CN113323856B

CN113323856B - EVT-based combinational logic control switch signal method

Info

Publication number: CN113323856B
Application number: CN202110668215.0A
Authority: CN
Inventors: 李平
Original assignee: Changzhou Weishuo Automation Technology Co ltd
Current assignee: Changzhou Weishuo Automation Technology Co ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2022-09-20
Anticipated expiration: 2041-06-16
Also published as: CN113323856A

Abstract

The invention discloses a method for controlling a switch signal based on EVT combinational logic, which comprises T parameter setting, AL parameter setting and IS parameter setting, wherein the T parameter setting, the AL parameter setting and the IS parameter setting are used as one of EVT condition signals to carry out combinational logic operation, so that the EVT IS controlled in action. Compared with the common relay switch control method, the relay switch control method has more control conditions and more various control modes. Meanwhile, the control conditions can be set, so that the same conditions are flexible and changeable, the system is not as rigid as the traditional control mode, and the working requirements under various complex conditions can be better met. And through the mode of combinatorial logic, make control more accurate, rethread delay return difference wait debugging parameter's joining makes relay work more stable safety, has significantly reduced the condition that causes the damage to equipment, has prolonged equipment life.

Description

EVT-based combinational logic control switch signal method

Technical Field

The invention relates to the field of EVT logic control switch signals, in particular to a method for controlling switch signals based on EVT combination logic.

Background

A flexible control method for a relay of environmental test equipment is characterized in that a relay control mode comprises the steps of selecting a relay mode according to a control variable, selecting the control variable mode, a logic combination mode and a composite control variable mode according to the relay, acquiring or calculating values of action parameters required by the relay action of the environmental test equipment, wherein the values of the action parameters are embodied in a binary logic form, controlling the corresponding relay action according to the control variable, and correspondingly starting or stopping an action unit connected with the relay. Traditional temperature controller is through sampling, the instant monitoring to ambient temperature is automatic through temperature sensor, and control circuit starts when ambient temperature reaches the control set value, and traditional cooling function during operation can appear cooling switch and open untimely to and situations such as the frequent start of switch can lead to temperature control unstable, and easily causes compressor damage etc. when being controlled equipment cooling system uses the compressor.

Disclosure of Invention

In order to solve the problems, an EVT combinational logic based switching signal control method is provided.

The invention is realized by the following technical scheme:

a method for controlling a switch signal based on EVT combinational logic comprises T parameter setting, AL parameter setting and IS parameter setting, wherein the EVT IS subjected to action control by performing combinational logic operation on the T parameter setting, the AL parameter setting and the IS parameter setting as one of EVT condition signals; wherein the content of the first and second substances,

the T parameter is set as: judging the switching signal according to a T parameter, wherein the T parameter comprises the current temperature, the set temperature, the temperature range and the temperature deviation;

the AL parameters are set as: controlling an alarm signal according to two alarm modes of temperature and humidity;

the IS parameters are set as: the switching signal is controlled according to two objects of temperature and humidity.

Further, the T parameter setting specifically is: and judging the action of the switching signal according to the current temperature, the set temperature, the low temperature range, the medium temperature range, the high temperature deviation, the low temperature deviation and the return difference.

Further, the specific determination step of the T parameter setting is:

s101, judging the range of the current temperature, wherein the total range is four ranges: the current temperature < range low, range low is equal to or less than the current temperature < range medium, range medium is equal to or less than the current temperature < range high, current temperature > range high;

s102, when the current temperature is lower than the range, the switch is kept closed;

s103, when the current temperature is larger than or equal to the range low and smaller than the range, the current temperature is larger than or equal to the set temperature minus the temperature low deviation, the switch is turned on, the current temperature is smaller than the set temperature minus the temperature low deviation, and when a set return difference exists, the return difference is subtracted, and the switch is turned off;

s104, when the current temperature is greater than or equal to the range and less than the range height, the current temperature is greater than or equal to the set temperature plus the temperature height deviation, the switch is turned on, the current temperature is less than the set temperature plus the temperature height deviation, and when a set return difference exists, the return difference is subtracted, and the switch is turned off;

and S105, when the current temperature is higher than the range, keeping the switch off.

Further, the AL parameter sets a common temperature alarm mode and humidity alarm mode, and the temperature alarm mode and the humidity alarm mode respectively have six types, namely, a positive indication value upper limit, a positive indication value lower limit, a positive deviation upper limit, a positive deviation lower limit, a reverse deviation upper limit, a reverse deviation lower limit, an upper and lower limit deviation range, a reverse indication value upper limit, and a reverse indication value lower limit, wherein the positive and reverse indicates an output direction standby action, each type is divided into no indication and an indication, the indication indicates that the range is out of action for the first time, and the range is out of action for the second time.

