PLC controller

Abstract

The utility model discloses a PLC (Programmable Logic Controller), which relates to the technical field of controllers and comprises a host, an expansion module and a connecting assembly, and a first connecting part is arranged on the side wall of the host; the expansion module is slidably connected to one side of the host; the connecting assembly comprises a first connecting part and a second connecting part, the side wall of the host is provided with the first connecting part, the two opposite side walls of the expansion module are provided with the first connecting part and the second connecting part respectively, and the second connecting part on the expansion module is in sliding fit with the first connecting part on the host. The first connecting parts and the second connecting parts on the two sides of the expansion module are in corresponding sliding fit; according to the scheme, physical connection is achieved through the first connecting part and the second connecting part in a sliding fit mode, the expansion module can be added or removed according to actual requirements, the installation and disassembly process of the expansion module is simplified through the design of sliding fit, complex tools or steps are not needed, a user can rapidly replace or upgrade the module, and the user experience is improved. And the maintenance convenience is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of controllers, in particular to a PLC controller. Background Art

[0002] A Programmable Logic Controller (PLC) is a digital computing operating system designed specifically for industrial control applications. It controls the operation of various industrial control devices through internal logic operations, counting, and other operational instructions. As the core control device, the PLC's performance, scalability, and ease of use directly impact the efficiency and stability of the entire system. Traditional PLCs lack flexibility in expansion and installation, making them difficult to meet the complex and ever-changing needs of industrial applications. Utility Model Content

[0003] The main purpose of the utility model is to provide a PLC controller, aiming to improve the convenience of expansion installation of the PLC controller.

[0004] To achieve the above objectives, the PLC controller proposed in this utility model includes:

[0005] A host, wherein a side wall of the host is provided with a first connecting portion;

[0006] An expansion module, wherein the expansion module is slidably connected to one side of the host;

[0007] A connecting component includes a first connecting part and a second connecting part. The side wall of the host is provided with the first connecting part, and the two opposite side walls of the expansion module are respectively provided with the first connecting part and the second connecting part. The second connecting part on the expansion module slides with the first connecting part on the host, and the first connecting parts on both sides of the expansion module slide with the second connecting parts accordingly.

[0008] In one embodiment, the host is provided with the first connection parts at both upper and lower ends, and each expansion module is provided with a second connection part at both upper and lower ends corresponding to the first connection parts.

[0009] In one embodiment, the first connecting portion is a first slide rail, and the second connecting portion is a second slide rail.

[0010] The PLC controller also includes a limit assembly, which includes a first limit part and a second limit part. The host is provided with at least one first limit part, and the first limit part and the first connecting part are located on the same side wall. The opposite side walls of the expansion module are respectively provided with a first limit part and a second limit part, and the second limit part and the second connecting part on the expansion module are located on the same side wall. When the expansion module slides to a preset position relative to the host, the first limit part and the second limit part cooperate to limit the relative movement of the host and the expansion module.

[0011] In one embodiment, the first limiting portion is one of a limiting protrusion and a limiting groove, and the second limiting portion is another structure.

[0012] In one embodiment, the PLC controller further includes a mounting clip, wherein the mounting clip is provided on a side wall of the host / the expansion module adjacent to the second connecting portion, and a mounting portion is provided on a side of the mounting clip facing away from the host / the expansion module, and the mounting portion is used to buckle to the mounting rail.

[0013] In one embodiment, the host includes a first shell, a second shell, a box cover, and a mainboard. The first shell, the second shell, and the box cover are detachably connected and enclose a first installation cavity. The mainboard is installed in the first installation cavity. The second shell and the box cover are located on opposite sides of the first shell. The expansion module is provided with an expansion mainboard. A plurality of expansion female sockets and a plurality of expansion male sockets are respectively provided on both sides of the mainboard and the expansion mainboard. The expansion module slides to a preset position relative to the host so that one of the expansion female sockets on the mainboard cooperates with one of the expansion male sockets on the expansion mainboard to achieve electrical connection.

[0014] The first connecting portion is provided on the second shell.

[0015] In one embodiment, the expansion module further includes a third housing, a fourth housing, and an IO terminal. The third housing and the fourth housing enclose a second mounting cavity. The expansion mainboard is mounted in the second mounting cavity. The expansion female socket on the expansion mainboard is exposed in the fourth housing. The expansion male socket on the expansion mainboard is exposed in the third housing. The IO terminal is provided at the connection portion between the third housing and the fourth housing.

