KR200282927Y1 - An apparatus of discriminating error in detecting device - Google Patents

Abstract

The present invention relates to a measuring device that detects a change in a control object and controls the amount of change in process control. More specifically, a failure alarm and an operation error are generated by accurately detecting whether an operation error of each part constituting the measuring device is correct. A detection signal deviation detection unit which compares the detection value detected by the detection unit with the control setting value set by the driver and calculates the deviation so as to easily discriminate the detected portion, and the detection signal and the control setting value detected by the deviation detection unit The detection signal deviation comparison unit which compares the deviation with a predetermined detection signal deviation upper limit value and the deviation lower limit value, respectively, and when the detected value of the detection unit is equal to or larger than the deviation upper limit value or the deviation lower limit value occurs as a result of the comparison of the detection signal deviation comparison unit. Detection signal abnormality judging unit judged by the Is an open-circuit signal deviation detector for calculating a deviation from a detection signal of the manipulated-variable detector for detecting the actual operation amount of the operation unit, and an opening degree for comparing the calculated open-circuit signal deviation value with a predetermined open-open signal deviation upper limit value and a deviation lower limit value. The signal deviation comparison unit and the open-circuit signal deviation comparison result indicate that the open-circuit signal abnormality judging unit judges that the operation portion of the operation unit is above the deviation upper limit value or the deviation lower limit value. It is provided with an alarm for alarming the abnormal operation of the detection unit and the operation unit by the determination unit.

Description

Control unit abnormality discrimination device of measuring equipment {AN APPARATUS OF DISCRIMINATING ERROR IN DETECTING DEVICE}

The present invention relates to a measuring device that detects a change in a control object and controls the amount of change in process control. More specifically, a failure alarm and an operation error are generated by accurately detecting whether an operation error of each part constituting the measuring device is correct. The present invention relates to a control amount abnormality discrimination apparatus of a measuring instrument, which makes it easy to discriminate a portion of a part.

1 is a system block diagram showing a configuration of a conventional general measuring device. As shown in FIG. 1, a conventional measuring apparatus includes a detector that detects a control target, that is, a temperature, a pressure, a flow rate, a level, or the like, which is to be controlled in large divisions, and a detection signal detected by the detector and a driver set. And a measurement control unit for calculating a deviation of the received control set value to generate a control operation value, and an operation unit for directly manipulating the change amount of the control object according to the control operation value output from the measurement control unit.

In the operation of the measuring device configured as the closed loop as shown in FIG. 1, the detection signal detected by the detection unit 11 is input to the measurement control unit 14 after performing a predetermined signal processing such as amplification in the detection signal processing unit 12. The measurement control unit 14 receives the control set value from the driver, calculates a deviation from the detection value detected by the detection unit 11, and outputs the control operation value to the operation unit 17. The operation unit 17 adjusts the opening amount in accordance with the control operation value input from the measurement control unit 14 to change the control target detection value on the detection unit 11 side. That is, when the detection value of the detection unit 11 is larger than the control set value, the measurement control unit 14 outputs a value smaller than the control operation value currently output so that the operation unit 17 is closed. When it is smaller than the control set value, the measurement control unit 14 outputs a value larger than the control operation value currently output to repeatedly control the operation unit 17 to be opened to continuously adjust the amount of the control target.

However, in such a conventional measuring instrument, the measurement control unit 14 is repeatedly processed by a program and a parameter which is set without mechanical contact, and thus the probability of failure is relatively low. However, the detection unit 11 and the operation unit 17 installed in the field are relatively small. The probability of failure is relatively high because it is affected by mechanical interference as it is always exposed to foreign matter contained in the control object, temperature, pressure and surrounding environment of the control object. Therefore, if the amount of the control object is detected differently from the actual change amount due to the failure of the detection unit 11 during the measurement control, the measurement control unit outputs the control operation value as an incorrect value, so that the correct control amount of the control object by the operation unit 17 is adjusted. This becomes impossible. Similarly, when a failure of the operation unit 17 occurs, the operation unit 17 is not operated to the same extent as the control operation value output from the measurement control unit 14, thereby preventing accurate measurement control.

