A Reed Switch-based Valve Position Indicator, Control Method and Control System

Abstract

The present invention discloses a valve position indicator, control method and control system based on a reed switch, which includes a front magnetic control module and a rear control module. The front magnetic control module is installed on the valve body, and the rear control module is electrically connected to the front magnetic control module through a wire. The front magnetic control module includes a reed switch circuit unit. The voltage terminal of the reed switch circuit unit is connected to a power supply, and the first signal output terminal and the second signal output terminal are electrically connected to a controller through I / O terminals. By separating the front magnetic control module and the rear control module, and installing the front magnetic control module at the high-temperature valve and the rear control module at a position far from the valve body, the present invention can avoid damage to the controller in the rear control module caused by the high-temperature environment. By setting n reed switch power supplies and controlling them through n relays, the controller always receives the output signals of the reed switch circuit units in a non-fault state.

Description

Technical Field

[0001] The present invention relates to the field of control technology, and particularly to a valve position indicator, a control method and a control system based on a reed switch. Background Art

[0002] The typical design of traditional valve position indicators is based on reed switches and other magneto-control circuit devices. The magnetic induction characteristics of the reed switch and the magneto-control circuit devices (when the magnetic field approaches, the reed switch closes; when the magnetic field moves away, the reed switch opens) are used to indicate whether the valve switch is in place. However, the industrial environment is often complex, such as in the nuclear industry environment, with high temperature, high radiation, large vibration and noise, etc. Therefore, position indicators such as reed switches are prone to failure after long-term use. Summary of the Invention

[0003] The technical problem to be solved by the present invention is that traditional valve position indicators are prone to failure. The purpose is to provide a valve position indicator, a control method and a control system based on a reed switch, which solve the problem that the valve position indicator is prone to failure.

[0004] The present invention is achieved by the following technical solutions:

[0005] A valve position indicator based on a reed switch includes a front magnetic control module and a rear control module. The front magnetic control module is installed on the valve body, and the rear control module is electrically connected to the front magnetic control module through a wire;

[0006] The rear control module includes a controller, I / O terminals and a relay;

[0007] The front magnetic control module includes a reed switch circuit unit. The reed switch circuit unit includes a voltage terminal, a first signal output terminal and a second signal output terminal. The voltage terminal of the reed switch circuit unit is connected to a power supply, and the first signal output terminal and the second signal output terminal of the reed switch circuit unit are electrically connected to the controller through the I / O terminals;

[0008] Among them, the number of the reed switch circuit units is n, and n reed switch circuit units are connected in parallel. The number of the relays is 2n, and the excitation ends of the 2n relays are electrically connected to the controller through the I / O terminals. The switch ends of the relays are respectively arranged between the first signal output terminal and the second signal output terminal of the reed switch circuit unit and the I / O terminals.

[0009] Specifically, the reed switch circuit unit includes a first resistor, a second resistor, a position indicating reed switch, and an accompanying monitoring reed switch. The first end of the first resistor is externally connected to a voltage, and the first end of the second resistor is externally connected to a voltage. The first end of the position indicating reed switch is electrically connected to the second end of the first resistor, and the first end of the accompanying monitoring reed switch is connected to the second end of the second resistor. The second ends of the position indicating reed switch and the accompanying monitoring reed switch are connected and then grounded.

[0010] The first end of the position indicating reed switch is the first signal output end of the reed switch circuit unit, and the first end of the accompanying monitoring reed switch is the second signal output end of the reed switch circuit unit.

[0011] Optionally, the n reed switch circuits are sequentially set as the first reed switch circuit unit, the second reed switch circuit unit,..., the i-th reed switch circuit unit,..., the n-th reed switch circuit unit; the (i + 1)-th reed switch circuit unit is the redundant backup of the i-th reed switch circuit unit, where i ∈ [1, n].

[0012] The 2n relays are sequentially set as the first relay, the second relay,..., the i-th relay,..., the n-th relay, the (n + 1)-th relay, the (n + 2)-th relay... the (n + i)-th relay,..., the 2n-th relay.

[0013] The switch end of the i-th relay is set between the first signal output end of the i-th reed switch circuit unit and the I / O terminal, and the switch end of the (n + i)-th relay is set between the second signal output end of the i-th reed switch circuit unit and the I / O terminal, where i ∈ [1, n].

