A method for solving the important event alarm problem in the control system of an air separation unit
By introducing multiple communication failure variables and logic modules into the DCS control system of the air separation device, repeated alarms for important events are realized, and the problem of alarm signal failure in the prior art is solved, ensuring the monitoring efforts of operators and production safety.
Patent Information
- Application Number
- CN202211617466.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-15
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2042-12-15
AI Technical Summary
In the existing DCS control system of the air-subdivided device, the alarm will fail after it is triggered once, and the alarm cannot be repeated, resulting in operators that may ignore important events and cause project losses.
By introducing multiple communication failure variables into the air separation device control system, and using the combination of logic modules and delay modules, the repeated triggering of alarm events is achieved. The specific steps include judging an alarm event, setting multiple communication failure variables, and ensuring that the alarm is triggered repeatedly within a specific time through the interaction between the logic module and the delay module.
Repeated alarms for important events in the air separation device control system are realized, avoiding the problem of alarm signal failure, ensuring that operators can pay attention to and deal with important events in a timely manner, and reducing the risk of project losses.
Smart Images
Figure CN115883344B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of air separation device control, in particular to a method for solving the problem of important event alarm in the control system of an air separation device. Background Art
[0002] With the rapid development of industrial modernization, DCS control systems and more advanced control systems are being used more and more widely. In recent years, frequent safety accidents in air separation units have made production companies pay more and more attention to the safety of the units. Designing a safety instrument system suitable for air separation units is an urgent problem that the industry needs to solve.
[0003] In the existing air separation unit DCS control system, all variables are triggered by rising and falling edges. This mechanism can only trigger an alarm once. When the alarm is triggered and the operator manually eliminates the alarm, the alarm will not be repeated. In actual use, operators are accustomed to eliminating the alarm before dealing with the problem when there is an alarm. In this way, during the production process, if the event corresponding to the alarm is not resolved, the alarm signal of the control system will become invalid, that is, the alarm will not be repeated. When this event is very important, it cannot serve as a reminder. At the operation site of the device, due to the heavy workload of the operation, any problems that arise are only handled after an alarm is issued. This will inevitably cause our operators to not monitor the event enough, which is easy to cause project losses. Summary of the invention
[0004] 1. Technical issues to be solved
[0005] In order to solve the above technical problems, the present invention provides a method for solving the important event alarm problem in an air separation device control system.
[0006] (II) Technical solution
[0007] In order to solve the above-mentioned technical problems and achieve the purpose of the invention, the present invention is implemented by the following technical solutions:
[0008] A method for solving the important event alarm problem in an air separation unit control system comprises the following steps:
[0009] S1: Determine whether an alarm event occurs. If so, control the first communication fault variable TXGZ1 to be ON, and go to step S2; otherwise, control the first communication fault variable to be OFF, and go to step S5;
[0010] S2: setting a second communication fault variable; inputting the value of the first communication fault variable into the first logic module, and the first logic module outputting the second communication fault variable;
[0011] S3: setting a third communication fault variable; inputting the value of the second communication fault variable into the second logic module, and the second logic module outputting the third communication fault variable;
[0012] S4: inputting the value of the third communication fault variable into a third logic module, the third logic module having the same structure as the second logic module;
[0013] S5: Input the value of the first communication fault variable into the fourth logic module and the fifth logic module at the same time, and output the second communication fault variable and the third communication fault variable respectively.
[0014] Furthermore, the first logic module includes a first delay module, a first rising edge trigger module and a first SEL module; the input-output relationship of the SEL module is: when the first input pin is ON, the value of the output pin is equal to the value of the third input pin, and when the first input pin is OFF, the value of the output pin is equal to the value of the second input pin.
[0015] Furthermore, the step S2 also includes: the first communication fault variable is delayed by the first delay module, if the first communication fault variable continues to be ON for more than the set time, the result ON is passed to the first rising edge trigger module, the result of the first rising edge trigger module is passed to the first input pin of the first SEL module, the second input pin and the output pin OUT of the first SEL module are the second communication fault variable, and the third input pin I3 of the first SEL module is input ON.
[0016] Furthermore, the second logic module includes a second delay module, a second rising edge trigger module, a second SEL module, and a third SEL module.
