CN215599540U - Programmable logic controller and automation equipment - Google Patents

Abstract

The utility model provides a programmable logic controller and automation equipment, wherein the programmable logic controller comprises a front shell, a rear shell matched with the front shell to form an accommodating cavity, a circuit module arranged in the accommodating cavity, at least one Ethernet interface connected with the circuit module and a self-defined expansion bus interface; the Ethernet interface extends and exposes to a hollow hole arranged on the front shell; the user-defined expansion bus interface extends to and exposes to a hollow hole formed in the front shell, so that the user-defined expansion bus interface and the Ethernet interface are connected with external equipment through the hollow hole. Because the self-defined expansion bus interface is additionally arranged on the programmable logic controller to expand a small number of I/O interfaces, the cost can be reduced, and the occupied space is small.

Description

Programmable logic controller and automation equipment

Technical Field

The embodiment of the utility model relates to the field of controllers, in particular to a programmable logic controller and automation equipment.

Background

Programmable Logic Controllers (PLCs) are digital arithmetic-operating electronic systems designed specifically for use in industrial environments. It uses a programmable memory, in which the instructions for implementing logical operation, sequence control, timing, counting and arithmetic operation are stored, and utilizes digital or analog input and output to control various mechanical equipments or production processes.

On site, the number of input/output interfaces (I/O interfaces) of the PLC host is insufficient. To deal with this situation, the I/O interface is typically extended in the form of a separate expansion module. For the user only needs to expand a small number of I/O interfaces, if an independent expansion module is selected, the cost is higher.

SUMMERY OF THE UTILITY MODEL

The utility model provides a programmable logic controller and automation equipment, and mainly solves the technical problem that the existing scheme for expanding the number of I/O interfaces in an independent expansion module mode has high cost.

In order to solve the above technical problem, the present invention provides a programmable logic controller, including:

the circuit module comprises a front shell 10, a rear shell 20 matched with the front shell 10 to form an accommodating cavity, and a circuit module arranged in the accommodating cavity;

the programmable logic controller also comprises at least one Ethernet interface 104 connected with the circuit module and a serial peripheral interface custom expansion bus interface 102 connected with the circuit module;

wherein, the ethernet interface 104 extends to expose to a hollow hole provided on the front case 10; the custom expansion bus interface 102 extends to and is exposed to a hollow hole formed in the front case 10, so that the custom expansion bus interface 102 and the ethernet interface 104 are connected to an external device through the hollow hole.

Optionally, the programmable logic controller further includes a memory card interface 103 connected to the circuit module; the circuit module is provided with a circuit board which is vertical to the circuit module; the memory card interface 103 is fixed on the circuit board in parallel; the memory card interface 103 is perpendicular to the circuit module through the circuit board, and extends to a hollow hole formed in the front case 10.

Optionally, a first cover plate 111 is further disposed on the front case 10, and the first cover plate 111 is configured to cover the customized expansion bus interface 102 and/or the memory card interface 103.

Optionally, the first cover plate 111 is disposed in a plug-in manner or a hinge-type manner with the front case 10; the first cover plate 111 is further provided with a crescent cover opening.

Optionally, the plc further includes a BD board connector connected to the circuit module, and the BD board connector extends to expose to a hollow hole provided on the front housing 10.

Optionally, a second cover plate 112 is disposed on the front case 10 for covering the BD plate connection port; or the BD board connection port is connected to a BD board, and a second cover plate 112 is provided on the front case 10 to cover the BD board.

Optionally, a connection port 101 connected to the BD plate body is disposed on the BD plate, and the connection port is exposed to the outside through an abdication port disposed on the second cover plate 112, wherein a first acute angle is formed between the projection in the exit hole direction of the connection port 101 and the BD plate body, and the range of the first acute angle is 5-85 degrees.

Optionally, the programmable logic controller further includes a row of input terminals 105 and a row of output terminals 106 connected to the circuit module; the row of input terminals 105 and the row of output terminals 106 are provided at both ends of the front case 10 in the width direction, respectively.

Optionally, the programmable logic controller further includes a communication interface 107 connected to the circuit module; the communication interface 107 comprises at least one of an RS232 communication interface and an RS485 communication interface; the RS232 communication interface extends to a hollow hole provided above or on the side of the front case 10; the RS485 communication interface extends to a hollow hole formed above or on a side surface of the front case 10.

Optionally, the programmable logic controller further includes a display unit connected to the circuit module, and the display unit is one or more of a plurality of LED lamps, a digital tube, and a liquid crystal display.