Further, the specific judgment step for setting the AL parameter is as follows:

s201, when the alarm signal is in an OFF state, judging;

s2011, when the value of the selected variable does not reach the alarm condition, keeping the OFF state;

s2012, when the value of the selected variable reaches the alarm condition, the alarm signal acts and turns into ON state;

s202, when the alarm signal is in an ON state, judging;

s2021, when the variable value meets the alarm condition, keeping the ON state;

s2022, when the value of the selected variable is changed to be not in accordance with the alarm condition, the alarm signal is changed to OFF state.

Further, in step S2022, when the alarm signal changes from the ON state to the OFF state, the alarm condition is one of a set value plus or minus a return difference.

Further, the IS parameter setting includes a temperature object and a humidity object, the temperature object and the humidity object respectively have six variables of a set value, a display value, a target value, a slope, a heating output and a cooling output, and are controlled by a switch corresponding time parameter through an action direction, a range height, a range low, a time delay, a return difference and a switch sequence.

Further, the specific determination step of IS parameter setting IS:

s301, selecting an action direction: when the variable selects the slope, the action direction is ascending or descending;

s302, when the range is selected, judging that the variable is:

s3021, when the selected variable value is always smaller than the low range, the switch is normally closed;

s3022, when the variable value is changed from the value smaller than the range to the value larger than or equal to the range, if the variable value is delayed, the switch is turned on after the delay time, and if the variable value is not delayed, the switch is directly turned on;

s3023, when the value of the selected variable is changed from within the range to be less than or equal to the range low, the switch is kept closed again, and when the return difference is set, the return difference is subtracted when the value of the variable is lower than the range low, and the switch is closed;

s3024, when the value of the selected variable is changed from the range to be larger than or equal to the range height, the switch is kept closed again, and when the set return difference exists, the return difference is added to the value of the variable which is larger than or equal to the range height, and the switch is closed;

s3025, when the variable value is changed from being larger than the range height to being smaller than or equal to the range height, if the variable value is delayed, the switch is turned on after the delay time, and if the variable value is not delayed, the switch is directly turned on;

s3026, when the variable value is always larger than the range height, the switch is normally closed;

s303, when the selection range is out, judging the variable:

s3031, when the value of the selected variable is always smaller than the range low, the switch keeps the opening state;

s3032, when the value of the selected variable is changed from being less than the range low to being more than or equal to the range low, the switch is closed, and if the return difference is set, the value of the variable is required to be more than or equal to the range low and the return difference switch is closed;

s3033, when the variable value is changed from the range to be larger than or equal to the range height, if the variable value is delayed, the switch is opened after the delay time, and if the variable value is not delayed, the switch is directly opened;

s3034, when the value of the selected variable is changed from the range to be less than or equal to the low range, if the value is delayed, the switch is turned on after the delay time, and if the value is not delayed, the switch is directly turned on;

s3035, when the value of the selected variable is changed from being larger than the range height to being smaller than or equal to the range height, the switch is closed, and if the return difference is set, the value of the selected variable is smaller than or equal to the range height and the return difference is subtracted, the switch is closed;

s3036, when the selected variable value is always larger than the range height, the switch is normally opened.

Further, the IS parameter setting IS that when the setting of first-to-second switch and corresponding time IS available, the switch IS changed from the on-state to be alternately changed by the corresponding time when the action IS performed.

The invention has the beneficial effects that:

(1) compared with the common relay switch control method, the method has more control conditions and more various control modes;

(2) the invention can set the control conditions, so that the same condition is flexible and changeable, the control method is not as rigid as the traditional control method, and the working requirements under various complex conditions can be better met;

(3) the invention makes the control more precise by the way of combinational logic;

(4) the invention adds debugging parameters such as delay return difference and the like, so that the relay works more stably and safely, the condition of damaging equipment is greatly reduced, and the service life of the equipment is prolonged.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic flow chart of a T parameter method proposed in embodiment 1 of the present invention;

fig. 2 is a schematic flow chart of an AL parameter method according to embodiment 1 of the present invention;

fig. 3 IS a schematic flow chart of IS parameter method according to embodiment 1 of the present invention;

FIG. 4 is a diagram of the operation of adding and subtracting the return difference when the ON state is changed to the OFF state according to embodiment 2 of the present invention;

fig. 5 IS a diagram of IS setup proposed in embodiment 2 of the present invention;

fig. 6 is a diagram of INNER SIGNAL action configuration 1 according to embodiment 2 of the present invention;

fig. 7 is a diagram of INNER SIGNAL action configuration 2 according to embodiment 2 of the present invention;

fig. 8 is a diagram of INNER SIGNAL action configuration 3 according to embodiment 2 of the present invention;

fig. 9 is a diagram of INNER SIGNAL action configuration 4 according to embodiment 2 of the present invention;

fig. 10 is a diagram of an EVT arrangement proposed by embodiment 2 of the present invention;

fig. 11 is a view showing the EVT1 and EVT2 according to embodiment 2 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and the accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limiting the present invention.