In addition, when such a problem occurs, the conventional measuring device cannot monitor the operating state of the measuring device. Therefore, it is difficult to quickly detect the failure state and determine the site where the failure has occurred. Furthermore, a problem that caused a large facility accident occurred.

Therefore, the present invention has been devised to solve the above-mentioned problems, and its purpose is to monitor the operation state of each part of the measuring equipment at all times to quickly determine when a failure occurs and at the same time facilitate the identification of the failure site. It is to provide a control quantity error discrimination device of a measuring instrument so that accurate countermeasures can be taken.

1 is a schematic system configuration diagram showing a general configuration of a conventional measuring instrument.

2 is a system block diagram showing a schematic configuration of a control amount abnormality determining apparatus of a measuring device according to the present invention.

FIG. 3 is a circuit diagram illustrating a detailed configuration of the abnormality discriminating unit shown in FIG. 2.

Explanation of symbols on the main parts of the drawings

100 detector 120 monitor computer

130 Alarm 140 Instrument

160.Control panel 170 ... Control panel

180 ...

In order to achieve the above object, the control amount abnormality determining apparatus of the measuring device according to the present invention includes a detection unit for detecting a physical change amount of an object to be controlled, an operation unit for adjusting a change amount of the control object, and a driving amount for detecting the operation unit. In the control amount control apparatus of the measuring instrument provided with an operation amount detection part,

A detection signal deviation detection unit which compares the detection value detected by the detection unit with the control setting value set by the driver and calculates the deviation, and the detection signal deviation which is preset by using the deviation of the detection signal detected by the deviation detection unit and the control setting value. When the detected value of the detection signal deviation comparison unit comparing the upper limit value and the deviation lower limit value and the detection signal deviation comparison unit is equal to or larger than the deviation upper limit value or the deviation lower limit value, the detection signal abnormality discrimination is judged as the occurrence of abnormal operation of the detection unit. An open-circuit signal deviation detector for receiving a control set value set by the operator and calculating a deviation from a detection signal of the manipulated-variable detection unit that detects an actual operation amount of the operation unit; An opening degree signal deviation comparing unit for comparing the signal deviation upper limit value and the deviation lower limit value; As a result of the call deviation comparison, if the operation amount of the operation unit is equal to or higher than the deviation upper limit value or less than the deviation lower limit value, the detection unit and the detection unit determine the abnormality by the open-circuit signal abnormality judging unit, the detection signal abnormality judging unit, and the opening signal abnormality judging unit. When it is determined that the abnormal operation of the operation unit is characterized in that it comprises an alarm for alarming.

Hereinafter, with reference to the accompanying drawings, the configuration and operation effects of the control amount abnormality detection device of the measuring device according to a preferred embodiment of the present invention will be described in detail.

First, Figure 2 is a system block diagram showing the configuration of the control amount abnormality detection apparatus of the measuring device according to the present invention. As shown in FIG. 2, the control amount abnormality determining apparatus of the measuring device for implementing the present invention includes a detection unit 100 that detects a control object to be controlled, that is, for example, temperature, pressure, flow rate or level. And a detection signal processing unit 110 which performs signal processing such as amplifying the detection signal detected by the detection unit 100 to a predetermined size, and calculates a deviation between the detection signal and the control setting value set by the driver. The measurement control unit 140 that is generated, the signal processing unit 150 that processes and outputs a control operation value output from the measurement control unit 140 by a predetermined signal, and an operation unit that adjusts the amount of the control target according to the signal processing control operation value. A predetermined signal processing such as amplifying the signal detected by the operation driver 160 for controlling the driving of the 170, the operation amount detector 180 for detecting the actual adjustment amount of the operation unit 170, and the operation amount detector 180;The determination result of the abnormality determination unit 200 and the abnormality determination unit 200 for determining whether the signal processing unit 190, the detection unit 100, and the operation unit 170 are abnormal in operation after inputting the measurement control unit 140. It is provided with an alarm 130 to alert the operation of the detection unit 100 and the operation unit 170.

