CN114460910A - DCS-based analog quantity change judgment method, DCS-based analog quantity change judgment equipment and storage medium - Google Patents
DCS-based analog quantity change judgment method, DCS-based analog quantity change judgment equipment and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a device and a storage medium for judging analog quantity change based on DCS, wherein the method comprises the following steps: starting to execute a main program, and synchronously judging the change of the analog quantity; setting a delay time before the analog quantity change judgment; performing data acquisition recording and processing capacity judgment by the DCS controller in a circulating manner, and comparing whether the analog quantity value recorded by the controller in the previous period is consistent with the analog quantity value recorded in the current period or not; the action of a timer and the timing judgment are carried out; outputting corresponding protection actions; and finishing the reset. Therefore, on the basis that the DCS takes the instantaneous value of the analog quantity as the process control terminal judgment, the judgment of the change of the real-time value of the analog quantity is added, so that the continuous existence of the effectiveness of the analog quantity as the terminal judgment condition is ensured, the DCS can generate related protection actions in time when an abnormal condition occurs, the damage of related controlled equipment is avoided, the process control is more reliable and safer, the load of manual participation and monitoring in the process control is reduced, and the automation degree is improved.
Description
Technical Field
The invention relates to the technical field of automation, in particular to a method, equipment and a storage medium for judging analog quantity change based on DCS.
Background
The DCS is a Distributed Control System (Distributed Control System) that is an instrument Control System based on a microprocessor and using a design principle of Distributed Control functions, centralized display operations, and consideration of both sub-autonomous and comprehensive coordination. The analog quantity in the DCS is used as a continuously variable quantity, is commonly used in various condition judgment scenes, and sends corresponding instructions according to the judgment result so as to control the action of field equipment. However, in the process, the scenes of instantaneous value judgment of the analog quantity are more, and the characteristic that the analog quantity can be continuously changed is often ignored, so that the judgment condition is insufficient, and the result that the setting of the related equipment protection measures is incomplete is caused.
For example, in the process of delivering fluid materials to a storage tank by using the liquid level as a judgment, the judgment of the end point of the process is usually based on the fact that the liquid level reaches a high limit value. After the materials are conveyed to the storage tank, the DCS sends an instruction to start the relevant valves and the pump equipment, and along with the continuous entering of the materials into the storage tank, when the liquid level instantaneous value reaches or exceeds a preset high limit value, the DCS sends a stop instruction to close the relevant valves and the pump equipment. But in abnormal conditions, such as the disconnection of the liquid level signal or the damage of the liquid level measuring instrument, etc. Even if the amount of the materials entering the storage tank reaches the preset value, the DCS control system cannot effectively judge the process end point due to the abnormity or the failure of the judgment condition, so that the materials overflow the storage tank or the mechanical pump runs for a long time to be damaged.
The same problem may occur in related applications that a weighing device is used for judging the liquid material transportation, or a thermometer is used for judging the temperature rise and fall, and the like, and an analog quantity instantaneous value is used as a DCS (distributed control system) system for judging the process control end point.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a DCS-based analog quantity change judgment method, equipment and a storage medium.
The invention provides a DCS-based analog quantity change judgment method, which comprises the following steps:
step S1, starting, executing the main program, and synchronously starting the auxiliary program for judging the change of the analog quantity;
step S2, delaying, namely, arranging an instrument for judging the analog quantity on the target equipment, and setting delay time before judging the change of the analog quantity;
step S3, real-time value judgment, namely, data acquisition and recording and processing capacity judgment are carried out through the circulation of the DCS controller, and whether the analog quantity value recorded by the controller in the previous period is consistent with the analog quantity value recorded in the current period or not is compared;
step S4, the timer acts, the timer in the DCS controller is called to time, if the analog quantity changes, the timer is cleared; if the analog quantity is not changed, the timer normally times;
step S5, timing judgment, judging whether the accumulated time of the timer exceeds the set value, if yes, performing the protection action of the subsequent steps; if not overtime, not making protection action, but recording the analog quantity value of the period, namely the instantaneous value of the period, and continuously judging whether the analog quantity value changes or not by using the subsequent program circulation;
step S6, protection action, corresponding protection action output;
step S7, resetting, if not, the program continuously generates protection action; if the operation is reset, the protection action is eliminated, the operation is consistent with the non-overtime action in the step S5, and after the analog quantity value of the period is recorded, the subsequent analog quantity value change judgment is continuously and circularly executed;
step S8, ending the analog quantity change judging program and the main program at the same time, if no protection action is generated and the operation process is normally ended, ending the analog quantity judgment; if the protection action is generated, the protection action execution is finished together with the main program.