Example 1

As shown in fig. 1, the present embodiment provides a method for controlling a switch signal based on EVT combinational logic, which includes setting T parameters, setting AL parameters, and setting IS parameters, as shown in fig. 1, and performs operation control on an EVT by performing combinational logic operation on the setting T parameters, the setting AL parameters, and the setting IS parameters as one of EVT condition signals; wherein the content of the first and second substances,

Further, as shown in fig. 1, the specific determining step of the T parameter setting is:

s103, when the current temperature is larger than or equal to the range low and smaller than the range, the current temperature is larger than or equal to the set temperature minus the low temperature deviation, the switch is turned on, the current temperature is smaller than the set temperature minus the low temperature deviation (if return difference is set, the return difference needs to be subtracted), and the switch is turned off;

s104, when the current temperature is greater than or equal to the range and is less than the range height, the current temperature is greater than or equal to the set temperature plus the high temperature deviation, the switch is turned on, the current temperature is less than the set temperature plus the high temperature deviation (if the return difference is set, the return difference needs to be subtracted), and the switch is turned off;

Further, as shown in fig. 2, the specific determining step of AL parameter setting is:

s201, when the alarm signal is in an OFF state, judging;

s202, when the alarm signal is in an ON state, judging;

s2021, when the variable value meets the alarm condition, keeping the ON state;

Further, as shown in fig. 3, the specific determination step of IS parameter setting IS:

s301, selecting an action direction: in-range or out-of-range (when the variable selects a slope, the direction of motion is up or down);

s302, when the range is selected, judging whether the variable:

s3023, when the value of the selected variable is changed from the range to be less than or equal to the range low, the switch is kept closed again, and when the return difference is set, the return difference is reduced when the value of the selected variable is less than the range low, and the switch is closed;

s3024, when the value of the selected variable is changed from the range to be larger than or equal to the range height, the switch is kept closed again, and when the set return difference exists, the return difference is added to the value of the variable, which is larger than or equal to the range height, and the switch is closed;

s303, when the selection range is out, judging the variable:

s3032, when the value of the selected variable is changed from being less than the range low to being more than or equal to the range low, the switch is closed, and if the return difference is set, the value of the selected variable is required to be more than or equal to the range low and the return difference switch is closed;

Example 2

On the basis of embodiment 1, the present embodiment further provides an EVT combinational logic based control switch signal method applied to a control instrument for controlling cooling related operations according to changes of temperature and humidity related variables, and suitable for devices such as light industry machinery, ovens, experimental devices, heating/cooling devices, and the like.

The method uses the following parameters, wherein T setting, AL setting and IS setting can work independently or can be used as one of condition signals of the EVT to carry out combinational logic operation so as to control the action of the EVT:

1. t is set: the operation of the switch signal is judged according to the temperature value, and the following parameters of current temperature, set temperature, low temperature range, medium temperature range, high temperature deviation, low temperature deviation and return difference are used.

And (3) judging the flow: judging the range of the current temperature, wherein the range is four ranges: the current temperature is lower than the range, lower than or equal to the current temperature, higher than the range, and higher than the current temperature.

When the current temperature is less than the range low, the switch remains closed.

When the current temperature is larger than or equal to the range low and smaller than the range, the current temperature is larger than or equal to the set temperature minus the low temperature deviation, the switch is turned on, the current temperature is smaller than the set temperature minus the low temperature deviation (if the return difference is set, the return difference needs to be subtracted), and the switch is turned off.

When the current temperature is greater than or equal to the range and is less than the range height, the current temperature is greater than or equal to the set temperature plus the high temperature deviation, the switch is turned on, the current temperature is less than the set temperature plus the high temperature deviation (if the return difference is set, the return difference needs to be subtracted), and the switch is turned off.

When the current temperature is greater than the range high, the switch remains closed.

