Controller switch input point expansion device

Abstract

The present invention discloses a device for expanding the number of digital input points in a controller. The device utilizes diodes, a commonly used component in the electrical industry, to form a special diode array. This array, combined with a cross switch and relays, serves as an external circuit connected to the controller input points. This array, in conjunction with a simple program segment within the controller, achieves the goal of expanding the number of digital input points. The device utilizes diodes, which have only two states: open and closed, preventing misidentification. This device provides greater stability and accuracy when operating only one digital input point.

Description

Technical Field

[0001] The present invention relates to the technical field of controllers, in particular to a device for expanding the number of switch input points of a controller. Background Art

[0002] Controllers currently on the market generally feature analog and digital inputs and outputs. For a given controller model, the number of inputs and outputs is fixed. Digital inputs are a very common input. If a controller's digital inputs are insufficient due to special circumstances, a common approach is to expand the number by adding dedicated digital expansion modules that match the controller model. While convenient, these expansion modules have the following drawbacks: 1) they are relatively expensive; 2) they require a specific controller model, resulting in limited interoperability. For example, digital expansion modules for Siemens and Schneider controllers are not interoperable; and 3) their lead times are limited by the manufacturer. Summary of the Invention

[0003] The purpose of the present invention is to address the shortcomings of traditional digital expansion modules, such as the need to match the controller, lack of versatility, and high cost, for single-step manual operation conditions (such as the operation of the swing arm of a guardrail washing vehicle). A digital expansion device that is universally applicable to controllers of various brands is provided to reduce costs and has the characteristics of common manufacturing materials, simple production, and easy supply.

[0004] The technical solution adopted in the present invention is:

[0005] A device for expanding the number of switch input points of a controller includes a circuit board and at least one operating switch. The circuit board has M switch input terminals and N output terminals, where M is greater than N; the N output terminals of the circuit board correspond to the N input terminals of the controller; each operating switch has a common terminal and one or more output terminals, the output terminals of the operating switch are respectively connected to the M switch input terminals of the circuit board, the common terminal of the operating switch is connected to the positive pole of the power supply, all output terminals of the same operating switch are connected to the control coil of the intermediate relay corresponding to the operating switch, and a normally closed switch of the intermediate relay corresponding to the operating switch is connected in series to the connection line between the common terminal of each other operating switch and the positive pole of the power supply to form an interlocking circuit; the other ends of the control coils of all the intermediate relays are connected to the negative pole of the power supply;

[0006] The first N switch input terminals on the circuit board are each connected to the N output terminals of the circuit board in a one-to-one correspondence; the other switch input terminals on the circuit board are each simultaneously output to two or more different combinations of circuit board output terminals, so as to establish a one-to-one correspondence between the switch input terminals and the different combinations of output terminals; and when the switch input terminals on the circuit board are connected to each circuit board output terminal, they are first connected to the anode of a first diode, and then the cathode of the first diode is connected to the corresponding circuit board output terminal.

[0007] Furthermore, each output end of the same operating switch is connected to the anode of a second diode, and the cathode of the second diode corresponding to the same operating switch is connected to the control coil of the intermediate relay corresponding to the operating switch.

[0008] Furthermore, the value of M is less than 2 N .

[0009] Furthermore, the value of M is 7 and the value of N is 3; or, the value of M is 3 and the value of N is 2; or, the value of M is 15 and the value of N is 4.

[0010] Furthermore, the operating switch is a cross switch, a two-speed transfer switch or a three-speed transfer switch.

[0011] Furthermore, the operating switch uses two cross switches, and the circuit board has 7 switch input terminals and 3 output terminals; the 3 output terminals of the circuit board correspond to the 3 input terminals of the access controller; each operating switch has a common terminal and 4 output terminals, and the 7 output terminals of the two operating switches are respectively connected to the 7 switch input terminals of the circuit board.

[0012] The four circuit board switch input terminals connected to one of the operating switches on the circuit board are each connected to the anode of a second diode.

[0013] The cathode of the second diode corresponding to one of the operating switches is connected to the control coil of the intermediate relay KA1; the other end of the control coil of KA1 is connected to the negative electrode of the power supply, and the positive electrode of the power supply is connected to the common end of the other operating switch through the normally closed switch of the intermediate relay KA1;

[0014] The three circuit board switch input terminals connected to another operating switch on the circuit board are each connected to the anode of a second diode.

[0015] The cathode of the second diode corresponding to another operating switch is connected to the control coil of the intermediate relay KA2; the other end of the control coil of KA2 is connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the common end of one of the operating switches through the normally closed switch of the intermediate relay KA2.