In the above-described configuration, the measurement control unit 140 controls, for example, the proportional integral (PI) control of the deviation between the actual operation change amount of the operation unit 170 detected from the operation amount detection unit 180 and the control operation value output to the operation driver 160. By compensating for the deviation between the operation set value and the actual operation change value of the operation unit 170 to ensure accurate control.

3 is a circuit diagram showing a detailed configuration of the abnormality determination unit for implementing the present invention. As shown in FIG. 3, the detection signal deviation detection unit 210 of the abnormality determination unit 200 for implementing the present invention compares the detection value detected by the detection unit 100 with the control setting value set by the driver. The first comparator AMP1 calculates the deviation.

At this time, the detection signal upper limit deviation comparison unit 220 compares the deviation between the detection signal detected by the deviation detection unit 210 and the control setting value with a predetermined detection signal deviation upper limit value to determine the first transistor TR1. By turning on, the contacts R1 -A of the first relay R1 are turned on. Also, the detection signal lower limit deviation comparison unit 230 turns on the second transistor TR2 when the deviation between the detection signal detected by the deviation detection unit 210 and the control setting value is less than the predetermined deviation lower limit value. The contact R2-A of the second relay R2 is turned on.

At least one relay contact R1 -A (R2) by operations of the first and second transistors TR1 and TR2 of the detection signal upper limit deviation comparison unit 220 and the detection signal lower limit deviation comparison unit 230. When it is determined that -A) is turned on, the detection signal error determination unit 240 includes first and second delay timers 241 and 242 constituting a delay circuit to determine whether an abnormal operation occurs in the detection unit 100. By delaying the operation for the determination reference time (timer setting time) for determining the detection signal abnormal state, it is determined whether the time for which each relay contact is turned on is continuously generated for more than the predetermined abnormal state determining time.

On the other hand, the open-circuit signal deviation detector 250 receives the control set value set by the driver and calculates a deviation from the detection signal of the manipulated variable detector 180 that detects the actual operation amount of the manipulation unit 170. At this time, the calculated opening signal deviation value is input to the opening signal upper limit deviation comparing unit 260 and the opening signal lower limit deviation comparing unit 270, respectively, to compare whether the upper limit deviation value is higher than the lower limit deviation value or less. As a result of the comparison, when the open signal deviation value is above the upper limit deviation value or below the lower limit deviation value, the transistors TR3 and TR4 are operated to excite the relays R3 and R4 connected to the collector terminal, thereby relaying the relay contacts R3-A. (R4-A) is turned on.

Therefore, the open-circuit signal abnormality determining unit 280 compares whether the relay driving time of the open-circuit signal upper limit deviation comparison unit 260 and the open-circuit signal lower limit deviation comparison unit 270 continues beyond the open-circuit signal abnormal state determination time, which is a timer setting time. Third and fourth delay timers 281 and 282 for the delay circuit are provided to determine whether an abnormality occurs in the operation unit.

On the other hand, the field instrument fault determination unit 290 is to determine whether the detection unit 100 and the operation unit 170 has an abnormality and the output signal of the detection signal abnormality determination unit 240 and the open signal abnormality determination unit 280 A first end gate 291 and a detection signal abnormal discrimination unit 240 for receiving a signal from the field instrument fault determination operation condition unit 300 indicating that the operation state of the measurement control unit 140 is selected as an automatic mode and performing an AND operation; The second AND gate 292 and the first AND gate 291 which perform an AND operation on the output signal of the field conditioner fault determination operation conditioner 300 and the inverted output signal of the open position signal abnormality discrimination unit 280. A first flip-flop 293 which receives the output signal of the input signal at the set stage and receives the driving signal of the transistor TR5 driven by the repair completion signal inputted from the driver at the reset stage, and generates a detector fault signal to the Q output terminal. And the output of the second end gate 292 A second flip-flop 294 for receiving a drive signal from a transistor TR5 driven by receiving a call at a set terminal, receiving a repair completion signal, and outputting an operation unit failure signal to a Q output terminal; The third or gate 295 for logically operating the Q output terminal signals of the flip-flop 293 and the second flip-flop 294 and the output signal of the third or gate 295 are input to the set terminal and input from the driver. And a third flip-flop 296 for receiving the alarm acknowledgment signal to the reset stage and outputting the alarm drive signal to the Q output terminal.