[0014] Optionally, the first signal output ends of the n reed switch circuit units are connected in parallel and then electrically connected to the I / O terminal, or the first signal output ends of the n reed switch circuit units are respectively electrically connected to the I / O terminal.

[0015] The second signal output ends of the n reed switch circuit units are connected in parallel and then electrically connected to the I / O terminal, or the second signal output ends of the n reed switch circuit units are respectively electrically connected to the I / O terminal.

[0016] The first signal output end of the reed switch circuit unit is connected to the position signal output end of the pre-magnetic control module, and the second signal output end of the reed switch circuit unit is connected to the monitoring signal output end of the pre-magnetic control module.

[0017] Specifically, when the position indicating reed switch is in the closed state, the first signal output terminal of the reed switch circuit unit outputs a low-level signal; when the position indicating reed switch is in the unclosed state, the first signal output terminal of the reed switch circuit unit outputs a high-level signal;

[0018] When the accompanying monitoring reed switch is in the closed state, the first signal output terminal of the reed switch circuit unit outputs a low-level signal; when the accompanying monitoring reed switch is in the unclosed state, the first signal output terminal of the reed switch circuit unit outputs a high-level signal.

[0019] A control method for a valve position indicator based on a reed switch, used to control a valve position indicator based on a reed switch as described above, the control method includes:

[0020] The controller selects the non-faulty j-th reed switch circuit unit, turns on the j-th relay and the (n + j)-th relay, and at the same time cuts off the other 2n - 2 relays; j ∈ [1, n];

[0021] The position signal output terminal of the pre-magnetic control module outputs a signal s;

[0022] The controller receives s, judges the valve switch state. If s is a low-level signal, it outputs a valve switch in-place signal; if s is a high level, it outputs a valve switch not in-place signal.

[0023] Specifically, the method for the controller to select the non-faulty reed switch circuit unit includes:

[0024] Judge whether the m-th reed switch circuit unit is faulty. If not, use the output signal of the first signal output terminal of the m-th reed switch circuit unit as the output signal s;

[0025] If so, cut off the m-th relay and the (n + m)-th relay, and turn on the (m + 1)-th relay and the (n + m + 1)-th relay;

[0026] Let m = m + 1, and repeat the above steps until the non-faulty reed switch circuit unit is turned on.

[0027] Specifically, the fault detection method for the reed switch circuit unit includes:

[0028] The first signal output terminal of the m-th reed switch circuit unit outputs a signal s m1 , the second signal output terminal of the m-th reed switch circuit unit outputs a signal s m2 ;

[0029] The controller receives s m1 and s m2 , and performs a logical operation on them: s m1 &sm2 =st;

[0030] When the valve moves to the final position, if st=s m2 , it is judged that the position indicating reed switch is faulty; if st=s m1 , it is judged as a fault of the monitoring reed switch;

[0031] When the valve moves to the far position, if st=s m1 , it is judged that the position indicating reed switch is faulty; if st=s m2 , it is judged as a fault with the monitoring reed switch.

[0032] Optionally, when the valve is moved to the final position, the fault condition of the position indicating reed switch or the accompanying monitoring reed switch is not closed;

[0033] When the valve moves to the open position, the fault condition of the position indicating reed switch or the accompanying monitoring reed switch is not separated.

[0034] A control system for a valve position indicator based on a reed switch, wherein the control system stores a computer program, and when the computer program is executed by a processor, the steps of the control method for a valve position indicator based on a reed switch are implemented.

[0035] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0036] The present invention separates a front magnetic control module from a rear control module, installs the front magnetic control module at a high-temperature valve, and installs the rear control module at a position away from the valve body, thereby preventing the high-temperature environment from causing damage to the controller in the rear control module. At the same time, n reed switch power supplies are provided and controlled by n relays, so that the controller always receives the output signal of the reed switch circuit unit in a non-fault state, thereby realizing the diagnosis and fault tolerance functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification and do not constitute a limitation of the embodiments of the present invention.

[0038] Figure 1 The figure is a schematic structural diagram of a valve position indicator based on a reed switch according to the present invention.

[0039] Figure 2 It is a structural schematic diagram of the front magnetic control module according to the present invention.