[0017] Further, the step S3 also includes: making an ON delay judgment on the second communication fault variable, delaying through the second delay module, and if the second communication fault variable continues to be ON for more than a set time, the result ON is transmitted to the second rising edge trigger module, the result of the second rising edge trigger module is transmitted to the first input pin of the second SEL module, the second input pin and the output pin of the second SEL module are the third communication fault variable, and the third input pin of the second SEL module is inputted ON;
[0018] At the same time, the output of the second rising edge trigger module is passed to the first input pin of the third SEL module, the second input pin and the output pin of the third SEL module are the second communication fault variables, and the third input pin of the third SEL module is input OFF.
[0019] Furthermore, the third logic module includes a third delay module, a third rising edge trigger module, a fourth SEL module and a fifth SEL module.
[0020] Further, the step S4 includes making an ON delay judgment on the third communication fault variable, and performing delay through the third delay module. If the third communication fault variable TXGZ3 continues to be ON for more than the set time, the result ON is transmitted to the third rising edge trigger module R_TRIG3, and the result of the third rising edge trigger module R_TRIG3 is transmitted to the first input pin I1 of the fourth SEL module SEL4, the second input pin I2 and the output pin OUT of the fourth SEL module SEL4 are the second communication fault variable TXGZ2, and the third input pin I3 of the fourth SEL module SEL4 is input ON;
[0021] At the same time, the output of the third rising edge trigger module R_TRIG3 is passed to the first input pin I1 of the fifth SEL module SEL5, the second input pin I2 and the output pin OUT of the fifth SEL module SEL5 are the third communication fault variable TXGZ3, and the third input pin I3 of the fifth SEL module SEL5 is input OFF.
[0022] Further, the fourth logic module includes a sixth SEL module; the fifth logic module includes a seventh SEL module;
[0023] Step S5 includes: the first communication fault variable is OFF, which is passed to the first input pins of the sixth SEL module and the seventh SEL module, the second input pins of the sixth SEL module and the seventh SEL module are OFF, the third input pin and the output pin of the sixth SEL module are the second communication fault variable, and the third input pin and the output pin of the seventh SEL module are the third communication fault variable.
[0024] The present invention also provides a device for solving the important event alarm problem in the air separation device control system, which comprises:
[0025] a fault signal generating module, which is used to control the value of the first communication fault variable according to whether an alarm event occurs;
[0026] A first logic module, which includes a first delay module, a first rising edge trigger module and a first SEL module connected in sequence;
[0027] A second logic module, which includes a second delay module, a second rising edge trigger module, a second SEL module and a third SEL module connected in sequence;
[0028] A third logic module, which includes a third delay module, a third rising edge trigger module, and a fourth SEL module and a fifth SEL module connected in sequence;
[0029] The fourth logic module includes a sixth SEL module, wherein the first input pin thereof inputs the first communication fault variable, the second input pin thereof inputs OFF, and the third input pin and the output pin thereof are connected to the second communication fault variable;
[0030] The fifth logic module includes a seventh SEL module, a first input pin of which inputs the first communication fault variable, a second input pin of which inputs OFF, and a third input pin and an output pin of which are connected to the third communication fault variable.
[0031] Further, the first communication fault variable is input into the first delay module, delayed by the first delay module, and further input into the first rising edge trigger module, the output of the first rising edge trigger module is connected to the first input pin of the first SEL module, the second input pin and the output pin of the first SEL module are the second communication fault variable, and the third input pin of the first SEL module is input ON;
[0032] The second communication fault variable is input into the second delay module, delayed by the second delay module, and further input into the second rising edge trigger module. The output of the second rising edge trigger module is simultaneously connected to the first input pin of the second SEL module and the first input pin of the third SEL module. The second input pin and output pin of the second SEL module are the third communication fault variable, and the third input pin of the second SEL module is inputted as ON; the second input pin and output pin of the third SEL module are the second communication fault variable, and the third input pin of the third SEL module is inputted as OFF;
[0033] Among them, the third communication fault variable is input into the third delay module, delayed by the third delay module, and further input into the third rising edge trigger module. The output of the third rising edge trigger module is simultaneously connected to the first input pin of the fourth SEL module and the first input pin of the fifth SEL module. The second input pin and output pin of the fourth SEL module are the second communication fault variable, and the third input pin of the fourth SEL module is input ON; the second input pin and output pin of the fifth SEL module are the third communication fault variable, and the third input pin of the fifth SEL module is input OFF.
