CN106919167B - Fault early warning system and method suitable for field bus control - Google Patents
Fault early warning system and method suitable for field bus control Download PDFInfo
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- CN106919167B CN106919167B CN201710264302.3A CN201710264302A CN106919167B CN 106919167 B CN106919167 B CN 106919167B CN 201710264302 A CN201710264302 A CN 201710264302A CN 106919167 B CN106919167 B CN 106919167B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a fault early warning system and a fault early warning method suitable for field bus control, wherein the fault early warning system comprises an analog input module, the analog input module refers to a bus measuring point accessed to a DCS, the output of the analog input module is connected with a switching module, the switching module records measuring points before a set time, the Y output and the N output of the switching module are both accessed to an addition module, the addition module performs subtraction operation on the two input data and then accesses to a large limit and a small limit module, the output of the large limit and the small limit module is connected with a first non-taking module, and the output of the first non-taking module is connected with a first delay module. The conditions of equipment false start, equipment false tripping, unit false tripping and the like caused by the dead halt fault of the field bus equipment are avoided. Improves the production economy of enterprises and avoids a lot of larger or smaller economic losses.
Description
Technical Field
The invention relates to the technical field of field bus control, in particular to a fault early warning system and method suitable for field bus control.
Background
The field bus control is related to domestic large-scale thermal power generation, chemical industry, petroleum, chemical industry, medicine, metallurgy and even manufacturing industry, and the application field is expanding continuously. The computer control system (DAS) is the basis of all automation control, and the reliability and accuracy of real-time numerical values are extremely important. For the whole factory integrated bus control, a bus measuring point is introduced into a DCS control system and is applied to important auxiliary machine interlocking protection. In the debugging process of millions of large-scale thermal power generation, the following defects are found in bus control:
the bus measuring point related to the bus control of the newly built unit is directly cited and added into the interlocking protection condition, and no limiting condition is added. The large-scale unit of the whole factory bus has the condition that the measuring points are subjected to various interferences and fall into a dead state no matter in normal operation or after large and small overhauls.
The bus measuring points related to the bus control of the newly built unit are easy to be connected and disconnected when being interfered by induced voltage. The automatic control system of the analog quantity with the participation of the bus measuring points of the bus control changes the automatic control into an out-of-control state because the measuring points are stopped scanning, but no alarm prompt exists.
The bus measuring point of the newly built unit bus control participates in the interlocking protection control, and the interlocking protection condition is disabled due to the fact that the measuring point is stopped scanning, but no alarm prompt exists.
Disclosure of Invention
The invention aims to solve the problems, and provides a fault early warning system and a fault early warning method suitable for field bus control, which avoid the conditions of equipment false start, equipment false tripping, unit false tripping and the like caused by the 'dead halt fault' of field bus equipment.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a fault early warning system suitable for field bus control, includes analog input module, analog input module draws the bus measurement point of switching in DCS, and switching module is connected to analog input module's output, and switching module still records the measurement point before the settlement time, and switching module's Y output and N output all access addition module, and addition module is cut in the big limit module of little limit after subtracting operation with two data of input, and the output of big limit module of little limit connects first non-taking module, and the output of first non-taking module connects first time delay module.
The switching module also records the measuring point before 1S.
The selection input port of the switching module is connected with a second non-taking module, the input of the second non-taking module is connected with the output of the second delay module, the output of the second non-taking module is fed back to the input of the second delay module, and the closed loop second non-taking module and the second delay module jointly realize the function of recording the set time; the switching module decides whether the output is Y output or N output through the selection input port.
And the delay time of the second delay module is 1S.
The maximum limit and the minimum limit of the maximum limit and the minimum limit module are 0.0001 and-0.0001 respectively, and when the input value is more than 0.0001 or less than-0.0001, 1 is output.
And the delay time of the first delay module is 5S.
Adding the fault early warning system to each important measuring point participating in automatic adjustment and interlocking protection;
the measurement point without alarm for each bus measurement point is used for interlocking protection and automatic adjustment, and the measurement point with alarm is used for popping up the special photon card for the important bus measurement point as the output DO of the measurement point with alarm.
