Control system protecting device and protecting method based on temperature measurement

Abstract

The invention discloses a control system protecting device and a control system protecting method based on temperature measurement. The protecting device comprises a temperature sensor, an effective value processing unit and a linkage judgment unit, wherein the temperature sensor is used for measuring the temperature of a control device and outputting the measured temperature, the effective value processing unit is used for calculating the effective value of the measured temperature and outputting the effective value of the temperature, and the linkage judgment unit is used for comparing the effective value of the temperature and the preset effective value and outputting abnormal alarm signals to an alarm device and / or linkage cutting protecting signals to a control system when the effective value of the temperature is not smaller than the preset effective value. The protecting method comprises the steps of temperature measurement, effective value processing and linkage judgment. The control system protecting device and the control system protecting method have the advantages that through the preset effective value, when temperature measuring points generate wire breakage, short circuit and poor contact, collected data are processed and compared in a specified time, data considered to be false signals by a system is isolated in time and processed, the control system linkage protection misoperation caused by false signal input is avoided, and the reliability of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of industrial automation, and in particular relates to a temperature measurement-based protection device and a protection method for a control system that can effectively improve reliability. Background technique [0002] The temperature measurement reliability of large-scale equipment is especially important for the safe operation of the entire unit, and whether the temperature measurement value is true and reliable is related to whether the entire unit control system can effectively avoid unnecessary malfunctions, so that the interlock protection of the control system can effectively ensure large-scale Safe and reliable operation of equipment. The traditional control system chain protection considers the absolute safety of the unit, but in practical applications, the absolute reliability of the unit is more required. Taking ironmaking blast furnace fans as an example, under normal circumstances, there wil...

AI Technical Summary

Problems solved by technology

Taking ironmaking blast furnace fans as an example, under normal circumstances, there will be basically no high temperature. Even if the temperature rises beyond the interlock action, it will stop. But it has become the killer of the control system, directly threatening the safe operation of the equipment, often causing unnecessary shutdowns and huge losses

[0003] PLC is an industrial control system widely used at present, and the CPU is the core of the software and hardware of the entire control system. When the general controller completes the basic data signal processing, it has flexible alarm processing and quality code functions. Although each manufacturer produces The control systems have their own quality codes, but only the basic protection measures are considered, and generally only meet the basic control requirements, and cannot meet the safety requirements of large-scale equipment on site

In the industrial control system protection device based on temperature measurement, no matter the temperature sensor is in poor contact, disconnection, short circuit or interference, the measurement signal such as resistance will rise rapidly, and the PLC control system will inevitably receive a false signal leading to the connection. The output of the misoperation signal of the lock stop indirectly causes the occurrence of equipment misoperation accidents

Although the control systems in the prior art will adopt certain measures to protect against temperature interference, the levels are different, the effect of use is not obvious, and the limitations are too large; The lock has a great influence, and it is difficult to avoid the interference of false signals on the control system

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