JPS5943408A - Alarm annunciator - Google Patents

Abstract

PURPOSE:To permit alarm tracking after warning by outputting the direction of movement to a display device every time when a process input at every monitor input point movces by a preset constant at an upper or lower limit value in an increasing or decreasing direction. CONSTITUTION:A process variable at a monitor input point is detected by a detector S, whose detection signal S is converted into a digital signal PD through a process input device 1. This signal PD is converted 2 into an engineering unit numeral V, which is applied to a limit value comparing means 3. This limit value comparing means 3 has the preset upper and lower limit values and compares the input signal V with them to judge a normal or deviation state, outputting the result to a zone detecting means 4. This zone detecting means 4 detects at which preset constant section position the signal V is in the increasing or decreasing direction of the upper or lower limit value and displays the deviation from the upper or lower limit value and its direction on a display device 7 through an alarm tracking detecting means 5 and an output control means 6.

Description

[Detailed description of the invention] Technical field of invention The present invention relates to a process quantity alarm notification device.

TECHNICAL FIELD OF THE INVENTION AND PROBLEMS THEREOF Generally, an alarm device compares a signal obtained by a detector with a set value thereof, and outputs an alarm message when an alarm occurs. What is important for an alarm system is that the current value after an alarm is updated one after another.
The function is to notify the movement of the monitoring input point after the alarm is issued, and conventional alarm devices did not have this function.

Therefore, conventional alarm devices merely notify the user of the occurrence of an alarm.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a past report notification device that enables alarm tracking after a limit value deviation, that is, after an alarm, which is a drawback of conventional one-time notification devices.

This refers to the direction of this alarm tracking monitoring input point, whether it is moving away from or approaching the limit value, and where the current value is relative to the limit value. SUMMARY OF THE INVENTION The present invention provides a process input device that reads a process quantity at a monitoring input point of a plant, compares the read value with a preset limit value, and displays the result of the comparison ( Abnormal transition or normal return) A data processing device to notify all external parties and information from this data processing device? ? Fully equipped with a display device that outputs small values, - for each row monitoring input point in the upper and lower direction of the upper and lower limit values (
τ, a constant (hereinafter referred to as delta) is set in advance, and each time the process human power from the monitoring input point moves by delta, the direction 3 is output to the outside and the locus of the alarm state of the monitoring input point that has entered the information area. The special feature is that it makes it possible to trace the

Examples of the invention Z, which is an embodiment of the present invention will be explained below based on the gold drawings.

FIG. 1 is a block [''] showing one embodiment of the present invention.

The detector S detects the process quantity at the monitoring input point,
The output electric signal P of this detector S, which is a device that outputs a soot signal, is led to a process input device 1, where it is converted from a full air signal to a digital signal FD.

The digitized signal FD is led to an engineering unit conversion means Z and converted into an engineering unit numerical value. This conversion method has a unique constant (digital signal pair/biological unit value) for each input point of the process, and is performed using a general mathematical formula. Typical mathematical expressions include y=a and I-+b. For example, FIG. 6, which will be described later, shows an example of general process input, and in this figure, the engineering unit position at the scanning question point t is 102 (K P A ). The converted engineering unit value V is led to the limit value comparison means 3, where it is compared with the limit value set by the process input.

Figure 2 is a detailed diagram of the limit value comparison means 3. This limit value comparison means 3 has three scale comparison logics for the given input V, and any one of them is satisfied. When the 0 condition is violated, the condition type is stored in the memory HVc.0, I (= 2, the upper limit value is exceeded, H
When =O, the input value is within the upper and lower limits and is in normal condition, H = 1
When , it means that the lower limit value has been exceeded. The upper limit value and the lower limit value are stored in an upper limit value table and a lower limit value table, and those corresponding to the process input are extracted. This limit value comparing means 3 has three types of outputs H6, H, . . . H2, and these also output the same engineering unit value as the input only to the exit where the conditions are met.

Next, the signals HI r H2 from output 1 and output 2 among the three signal outlets are guided to the zone detection means 4.\.

On the other hand, the control signal Ho of 0 is sent to the determining means J, which will be described later. The zone detection means 4 is a part that detects as a specific numerical value the position of the signal ■ in the upper and lower directions of the upper and lower limit values. Explain zones.

-L″T of the upper limit value: In order to detect at which position in the direction the process value of the monitoring input point is located,
Set delta A to . Fig. 6 1.1 Lowering the example of the upper limit value,
'-C is present, the upper limit is 100 (i<Pi~), and the delta is 5 (KPA). 5 (Jζ■'' people) sections (hereinafter referred to as zones) are created in the direction of the upper limit value from both numbers 2 to 2. Note that it is assumed that the zone closest to the limit value is 1 in total.

Therefore, 100 (KPA) to 105 (KPA) is zone 1.10b (KPA) rc et 110 (Kl'A) is sea 72°1io (■<i'A) to 115 (KPA
) becomes zone 3.

1: Same (provide up to zone n).

Now, returning to FIG. 3, the zone detection means 4 will be explained.

The zone detection means 4 has an outlet - and an output [ of the limit value comparison means 3.
Signals H,,H,, from 12 are input.

Although the signals H, , H, , are not input at the same time, there are an upper limit zone calculating means 41 and a lower limit zone calculating means 42 corresponding to the signals HI and H2, which are linked to the input signals. Upper limit zone calculation means 41 and lower limit zone calculation means 42
The contents of the calculations are basically the same, and calculations are performed to calculate the delta Δ set for each input into a Δ table area to determine the zone number. The signal a as a result of the calculation takes 1 to n as shown in the formula, and this is the zone M. , which is output as a signal 9 to the zone detection means 4.