In step S3, a dead zone range is set for the comparison value, i.e. the variation of the measured analog quantity value within the dead zone range is considered to be invalid; judging whether the value recorded in the period is smaller than the difference value between the upper period value and the dead zone or larger than the sum value of the upper period and the dead zone, and if the value is beyond the range of the dead zone, determining that the analog quantity has change; if the dead zone range is not exceeded, it is assumed that there is no change in the analog quantity.
In step S1, the main routine is a material beating routine in a liquid material beating process.
In step S2, after the material is filled into the storage tank, the conveying equipment is started, and the liquid needs to be conveyed through the pipeline to enter the storage tank, so as to perform the operation of measuring the liquid material level gauge in the storage tank.
In step S6, the protection action includes generating an alarm, or sending a stop command to close the corresponding pump and valve device during the material transportation process.
After the materials are unloaded from the tank wagon, the feeding valve and the material beating pump are started, whether the liquid level of the storage tank reaches a preset limit value or not is judged, the limit value is determined according to the specific height of the storage tank or the feeding requirement, when the liquid level is larger than or equal to the preset limit value, the feeding valve and the material beating pump are closed, and the feeding process of the storage tank is finished.
Preferably, when the device is started for material beating, whether the liquid level value reaches the preset limit value or not is judged, and whether the liquid level value changes within the preset time or not is also judged in a delayed manner,
if the time that the liquid level is unchanged exceeds the preset time, the state is considered as an abnormal working condition, an alarm is generated, and the step of closing the equipment is also carried out to finish the material beating process.
Preferably, after the starting equipment starts to knock materials, the materials are conveyed into the storage tank through a pipeline for a certain time, the liquid level of the storage tank begins to change at the moment, and the change judgment of the liquid level is started after a certain delay time is set;
judge whether the liquid level is unchangeable overtime, continuously squeeze into the material in the storage tank under the great condition of storage tank volume, then the liquid level becomes another value intermediate time longer by one value, consequently can not carry out corresponding protection action at once when the liquid level is unchangeable, but judges the duration that the liquid level is unchangeable, if exceed reasonable time then judge for unusual operating mode and carry out the protection action.
The analog quantity change judging device based on the DCS comprises a memory and a processor, wherein computer readable instructions are stored in the memory, and when the processor executes the computer readable instructions, the analog quantity change judging method based on the DCS is realized.
The computer-readable medium stores a computer program, and is characterized in that when the computer program is executed by one or more processors, the method for judging the change of the analog quantity based on the DCS in the embodiment of the invention is realized.
Aiming at the prior art, the invention has the following beneficial effects:
the method adds the judgment of the change of the real-time value of the analog quantity on the basis of judging the process control end point by taking the instantaneous value of the analog quantity as the process control end point of the DCS, thereby ensuring that the effectiveness of the analog quantity as the end point judgment condition exists continuously, enabling the DCS to generate related protection actions in time when an abnormal condition occurs and avoiding the damage of related controlled equipment; whether the analog quantity changes or not and corresponding time judgment are introduced, judgment conditions in process control are increased, the process control is more reliable and safer, the load of manual participation and monitoring in the process control is reduced, and the automation degree is improved.
Drawings
FIG. 1 is a schematic flow chart of the DCS-based analog quantity variation judgment of the present invention;
FIG. 2 is a schematic process flow diagram of the ramming process in the embodiment of the present invention;
fig. 3 is a basic logic block diagram of a material-beating process in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The invention provides a DCS-based analog quantity change judgment method, which comprises the following steps:
step S1, starting, executing the main program, and synchronously starting the auxiliary program for judging the change of the analog quantity;
step S2, delaying, namely, arranging an instrument for judging the analog quantity on the target equipment, and setting delay time before judging the change of the analog quantity;
step S3, real-time value judgment, namely, data acquisition and recording and processing capacity judgment are carried out through the circulation of the DCS controller, and whether the analog quantity value recorded by the controller in the previous period is consistent with the analog quantity value recorded in the current period or not is compared;
step S4, the timer acts, the timer in the DCS controller is called to time, if the analog quantity changes, the timer is cleared; if the analog quantity is not changed, the timer normally times;
step S5, timing judgment, judging whether the accumulated time of the timer exceeds the set value, if yes, performing the protection action of the subsequent steps; if not overtime, not making protection action, but recording the analog quantity value of the period for subsequent program circulation to continuously judge whether the analog quantity value is changed;
step S6, protection action, corresponding protection action output;
step S7, resetting, if not, the program continuously generates protection action; if the operation is reset, the protection action is eliminated, the operation is consistent with the non-overtime action in the step S5, and after the analog quantity value of the period is recorded, the subsequent analog quantity value change judgment is continuously and circularly executed;
step S8, ending the analog quantity change judging program and the main program at the same time, if no protection action is generated and the operation process is normally ended, ending the analog quantity judging program; if the protection action is generated, the protection action execution is finished together with the main program.