[0040] Figure 3It is a schematic flow chart of a control method for a valve position indicator based on a reed switch according to the present invention. Detailed implementation manners

[0041] To make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and implementation manners. It can be understood that the specific implementation manners described herein are only used to explain the relevant content and do not limit the present invention.

[0042] In addition, it should also be noted that for the sake of convenience of description, only parts related to the present invention are shown in the accompanying drawings.

[0043] Without conflict, the implementation manners in the present invention and the features in the implementation manners can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and implementation manners.

[0044] Embodiment 1

[0045] As Figure 1 shown, this embodiment provides a valve position indicator based on a reed switch, including a front magnetic control module and a rear control module. The front magnetic control module is installed on the valve body, and the rear control module is electrically connected to the front magnetic control module through a wire.

[0046] The front magnetic control module is heat-resistant and installed on the valve body. The rear control module is not heat-resistant, and its installation or placement position can be far from the valve body. At the same time, in this embodiment, the front magnetic control module can be encapsulated in a heat-resistant housing, and the rear control module can be encapsulated in a conventional housing.

[0047] The rear control module includes a controller, I / O terminals and a relay. The front magnetic control module includes a reed switch circuit unit. The reed switch circuit unit includes a voltage terminal, a first signal output terminal and a second signal output terminal. The voltage terminal of the reed switch circuit unit is connected to a power supply. In this embodiment, +5V is selected. The first signal output terminal and the second signal output terminal of the reed switch circuit unit are electrically connected to the controller through the I / O terminals.

[0048] Principle is briefly described as follows: When the valve switch is in place, the magnet in the valve body will approach the front magnetic control module. At this time, under the influence of the magnet, the reed switch circuit unit in the front magnetic control module will output a signal to the rear control module, and the rear control module will judge whether the valve switch is in place according to the output signal of the front magnetic control module.

[0049] In addition, there may also be a situation where the reed switch circuit unit fails, resulting in inaccurate judgment by the controller. To avoid this situation, the number of reed switch circuit units is set to n, and the n reed switch circuit units are connected in parallel. The number of relays is 2n, and the excitation ends of the 2n relays are electrically connected to the controller through I / O terminals. The switch ends of the relays are respectively arranged between the first signal output end and the second signal output end of the reed switch circuit unit and the I / O terminals.

[0050] By setting multiple reed switch circuit units, if one reed switch circuit unit in the front magnetic control module fails, the rear control module will perform logical analysis and judgment based on the collected signals, and control the relevant relays to automatically switch to another reed switch circuit unit to ensure that the position indicator can continue to operate normally.

[0051] As Figure 2 shown, the reed switch circuit unit in this embodiment includes a first resistor, a second resistor, a position indicating reed switch, and an accompanying monitoring reed switch. The first end of the first resistor is externally connected to a voltage, the first end of the second resistor is externally connected to a voltage, the first end of the position indicating reed switch is electrically connected to the second end of the first resistor, the first end of the accompanying monitoring reed switch is connected to the second end of the second resistor, and the second ends of the position indicating reed switch and the accompanying monitoring reed switch are connected and grounded after connection;

[0052] The position indicating reed switch and the accompanying monitoring reed switch are externally connected to the voltage through the first resistor and the second resistor respectively, so that high and low level signals can still be normally output when any one of the reed switches fails.

[0053] The first end of the position indicating reed switch is the first signal output end of the reed switch circuit unit, and the first end of the accompanying monitoring reed switch is the second signal output end of the reed switch circuit unit.

[0054] The function of the position indicating reed switch is to indicate whether the valve is opened or closed in place, and the function of the accompanying monitoring reed switch is to monitor whether the reed switch circuit unit fails.

[0055] Principle brief description: The reed switch closes under the influence of the valve magnet, so that the reed switch is turned on.

[0056] When the reed switch is in the non-conductive state, the voltages at the first ends of the position indicating reed switch and the accompanying monitoring reed switch are high levels; when the reed switch is in the conductive state, the voltages at the first ends of the position indicating reed switch and the accompanying monitoring reed switch are low levels.

[0057] The working states of the two reed switches can be judged through the output signals of the first signal output end of the reed switch circuit unit and the second signal output end of the reed switch circuit unit.

[0058] For the convenience of description, assume that n reed switch circuits are successively set as the first reed switch circuit unit, the second reed switch circuit unit, …, the i-th reed switch circuit unit, …, the n-th reed switch circuit unit; the (i + 1)-th reed switch circuit unit is the redundant backup of the i-th reed switch circuit unit, where i ∈ [1, n].