2. Setting AL: the alarm device is provided with two alarm modes of temperature and humidity, wherein each alarm mode is respectively provided with six types including an upper indicated value limit (positive), a lower indicated value limit (positive), an upper deviation limit (positive), a lower deviation limit (positive), an upper deviation limit (inverse), a lower deviation limit (inverse), an outer upper limit deviation range, an inner upper limit deviation range, an upper indicated value limit (inverse) and a lower indicated value limit (inverse), wherein the positive and inverse indicate the standby action of the output direction, and each type is divided into two situations of no indication and indication (indication means that the alarm device is out of range for the first time and does not act, and the alarm device is out of range for the second time).

And (3) judging the flow:

selecting objects and variables

When the alarm signal is in OFF state

Keeping OFF state when the selected variable value does not reach the alarm condition.

When the value of the selected variable reaches the alarm condition, the alarm signal acts and turns into ON state.

When the alarm signal is in ON state

Keeping ON state when the selected variable value meets the alarm condition.

② when the selected variable value becomes out of compliance with the alarm condition, the alarm signal becomes OFF state.

Note: when the alarm signal changes from the ON state to the OFF state, the alarm condition is a set value plus or minus a back difference. The alarm of the upper and lower limits of temperature and humidity can set time delay.

The operation forms of addition and subtraction of the return difference when the ON state is changed to the OFF state are shown in table 1 and fig. 4.

TABLE 1 addition/subtraction operation form table of return difference when ON state is changed to OFF state

3. IS setting:

the objects are temperature and humidity, respectively, and each object has a set value, a display value,

Target value, slope, heating output and cooling output. The control is carried out by preset parameters such as action direction, range height, range low, time delay, return difference and switching sequence according to corresponding time of the switch.

The control flow comprises the following steps:

selecting objects and variables

Selecting an action direction: in-range or out-of-range (when the variable selects a slope, the direction of motion is up or down)

When selected within the range:

when the value of the selected variable is always smaller than the range, the switch is normally closed.

And secondly, when the selected variable value is changed from the value smaller than the range to the value larger than or equal to the range, if the value is delayed, the switch is turned on after the delay time, and if the value is not delayed, the switch is directly turned on.

And when the value of the selected variable is changed from the range to be less than or equal to the range low, the switch is kept closed again, and if the return difference is set, the value of the selected variable is lower than the range low, and the return difference is subtracted, and then the switch is closed.

When the value of the selected variable is changed from the range to be larger than or equal to the range height, the switch is kept closed again, and if the return difference is set, the switch is closed after the value of the selected variable is larger than or equal to the range height and the return difference is added.

When the selected variable value is changed from greater than range height to less than or equal to range height, if it is delayed, the switch is turned on after the delay time, if it is not, it is directly turned on.

When the value of the selected variable is always larger than the range height, the switch is normally closed.

When out of range is selected:

when the value of the selected variable is always smaller than the range, the switch keeps on state.

And secondly, when the value of the selected variable is changed from the value smaller than the range low to the value larger than or equal to the range low, the switch is closed, and if the return difference is set, the switch is closed only when the value of the selected variable is larger than or equal to the range low and the return difference is added.

And when the value of the selected variable is changed from the range to be larger than or equal to the range height, if the value is delayed, the switch is turned on after the delay time, and if the value is not delayed, the switch is directly turned on.

When the value of the selected variable is changed from the range to be less than or equal to the low range, if the value is delayed, the switch is turned on after the delay time, and if the value is not delayed, the switch is directly turned on.

When the selected variable value is changed from greater than range height to less than or equal to range height, the switch is closed, if the return difference is set, the switch is closed only when the variable value is less than or equal to range height minus return difference.

And sixthly, when the value of the selected variable is always larger than the range height, the switch is normally opened.

Note: if the switch is switched on first and then switched off or switched off first and then switched on and corresponding time is set, the switch is changed from the on-state to the on-state and the corresponding time is changed alternately when the switch is operated. (for example: if the display value is set as in FIG. 5, the signal is turned on for 10s and turned off for 10s alternately within 10-80 ℃), the actions are judged INNER SIGNAL according to the set values as in FIG. 6, FIG. 7, FIG. 8 and FIG. 9.

4. EVT settings:

referring to fig. 10, the 16 signals of this version EVT are divided into 8 pages, each page has 2 events, each event is composed of 4 signal blocks, and the signals available are as follows:

TS 1-TS 8: 8 paths of time mark signals;

4 paths of alarm signals AL 1-AL 4;

IS 1-IS 16: 16 paths of IS signals;

EVT 1-EVT 16: 16 EVT signals;

T1-T7: 7 paths of T signals;

X1-X8: 8 paths of fault signals;

FIX signal point: the value operation signal point is appointed, the negation effect is a program operation signal point, and the configuration can be carried out in the EVT to realize simple logic. For some output signals that can only be performed individually in a fixed value or program, FIX signal points provide the best help.