[0034] (III) Beneficial effects
[0035] Compared with the prior art, the beneficial effects of the present invention are: achieving repeated alarms of important events in the air separation plant control system, avoiding the problem of the operator manually eliminating the alarm after the alarm is triggered, causing the alarm signal to become invalid. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0037] Figure 1 It is a flow chart of a method for solving the important event alarm problem in an air separation unit control system according to an embodiment of the present application;
[0038] Figure 2 is a schematic diagram of a first logic module according to an embodiment of the present application;
[0039] Figure 3 is a schematic diagram of a second logic module according to an embodiment of the present application;
[0040] Figure 4 is a schematic diagram of a third logic module according to an embodiment of the present application;
[0041] Figure 5 is a schematic diagram of a fourth logic module according to an embodiment of the present application;
[0042] Figure 6 This is a schematic diagram of a fifth logic module according to an embodiment of the present application. DETAILED DESCRIPTION
[0043] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
[0044] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.
[0045] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The drawings only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.
[0046] See also Figure 1 , a method for solving the important event alarm problem in an air separation unit control system, comprising the following steps:
[0047] S1: Determine whether an alarm event occurs. If so, control the first communication fault variable TXGZ1 to be ON and go to step S2. Otherwise, control the first communication fault variable TXGZ1 to be OFF and go to step S5.
[0048] S2: setting a second communication fault variable TXGZ2; inputting the value of the first communication fault variable TXGZ1 into the first logic module, and the first logic module outputs the second communication fault variable TXGZ2;
[0049] Furthermore, the first logic module includes a first delay module, a first rising edge trigger module R_TRIG1 and a first SEL module SEL1.
[0050] The input-output relationship of the delay module is: when the input I changes from OFF to ON, the output O changes to ON after a delay of a set time;
[0051] Optionally, the set time may be 3 seconds.
[0052] The input-output relationship of the rising edge trigger module is: when the input I changes from OFF to ON: the output O changes to ON and returns to OFF in the next cycle;
[0053] The input-output relationship of the SEL module is: when the first input pin I1 is ON, the value of the output pin OUT is equal to the value of the third input pin I3; when the first input pin I1 is OFF, the value of the output pin OUT is equal to the value of the second input pin I2.
[0054] Further, such as Figure 2 As shown, the first communication fault variable TXGZ1 is set to ON and delayed through the first delay module. If the first communication fault variable TXGZ1 continues to be ON for more than the set time, the result ON is passed to the first rising edge trigger module R_TRIG1. The result of the first rising edge trigger module R_TRIG1 is passed to the first input pin I1 of the first SEL module SEL1. The second input pin I2 and the output pin OUT of the first SEL module SEL1 are the second communication fault variable TXGZ2. The third input pin I3 of the first SEL module SEL1 is input ON.
[0055] S3: setting a third communication fault variable TXGZ3; inputting the value of the second communication fault variable TXGZ2 into the second logic module, and the second logic module outputs the third communication fault variable TXGZ3;
[0056] Furthermore, the second logic module includes a second delay module, a second rising edge trigger module R_TRIG2, a second SEL module SEL2, and a third SEL module SEL3.
[0057] Further, such as Figure 3 As shown, an ON delay judgment is made on the second communication fault variable TXGZ2, and a delay is performed through the second delay module. If the second communication fault variable TXGZ2 continues to be ON for more than the set time, the result ON is transmitted to the second rising edge trigger module R_TRIG2, and the result of the second rising edge trigger module R_TRIG2 is transmitted to the first input pin I1 of the second SEL module SEL2. The second input pin I2 and the output pin OUT of the second SEL module SEL2 are the third communication fault variable TXGZ3, and the third input pin I3 of the second SEL module SEL2 is input ON.
[0058] At the same time, the output of the second rising edge trigger module R_TRIG2 is passed to the first input pin I1 of the third SEL module SEL3, the second input pin I2 and the output pin OUT of the third SEL module SEL3 are the second communication fault variable TXGZ2, and the third input pin I3 of the third SEL module SEL3 is input OFF.
[0059] S4: inputting the value of the third communication fault variable TXGZ3 into the third logic module, the third logic module has the same structure as the second logic module;
[0060] The third logic module includes a third delay module, a third rising edge trigger module R_TRIG3, a fourth SEL module SEL4, and a fifth SEL module SEL5.