As will be understood by those skilled in the art, an analog quantity refers to a continuously varying quantity or signal in a DCS system. Usually, the DCS system detects the on-site working conditions, such as temperature, pressure, flow, etc. of the instrument signals, or the customized variables used for auxiliary control in the DCS system. Fig. 1 shows a basic logic block diagram of a program algorithm, and the specific algorithm is described as follows.
(1) Beginning: the analog quantity change judgment is an auxiliary program of a certain main program, and the function of auxiliary judgment of abnormal working conditions is started, if the material beating program is the main program in the liquid material beating process, the analog quantity judgment program is the auxiliary program. The analog quantity judging program is started in synchronization with the main program.
(2) Time delay: the process control has certain hysteresis, for example, after the material filling to the storage tank is started, liquid can enter the storage tank after certain time of pipeline conveying along with the starting of the conveying equipment. The analog-quantity-determining meter is usually installed in a target device, such as a tank, for measuring the level of a liquid material in the tank, so that there is a certain hysteresis in the change of the level. Therefore, it is not reasonable to judge the change of the analog quantity immediately after the program starts, and a certain delay time needs to be set for the hysteresis, and the time needs to be estimated and set manually according to a specific use scene.
(3) And (3) real-time value judgment: the controller of the DCS has the capacity of acquiring, recording and judging data, the process is executed circularly, so that a circular execution period exists, and the period is usually 500 ms. The specific method for judging the change of the analog quantity in the step is to compare whether the analog quantity value recorded by the upper period controller is consistent with the analog quantity value recorded in the period.
However, the analog value has a certain floating, so that it is not a simple comparison between two values in this step. If the liquid level does not stably rise but constantly floats and rises under the action of inertia tension and the like in the process of conveying liquid materials to the storage tank, the numerical value measured by the liquid level meter is constantly floating. Even if the material beating process is abnormally interrupted due to equipment problems, the material in the storage tank is still kept for a long time, and the numerical value measured by the liquid level meter floats before the liquid level is still. In addition, the analog value measured by the instrument is transmitted through a standard 4-20mA current signal, and the measured value is possibly interfered by various environmental factors in the transmission process to cause the phenomenon of floating.
For the above reasons, it is not reasonable to simply compare whether the two values recorded in the previous cycle and the current cycle are consistent in this step. A dead band range is therefore set for the comparison values, i.e. the variation of the measured analog quantity values within the dead band range is considered to be invalid. The dead zone range can be adjusted as needed in a particular use scenario. The comparison process of this step also becomes to determine whether the value recorded in this period is smaller than the difference between the upper period value and the dead zone or larger than the sum of the upper period value and the dead zone. If the dead zone range is exceeded, the analog quantity is considered to be changed; if the dead zone range is not exceeded, it is assumed that there is no change in the analog quantity.
(4) The timer acts: in this program, a timer inside the DCS controller is called to perform timing. If the analog quantity changes, resetting the timer; if the analog quantity is not changed, the timer counts time normally. This timing process is typically in the form of seconds.
(5) Timing judgment: and judging the step by step, namely judging whether the accumulated time of the timer exceeds a set value. If overtime, carrying out protection action of the subsequent steps; if not overtime, the protection action is not carried out, but the analog value of the period is recorded for subsequent program circulation to continuously judge whether the analog value changes.
(6) Protection action: and outputting corresponding protection actions in the step. If an alarm is generated, or a stop command is sent to close the corresponding pump and valve equipment in the material conveying process.