The signal 9 is then guided to the alarm tracking detection means 5. Figure 4 is a detailed diagram. a4-5#i a
This is the previous value of (zone No., ). There are three judgment logics in the alarm tracking detection means 5. (a) a4-1 =, FFFF (condition satisfied 1)
-'1X=1) The previous value of zone positive is the initial value FFF
Test whether it is F (any other value may be used if #lJ can be cut). If the limit value comparison means 3 currently determines that there is a limit value deviation, and the previous value zone positive does not show the initial value 4, it can be determined that the limit value deviation has occurred for the first time, so the first limit value deviation is detected. It is C1 chic for.

(b) a>a-1 (when condition is met, X-2) - This logic is based on the previous zone Nn construction and the current zone, whether the zone positive determined by the detection means 4 is large, that is, there is a zone change, and the monitoring input is There is a logic "C" for detecting whether the value tends to move further away from the limit value.

(”) a (a −5 (when condition is met:
> Set 0, save the result in ・X, and exit 'C'. For the next time, save the current zone Nn value a gold α, 2-1. The alarm tracking detection means 5 is linked to the output control means 6.

The output control means 6 has a function of assembling change information obtained within the apparatus into a format that can be displayed externally and requesting it from an external display device [7]. Message output will be explained as an example of external output.

The traditional message format consists of time, input point number, input point name, current value, large/small symbol, limit value, unit and flash function. The output control means 6 uses the information H obtained by the limit value comparison means 3 and the information X obtained from the alarm tracking detection means 5 in a conventional message format to determine LO (Low) or HI (Hlgh)ff stored in the II table.
The RTN (Return) stored in the i or
), ALM (Alarm).

WR8 (Worse), BTR (Better)
) 'Modify it with iNT and X, extract it, and add it to the conventional message format. Note that the zone tJaa is also added as distance information from the limit value, and an output request is made to the external display device 7.

(37) is created by the output control means 6 and displayed on the display device 7). Examples of message formats are described.

114 When the output is completed by the force control means 6, the index ii for specifying the next monitoring input point increases. When ○i reaches the specified value, the input of that cycle is read and 9'? This means that the report check has been completed, so return all input point specifications to the first point and delay. If the value of 01 to be transferred has not reached the specified value, the control is returned to ■ and the manual point specified by i is processed.

One means of delay is simply to control the entire prescribed time delay,
After the delay, the control is transferred to the O output of the limit value comparison means 3 (normal exit within the limit values), and when the signal I (o is output), the control is transferred to the determination means J, and the control is transferred to the determination means J, and the control is transferred to the a-3 (previous zone). No, ) is the initial value (not in the previous alarm state and fLtj).al,...p''FFF
' When the logical judgment is established, it is determined that the input point l was normal in the previous cycle, and the controller instructs the output control means 6 and moves on to processing the next input point. . When logical judgment fails 1・Ma,+”n
This means that some fragmentation was stored in a·□-1 in the same period as j. This also means that all limits have been exceeded (I7).

Furthermore, since the current time is within the set limit value, it is determined that normality has returned. Return to normality Set the index to output to all external devices as X2O (RTN) and II=O (blank). In addition, set ai l to indicate that normal return has been confirmed.
Let be FFFF.

When the movement of the process input shown as an example in FIG.
oYou can get a message like the one shown in Figure 7.OAs you can see from this example, the message TYPE, TRA
Look at CK and ZONE and check whether it is a new 0 alarm or an even worse alarm, which is suitable for power 1 good b 1 direction m, etc. The movement force of the monitoring input (it is possible to judge at a glance) Effects of the Invention In order to sufficiently show the current values of plant inputs that change from moment to moment and their direction, graphical display is good, but display devices (generally CRT) are also limited. C) Economically large quantities Furthermore, if an attempt is made to automatically add or delete items (in this case, alarm input) each time an event occurs, a character type CRT or printer is generally used. In this character type display device, if the current value of the process variable, the direction of the value, and the distance from the limit value [°7W] are displayed, it is used as an alarm notification device.
(is sufficient1) The following effects can be mentioned as effects of the present invention.

In other words, adding directionality and playing a certain guiding role in the operator's response operations has become T'iJ function. Provide operational priorities for personnel. Furthermore, when a process variable moves by a certain value, it is now possible to output a message again to grab the operator's attention and completely prevent a delay in response. In addition, contents that were conventionally realized by graphic display etc. can be represented by a single character display, which can also be economically advantageous.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of limit value comparison means, FIG. 3 is a block diagram of zone detection means, and FIG. 4 is a block diagram of alarm tracking detection means. FIG. 5 is a block diagram of the output control means and the display device, FIG. 6 is a characteristic diagram when the process input exceeds the upper limit value, and FIG. 7 is a plan view showing an example of the display of the display device. S...Detector, 1...Process input device, 2...
Engineering unit conversion means, 3...Limit value comparison means, 4...
Zone detection means, 5... Alarm tracking detection means, 6... Output control means, 7... Display device, 8...
・One way to delay. (7317) Agent: Patent Attorney Noriyuki Chika (and 1 other person) Figure 2J Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A process input device reads a process input at a monitoring input point of a plant, and when the read value deviates from preset upper and lower limit values, the monitoring input point reads each monitoring input in the direction above and below the upper and lower limit values. a data processing device that outputs the direction to the outside each time a point is moved by a preset constant; and a display device that displays that the process input deviates from the upper and lower limits and the directionality of the process input. An alarm alarm device consisting of.