Optionally, at least one of a third cover plate, a fourth cover plate 114, a fifth cover plate 115, a sixth cover plate 116 and a seventh cover plate 117 is further disposed on the front case 10;

the third cover plate is used for covering the Ethernet interface;

the fourth cover plate 114 is used for covering a row of input terminals;

the fifth cover plate 115 is used to cover a row of output terminals;

the sixth cover plate 116 is used for covering the RS232 communication interface or the RS485 communication interface;

the seventh cover plate 117 is used to cover the display unit.

Optionally, at least one cover plate on the front case 10 is made of a transparent material or a semitransparent material.

Optionally, a battery box 202 for placing a battery is disposed on a side surface of the rear case 20.

Based on the same inventive concept, the utility model also provides an automation device, and the automation device comprises any one of the programmable logic controllers.

According to the programmable logic controller and the automation equipment provided by the utility model, the programmable logic controller comprises a front shell, a rear shell matched with the front shell to form a containing cavity, a circuit module arranged in the containing cavity, at least one Ethernet interface connected with the circuit module and a self-defined expansion bus interface; the Ethernet interface extends and exposes to a hollow hole arranged on the front shell; the user-defined expansion bus interface extends to and exposes to a hollow hole formed in the front shell, so that the user-defined expansion bus interface and the Ethernet interface are connected with external equipment through the hollow hole. Because the self-defined expansion bus interface is additionally arranged on the programmable logic controller to expand a small number of I/O interfaces, the cost can be reduced, and the occupied space is small.

Additional features and corresponding advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

Fig. 1-1 is a perspective view of a programmable logic controller according to an embodiment of the present invention;

fig. 1-2 are another perspective views of a programmable logic controller according to an embodiment of the present invention;

FIG. 2 is a perspective view of another programmable logic controller provided in accordance with an embodiment of the present invention;

FIG. 3 is a perspective view of another programmable logic controller provided in accordance with an embodiment of the present invention;

FIG. 4 is a perspective view of another programmable logic controller provided in accordance with an embodiment of the present invention;

FIG. 5-1 is a perspective view of another programmable logic controller provided in accordance with an embodiment of the present invention;

FIG. 5-2 is a top view of another programmable logic controller provided in accordance with an embodiment of the present invention;

fig. 5-3 are bottom views of alternative programmable logic controllers provided by embodiments of the present invention;

FIGS. 5-4 are left side views of alternative programmable logic controllers provided by embodiments of the present invention;

FIGS. 5-5 are right side views of alternative programmable logic controllers provided in accordance with embodiments of the present invention;

FIGS. 5-6 are rear views of alternative programmable logic controllers provided in accordance with embodiments of the present invention;

fig. 6 is a schematic diagram illustrating a connection between a rail clip and a card socket in another programmable logic controller according to an embodiment of the present invention;

description of reference numerals:

10-a front housing; 20-a rear housing; 101-connection port; 102-custom expansion bus interface; 103-memory card interface; 104-ethernet interface; 105-an input terminal; 106-output terminal; 107 — a communication interface; 111-a first cover plate; 112-a second cover plate; 114-a fourth cover plate; 115-a fifth cover plate; 116-a sixth cover plate; 117-seventh cover plate; 201-heat dissipation grid; 202-a battery box; 203-guide rail buckle; 204-card seat; 205-screw mounting holes.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Examples of the utility model

Aiming at the problem of poor stability of the existing scheme of expanding the number of I/O interfaces by additionally arranging an Ethernet expansion interface, the utility model provides the programmable logic controller, the programmable logic controller is provided with a self-defined expansion bus interface, a small number of I/O interfaces can be expanded, the cost is low, the occupied space is small, and the requirement that a user only needs to expand a small number of I/O interfaces is also met.

Referring to fig. 1, the program logic controller provided in this embodiment includes: the circuit board comprises a front shell 10, a rear shell 20 matched with the front shell 10 to form a containing cavity, a circuit module arranged in the containing cavity, at least one Ethernet interface 104 connected with the circuit module and a self-defined expansion bus interface 102; wherein, the ethernet interface 104 extends to expose to a hollow hole provided on the front case 10; the custom expansion bus interface 102 extends to and is exposed to a hollow hole formed in the front case 10, so that the custom expansion bus interface 102 and the ethernet interface 104 are connected to an external device through the hollow hole.