[0016] The expansion socket is arranged on the expansion mainboard and exposed in the third shell.

[0017] In one embodiment, the second shell is formed with a plurality of guide grooves, and the guide grooves are arranged along the extension direction of the expansion module, and one guide groove corresponds to one expansion female seat.

[0018] In one embodiment, the PLC controller further includes a cover, which cooperates with the first connecting portion and covers the extended female socket.

[0019] The technical solution of the present utility model proposes a PLC controller, which consists of a host and at least one expansion module. The physical connection is achieved by sliding the first connecting part and the second connecting part. Such a structural design makes the PLC controller highly flexible in spatial layout, and the expansion module can be added or removed according to actual needs to adapt to different application scenarios. In addition, the sliding fit design also simplifies the installation and disassembly process of the expansion module. Without complicated tools or steps, users can quickly replace or upgrade the module, which improves the convenience of maintenance. At the same time, this design also helps to reduce the problem of poor contact caused by improper connection and ensure the reliability of the electrical connection between the host and the expansion module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a PLC controller provided by the present utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the PLC controller from another perspective;

[0023] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the main unit;

[0024] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the expansion module;

[0025] Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure of the expansion module from another perspective;

[0026] Figure 6 for Figure 3 Schematic diagram of the explosion structure of the main engine;

[0027] Figure 7 for Figure 4 Schematic diagram of the exploded structure of the expansion module.

[0028] Description of Figure Numbers:

[0029] 1000, PLC controller; 1, host; 11, first housing; 12, second housing; 121, guide groove; 13, box cover; 14, mainboard; 2, expansion module; 21, third housing; 22, fourth housing; 23, expansion mainboard; 24, IO terminal; 3, connection component; 31, first connection part; 32, second connection part; 41, first limit part; 42, second limit part; 51, extension female socket; 52, extension male socket; 6, mounting clip; 61, mounting part; 7, cover.

[0030] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] A Programmable Logic Controller (PLC) is a digital computing operating system designed specifically for industrial control applications. It controls the operation of various industrial control devices through internal logic operations, counting, and other operational instructions. As the core control device, the PLC's performance, scalability, and ease of use directly impact the efficiency and stability of the entire system. Traditional PLCs lack flexibility in expansion and installation, making them difficult to meet the complex and ever-changing needs of industrial applications.

[0035] To solve the above problems, please refer to Figures 1 to 7 The present invention proposes a PLC controller 1000, including a host 1, an expansion module 2 and a connecting component 3. The side wall of the host 1 is provided with a first connecting portion 31; an expansion module 2 is slidably connected to one side of the host 1; the connecting component 3 includes a first connecting portion 31 and a second connecting portion 32. The side wall of the host 1 is provided with the first connecting portion 31, and the opposite side walls of the expansion module 2 are respectively provided with the first connecting portion 31 and the second connecting portion 32. The second connecting portion 32 on the expansion module 2 is slidably matched with the first connecting portion 31 on the host 1, and the first connecting portion 31 and the second connecting portion 32 on both sides of the expansion module 2 are correspondingly slidably matched.

[0036] The technical solution of the present utility model proposes a PLC controller 1000, which is composed of a host 1 and at least one expansion module 2. The physical connection is achieved by sliding fit between the first connecting portion 31 and the second connecting portion 32. Such a structural design makes the PLC controller 1000 highly flexible in spatial layout, and the expansion module 2 can be added or removed according to actual needs to adapt to different application scenarios. In addition, the sliding fit design also simplifies the installation and disassembly process of the expansion module 2. Without the need for complicated tools or steps, users can quickly replace or upgrade the module, thereby improving the convenience of maintenance. At the same time, this design also helps to reduce the problem of poor contact caused by improper connection, and ensures the reliability of the electrical connection between the host 1 and the expansion module 2.

