setting. 4. An input unit for inputting a monitored process amount, a setting unit for setting an alarm set value, a monitored process amount input by the input unit, and an alarm set value set by the setting unit. Comparison means for comparing, an alarm display means for displaying an alarm occurrence status based on a comparison output value from the comparison means, and an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means. When the alarm is not generated and the deviation between the monitored process amount and the alarm set value is a certain value or less, a warning or a warning sound is generated by a display or sound that changes in a cycle substantially proportional to the deviation. An alarm setting device, comprising: an alarm generation notifying unit that performs the following. 5. An input unit for inputting a monitored process amount, a setting unit for setting an alarm set value, a monitored process amount input by the input unit, and an alarm set value set by the setting unit. Comparison means for comparing, an alarm display means for displaying an alarm occurrence status based on a comparison output value from the comparison means, and an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means. An alarm output prohibiting means for temporarily forcibly fixing an alarm output from the alarm output means to an alarm non-occurrence state; and an alarm output in a state where no alarm is generated and the monitored process amount and the alarm set value. When the deviation is equal to or less than a certain value, an alarm occurrence notifying means for giving an advance notice of an alarm occurrence by a display or a ringing sound which changes in a cycle substantially proportional to the deviation. That the alarm setting device. 6. An input unit for inputting a monitored process amount, a setting unit for setting an alarm set value, a monitored process amount input by the input unit, and an alarm set value set by the setting unit. Comparison means for comparing, an alarm display means for displaying an alarm occurrence status based on a comparison output value from the comparison means, and an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means. A set value changing means for performing a process to change a set value only for the alarm display means; and a constant value in which no alarm is generated and a deviation between the monitored process amount and the alarm set value is present. In the following case, an alarm setting notification means for notifying the occurrence of an alarm by a display or a sound that changes in a cycle substantially proportional to the deviation is provided. . 7. An input unit for inputting a monitored process amount, a setting unit for setting an alarm set value, a monitored process amount input by the input unit, and an alarm set value set by the setting unit. Comparison means for comparing, an alarm display means for displaying an alarm occurrence status based on a comparison output value from the comparison means, and an alarm output means for outputting an alarm occurrence status based on the comparison output value from the comparison means. During a certain period after the set value is changed, only the alarm display means performs processing based on the set value after change, and the alarm output means performs processing based on the set value before change. And a setting value changing means for performing, when an alarm is not generated, and when a deviation between the monitored process amount and the alarm set value is equal to or less than a certain value, the change is performed in a cycle substantially proportional to the deviation. An alarm setting device, comprising: an alarm generation notifying unit for notifying the occurrence of an alarm by a display or a ringing sound. 8. The alarm output prohibiting means may be a normal manual switch, a momentary switch that automatically turns off when not pressed with a finger, or a switch that is prominently turned off. The alarm setting device according to claim 1, wherein the alarm setting device is configured to be configured as described above.