It should be noted that the ethernet interface is used for applications that can implement various combined functions through network protocols (including but not limited to MODBUS-TCP/IP protocol). For example, the ethernet interface is used to provide a connection interface for connecting with an external network remote online monitoring device or a network connection device. The number of the ethernet interfaces is not further limited in this embodiment, and can be set reasonably according to actual requirements. As an example, as shown in fig. 3 and 4, the plc includes an ethernet interface 104 exposed to the outside through a hollow hole formed in the front housing. As another example, as shown in fig. 1-1, 1-2, and 5-1, the plc includes two ethernet interfaces 104 disposed adjacently, and the two ethernet interfaces are exposed to the outside through hollow holes disposed on the front housing. When the two modes are adopted, the Ethernet interfaces are exposed outside, so that a user can conveniently know which position on the host computer of the programmable logic controller is provided with the Ethernet interface, and the user can conveniently know how many Ethernet interfaces are arranged on the host computer of the programmable logic controller. As yet another example, the programmable logic controller includes two ethernet interfaces adjacently disposed, the two ethernet interfaces extending to a hollow hole disposed on the front housing; the front shell is also provided with a cover plate for covering the two Ethernet interfaces; the cover plate can play a role in protecting or preventing dust for the Ethernet interface and can also improve the aesthetic property of the programmable logic controller.

In order to increase the I/O number of the programmable logic controller, an expansion module, such as a custom expansion bus interface, can be arranged on the programmable logic controller. Types of the custom expansion bus include, but are not limited to, parallel bus and serial bus; if a parallel bus is adopted, the self-defined expansion bus interface can be called as a parallel interface; if a serial bus is used, the custom expansion bus interface may be referred to as a serial interface. Wherein, the parallel bus can be any one of STD, PC bus and IEEE488 bus; the serial bus may be any one of I2C, SPI, RS232, UART, and USB. In addition, the customized expansion bus interface and the PLC host are fixed in various manners, including but not limited to, fixing the customized expansion bus interface on the PLC host by using a direct plug-in connection manner or a flat cable connection manner.

However, the specific type and number of the custom expansion bus interfaces in this embodiment are not limited, and may be reasonably selected according to actual requirements. For example, the self-defined expansion bus interface is an SPI interface, and the SPI interface may be a flat cable plug type SPI bus interface, an SPI backplane bus interface, and a flat cable male-female plug type SPI interface. When the mode is adopted, the SPI interface adopts a full-duplex mode, the communication starting is faster, the real-time performance is better, and the stability is better. Compared with the Ethernet expansion interface, the mode is firmer and has stronger stability, and even if the field vibration is encountered, the communication can still be stably carried out. Optionally, a cover plate is further arranged on the front shell and used for covering the SPI interface, so that the SPI interface is protected or prevented from dust, and the attractiveness of the programmable logic controller can be improved.

In some embodiments, the programmable logic controller is further provided with a memory card interface, the memory card interface is a memory card slot, and the memory card slot can support the insertion of a standard memory card; so as to realize the storage of the target program in the memory card and the downloading of the user program from the computer terminal to the programmable logic controller program through the memory card. In addition, the memory card interface can be arranged in parallel or perpendicular to the power module. As an example, the memory card interface is attached in parallel to the control circuit board in the power module, and the memory card interface extends to a hollow hole provided on a side surface of the front housing. As another example, a circuit board is disposed on the control circuit board and perpendicular to the control circuit board, and the memory card interface is disposed perpendicular to the control circuit board through the circuit board and extends to a hollow hole disposed above the front housing. Compared with the memory card interface which is arranged in parallel, the occupied area of the memory card interface on the control circuit board can be reduced when the memory card interface is arranged vertically. Optionally, the front housing is further provided with a cover plate for covering the memory card interface, so as to protect the memory card interface or prevent dust, and improve the aesthetic property of the programmable logic controller.

Referring to fig. 1-1, in the present embodiment, the plc includes a vertically disposed memory card interface 103 and a custom expansion bus interface 102. A first cover plate 111 is also provided on the front housing for concealing the memory card interface 103 and the custom expansion bus interface 102 for dust protection and to enhance the aesthetic appearance of the plc. Meanwhile, in the embodiment, the connection manner between the first cover plate and the front housing is not limited. By way of example, the first cover plate is arranged on the front housing by means of a snap-in or plug-in or hinge connection. The clamping type or plug-pull type connection mode belongs to a fixed connection mode; the hinged connection mode belongs to a movable connection mode. Specifically, when the first cover plate is movably connected with the front shell, the first cover plate can rotate around the side movably connected with the front shell. In addition, still be equipped with crescent type opening cover mouth on the first apron to first apron and procapsid separation or first apron carry out the motion that opens and shuts on the casing in the front.