(7) Resetting: in which step it is manually confirmed whether the program is reset. If not, the program continuously generates protection actions (alarming or sending a stop instruction and the like); if the reset is performed, the protection action is eliminated and is consistent with the action which is not overtime in the step 5. And after the analog quantity value of the period is recorded, continuously and circularly executing subsequent analog quantity value change judgment.
(8) And (4) ending: the analog quantity change judging program is ended simultaneously with the main program. If the protection action is not generated, the material beating process is normally finished, and the analog quantity judgment program is finished; if a protection action is generated, the protection action may end the main program together. The protection action content can be determined and set by specific use scenes.
(9) The following parameters can be openly set in the program:
a. in the time delay after the start, the time delay can be set according to a specific use scene.
b. The dead zone in the real-time value change judgment can be set according to a specific use scene.
c. In the timing judgment, the timeout time can be set according to a specific use scene.
d. The protection operation, the specific operation content, needs to be set according to the usage scenario.
Example two
As shown in fig. 2, which is a process flow chart of the material-beating process, after the material is unloaded from the tank wagon, the feeding valve and the material-beating pump are opened to determine whether the liquid level of the storage tank reaches a preset limit value, which is determined according to the specific height of the storage tank or the feeding requirement. And when the liquid level is greater than or equal to the preset limit value, closing the feeding valve and the material beating pump, and finishing the feeding process of the storage tank. The left side of fig. 3 is a logical block diagram of the process.
The right side of fig. 3 is a basic logic block diagram after the algorithm of the present invention is added. Different from the material beating process, when the equipment is started to beat, whether the liquid level value reaches the preset limit value or not is judged, and whether the liquid level value changes within the preset time is also judged in a delayed mode. If the time that the liquid level is unchanged exceeds the preset time, the state is considered as an abnormal working condition, an alarm is generated, and the step of closing the equipment is also carried out to finish the material beating process. Therefore, the recognition and the reminding of abnormal working conditions and the protection of the knockout equipment are realized.
After the starting equipment starts to knock materials, the materials need to be conveyed into the storage tank through a pipeline for a certain time. At this time, the liquid level in the storage tank begins to change, so that a certain delay time needs to be set to start the change judgment of the liquid level.
Whether the liquid level is unchanged or not is judged to be overtime or not, because the liquid level rises slowly in the normal material beating process. If the material is continuously driven into the storage tank under the condition that the volume of the storage tank is larger, the middle time of the liquid level is longer when the liquid level is changed from one value to another value, and therefore the corresponding protection action cannot be immediately executed when the liquid level is unchanged, but the duration time of the liquid level which is unchanged is judged, and if the duration time exceeds reasonable time, the situation is judged to be abnormal and the protection action is executed.
In the process of material beating, the liquid level continuously floats and rises. Even if the material beating is interrupted in abnormal conditions, the liquid level value cannot be immediately static due to factors such as inertia, tension and the like, and the liquid level value continuously floats for a period of time within a small range. And the current signal conveying the level value is susceptible to interference resulting in numerical floating. Therefore, a reasonable dead zone range is required, and the change of the liquid level in the dead zone is regarded as invalid change and is equivalent to no change.
In the process, the time for delaying to start liquid level change, the dead zone of liquid level change and the overtime time for keeping the liquid level unchanged can be correspondingly modified and set according to the actual material beating condition.
The judgment method based on the first embodiment can also be applied to related applications of judging the liquid material conveying by using a weighing device, or judging the temperature by using a thermometer and the like, and taking an analog quantity instantaneous value as a DCS (distributed control system) to judge the process control end point.
The present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program, when executed by one or more processors, implements the method for determining a change in analog quantity based on DCS. The computer readable storage medium may be a non-volatile computer readable storage medium, which may also be a volatile computer readable storage medium. The computer readable storage medium has stored therein instructions that, when executed on a computer, cause the computer to perform the steps of embodiment two of the process of delivering fluid material to a storage tank with a fluid level as a determination. Fluid is a flowable substance, which is a body that deforms continuously under any slight shear force.