[0016] Furthermore, the switch input terminal M1 on the circuit board is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q1 of the circuit board;

[0017] The switch input terminal M2 on the circuit board is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q2 of the circuit board;

[0018] The switch input terminal M3 on the circuit board is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q3 of the circuit board;

[0019] The switch input terminal M4 on the circuit board is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q1 of the circuit board, and the cathode of the other first diode is connected to the output terminal Q2 of the circuit board;

[0020] The switch input terminal M5 on the circuit board is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q1 of the circuit board, and the cathode of the other first diode is connected to the output terminal Q3 of the circuit board;

[0021] The switch input terminal M6 on the circuit board is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q2 of the circuit board, and the cathode of the other first diode is connected to the output terminal Q3 of the circuit board;

[0022] The switch input terminal M7 on the circuit board is connected to the anodes of the three first diodes, and the cathodes of the three first diodes are connected to the output terminals Q1, Q2 and Q3 of the circuit board in a one-to-one correspondence.

[0023] The present invention adopts the above technical solution, and for the single-step manual operation working condition, mainly adopts the very commonly used components in the electrical industry - diodes for production, which are connected and combined into a special diode array, matched with a cross switch and a relay, connected to the controller input point as an external circuit, and used in conjunction with a simple program segment inside the controller to achieve the purpose of expanding the number of digital input points. The present invention adopts diodes, which have only two states, open and closed, and will not cause recognition errors. It is more stable and accurate under the working condition of operating only one switch quantity at a time. The present invention does not rely on the controller's recognition of voltage, and will not cause errors due to inaccurate recognition of voltage, nor will it cause controller recognition errors due to the actual resistance value of the resistor changing with product quality or ambient temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments;

[0025] Figure 1 This is a circuit diagram of a device for expanding the number of switch input points of a controller according to the present invention;

[0026] Figure 2 Input and output truth value charts for the expansion device of the present invention;

[0027] Figure 3 This is a sample diagram of the controller decoding program. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0029] like Figures 1 to 3 As shown in FIG1 , the present invention discloses a device for expanding the number of switch input points of a controller, which includes a circuit board 1 and at least one operating switch 2. The circuit board 1 has M switch input terminals and N output terminals, and the value of M is greater than N; the N output terminals of the circuit board 1 correspond to the N input terminals of the controller 3; each operating switch 2 has a common terminal and one or more output terminals, the output terminals of the operating switch 2 are respectively connected to the M switch input terminals of the circuit board 1, the common terminal of the operating switch 2 is connected to the positive pole of the power supply, all output terminals of the same operating switch 2 are connected to the control coil of the intermediate relay corresponding to the operating switch 2, and a normally closed switch of the intermediate relay corresponding to the operating switch 2 is respectively connected in series to the connection line between the common terminal of each other operating switch 2 and the positive pole of the power supply to form an interlocking circuit; the other ends of the control coils of all the intermediate relays are connected to the negative pole of the power supply;

[0030] The first N switch input terminals on circuit board 1 are each connected one-to-one with the N output terminals of circuit board 1; the other switch input terminals on circuit board 1 are each simultaneously output to two or more different combinations of output terminals of circuit board 1, so as to establish a one-to-one correspondence between the switch input terminals and the different combinations of output terminals; and when the switch input terminals on circuit board 1 are connected to each output terminal of circuit board 1, they are first connected to the anode of a first diode, and then the cathode of the first diode is connected to the corresponding output terminal of circuit board 1.

[0031] Furthermore, each output end of the same operating switch 2 is connected to the anode of a second diode, and the cathode of the second diode corresponding to the same operating switch 2 is connected to the control coil of the intermediate relay corresponding to the operating switch 2 .

[0032] Furthermore, the value of M is less than 2 N .

[0033] Furthermore, the value of M is 7 and the value of N is 3; or, the value of M is 3 and the value of N is 2; or, the value of M is 15 and the value of N is 4.

[0034] Specifically, the device for expanding the number of switch input points in the present invention is not limited to expanding 3 switch input points to 7 switch input points. Expansion devices that expand 2 switch input points to 3 switch input points or 4 switch input points to 15 switch input points based on the same principle are also within the scope of protection of the present invention.

[0035] Furthermore, the operating switch 2 in the present invention is not limited to a cross switch, and two-speed, three-speed and other conversion switches are all within the scope of protection of the invention.