In some embodiments, the programmable logic controller further comprises a BD board connector for connecting to a circuit module, the BD board connector extending to expose to a hollow hole provided on the front housing. Optionally, a second cover plate is arranged on the front housing to cover the BD plate connection port; or the BD plate connecting port is connected with the BD plate, and a second cover plate is arranged on the front shell and used for covering the BD plate. The BD plate is provided with a connector connected with the BD plate body, the connector is exposed outside through a yielding hole formed in the second cover plate, a first acute angle is formed between the projection in the outlet hole direction of the connector and the BD plate body, and the first acute angle ranges from 5 degrees to 85 degrees.

Specifically, the circuit module comprises a power circuit board, a driving circuit board and a control circuit board which are sequentially connected. The control circuit board is provided with a BD board connecting port for connecting with a BD board. Referring to fig. 1-1 and 1-2, when the BD board is not needed according to the actual needs of the user, a cover plate may be added on the front case to cover the BD board connection port in view of dust prevention and aesthetic property. Referring to fig. 2, if the user needs to use the BD board, the BD board needs to be inserted into a corresponding interface on the control circuit board of the plc host and fixed with the plc host to implement communication between the BD board and the plc host. In this process, the BD board and the plc host may be fixed in various manners, including but not limited to, mounting the BD board on the plc host by using a screw fixing manner or a snap fixing manner. And then covering a square plate (namely, a second cover plate 112 in fig. 2) on the programmable logic controller host. The square plate is provided with an abdication port, and the BD plate is provided with a connector 101 connected with the BD plate body, and the connector is exposed outside through the abdication port. In addition, the outlet direction of the connecting port can be flexibly adjusted, for example, the projection of the outlet direction of the connecting port forms an acute angle with the BD plate body, and the acute angle ranges from 5 degrees to 85 degrees. However, by adding a BD board to the programmable logic controller, the number of I/0 interfaces on the programmable logic controller can also be increased. Therefore, in the actual field, if a user needs to debug, needs to connect a touch screen, needs to connect the ethernet or needs to connect a third-party frequency converter or a third-party driver, the added BD board can provide more communication ports for the application field. At this time, the user connects the signal line of the external device to the connection port on the BD board by wire connection; external signals can be converted into electric signals through the BD plate, so that the collection and output conversion with the programmable logic controller host are realized; the external signal includes, but is not limited to, digital quantity, analog quantity, and communication signal.

In some embodiments, the programmable logic controller further comprises a row of input terminals and a row of output terminals connected to the circuit module. The row of input terminals and the row of output terminals are provided at both ends of the front case in the width direction, respectively. It is understood that the input terminal and the output terminal are interfaces for connecting the plc host to the outside, that is, connection parts between the CPU and the field I/O device or other external devices. In addition, the number of the terminals in the row of input terminals and the row of output terminals is not limited in this embodiment, and can be set reasonably according to actual requirements. Meanwhile, the number of terminals of the row of input terminals and the number of terminals of the row of output terminals may be equal or unequal. As an example, a row of input terminals is provided at the upper end of the front case, and a row of output terminals is provided at the lower end of the front case, while the number of terminals of the row of input terminals is larger than the number of terminals of the row of output terminals. As another example, a row of output terminals is provided at the upper end of the front case, and a row of input terminals is provided at the lower end of the front case, while the number of terminals of the row of input terminals is smaller than the number of terminals of the row of output terminals.

In some embodiments, the programmable logic controller further comprises a communication interface connected to the circuit module. The communication interface is used for providing an interface for networking communication between the programmable logic controller host and an external device. The present embodiment does not limit the type, number, and the like of the communication interfaces, and a certain type of communication interfaces and a suitable number of communication interfaces may be specifically selected according to actual requirements. By way of example, the type of the communication interface set on the programmable logic controller includes at least one of an RS232 communication interface, an RS422 communication interface, and an RS485 communication interface; meanwhile, the number of the communication interfaces arranged on the programmable logic controller comprises one, two or four, etc.

In some embodiments, the programmable logic controller further comprises a display unit connected to the circuit module. The display unit adopts one or more of a plurality of LED lamps, a nixie tube and a liquid crystal display screen. Optionally, a cover plate is additionally arranged on the front shell to cover the display unit; and the cover plate is provided with a display area corresponding to the display unit. As an example, the display unit includes a plurality of indicator lights, and particularly, the indicator lights can be used as light emitting diodes or nixie tubes; correspondingly, the display area arranged on the cover plate is used for displaying the light emitted by each indicator light.