Hereinafter, the operation and action effects of the control amount abnormality discrimination apparatus of the measuring device according to the present invention will be described in detail with reference to FIGS. 2 and 3.

First, the detection signal deviation detection unit 210 receives the detection signal of the control target (eg, temperature, pressure, flow rate, level, etc.) detected by the detection unit 110 and the control setting value set by the driver, and the deviation between the two signals. Is detected and output to the detection signal upper limit deviation comparison unit 220 and the detection signal lower limit deviation comparison unit 230.

The second comparator AMP2 of the detection signal upper limit deviation comparator 220 compares the detection signal deviation upper limit value set on the inverting terminal side with the detection signal deviation value output from the detection signal deviation detection unit 210 to obtain a detection signal deviation value. When the deviation is greater than the upper limit, the base drive signal of the first transistor TR1 is output to turn on the first transistor TR1. When the first transistor TR1 is turned on, the first relay R1 connected to the collector terminal is excited to turn on the relay contacts R1-A. Therefore, when the first delay timer 241 of the detection signal abnormality discrimination unit 240 is operated and the detection signal abnormality state determination time set in the first delay timer 241 has elapsed, the timer contact T1-A is turned on. do.

In addition, the third comparator AMP3 of the detection signal lower limit deviation comparison unit 230 compares the detection signal deviation value with the detection signal deviation lower limit value that is variably set by the user, and when the detection signal deviation value is lower than the deviation lower limit value, the second transistor. Turn on (TR2). By driving the second transistor TR2, the second relay R2 connected to the collector terminal is excited and the relay contact R2-A is turned on to operate the second delay timer 242 to detect the abnormal state of the detection signal. When this elapses, the timer driving contact T2-A is turned on.

On the other hand, the measurement control unit 140 receives the change amount of the control object detected by the detection unit 100 in response to the deviation of the control set value set by the driver to control the control operation value for controlling the driving of the operation unit 170 operation operation unit Output to (160). Therefore, the operation unit 170 is driven by the operation driver 160 to a certain degree, and the driving amount is detected by the operation amount detection unit 180 to be input to the opening signal deviation detection unit 250 of the abnormality discrimination unit 200.

The opening degree signal deviation detecting unit 250 calculates a deviation between the operating unit opening signal detected by the manipulated variable detecting unit 180 and the control operation value, and outputs the deviation to the opening degree signal upper limit deviation comparing unit 260 and the opening signal lower limit deviation comparing unit 270. . The open-circuit signal upper limit deviation comparison unit 260 compares the open-circuit signal deviation value and the upper-deviation upper limit value, and the open-signal signal lower-limit deviation comparison unit 270 compares the open-circuit signal deviation value and the upper-deviation upper limit value to determine the deviation value of the open-circuit signal. If greater than or less than the lower limit, the third transistor TR3 and the fourth transistor TR4 are turned on. At this time, the third and fourth relays R3 and R4 are driven due to the driving of the third and fourth transistors TR3 and TR4, and thus the relay contacts R3-A and R4-A are turned on. Thus, the third and fourth delay timers 281 and 282 of the open signal abnormality discriminating unit 280 are operated. In addition, when the opening signal abnormal state determination time set in the timer elapses, the timer driving contact T3-A (T4-A) is turned on to apply a driving signal to the second or gate 283.

The delay timer of the detection signal abnormality discrimination unit 240 and the delay timer of the opening signal abnormality discrimination unit 280 start a count operation as an example at the time when each relay contact is turned on, and thus the predetermined detection signal abnormal state determination time and the opening degree. When the signal abnormal state determination time elapses, the timer is operated to output a high level abnormal state occurrence signal to each input terminal of the first or second gate 243 and 283. At this time, the open-circuit signal abnormal state determination time and the detection signal abnormal state determination time which are set as the reference time for the operation delay in each delay timer are set to the cycle longest time + alpha of the control cycle.