[0037] In an optional embodiment, to further improve the reliability of the connection between the host 1 and the expansion module 2, please refer to Figures 1 to 3 The main unit 1 is provided with a first connection portion 31 at both ends, and each expansion module 2 is provided with a second connection portion 32 at both ends corresponding to the first connection portion 31. This design means that the expansion module 2 can be connected from the top or bottom of the main unit 1, providing more installation options and flexibility. This allows users to select the optimal installation location for the expansion module 2 based on actual space constraints and functional requirements, optimizing the space utilization of the entire control system. At the same time, this upper and lower connection design also enhances the stability of the expansion module 2 and reduces the possibility of loose connections due to vibration or impact.

[0038] Optionally, the first connecting portion 31 is a first slide rail, and the second connecting portion 32 is a second slide rail. Figures 3 to 5 , a first slide rail is provided on the side wall of the host 1, and a second slide rail is provided on the expansion module 2 corresponding to the first slide rail. The second slide rail can slide in the first slide rail to achieve sliding cooperation between the host 1 and the expansion module 2, thereby achieving the connection of the expansion module 2 to the side wall of the host 1. In this embodiment, the host 1 and the expansion module 2 are matched through two slide rails. In other embodiments, a slide groove can also be provided on the host 1 or the expansion module 2, and a corresponding slide rail or sliding protrusion can be provided on the other component to achieve sliding in the slide groove, which can also achieve the effect of sliding connection between the host 1 and the expansion module 2. In addition, a first slide rail is provided at the upper and lower ends of the host 1, and a second slide rail is also provided at the upper and lower ends of the end of the expansion module 2 close to the host 1, and the opening directions of the first slide rails at the upper and lower ends of the host 1 are opposite, so that when the expansion module 2 is installed, there is always a second slide rail on one side that can hook the first slide rail, which facilitates the installation of the expansion module 2 in place and ensures the stability of the connection between the host 1 and the expansion module 2. Furthermore, a first slide rail is provided on the side of the expansion module 2 facing away from the host 1, corresponding to the second slide rail. This facilitates connecting more expansion modules 2 to the side wall of the previous expansion module 2, thereby realizing the integrated design of multiple expansion modules 2, improving the installation efficiency of the PLC controller 1000, and helping to reduce the overall thickness of the PLC controller 1000. In summary, the design of the first and second slide rails not only simplifies the installation process of the expansion module 2, but also helps to reduce wear caused by friction and extend the service life of the first connecting portion 31 and the second connecting portion 32. In addition, the first and second slide rails can guide the module to be precisely positioned in the correct position, reduce errors during the installation process, and ensure the accuracy of the electrical connection.

[0039] In an optional embodiment, to ensure that the expansion module 2 is installed in place, please refer to Figures 3 to 5The PLC controller 1000 also includes a limit assembly, which includes a first limit portion 41 and a second limit portion 42. The host 1 is provided with at least one first limit portion 41, and the first limit portion 41 and the first connection portion 31 are located on the same side wall. The opposite side walls of the expansion module 2 are respectively provided with a first limit portion 41 and a second limit portion 42, and the second limit portion 42 and the second connection portion 32 on the expansion module 2 are located on the same side wall. When the expansion module 2 slides to a preset position relative to the host 1, the first limit portion 41 and the second limit portion 42 cooperate to limit the relative movement of the host 1 and the expansion module 2. This design ensures that the expansion module 2 can be stably fixed on the host 1 after installation, preventing displacement caused by accidental collision or vibration. The use of limit assemblies improves the stability and reliability of the system because they can prevent the expansion module 2 from shifting during operation, avoiding electrical connection problems. It also helps to protect the electrical components inside the host 1 and the expansion module 2 from damage, thereby extending the service life of the entire PLC controller 1000. The setting of the limit assembly makes the installation process of the PLC controller 1000 more intuitive and simple, allowing the user to clearly know the installation position of the expansion module 2, reducing the possibility of installation errors.