[0061] Further, such as Figure 4 As shown, an ON delay judgment is made on the third communication fault variable TXGZ3, and a delay is performed through the third delay module. If the third communication fault variable TXGZ3 continues to be ON for more than the set time, the result ON is transmitted to the third rising edge trigger module R_TRIG3, and the result of the third rising edge trigger module R_TRIG3 is transmitted to the first input pin I1 of the fourth SEL module SEL4, the second input pin I2 and the output pin OUT of the fourth SEL module SEL4 are the second communication fault variable TXGZ2, and the third input pin I3 of the fourth SEL module SEL4 is input ON.
[0062] At the same time, the output of the third rising edge trigger module R_TRIG3 is passed to the first input pin I1 of the fifth SEL module SEL5, the second input pin I2 and the output pin OUT of the fifth SEL module SEL5 are the third communication fault variable TXGZ3, and the third input pin I3 of the fifth SEL module SEL5 is input OFF.
[0063] S5: Input the value of the first communication fault variable TXGZ1 into the fourth logic module and the fifth logic module at the same time, and output the second communication fault variable TXGZ2 and the third communication fault variable TXGZ3 respectively.
[0064] The fourth logic module includes a sixth SEL module SEL6; the fifth logic module includes a seventh SEL module SEL7.
[0065] like Figure 5-6 As shown, the first communication fault variable TXGZ1 is OFF, which is passed to the first input pin I1 of the sixth SEL module SEL6 and the seventh SEL module SEL7, the second input pin I2 of the sixth SEL module SEL6 and the seventh SEL module SEL7 is OFF, the third input pin I3 and the output pin of the sixth SEL module SEL6 are the second communication fault variable TXGZ2, and the third input pin I3 and the output pin of the seventh SEL module SEL7 are the third communication fault variable TXGZ3.
[0066] Therefore, when the device is in normal condition, the output values of the sixth SEL module SEL6 and the seventh SEL module SEL7 are OFF, which can avoid false alarms when the device is in normal condition.
[0067] According to the above steps, repeated alarm can be realized. When the alarm signal is not eliminated, that is, the first communication fault variable TXGZ1 is always ON, the second communication fault variable TXGZ2 and the third communication fault variable TXGZ3 are alternately turned ON within the specified repeated alarm time to repeatedly trigger the alarm event.
[0068] The second communication fault variable TXGZ2 and the third communication fault variable TXGZ3 are communication fault variables, which are variables added to realize cyclic alarm. The trigger mark of the alarm is rising edge trigger.
[0069] In this way, we get a repeated alarm. When the alarm source TXGZ1 is always ON, we can use the two variables TXGZ2 and TXGZ3 to alternately turn ON within the specified repeated alarm time to repeatedly trigger the alarm event. It must be emphasized that the first communication fault variable TXGZ1, the second communication fault variable TXGZ2, and the third communication fault variable TXGZ3 are all for the same event, and any alarm among them is pointing to the same event.
[0070] The method is applied in a centralized control system such as DCS or PLC, and is applicable to centralized control systems of different manufacturers and models.
[0071] In this embodiment, through the combination of logic modules and the alternating control of three variables, repeated alarms of important events in the air separation unit control system are achieved, avoiding the problem of the alarm signal being invalid due to the operator manually eliminating the alarm after the alarm is triggered.
[0072] The embodiment of the present invention further provides a device for solving the important event alarm problem in the air separation device control system, comprising:
[0073] A fault signal generating module, which is used to control the value of the first communication fault variable TXGZ1 according to whether an alarm event occurs;
[0074] The first logic module includes a first delay module, a first rising edge trigger module R_TRIG1 and a first SEL module SEL1 connected in sequence; wherein, the first communication fault variable is input into the first delay module, delayed by the first delay module, and further input into the first rising edge trigger module R_TRIG1, the output of the first rising edge trigger module R_TRIG1 is connected to the first input pin of the first SEL module SEL1, the second input pin I2 of the first SEL module SEL1 and the output pin OUT are the second communication fault variable TXGZ2, and the third input pin I3 of the first SEL module SEL1 is input ON.