Those skilled in the art will appreciate that the technical solution of the present invention, which is substantially or partly contributed by the prior art, or all or part of the technical solution, can be embodied in software stored in a storage medium, and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a removable hard disk, a read-only memory ROM, a random access memory RAM, a magnetic disk, or an optical disk. It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the above-described device may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A DCS-based analog quantity change judgment method is characterized by comprising the following steps:
step S1, starting, executing the main program, and synchronously starting the auxiliary program for judging the change of the analog quantity;
step S2, delaying, namely, arranging an instrument for judging the analog quantity on the target equipment, and setting delay time before judging the change of the analog quantity;
step S3, real-time value judgment, namely, data acquisition record and processing capacity judgment are carried out through the DCS controller in a circulating mode, whether the analog quantity value recorded by the upper period controller is consistent with the analog quantity value recorded in the period is compared, and if the analog quantity value is changed, the timer is reset;
step S4, the timer acts, the timer in the DCS controller is called to time, if the analog quantity changes, the timer is cleared; if the analog quantity is not changed, the timer normally times;
step S5, timing judgment, judging whether the accumulated time of the timer exceeds the set value, if yes, performing the protection action of the subsequent steps; if not overtime, not making protection action, but recording the analog quantity value of the period for subsequent program circulation to continuously judge whether the analog quantity value is changed;
step S6, protection action, corresponding protection action output;
step S7, resetting, if not, the program continuously generates protection action; if the operation is reset, the protection action is eliminated, the operation is consistent with the non-overtime action in the step S5, and after the analog quantity value of the period is recorded, the subsequent analog quantity value change judgment is continuously and circularly executed;
step S8, ending the analog quantity change judging program and the main program at the same time, if no protection action is generated and the operation process is normally ended, ending the analog quantity judgment; if the protection action is generated, the protection action execution is finished together with the main program.
2. The DCS-based analog quantity change judging method of claim 1, wherein in the step S3, a dead zone range is set to the comparison value, i.e., a change of the measured analog quantity value within the dead zone range is considered to be invalid; judging whether the value recorded in the period is smaller than the difference value between the upper period value and the dead zone or larger than the sum value of the upper period and the dead zone, and if the value is beyond the range of the dead zone, determining that the analog quantity has change; if the dead zone range is not exceeded, it is assumed that there is no change in the analog quantity.
3. The method of claim 2, wherein the delay time after the start, the size of the dead zone range in the real-time value change determination, the timeout time in the timing determination, and the specific contents of the protection operation are set according to a specific usage scenario.
4. The DCS-based analog quantity change judging method of claim 3, wherein in the step S1, the main program is a material beating program in a liquid material beating process.
5. The DCS-based analog quantity change judging method of claim 4, wherein in the step S6, the protection action comprises generating an alarm or issuing a stop command to close corresponding pump and valve devices during the material conveying process.
6. The DCS-based analog quantity change judging method of claim 5, further comprising:
after the materials are unloaded from the tank wagon, the feeding valve and the material beating pump are started, whether the liquid level of the storage tank reaches a preset limit value or not is judged, the limit value is determined according to the specific height of the storage tank or the feeding requirement, when the liquid level is larger than or equal to the preset limit value, the feeding valve and the material beating pump are closed, and the feeding process of the storage tank is finished.
7. The DCS-based analog quantity change judging method of claim 6, further comprising:
when the device is started and the material is beaten, whether the liquid level value reaches the preset limit value or not is judged, whether the liquid level value changes within the preset time or not is also judged in a delayed manner,
if the time that the liquid level is unchanged exceeds the preset time, the state is considered as an abnormal working condition, an alarm is generated, and the step of closing the equipment is also carried out to finish the material beating process.
8. The DCS-based analog quantity change judging method of claim 7, further comprising:
after starting the equipment to start the material beating, conveying the material into a storage tank through a pipeline for a certain time, wherein the liquid level of the storage tank begins to change at the moment, and setting a delay time to start the change judgment of the liquid level;
judge whether the liquid level is unchangeable overtime, continuously squeeze into the material in the storage tank under the great condition of storage tank volume, then the liquid level becomes another value intermediate time longer by one value, consequently can not carry out corresponding protection action at once when the liquid level is unchangeable, but judges the duration that the liquid level is unchangeable, if exceed reasonable time then judge for unusual operating mode and carry out the protection action.
9. A DCS-based analog quantity change judging device comprising a memory in which computer-readable instructions are stored and a processor which, when executing the computer-readable instructions, realizes the DCS-based analog quantity change judging method according to any one of claims 1 to 8.
10. A computer readable medium storing a computer program, wherein the computer program, when executed by one or more processors, implements the DCS-based analog quantity change determining method of any one of claims 1 to 8.
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