The fault early warning method of the fault early warning system suitable for field bus control comprises the steps of introducing DCS into signals transmitted from a field bus;
comparing the numerical value of the bus measuring point with the measuring point of the previous scanning period according to the scanning period of the DCS;
and calculating the measuring point difference value between the scanning periods, and outputting an alarm signal after the numerical value is kept unchanged for a set time.
The bus measuring point accessed to the DCS is referenced by an analog input module, then is accessed to a switching module, the switching module records the measuring point before the set time, the switching module is accessed to an addition module, meanwhile, real-time data is also accessed to the addition module, the two data are subtracted and compared and then are accessed to a large limit and a small limit module, and finally, the two data are sent to a first non-taking module, and a fault dead point alarm of a certain bus measuring point is output.
When the bus value continuously changes, the output of the large-limit and small-limit module is 1, and the scanning is stopped after the bus measuring point is dead point, namely the measuring point is kept in a numerical value state, and after the first non-taking module acts, the output measuring point is 1 when in a fault state.
The invention has the beneficial effects that:
the stability of the distributed control system DCS is utilized to monitor the operation parameters of the field bus equipment in real time, so that the connection between the systems is tighter.
Provides more stable monitoring for the safe and stable operation of domestic large-scale thermal power generation, chemical industry, petroleum, chemical industry, medicine, metallurgy and even processing and manufacturing industries.
The conditions of equipment false start, equipment false tripping, unit false tripping and the like caused by the dead halt fault of the field bus equipment are avoided.
Improves the production economy of enterprises and avoids a lot of larger or smaller economic losses.
Drawings
FIG. 1 is a fault early warning system of the present invention;
figure 2 is a photon card embodiment.
Detailed Description
The invention will be further described with reference to the drawings and examples.
In order to realize the accuracy and the reliability of bus control after encountering the problems in the background art, namely realize the safe operation of the unit, the following approaches are adopted to solve:
the fault early warning system shown in figure 1 is added to each important measuring point participating in automatic regulation and interlocking protection, the measuring point without alarm for each bus measuring point is used for interlocking protection and automatic regulation, and the measuring point output DO with alarm is used for popping up the special photon card for the important bus measuring point.
A fault early warning system suitable for field bus control comprises a field bus control system and a distributed control system DCS control system, and comprises: the system comprises two delay opening modules TON1 and TON2, two non-sampling modules N1 and N2, a switching selection module T, an addition module sigma, a large-limit and small-limit module H/L and an analog quantity reference block AI.
The bus measuring point accessed to the DCS is referenced by an analog input module, then is accessed to a switching module, the switching module records the measuring point before 1s, is accessed to an addition module, simultaneously, real-time data is also accessed to the addition module, the two data are accessed to a large limit and small limit module after subtraction comparison, and finally, the two data are sent to a first non-taking module, and a fault dead point alarm of a certain bus measuring point is output.
The switching module determines whether the output is the "Y" or "N" end of the input through selecting the input port. The selective input port of the device realizes the function of 'recording a numerical value for one second' by utilizing a closed loop second non-taking module and a second delay module (the input is 1 time, and the output is 1 after a certain time is 1 second). (wherein the second delay module function parameter is set to 1 s)
The addition module completes the task of subtracting and comparing the bus measuring point in the period with the bus measuring point in the last second through the setting of parameters.
The big limit and small limit module compares the input value with the big limit of the set value of 0.0001 and the small limit of 0.0001, and outputs 1 when the input value is more than 0.0001 or less than-0.0001.
When the bus value continuously changes, the output of the large-limit small-limit module is 1, however, after the bus measuring point is dead point, scanning is stopped, namely the measuring point is kept in a value state, when the output measuring point is judged to be in a fault state, the output of the large-limit small-limit module is 1, and then the first non-taking module is finally added.
The switching module completes the switching memory of 'Y' and 'N' through the change in the scanning period.
The addition module determines the subtraction of parameters in two scan periods by the "+" and "-" parameters in the pins.
The parameters in the large-limit and small-limit module are large selection '0.0001' dead zone '0' and small selection '-0.0001' dead zone '0', respectively, so as to judge whether the parameters in two scanning periods are changed or not.