[0075] The second logic module includes a second delay module, a second rising edge trigger module R_TRIG2, a second SEL module SEL2 and a third SEL module SEL3 connected in sequence. The second communication fault variable is input into the second delay module, delayed by the second delay module, and further input into the second rising edge trigger module R_TRIG2. The output of the second rising edge trigger module R_TRIG2 is simultaneously connected to the first input pin of the second SEL module SEL2 and the first input pin of the third SEL module SEL3. The second input pin I2 and the output pin OUT of the second SEL module SEL2 are the third communication fault variable TXGZ3. The third input pin I3 of the second SEL module SEL2 is input with ON. The second input pin I2 and the output pin OUT of the third SEL module SEL3 are the second communication fault variable TXGZ2. The third input pin I3 of the third SEL module SEL3 is input with OFF.
[0076] The third logic module includes a third delay module, a third rising edge trigger module R_TRIG3, a fourth SEL module SEL4 and a fifth SEL module SEL5 connected in sequence. The third communication fault variable is input into the third delay module, delayed by the third delay module, and further input into the third rising edge trigger module R_TRIG3. The output of the third rising edge trigger module R_TRIG3 is simultaneously connected to the first input pin of the fourth SEL module SEL4 and the first input pin of the fifth SEL module SEL5. The second input pin I2 and the output pin OUT of the fourth SEL module SEL4 are the second communication fault variable TXGZ2, and the third input pin I3 of the fourth SEL module SEL4 is input as ON; the second input pin I2 and the output pin OUT of the fifth SEL module SEL5 are the third communication fault variable TXGZ3, and the third input pin I3 of the fifth SEL module SEL5 is input as OFF.
[0077] The fourth logic module includes a sixth SEL module SEL6, whose first input pin inputs the first communication fault variable TXGZ1, the second input pin inputs OFF, and the third input pin and the output pin are connected to the second communication fault variable TXGZ2.
[0078] The fifth logic module includes a seventh SEL module SEL7, a first input pin of which inputs the first communication fault variable TXGZ1, a second input pin of which inputs OFF, and a third input pin and an output pin of which are connected to the third communication fault variable TXGZ3.
[0079] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.
Claims
1. A method for solving the important event alarm problem in the air separation unit control system. It is characterized in that The steps include: S1: Determine whether an alarm event occurs. If so, control the first communication fault variable to be ON and go to step S2. Otherwise, control the first communication fault variable to be OFF and go to step S5; set the second communication fault variable; set the third communication fault variable; S2: inputting the value of the first communication fault variable into the first logic module, and the first logic module outputs the second communication fault variable; The first logic module includes a first delay module, a first rising edge trigger module and a first SEL module; when the first input pin of the first SEL module is ON, the value of the output pin is equal to the value of the third input pin, and when the first input pin is OFF, the value of the output pin is equal to the value of the second input pin, wherein the second input pin and the output pin are second communication fault variables, and the third input pin is ON; S3: inputting the value of the second communication fault variable into the second logic module, and the second logic module outputs a third communication fault variable; The second logic module includes a second delay module, a second rising edge trigger module, a second SEL module, and a third SEL module. The second input pin and the output pin of the second SEL module are the third communication fault variable, and the third input pin is inputted as ON. The second input pin and the output pin of the third SEL module are the second communication fault variable, and the third input pin is inputted as OFF. S4: inputting the value of the third communication fault variable into a third logic module, the third logic module having the same structure as the second logic module; S5: Input the value of the first communication fault variable into the fourth logic module and the fifth logic module at the same time, and output the second communication fault variable and the third communication fault variable respectively.
2. The method for solving the important event alarm problem in the air separation unit control system according to claim 1, It is characterized in that The step S2 also includes: the first communication fault variable is delayed by the first delay module. If the first communication fault variable continues to be ON for more than the set time, the result ON is transmitted to the first rising edge trigger module, and the result of the first rising edge trigger module is transmitted to the first input pin of the first SEL module.
3. The method for solving the important event alarm problem in the air separation unit control system according to claim 2, It is characterized in that The step S3 further includes: performing an ON delay judgment on the second communication fault variable, performing a delay through a second delay module, and if the second communication fault variable continues to be ON for more than a set time, transmitting the result ON to the second rising edge trigger module, and transmitting the result of the second rising edge trigger module to the first input pin of the second SEL module; At the same time, the output of the second rising edge trigger module is transmitted to the first input pin of the third SEL module.
4. The method for solving the important event alarm problem in the air separation unit control system according to claim 3, It is characterized in that The third logic module includes a third delay module, a third rising edge trigger module, a fourth SEL module and a fifth SEL module.