[0040] Furthermore, the first limiting portion 41 is one of a limiting protrusion and a limiting groove, and the second limiting portion 42 is another structure. In the actual design process, in order to ensure that the expansion module 2 slides and is installed in place on the host 1, a limiting structure such as a protrusion or a block can be set at one end of the first slide rail. In this way, when the expansion module 2 is installed in the correct position, the limiting structure restricts the second slide rail to prevent it from continuing to slide, which can also achieve the corresponding installation effect. In this embodiment, by setting limiting protrusions and limiting grooves on the side walls of the host 1 and the expansion module 2 respectively, and the setting positions of the limiting protrusions and limiting grooves avoid the second slide rail and the first slide rail, the expansion module 2 can be installed from both ends of the extension direction of the first slide rail, which facilitates user operation. In addition, because the limiting component is set on the matching side walls of the host 1 and the expansion module 2, it is hidden after the expansion module 2 is installed, which ensures the aesthetics of the PLC controller 1000. During installation, the click sound of the stopper protrusion sliding into the stopper slot confirms that the expansion module 2 is properly installed, eliminating the need for additional steps to check whether the expansion module 2 is installed in the correct position, simplifying the installation process. The combined use of the stopper protrusion and the stopper slot not only improves the accuracy of PLC controller 1000 installation, but also helps reduce connection problems caused by improper installation. This precise positioning mechanism helps improve system stability because the stopper protrusion and the stopper slot prevent the module from accidentally shifting during operation, thereby avoiding possible electrical failures.

[0041] In an optional embodiment, to facilitate the installation of the PLC controller 1000 in the control cabinet, the PLC controller 1000 further includes a mounting clip 6, which is provided on the side wall of the host 1 / expansion module 2 adjacent to the second connection portion 32. The mounting clip 6 is provided with a mounting portion 61 on the side facing away from the host 1 / expansion module 2, and the mounting portion 61 is used to buckle to the mounting rail. Please refer to Figure 2 、 Figure 6 as well as Figure 7 The mounting clip 6 is connected to the rear ends of the main unit 1 and the expansion module 2, and is vertically recessed in the rear ends of the main unit 1 and the expansion module 2. This allows the mounting rail to be hidden after the main unit 1 and the expansion module 2 are mounted on the mounting rail. This concealed design reduces the installation space required for the PLC controller 1000 within the control cabinet and prevents dust and other debris from entering the PLC controller 1000 through the mounting clip 6, thereby ensuring the normal operation of the PLC controller 1000. In this embodiment, the mounting rail adopts a DIN 35mm standard rail. During installation, the main unit 1 and the expansion module 2 are installed by snapping the mounting portion 61 onto the mounting rail. This improves the convenience of installing the PLC controller 1000. In addition, to facilitate the assembly and disassembly of the expansion module 2, in this embodiment, the openings of the first slide rails at the upper and lower ends between the host 1 and the first expansion module 2 are oriented in opposite directions. This ensures stability between the two and facilitates the subsequent addition of expansion modules 2. Starting from the second expansion module 2, the openings of the first slide rails between the first expansion module 2 and the second expansion module 2 are oriented in the same direction, both facing upward. This facilitates the assembly and disassembly of the expansion module 2. For example, if a certain expansion module 2 needs to be removed from the mounting rail during subsequent maintenance, it is only necessary to lift the expansion module 2 upward to disengage the mounting clip 6 from the mounting rail. This facilitates the subsequent integration of the expansion module 2 in the PLC controller 1000.

[0042] In an alternative embodiment, please refer to Figures 3 to 7The host 1 includes a first shell 11, a second shell 12, a box cover 13 and a main board 14. The first shell 11, the second shell 12 and the box cover 13 are detachably connected and enclose a first installation cavity. The main board 14 is installed in the first installation cavity. The second shell 12 and the box cover 13 are located on opposite sides of the first shell 11. The expansion module 2 is provided with an expansion main board 23. Multiple expansion female sockets 51 and multiple expansion male sockets 52 are respectively provided on both sides of the main board 14 and the expansion main board 23. The expansion module 2 slides to a preset position relative to the host 1 so that an expansion female socket 51 on the main board 14 cooperates with an expansion male socket 52 on the expansion main board 23 to achieve electrical connection; the first connecting portion 31 is provided on the second shell 12. The expansion module 2 also includes a third housing 21, a fourth housing 22, and IO terminals 24. The third and fourth housings 21 and 22 together form a second mounting cavity, in which the expansion mainboard 23 is mounted. The female expansion socket 51 on the expansion mainboard 23 is exposed through the fourth housing 22, while the male expansion socket 52 on the expansion mainboard 23 is exposed through the third housing 21. The IO terminals 24 are located at the junction between the third and fourth housings 21 and 22; the male expansion socket 52 is located on the expansion mainboard 23 and exposed through the third housing 21. This modular design allows the mainframe 1 and expansion module 2 to flexibly add or remove functional modules based on actual needs, improving system scalability. Furthermore, the detachable connection simplifies maintenance, as users can easily replace or upgrade the mainboard 14 and other components without having to replace the entire mainframe 1 and expansion module 2. This design also helps improve system reliability, as the modular structure prevents the failure of a single component from affecting the entire system, facilitating quick replacement and repair. Furthermore, the modular structure prevents the entire system from being paralyzed due to the failure of a single component, thereby enhancing system security. In this embodiment, two covers 13 are provided and are detachably connected to one side of the first housing 11, so that the covers 13 can be opened to install expansion cards, such as DIO expansion cards, AIO expansion cards, or communication cards, in the first installation cavity, and to facilitate subsequent inspection and maintenance. In addition, to facilitate the electrical connection and communication connection between the host 1 and the expansion module 2, multiple expansion female sockets 51 are provided on the mainboard 14 and exposed in the second housing 12, and corresponding expansion male sockets 52 are provided on the expansion mainboard 23 and protrude from the third housing 21. In this way, when the expansion module 2 is installed, the expansion female sockets 51 and the expansion male sockets 52 are connected and matched by sliding the expansion module 2 relative to the host 1, thereby achieving electrical connection between the two.