And the final delay of the first delay module TON1 is 5s, and the fault is output for judging that the parameters are unchanged all the time within 5s.
The use method of the invention comprises the following steps: the output of the detected points judged by the invention is displayed in the upper computer unit set picture, the sub-system configures the detected points, and after the single important detected point of a certain system is in dead point fault, the alarm pop-up picture is carried out in the mode shown in figure 2, so that a thermal maintenance team is timely reminded of carrying out cautious treatment work on the detected points.
By adopting the fault early-warning method of the fault early-warning system suitable for field bus control,
referencing the DCS to signals transmitted from the fieldbus;
comparing the numerical value of the bus measuring point with the measuring point of the previous scanning period according to the scanning period of the DCS;
and calculating the measuring point difference value between the scanning periods, and outputting an alarm signal after the value is kept unchanged for 5s.
The invention is suitable for the fault early warning system of the bus control of the domestic large-scale thermal power generation, the chemical industry, the petroleum, the chemical industry, the medicine, the metallurgy, even the enterprises or the companies of the processing and manufacturing industry and the like, and the invention utilizes the configuration of the DCS to complete the fault monitoring of the bus measuring point, thereby preventing the equipment from being damaged or the abnormal shutdown caused by the fault of the individual bus measuring point.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (8)
1. The fault early warning system is characterized by comprising an analog input module, wherein the analog input module refers to a bus measuring point accessed to a DCS, the output of the analog input module is connected with a switching module, the switching module records the measuring point before the set time, the Y output and the N output of the switching module are both accessed to an addition module, the addition module performs subtraction operation on the two input data and then accesses to a large limit and small limit module, the output of the large limit and small limit module is connected with a first non-taking module, and the output of the first non-taking module is connected with a first delay module;
the switching module also records the measuring point before 1S;
the selection input port of the switching module is connected with a second non-taking module, the input of the second non-taking module is connected with the output of the second delay module, the output of the second non-taking module is fed back to the input of the second delay module, and the closed loop second non-taking module and the second delay module jointly realize the function of recording the set time; the switching module decides whether the output is Y output or N output through the selection input port.
2. The fault early warning system for fieldbus control of claim 1 wherein the delay time of the second delay module is 1S.
3. The fault early warning system for fieldbus control of claim 1 in which the maximum limit of the maximum limit and minimum limit module is 0.0001 and the minimum limit is-0.0001, and outputting 1 when the input value is greater than 0.0001 or less than-0.0001.
4. The fault early warning system for fieldbus control of claim 1 in which the delay time of the first delay module is 5S.
5. The fault early warning system for field bus control as claimed in claim 1, wherein the fault early warning system is added to each important measurement point participating in automatic adjustment and interlocking protection;
the measurement point without alarm for each bus measurement point is used for interlocking protection and automatic adjustment, and the measurement point with alarm is used for popping up the special photon card for the important bus measurement point as the output DO of the measurement point with alarm.
6. A fault pre-warning method using a fault pre-warning system adapted for field bus control as defined in claim 1, comprising, referencing DCS to signals from the field bus transmission;
comparing the numerical value of the bus measuring point with the measuring point of the previous scanning period according to the scanning period of the DCS;
and calculating the measuring point difference value between the scanning periods, and outputting an alarm signal after the numerical value is kept unchanged for a set time.
7. The fault early warning method as claimed in claim 6, wherein the bus measuring point connected to the DCS is referenced by an analog input module, then connected to a switching module, the switching module records the measuring point before the set time, the switching module is connected to an addition module, simultaneously, real-time data is also connected to the addition module, the two data are subtracted and compared, and then connected to a limit module, and finally, the two data are sent to a first non-taking module to output a fault dead point alarm of a certain bus measuring point.
8. The method of claim 7, wherein when the bus value is continuously changed, the high-limit and low-limit module outputs "1", and the scanning is stopped after the dead point of the bus measuring point, that is, the measuring point is kept in a value state, and after the first non-taking module acts, the output measuring point outputs "1" when the measuring point is in a fault state.
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