[0059] The 2n relays are successively set as the first relay, the second relay, …, the i-th relay, …, the n-th relay, the (n + 1)-th relay, the (n + 2)-th relay, …, the (n + i)-th relay, …, the 2n-th relay; the switch terminal of the i-th relay is set between the first signal output terminal of the i-th reed switch circuit unit and the I / O terminal, and the switch terminal of the (n + i)-th relay is set between the second signal output terminal of the i-th reed switch circuit unit and the I / O terminal, where i ∈ [1, n].

[0060] Take Figure 2 as an example, n = 3, that is, it includes the first reed switch circuit unit, the second reed switch circuit unit, and the third reed switch circuit unit. The first relay k11, the second relay k21, and the third relay k22.

[0061] It can be seen that only 3 relays are set in this embodiment, and the switch terminals are connected in series on the first signal output terminal of the reed switch circuit unit.

[0062] In addition, 3 more relays can be added in this embodiment, and the switch terminals of the added three relays are connected in series on the second signal output terminal of the reed switch circuit unit.

[0063] The relays connected to the same reed switch circuit unit work synchronously, so as to realize whether a certain reed switch circuit unit is connected or not.

[0064] According to the number of I / O terminals, it is possible to connect the same type of signal output terminals of multiple reed switch circuit units and then connect to the I / O terminal, or to connect to the I / O terminal independently.

[0065] The first signal output terminals of the n reed switch circuit units are connected in parallel and then electrically connected to the I / O terminal, or the first signal output terminals of the n reed switch circuit units are respectively electrically connected to the I / O terminal;

[0066] The second signal output terminals of the n reed switch circuit units are connected in parallel and then electrically connected to the I / O terminal, or the second signal output terminals of the n reed switch circuit units are respectively electrically connected to the I / O terminal.

[0067] Therefore, it can be seen that the first signal output terminal of the reed switch circuit unit is connected to the position signal output terminal of the front magnetic control module, and the second signal output terminal of the reed switch circuit unit is connected to the monitoring signal output terminal of the front magnetic control module.

[0068] The reed switch is grounded when it is closed. Therefore, when the position indicating reed switch is in the closed state, the first signal output terminal of the reed switch circuit unit outputs a low-level signal. When the accompanying monitoring reed switch is in the closed state, the second signal output terminal of the reed switch circuit unit outputs a low-level signal.

[0069] The reed switch is not grounded when it is not closed. Therefore, when the position indicating reed switch is in the non-closed state, the first signal output terminal of the reed switch circuit unit outputs a high-level signal. When the accompanying monitoring reed switch is in the non-closed state, the second signal output terminal of the reed switch circuit unit outputs a high-level signal.

[0070] Embodiment 2

[0071] This embodiment provides a control method for controlling a reed switch-based valve position indicator as described above. The control method includes:

[0072] In the first step, the controller selects the non-faulty j-th reed switch circuit unit, turns on the j-th relay and the (n + j)-th relay, and simultaneously cuts off the other 2n - 2 relays; j ∈ [1, n]; that is, in order to avoid wasting the computing power of the controller, only one normally working reed switch circuit unit is selected in this embodiment for collecting the position signals of the valve. When the other relays are cut off, the output signals of the corresponding reed switch circuit units are not collected, and the controller does not perform logical calculations on them.

[0073] In the second step, the position signal output terminal of the front magnetic control module outputs a signal s.

[0074] In the third step, the controller receives s and judges the valve switch state. If s is a low-level signal, the controller outputs a valve switch in-place signal (low-level signal, which can also be customized); if s is a high level, the controller outputs a valve switch not in-place signal (high-level signal, which can also be customized).

[0075] However, when the currently used reed switch circuit unit fails, it is necessary to perform fault diagnosis, fault location and line switching. Therefore, the specific method includes:

[0076] S1. Judge whether the m-th reed switch circuit unit is faulty. The judgment method includes:

[0077] s11. The first signal output terminal of the m-th reed switch circuit unit outputs a signal s m1 , the second signal output terminal of the m-th reed switch circuit unit outputs a signal s m2 ;

[0078] s12. The controller receives s m1 and s m2 , and performs a logical operation on them: s m1 &s m2 = st;

[0079] s13. When the valve runs to the in-place position, if both the position-indicating reed switch and the accompanying monitoring reed switch are working properly at this time, then both the position-indicator reed switch and the accompanying monitoring reed switch should be closed.