[0043] In addition, the IO terminal 24 on the expansion module 2 is inserted into the side ends of the third shell 21 and the fourth body through the clips at the upper and lower ends, realizing the pluggable design of the IO terminal 24 and the main body of the expansion module 2. On the one hand, setting the IO terminal 24 on the side end of the expansion module 2 is conducive to reducing the thickness of the expansion module 2. On the other hand, the pluggable design also simplifies its wiring structure, reducing the difficulty and error rate of wiring.

[0044] In summary, through the structure of the host 1 and the expansion module 2 in this embodiment, the integration of the expansion module 2 is achieved, and the wiring structure between the host 1 and the expansion module 2 is greatly simplified, which helps to reduce the thickness of the host 1 and the expansion module 2 and reduce the overall volume of the PLC controller 1000. In this way, while maintaining the same volume as the existing PLC controller 1000, more expansion modules 2 can be integrated on the host 1. In this embodiment, through modular design and a unique connection structure, the installation space required to install an expansion module 2 is only 1 / 3 of the original space, and 31 expansion modules 2 can be integrated and installed on a host 1, realizing a lightweight design of the PLC controller 1000. This design also helps to improve the reliability of the system. The modular structure ensures that the failure of a single component will not affect the entire system, which facilitates rapid replacement and maintenance, and can also prevent the paralysis of the entire system due to the failure of a single component.

[0045] Further, when installing expansion module 2, please refer to Figure 1 、 Figure 3 as well as Figure 5 , to ensure a one-to-one correspondence between the expansion female seat 51 and the expansion male seat 52, the second shell 12 is formed with a plurality of guide grooves 121, and the guide grooves 121 are arranged along the extension direction of the expansion module 2, and one guide groove 121 corresponds to one expansion female seat 51. The use of the guide grooves 121 simplifies the installation process of the expansion female seat 51 and the expansion male seat 52, so that the expansion male seat 52 on the expansion module 2 can slide one-to-one along the extension path of the guide grooves 121 until it corresponds to the expansion female seat 51. Ensure the stability of the electrical connection between the host 1 and the expansion module 2, and reduce signal transmission problems caused by poor contact. In addition, the design of the guide grooves 121 also helps to improve the reliability of the system, prevent the expansion module 2 from offsetting during the installation process, thereby avoiding possible connection errors. Similarly, when more expansion modules 2 are subsequently added and integrated, the connection between two adjacent expansion modules 2 is achieved through the cooperation of the expansion female seat 51 and the expansion male seat 52. The same installation method is also used to connect it to the side wall of the previous expansion module 2 to achieve electrical connection between the expansion modules 2, which will not be repeated here.