When the abnormal operation of the detection unit 100 and the operation unit 170 is detected by the above-described configuration, the field instrument failure determination unit 290 determines whether the abnormal operation is the detection unit or the operation unit. What should be done is to determine whether the operation unit automatic operation signal, which is the driver setting signal, is input to the fifth delay timer 301 of the field instrument failure determination operation condition unit 300. When the operation of the measurement control unit 140 is set to automatic, the timer contact T5-A is turned on and the first and second end gates are turned on after being delayed for a predetermined time by the fifth delay timer 301. The operation signal is output to the 291 and 292.

Accordingly, in the first end gate 291 of the field instrument failure determination unit 290, an abnormality of a detection signal of the detection unit 100 is generated when the measurement control unit 140 is automatically set, and an abnormality in the opening degree signal of the operation unit 170 is generated. Outputs a high level drive signal to the set end of the first flip-flop 293 only when it is not generated. Accordingly, the first flip-flop 293 outputs a detector failure signal to the output terminal, and the detector failure signal is output to the monitoring computer 120 so that the driver can recognize the occurrence of the detector failure. In addition, the output signal of the first flip-flop 293 is applied to the third or gate 295 and the third flip-flop 296 to drive the alarm 130 to alert the driver of the detector failure.

On the other hand, when an opening signal abnormality occurs and an abnormality of the detection signal does not occur, an abnormal occurrence of the operation unit 170 is detected by the second AND gate 292, and the second flip flop 294 is operated. While outputting an operation unit failure signal to the monitoring computer 120, the operator 130 may be alerted to the operation unit failure signal by the alarm 130 through the third or gate 295 and the third flip-flop 296. .

When the driver recognizes the failure of the operation unit 170 and the detection unit 100 by the alarm operation of the screen of the monitoring computer and the alarm as described above, the driver inspects the failure part and takes measures such as repairing parts and replacing parts. Get drunk. That is, when the abnormal operation of the operation unit 170 and the detection unit 100 is recognized by the driving of the alarm 130, the alarm recognition button 298 is turned on to reset the third flip-flop 296 to operate the alarm 130. Off.

In addition, when the repair of the failure part is completed, the driver turns on the repair completion button 297 and resets the first and second flip-flops 293 and 294 to detect the detection unit 100 and the operation unit ( 170) The failure signal generation is turned off to complete the operation.

The control amount abnormality discrimination apparatus of the measuring device according to the present invention is not limited to the above-described embodiment, and may be variously modified within the range permitted by the technical idea of the present invention.

As described above, the control amount abnormality determining device of the measuring device according to the present invention is configured to detect the change of the control object such as temperature, pressure, flow rate, level, etc., and to adjust the change amount of the control object according to the detection result of the detection unit. By detecting the abnormality of the operation part quickly and accurately identifying the part where the abnormality occurred, it is possible to take quick action on the failure part, which can prevent the deterioration of the product quality and prevent the risk of large equipment accident. Can be.

Claims (1)

In the control amount control device of the measuring device having a detection unit for detecting the physical change amount of the object to be controlled, an operation unit for adjusting the change amount of the control object, and an operation amount detection unit for detecting the drive amount of the operation unit, A detection signal deviation detection unit for comparing the detection value detected by the detection unit with the control setting value set by the driver and calculating the deviation; A detection signal deviation comparison unit which compares the deviation between the detection signal detected by the deviation detection unit and the control setting value with a predetermined detection signal deviation upper limit value and deviation lower limit value, respectively; A detection signal abnormality discrimination unit which judges that an abnormal operation occurs in the detection unit when the detected value of the detection unit is greater than or equal to the deviation upper limit value or less than the deviation lower limit value; An opening degree signal deviation detection unit which receives a control setting value set by an operator and calculates a deviation from the detection signal of the operation amount detection unit detecting the actual operation amount of the operation unit; An opening degree signal deviation comparing unit comparing the calculated opening degree signal deviation value with a predetermined opening degree deviation signal upper limit value and deviation lower limit value; An open-circuit signal abnormality discriminating unit for determining that the operation amount of the operation unit is greater than or equal to the deviation upper limit value or less than the deviation lower limit value; And an alarm for alarming the abnormal operation of the detection unit and the operation unit by the detection signal abnormality discrimination unit and the opening signal abnormality discrimination unit.