[0080] However, when the controller performs logical operation and gets st = s m2 , it is determined that the position-indicating reed switch is faulty; if it gets st = s m1 , it is determined that the accompanying monitoring reed switch is faulty;

[0081] s14. When the valve runs to the away position, if both the position-indicating reed switch and the accompanying monitoring reed switch are working properly at this time, then both the position-indicator reed switch and the accompanying monitoring reed switch should be open.

[0082] However, when the controller performs logical operation and gets st = s m1 , it is determined that the position-indicating reed switch is faulty; if it gets st = s m2 , it is determined that the accompanying monitoring reed switch is faulty.

[0083] S2. If the reed switch circuit unit is not faulty and can work normally, then the output signal of the first signal output terminal of the m-th reed switch circuit unit is used as the output signal s;

[0084] S3. If the reed switch circuit unit is faulty and cannot work normally, then cut off the m-th relay and the (n + m)-th relay, and turn on the (m + 1)-th relay and the (n + m + 1)-th relay;

[0085] S4. Let m = m + 1, and repeat the above steps S1 - S3 until the non-faulty reed switch circuit unit is turned on.

[0086] The valve position indicator can be used as a valve-open position indicator or a valve-closed position indicator, and the above method can be used for its analysis method.

[0087] Embodiment III

[0088] A control system for a valve position indicator based on reed switches, the control system stores a computer program, and when the computer program is executed by a processor, it implements the steps of a control method for a valve position indicator based on reed switches as described above.

[0089] Generally, the above control system performs relevant operations through a controller.

[0090] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned method for testing an antenna interface unit are implemented.

[0091] Without loss of generality, computer-readable media can include computer storage media and communication media. Computer storage media includes volatile and non-volatile, removable and non-removable media implemented by any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes RAM, ROM, EPROM, EEPROM, flash memory or other solid-state storage technologies, CD-ROM, DVD or other optical storage, magnetic tape cartridges, magnetic tape, disk storage or other magnetic storage devices. Of course, those skilled in the art will know that computer storage media is not limited to the above several. The above-mentioned system memory and mass storage device can be collectively referred to as memory.

[0092] In the description of this specification, the description of reference terms such as "one embodiment / way", "some embodiments / ways", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment / way or example are included in at least one embodiment / way or example of this application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment / way or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments / ways or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments / ways or examples described in this specification and the features of different embodiments / ways or examples.

[0093] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0094] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present invention and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications can be made based on the above invention, and these changes or modifications are still within the scope of the present invention.

Claims

1. A valve position indicator based on a reed switch, characterized in that: It includes a front magnetic control module and a rear control module, wherein the front magnetic control module is mounted on the valve body, and the rear control module is electrically connected to the front magnetic control module via a wire; The rear control module includes a controller, I / O terminals and relays; The front magnetic control module includes a reed switch circuit unit, which includes a voltage end, a first signal output end, and a second signal output end. The voltage end of the reed switch circuit unit is connected to a power supply, and the first signal output end and the second signal output end of the reed switch circuit unit are electrically connected to the controller through the I / O terminal. The number of the reed switch circuit units is n, and the n reed switch circuit units are arranged in parallel. The number of the relays is 2n, and the excitation ends of the 2n relays are electrically connected to the controller through the I / O terminal. The switch ends of the relays are respectively arranged between the first signal output end of the reed switch circuit unit and the second signal output end of the reed switch circuit unit and the I / O terminal. The reed switch circuit unit includes a first resistor, a second resistor, a position indicating reed switch, and a companion monitoring reed switch, wherein a first end of the first resistor is externally connected to a voltage, a first end of the second resistor is externally connected to a voltage, a first end of the position indicating reed switch is electrically connected to a second end of the first resistor, a first end of the companion monitoring reed switch is connected to a second end of the second resistor, and a second end of the position indicating reed switch and a second end of the companion monitoring reed switch are connected and then grounded; The first end of the position indicating reed switch is the first signal output end of the reed switch circuit unit, and the first end of the accompanying monitoring reed switch is the second signal output end of the reed switch circuit unit. The n reed switch circuits are sequentially configured as the first reed switch circuit unit, the second reed switch circuit unit, ..., the i-th reed switch circuit unit, ..., the n-th reed switch circuit unit; the i+1-th reed switch circuit unit is a redundant backup for the i-th reed switch circuit unit, i∈[1,n]; The 2n relays are sequentially set to be the first relay, the second relay, ..., the i-th relay, ..., the n-th relay, the n+1-th relay, the n+2-th relay, ..., the n+i-th relay, ..., the 2n-th relay; The switch end of the i-th relay is arranged between the first signal output end of the i-th reed switch circuit unit and the I / O terminal, and the switch end of the n+i-th relay is arranged between the second signal output end of the i-th reed switch circuit unit and the I / O terminal, i∈[1,n].