[0046] In an optional embodiment, to achieve shielding and protection of the expansion socket 51, the PLC controller 1000 further includes a cover 7, which cooperates with the first connecting portion 31 and covers the expansion socket 51. In this embodiment, the cover 7 corresponds to the first slide rails on the host 1 and the expansion module 2 to achieve a slidable cover for the expansion socket 51 exposed on the outside. When the PLC controller 1000 has only one host 1, the expansion socket 51 on the host 1 is exposed to the outside. At this time, the cover 7 can be installed on the host 1 to protect the host 1. When one or more expansion modules 2 are connected to the host 1, the expansion socket 51 on the host 1 and the expansion male socket 52 on the corresponding expansion module 2 are matched to be in a hidden state, and the expansion socket 51 on the outermost expansion module 2 is in an exposed state and is shielded and protected by the cover 7 to prevent external dust or other debris from entering the expansion module 2 and affecting its normal operation. The use of cover 7 helps protect the internal electrical connections of the main unit 1 and expansion module 2 from environmental factors, thereby extending the service life of the entire PLC controller 1000. Furthermore, cover 7 prevents short circuits or other electrical failures caused by accidental contact, improving system safety and ensuring a neat and tidy appearance. By covering the internal connections, cover 7 makes the entire system look more professional and neat.

[0047] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A PLC controller, characterized in that: include: A host, wherein a side wall of the host is provided with a first connecting portion; An expansion module, wherein the expansion module is slidably connected to one side of the host; A connecting component includes a first connecting part and a second connecting part. The side wall of the host is provided with the first connecting part, and the two opposite side walls of the expansion module are respectively provided with the first connecting part and the second connecting part. The second connecting part on the expansion module slides with the first connecting part on the host, and the first connecting parts on both sides of the expansion module slide with the second connecting parts accordingly.

2. The PLC controller according to claim 1, wherein: The host is provided with the first connecting parts at both upper and lower ends, and each expansion module is provided with a second connecting part at both upper and lower ends corresponding to the first connecting parts.

3. The PLC controller according to claim 2, characterized in that: The first connecting portion is a first slide rail, and the second connecting portion is a second slide rail.

4. The PLC controller according to any one of claims 1 to 3, characterized in that: The PLC controller also includes a limit assembly, which includes a first limit part and a second limit part. The host is provided with at least one first limit part, and the first limit part and the first connecting part are located on the same side wall. The opposite side walls of the expansion module are respectively provided with a first limit part and a second limit part, and the second limit part and the second connecting part on the expansion module are located on the same side wall. When the expansion module slides to a preset position relative to the host, the first limit part and the second limit part cooperate to limit the relative movement of the host and the expansion module.

5. The PLC controller according to claim 4, characterized in that: The first limiting portion is one of a limiting protrusion and a limiting groove, and the second limiting portion is another structure.

6. The PLC controller according to claim 5, characterized in that: The PLC controller also includes a mounting clip, which is arranged on the side wall of the host / the expansion module adjacent to the second connecting part. The mounting clip is provided with a mounting part on the side facing away from the host / the expansion module, and the mounting part is used to buckle to the mounting guide rail.

7. The PLC controller according to claim 1, characterized in that: The host includes a first shell, a second shell, a box cover, and a mainboard. The first shell, the second shell, and the box cover are detachably connected and enclose a first installation cavity. The mainboard is installed in the first installation cavity. The second shell and the box cover are located on opposite sides of the first shell. The expansion module is provided with an expansion mainboard. A plurality of expansion female sockets and a plurality of expansion male sockets are respectively provided on both sides of the mainboard and the expansion mainboard. The expansion module slides to a preset position relative to the host so that one of the expansion female sockets on the mainboard cooperates with one of the expansion male sockets on the expansion mainboard to achieve electrical connection. The first connecting portion is provided on the second shell.

8. The PLC controller according to claim 7, characterized in that: The expansion module further includes a third housing, a fourth housing, and an IO terminal. The third housing and the fourth housing together form a second mounting cavity. The expansion mainboard is mounted in the second mounting cavity. The expansion female socket on the expansion mainboard is exposed in the fourth housing. The expansion male socket on the expansion mainboard is exposed in the third housing. The IO terminal is provided at the connection portion between the third housing and the fourth housing. The expansion socket is arranged on the expansion mainboard and exposed in the third shell.

9. The PLC controller according to claim 8, characterized in that: The second shell is formed with a plurality of guide grooves, and the guide grooves are arranged along the extension direction of the expansion module, and one guide groove corresponds to one expansion female seat.

10. The PLC controller according to claim 8, characterized in that: The PLC controller further includes a cover, which cooperates with the first connecting portion and covers the extended female seat.

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