[0036] The specific principle of the present invention is described in detail below:

[0037] like Figure 1 As shown, the operating switch 2 uses two cross switches, and the circuit board 1 has 7 switch input terminals and 3 output terminals; the 3 output terminals of the circuit board 1 correspond to the 3 input terminals of the access controller 3; each operating switch 2 has a common terminal and 4 output terminals, and the 7 output terminals of the two operating switches 2 are respectively connected to the 7 switch input terminals of the circuit board 1.

[0038] Each of the four switch input terminals of circuit board 1 connected to one of the operating switches 2 is connected to the anode of a second diode. The cathode of the second diode corresponding to one of the operating switches 2 is connected to the control coil of intermediate relay KA1. The other end of the control coil of KA1 is connected to the negative electrode of the power supply, and the positive electrode of the power supply is connected to the common terminal of another operating switch 2 through the normally closed switch of intermediate relay KA1.

[0039] The three switch input terminals of the circuit board 1 connected to another operating switch 2 are each connected to the anode of a second diode.

[0040] The cathode of the second diode corresponding to another operating switch 2 is connected to the control coil of the intermediate relay KA2; the other end of the control coil of KA2 is connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the common end of one of the operating switches 2 through the normally closed switch of the intermediate relay KA2.

[0041] The switch input terminal M1 on the circuit board 1 is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q1 of the circuit board 1;

[0042] The switch input terminal M2 on the circuit board 1 is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q2 of the circuit board 1;

[0043] The switch input terminal M3 on the circuit board 1 is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q3 of the circuit board 1;

[0044] The switch input terminal M4 on the circuit board 1 is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q1 of the circuit board 1, and the cathode of the other first diode is connected to the output terminal Q2 of the circuit board 1;

[0045] The switch input terminal M5 on the circuit board 1 is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q1 of the circuit board 1, and the cathode of the other first diode is connected to the output terminal Q3 of the circuit board 1;

[0046] The switch input terminal M6 on the circuit board 1 is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q2 of the circuit board 1, and the cathode of the other first diode is connected to the output terminal Q3 of the circuit board 1;

[0047] The switch input terminal M7 on the circuit board 1 is connected to the anodes of the three first diodes, and the cathodes of the three first diodes are connected to the output terminals Q1 , Q2 and Q3 of the circuit board 1 in a one-to-one correspondence.

[0048] The cross switch and printed circuit board form a switch expansion device with a simple structure, made of common materials and low cost. With proper layout, the device can be compact and easy to install. The cross switch can be placed on the operating panel along with the other operating switches 2. This device is a simple diode circuit, requires no additional power supply, and is independent of the internal components of the controller 3. It can be used with controllers of various brands, demonstrating its versatility.

[0049] Depend on Figure 1 It can be seen that the expansion device has 7 input terminals (M1~M7) and 3 output terminals (I1~I3) which are connected to the 3 switch input points of the controller 3, which is equivalent to expanding the original 3 switch input points of the controller 3 to 7 switch input points. Figure 2 The truth table in the figure details the input and output logic relationship of the expansion device. It can be seen that this expansion method uses the combination of the three switch input points of the original controller 3 to reflect the status of the seven switch input points. The expansion device plays a role similar to encoding, and each expansion input point corresponds to a combination code of the three input points of the original controller. In addition, according to Figure 1 From the wiring principle, it can be seen that the cooperation between the cross switch and the printed circuit board can realize the interlocking between the 7 input points, ensuring that only one action can be operated at the same time.

[0050] After encoding, controller 3 cannot recognize the expanded switch input points, and a program needs to be added to the controller 3 program for decoding. Figure 3 The following is an example of a decoding program ladder diagram, which can be used as a reference. M1 to M7 in the program are the expanded input points. Figure 1The M1 to M7 correspond to each other. Figure 1 When a certain point is input in M1~M7, the corresponding point in M1~M7 in the program will be energized.

[0051] The present invention adopts the above technical solution, and for the single-step manual operation working condition, mainly adopts the very commonly used components in the electrical industry - diodes for production, and connects and combines them into a special diode array, cooperates with a cross switch and a relay, and is connected to the input point of the controller 3 as an external circuit, and is used in conjunction with a simple program segment inside the controller 3 to achieve the purpose of expanding the number of digital input points. The present invention adopts diodes, which have only two states, open and closed, and will not cause recognition errors. It is more stable and accurate under the working condition of only operating one switch quantity at a time. The present invention does not rely on the controller 3 to identify the voltage, and will not cause errors due to inaccurate recognition of the voltage, nor will it cause the controller 3 to identify errors due to the actual resistance value of the resistor changing with the product quality or the ambient temperature.