2. A valve position indicator based on a reed switch according to claim 1, characterized in that: The first signal output ends of the n reed switch circuit units are connected in parallel and electrically connected to the I / O terminal, or the first signal output ends of the n reed switch circuit units are electrically connected to the I / O terminal respectively; The second signal output ends of the n reed switch circuit units are connected in parallel and electrically connected to the I / O terminal, or the second signal output ends of the n reed switch circuit units are electrically connected to the I / O terminal respectively; The first signal output end of the reed switch circuit unit is connected to the position signal output end of the front magnetic control module, and the second signal output end of the reed switch circuit unit is connected to the monitoring signal output end of the front magnetic control module.

3. A valve position indicator based on a reed switch according to claim 1 or 2, characterized in that: When the position indicating reed switch is in a closed state, the first signal output end of the reed switch circuit unit outputs a low level signal; when the position indicating reed switch is in an unclosed state, the first signal output end of the reed switch circuit unit outputs a high level signal; When the accompanying monitoring reed switch is in a closed state, the first signal output end of the reed switch circuit unit outputs a low-level signal; when the accompanying monitoring reed switch is in an unclosed state, the first signal output end of the reed switch circuit unit outputs a high-level signal.

4. A control method for a valve position indicator based on a reed switch, characterized in that: For controlling a valve position indicator based on a reed switch as claimed in claim 3, the control method comprises: The controller selects the jth reed switch circuit unit that is not faulty, and turns on the jth relay and the n+jth relay, while turning off the other 2n-2 relays; j∈[1,n]; The position signal output terminal of the front magnetic control module outputs a signal s; The controller receives s and determines the valve switch status. If s is a low-level signal, it outputs a valve switch in place signal; if s is a high-level signal, it outputs a valve switch not in place signal.

5. The control method of a valve position indicator based on a reed switch according to claim 4, characterized in that: The controller selects the non-faulty reed switch circuit unit in the following ways: Determine whether the mth reed switch circuit unit is faulty, and if not, use the output signal of the first signal output terminal of the mth reed switch circuit unit as the output signal s; If so, cut off the mth relay and the n+mth relay, and connect the m+1th relay and the n+m+1th relay; Let m=m+1 and repeat the above steps until the non-faulty reed switch circuit unit is connected.

6. The control method of a valve position indicator based on a reed switch according to claim 5, characterized in that: Fault detection methods for reed switch circuit units include: The first signal output terminal of the mth reed switch circuit unit outputs a signal s m1 The second signal output terminal of the mth reed switch circuit unit outputs a signal s m2 ; The controller receives m1 and s m2 , and perform logical operations on it: s m1 &s m2 =st; When the valve moves to the final position, if st=s m2 , it is judged that the position indicating reed switch is faulty; if st=s m1 , it is judged as a fault of the monitoring reed switch; When the valve moves to the far position, if st=s m1 , it is judged that the position indicating reed switch is faulty; if st=s m2 , it is judged as a fault with the monitoring reed switch.

7. A control method for a valve position indicator based on a reed switch according to claim 6, characterized in that: When the valve moves to the final position, the fault condition of the position indicating reed switch or the accompanying monitoring reed switch is not closed; When the valve moves to the open position, the fault condition of the position indicating reed switch or the accompanying monitoring reed switch is not separated.

8. A control system for a valve position indicator based on a reed switch, wherein the control system stores a computer program, characterized in that: When the computer program is executed by a processor, the steps of a control method for a valve position indicator based on a reed switch according to any one of claims 4 to 7 are implemented.

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