5. The method for solving the important event alarm problem in the air separation unit control system according to claim 1, It is characterized in that The step S4 includes making an ON delay judgment on the third communication fault variable, and performing delay through the third delay module. If the third communication fault variable TXGZ3 continues to be ON for more than the set time, the result ON is transmitted to the third rising edge trigger module R_TRIG3, and the result of the third rising edge trigger module R_TRIG3 is transmitted to the first input pin I1 of the fourth SEL module SEL4, the second input pin I2 and the output pin OUT of the fourth SEL module SEL4 are the second communication fault variable TXGZ2, and the third input pin I3 of the fourth SEL module SEL4 is input ON; At the same time, the output of the third rising edge trigger module R_TRIG3 is passed to the first input pin I1 of the fifth SEL module SEL5, the second input pin I2 and the output pin OUT of the fifth SEL module SEL5 are the third communication fault variable TXGZ3, and the third input pin I3 of the fifth SEL module SEL5 is input OFF.
6. The method for solving the important event alarm problem in the air separation unit control system according to claim 1, It is characterized in that The fourth logic module includes a sixth SEL module; the fifth logic module includes a seventh SEL module; Step S5 includes: the first communication fault variable is OFF, which is passed to the first input pins of the sixth SEL module and the seventh SEL module, the second input pins of the sixth SEL module and the seventh SEL module are OFF, the third input pin and the output pin of the sixth SEL module are the second communication fault variable, and the third input pin and the output pin of the seventh SEL module are the third communication fault variable.
7. A device for solving the problem of important event alarm in the control system of an air separation unit, include: a fault signal generating module, which is used to control the value of the first communication fault variable according to whether an alarm event occurs; A first logic module, which includes a first delay module, a first rising edge trigger module and a first SEL module connected in sequence; The input and output of the first logic module are the first communication fault variable and the second communication fault variable respectively, when the first input pin of the first SEL module is ON, the value of the output pin is equal to the value of the third input pin, when the first input pin is OFF, the value of the output pin is equal to the value of the second input pin, wherein the second input pin and the output pin are the second communication fault variable, and the third input pin is ON; A second logic module, which includes a second delay module, a second rising edge trigger module, a second SEL module and a third SEL module connected in sequence; The input of the second logic module is the second communication fault variable, the second input pin and the output pin of the second SEL module are the third communication fault variable, the third input pin is inputted as ON, the second input pin and the output pin of the third SEL module are the second communication fault variable, and the third input pin is inputted as OFF; A third logic module, which includes a third delay module, a third rising edge trigger module, and a fourth SEL module and a fifth SEL module connected in sequence; The fourth logic module includes a sixth SEL module, wherein the first input pin thereof inputs the first communication fault variable, the second input pin thereof inputs OFF, and the third input pin and the output pin thereof are connected to the second communication fault variable; The fifth logic module includes a seventh SEL module, a first input pin of which inputs the first communication fault variable, a second input pin of which inputs OFF, and a third input pin and an output pin of which are connected to the third communication fault variable.
8. The device for solving the important event alarm problem in the air separation device control system according to claim 7, It is characterized in that The first communication fault variable is input into the first delay module, delayed by the first delay module, and further input into the first rising edge trigger module. The output of the first rising edge trigger module is connected to the first input pin of the first SEL module. The second input pin and the output pin of the first SEL module are the second communication fault variable. The third input pin of the first SEL module is inputted as ON. The second communication fault variable is input into the second delay module, delayed by the second delay module, and further input into the second rising edge trigger module. The output of the second rising edge trigger module is simultaneously connected to the first input pin of the second SEL module and the first input pin of the third SEL module. The second input pin and output pin of the second SEL module are the third communication fault variable, and the third input pin of the second SEL module is inputted as ON; the second input pin and output pin of the third SEL module are the second communication fault variable, and the third input pin of the third SEL module is inputted as OFF; Among them, the third communication fault variable is input into the third delay module, delayed by the third delay module, and further input into the third rising edge trigger module. The output of the third rising edge trigger module is simultaneously connected to the first input pin of the fourth SEL module and the first input pin of the fifth SEL module. The second input pin and output pin of the fourth SEL module are the second communication fault variable, and the third input pin of the fourth SEL module is input ON; the second input pin and output pin of the fifth SEL module are the third communication fault variable, and the third input pin of the fifth SEL module is input OFF.
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