[0052] The present invention has the beneficial effect of resolving the problems of conventional standard digital expansion modules for controllers 3, such as high cost, large installation volume, poor versatility, and unstable supply cycles. It provides a digital input point expansion module that is simple to manufacture and install, easy to use, and compatible with controllers 3 of various brands.

[0053] Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present application is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

Claims

1. A device for expanding the number of switch input points of a controller, characterized by: It includes a circuit board and at least one operating switch. The circuit board has M switch input terminals and N output terminals, and the value of M is greater than N. The N output terminals of the circuit board correspond to the N input terminals of the controller. Each operating switch has a common terminal and one or more output terminals. The output terminals of the operating switch are respectively connected to the M switch input terminals of the circuit board. The common terminal of the operating switch is connected to the positive pole of the power supply. All output terminals of the same operating switch are connected to the control coil of the intermediate relay corresponding to the operating switch. The connection line between the common terminal of each other operating switch and the positive pole of the power supply is respectively connected in series with a normally closed switch of the intermediate relay corresponding to the operating switch to form an interlocking circuit. The other end of the control coil of all the intermediate relays is connected to the negative pole of the power supply. The first N switch input terminals on the circuit board are each connected to the N output terminals of the circuit board in a one-to-one correspondence; the other switch input terminals on the circuit board are each simultaneously output to two or more different combinations of circuit board output terminals, so as to establish a one-to-one correspondence between the switch input terminals and the different combinations of output terminals; and when the switch input terminals on the circuit board are connected to each circuit board output terminal, they are first connected to the anode of a first diode, and then the cathode of the first diode is connected to the corresponding circuit board output terminal.

2. The device for expanding the number of switch input points of a controller according to claim 1, characterized in that: Each output end of the same operating switch is connected to the anode of a second diode, and the cathode of the second diode corresponding to the same operating switch is connected to the control coil of the intermediate relay corresponding to the operating switch.

3. The device for expanding the number of switch input points of a controller according to claim 1, wherein: The value of M is less than 2 N .

4. The device for expanding the number of switch input points of a controller according to claim 1, characterized in that: The value of M is 7 and the value of N is 3; or, the value of M is 3 and the value of N is 2; or, the value of M is 15 and the value of N is 4; the operating switch is a cross switch, a two-speed transfer switch or a three-speed transfer switch.

5. The device for expanding the number of switch input points of a controller according to claim 1, characterized in that: The operating switch uses two cross switches. The circuit board has 7 switch input terminals and 3 output terminals. The 3 output terminals of the circuit board correspond to the 3 input terminals of the access controller. Each operating switch has a common terminal and 4 output terminals. The 7 output terminals of the two operating switches are respectively connected to the 7 switch input terminals of the circuit board. The four circuit board switch input terminals connected to one of the operating switches on the circuit board are each connected to the anode of a second diode. The cathode of the second diode corresponding to one of the operating switches is connected to the control coil of the intermediate relay KA1; the other end of the control coil of KA1 is connected to the negative electrode of the power supply, and the positive electrode of the power supply is connected to the common end of the other operating switch through the normally closed switch of the intermediate relay KA1; The three circuit board switch input terminals connected to another operating switch on the circuit board are each connected to the anode of a second diode. The cathode of the second diode corresponding to another operating switch is connected to the control coil of the intermediate relay KA2; the other end of the control coil of KA2 is connected to the negative pole of the power supply, and the positive pole of the power supply is connected to the common end of one of the operating switches through the normally closed switch of the intermediate relay KA2.

6. The device for expanding the number of switch input points of a controller according to claim 1, characterized in that: The switch input terminal M1 on the circuit board is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q1 of the circuit board; The switch input terminal M2 on the circuit board is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q2 of the circuit board; The switch input terminal M3 on the circuit board is connected to the anode of a first diode, and the cathode of the first diode is connected to the output terminal Q3 of the circuit board; The switch input terminal M4 on the circuit board is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q1 of the circuit board, and the cathode of the other first diode is connected to the output terminal Q2 of the circuit board; The switch input terminal M5 on the circuit board is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q1 of the circuit board, and the cathode of the other first diode is connected to the output terminal Q3 of the circuit board; The switch input terminal M6 on the circuit board is connected to the anodes of two first diodes, wherein the cathode of one of the first diodes is connected to the output terminal Q2 of the circuit board, and the cathode of the other first diode is connected to the output terminal Q3 of the circuit board; The switch input terminal M7 on the circuit board is connected to the anodes of the three first diodes, and the cathodes of the three first diodes are connected to the output terminals Q1, Q2 and Q3 of the circuit board in a one-to-one correspondence.

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