JPH07200052A - Measuring process value change rate abnormality monitoring device - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to an apparatus for monitoring an abnormality in a measurement process value change rate, and particularly aims to accurately perform a measurement process value change rate monitoring. [Structure] Process value with fixed interval cycle (arbitrary setting: XP
The value obtained by adding the change width alarm set value (arbitrary setting: XPR2) to the process value at the start point of the monitoring cycle is used as the alarm output set value at the next monitoring cycle, and the process value is output at the same point. A feature is that an abnormal alarm is output when the set value is exceeded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring apparatus for measuring process value change rate abnormality, and particularly to accurately monitor the measuring process value change rate.

[0002]

2. Description of the Related Art The temperature, pressure, and liquid level of equipment to be controlled and monitored that has an object to be measured are displayed in engineering units on a controller (control device main body and CRT) and operated on the object to be controlled through a detector. It outputs a quantity, sets the process value of the object to be measured, sets an upper and lower limit value, and outputs an abnormal alarm, thereby determining that the process is abnormal, and performing the action and trouble monitoring of the operation of the controlled and monitored equipment. Also, the rate of change of process value / 1 scan (100 m to 1 sec) is monitored.

[0003]

As a problem of the prior art, the abnormality monitoring method of the measurement process value is the upper and lower limit setting (fixed setting value) and PV change rate / 1 scan (100 m to 1 s).
ec) only. Therefore, in operation, there is a problem that a process abnormality within the upper and lower limit set values and a process abnormality whose PV change rate can be judged only in a long time span cannot be found.

[0004]

The present invention advantageously solves the problems of the prior art, in which a process value is read at a constant interval period (arbitrary setting: XPR1) and changed to a process value at the starting point of the monitoring period. Width alarm set value (optional setting: XPR
The value obtained by adding 2) is used as the alarm output setting value at the time of the next monitoring cycle, and when the process value exceeds the alarm output setting value at the same time point, an abnormal alarm is output, which is characterized by an abnormal measurement process value change rate. It is a monitoring device.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 1 shows the equipment configuration used in the present invention. 1 is a rolling mill,
It is a device mainly composed of rolling rolls and backup rolls. An oil tank 2 is a device for cooling and storing the lubricating oil supplied to the rolling mill 1. The rolling mill 1 and the oil tank 2 are facilities for control and monitoring that have an object to be measured. Reference numeral 3 is a level detector, which converts the pressure of water in the oil tank into an electric signal and outputs it to the control device 6. A temperature detector 4 is installed in the return pipe of the lubricating oil supplied to the backup roll bearing of the rolling mill 1 and outputs an electric signal to the control device 6 of FIG. A pressure detector 5 detects the pressure of the lubricating oil supplied to the backup roll bearing of the rolling mill 1, converts the pressure into an electric signal, and outputs the electric signal to the control device 6. A control device 6 is composed of a control device main body and a CRT, inputs signals from the level detector 3, the temperature detector 4, and the pressure detector 5 and displays them in engineering units or outputs manipulated variables to a controlled object. Is to do.
At the same time, operator guidance is output and displayed for the process abnormality due to the abnormality determination of the process value and the system abnormality of the control device itself. Reference numeral 7 is an operator guidance device for inputting process abnormal output from the control device 6 and providing guidance by voice.

FIG. 2 shows the change over time in which the rate of change of the process value is monitored at a constant interval cycle (arbitrarily set) according to the present invention, and an alarm is output when an abnormality occurs. The horizontal axes of the upper and lower parts of FIG. 2 are time. The upper vertical axis represents the process value%, and the lower vertical axis represents the alarm output state (2 positions). In the upper part of FIG. 2, the process value is read at a constant interval cycle (arbitrary setting: XPR1), and the monitoring cycle start point (t1)
Change value for the process value of the alarm setting value (arbitrary setting: XPR
The value obtained by adding 2) is used as the virtual alarm output set value (ΔH1) up to the next monitoring cycle time point (t2). If the process value exceeds the virtual alarm output set value within the same period (T1), an abnormal alarm is output. Next monitoring cycle (T1, T2, T3 ...)
Virtual alarm output setting value in (ΔH1, ΔH2, ΔH3
・ ・) Will be updated every monitoring cycle.

FIG. 3 shows a functional flow of the present invention.
This function is constructed by a soft sequence in the controller.

Bits are output at a fixed interval cycle that is arbitrarily set (XPR1), which determines the monitoring cycle of the process value change rate, and is used as another condition of this functional flow. Replaces and saves the current process value (.PV) from the start point of the cycle to the next start point (XPR
3 '). Is to add (+) an arbitrarily settable allowable change width value (XPR2) to the process value at the start point of the monitoring cycle stored (XPR3 ') to determine the virtual upper and lower limit set values. Compares the virtual upper and lower limit set value determined in step 3 with the current process value (.PV), and outputs an abnormal alarm if it exceeds and is within the monitoring period. The operator guidance is provided on the CRT for the abnormality in the process value change rate output in step.
In addition, when performing the downside change rate abnormality monitoring, the addition (+) in is changed to division (-), and the comparison symbol in becomes the reverse direction (≦).

[0009]

According to the present invention, when the abnormal alarm set value of the measured process value is within the upper and lower limit settings (fixed set value), the abnormal process value change rate and the PV change rate can be judged only in a long time span. Anomalies can be easily found. As a result, it is possible to easily find out the equipment trouble that is the target of control and monitoring.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a diagram showing a change in process value with time according to the configuration of FIG.

FIG. 3 is a diagram showing a functional flow of an embodiment of the present invention.

[Explanation of symbols]

 1 rolling mill 2 oil tank 3 level detector 4 temperature detector 5 pressure detector 6 controller 7 operator guidance device

Claims (1)

[Claims] 1. A process value is set at a constant interval cycle (arbitrary setting:
It is read by XPR1) and the value obtained by adding the change width alarm set value (arbitrary setting: XPR2) to the process value at the monitoring cycle start point is set as the alarm output set value at the time of the next monitoring cycle, and the process value is set as the alarm output at the same point. A monitoring device for abnormalities in the rate of change in measurement process values, which outputs an abnormal alarm when the value exceeds the specified value.