Where string 1 controls the logical relationship between condition signal 1 and condition signal 2, and string 3 controls the logical relationship between condition signal 3 and condition signal 4, and string 2 is more specific, controlling the logical relationship between the upper half (i.e., condition 1 and condition 2 are one entity) and the lower half (i.e., condition 3 and condition 4 are one entity).

The specific working process is as follows:

set up four signal conditions.

And secondly, setting the normally open and normally closed conditions of the four signals respectively, wherein the four signals are set to be normally open (positive), namely, the four signals are used when the selected condition is set to be ON, and the four signals are set to be normally closed (negative), namely, the four signals are used when the selected condition is set to be OFF.

And thirdly, setting the relation between the signals, wherein the series is series connection, and the parallel connection is parallel connection. When the relationship between the signals is set to "string," then the EVT signals need to be satisfied for both signals to be ON. When the relationship between the signals is set to "and", then only one of the signals needs to satisfy the condition EVT signal to be ON.

And fourthly, setting whether the signal needs to be delayed or not, and setting 0 time without delay.

The next signal is set by cycling the above steps, and the EVT set in the front can be used as one of the condition signals of the EVT set in the rear.

As shown in fig. 11, EVT1 and EVT2 are provided separately:

first, the EVT1 IS judged to be ON, and when the T1 signal IS OFF or the IS1 signal IS OFF and both the AL1 signal and the RUN signal are ON at the same time, the EVT1 IS ON after a delay of 20S.

Next, it IS judged that the EVT2 IS turned ON when the EVT1 signal and the IS2 signal are simultaneously turned ON, the EVT2 IS turned ON, and when either of the signals IS not ON, the EVT2 IS turned OFF after a time delay of 60S.

Note: the condition signal is normally open by default when the condition signal selects 0: TURE.

The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A method for controlling a switch signal based on EVT combinational logic IS characterized by comprising T parameter setting, AL parameter setting and IS parameter setting, wherein the EVT IS subjected to action control by performing combinational logic operation on the T parameter setting, the AL parameter setting and the IS parameter setting as one of EVT condition signals; the IS parameter setting comprises a temperature object and a humidity object, wherein the temperature object and the humidity object respectively have six variables of a set value, a display value, a target value, a slope, heating output and cooling output, and are controlled by corresponding time parameters of a switch through an action direction, a range height, a range low, time delay, a return difference and a switching sequence;

the IS parameters are set as: controlling a switching signal according to two objects of temperature and humidity;

the specific judging step of the IS parameter setting IS as follows:

s302, when the range is selected, judging whether the variable:

s303, when the selection range is out, judging the variable:

2. The method for controlling switching signals based on EVT combinational logic according to claim 1, wherein said T parameter settings are specifically: and judging the action of the switching signal according to the current temperature, the set temperature, the low temperature range, the medium temperature range, the high temperature deviation, the low temperature deviation and the return difference.

3. The method for controlling switching signals based on EVT combinational logic according to claim 2, wherein said specific determination step of T parameter setting is:

s104, when the current temperature is greater than or equal to the range and is less than the range height, the current temperature is greater than or equal to the set temperature plus the temperature high deviation, the switch is turned on, the current temperature is less than the set temperature plus the temperature high deviation, and when a set return difference exists, the return difference is subtracted, and the switch is turned off;

4. The method according to claim 1, wherein the AL parameter sets a common temperature alarm mode and humidity alarm mode, and the temperature alarm mode and the humidity alarm mode respectively have six categories of a positive indication value upper limit, a positive indication value lower limit, a positive deviation upper limit, a positive deviation lower limit, a reverse deviation upper limit, a reverse deviation lower limit, an upper and lower limit deviation range, a reverse indication value upper limit and a reverse indication value lower limit, wherein the positive and reverse indicate the output direction standby action, each category is divided into no indication and an indication, and the indication indicates the first out-of-range no action and the second out-of-range action.

5. The method for controlling switch signals based on EVT combinational logic according to claim 4, wherein said AL parameter setting is specifically determined by the steps of:

s201, when the alarm signal is in an OFF state, judging;

s202, when the alarm signal is in an ON state, judging;

s2021, when the variable value meets the alarm condition, keeping the ON state;

6. The method for controlling switch signals based ON EVT combinational logic according to claim 5, wherein in step S2022, when the alarm signal changes from ON state to OFF state, the alarm condition is one of the set value plus or minus the back difference.

7. The method of claim 1, wherein the IS parameter sets are configured such that when the IS activated, the switch IS alternately changed from the on state to the off state for a corresponding period of time.