Referring to fig. 5-1 and 5-2, the programmable logic controller of the present embodiment includes a row of input terminals 105, a row of output terminals 106, and a communication interface 107 (including an RS232 communication interface and an RS485 communication interface) connected to the circuit module. Wherein the row of input terminals is disposed at an upper end of the front case and the row of output terminals is disposed at a lower end of the front case; and the number of terminals in the row of output terminals is smaller than the number of terminals in the row of input terminals. And the one RS232 communication interface and the one RS485 communication interface are at the same end as the row of output terminals. And RS232 communication interface extends to the fretwork hole that the procapsid top set up, and RS485 communication interface extends to the fretwork hole that the procapsid side set up.

Further, in order to protect the terminals, the interfaces, and other elements on the PLC host, in this embodiment, a fourth cover plate 114, a fifth cover plate 115, a sixth cover plate 116, and a seventh cover plate 117 are further disposed on the PLC controller. Wherein the fourth cover plate 114 is used for covering the row of input terminals 105; the fifth cover plate 115 is used to cover the row of output terminals 106; the sixth cover plate 116 is used for covering the RS232 communication interface; the seventh cover plate 117 is used to cover the display unit.

Further, in order to facilitate the user to know which type of port or interface is disposed at which position of the plc, the fourth cover plate 114, the fifth cover plate 115, and the sixth cover plate 116 in this embodiment may be made of a transparent material or a semi-transparent material. Of course, any cover plate arranged on the programmable logic controller can be made of transparent materials or semitransparent materials, and can be flexibly arranged according to actual requirements.

However, in other embodiments, the RS485 communication interface may also extend to a hollow hole disposed above the front housing, and the RS232 communication interface may also extend to a hollow hole disposed on a side surface of the front housing. Meanwhile, a fourth cover plate and an eighth cover plate are also arranged on the programmable logic controller; the fourth cover plate is used for covering a row of input terminals; the eighth apron is used for covering a row of output terminal and RS232 communication interface, or the eighth apron is used for covering a row of output terminal and RS485 communication interface.

In some embodiments, as shown in fig. 5-2, a battery compartment 202 is disposed on one side of the rear housing of the plc, and the battery compartment 202 can be used for placing several button batteries.

In some embodiments, a heat dissipation grid 201 is disposed on at least one side of a rear housing in the programmable logic controller. Referring to fig. 5-2, 5-3, 5-4, and 5-5, in the present embodiment, each side of the rear housing is provided with a heat dissipation grid 201. The heat dissipation grid 201 includes a plurality of strip-shaped hole heat dissipation grids arranged in parallel and at equal intervals. The heat dissipation grid is arranged, so that the heat inside the programmable logic controller can be discharged to the outside air, the temperature in the programmable logic controller is effectively reduced, and the service life of the programmable logic controller is favorably ensured.

In some embodiments, at least two rail clips are arranged on the bottom surface of the rear shell in the programmable logic controller. The programmable logic controller can be installed on a wall or other equipment by arranging the guide rail buckle.

Referring to fig. 5-6, in the embodiment, two rail fasteners 203 and two clamping seats 204 are disposed on the bottom surface of the rear housing. The rail clip 203 includes two hooks extending from the upper end of the rail clip body, and the two hooks are used for being attached to the clip seat 204 on the rear housing, and generally, the two hooks are symmetrically attached to two sides of the clip seat. Specifically, the cross section of the clamping seat 204 is hexagonal, and at this time, the side surface of the clamping seat 204 includes a first set of abutting surfaces and a second set of abutting surfaces, and the two hooks in the guide rail buckle 203 can be symmetrically arranged on the first set of abutting surfaces or the second set of abutting surfaces of the clamping seat.

It should be understood that, in order to make the programmable controller more stably installed on other objects, the number of the rail fasteners can be increased appropriately. In other embodiments, four rail fasteners and two clamping seats are arranged on the bottom surface of the rear shell. The cross section of the clamping seat is hexagonal, and the side face of the clamping seat comprises a first group of binding faces and a second group of binding faces. Referring to fig. 6, two rail fasteners are connected to a card holder; two clamping hooks in one guide rail clamping buckle are symmetrically arranged on a first binding surface of the clamping seat; two hooks in the other guide rail fastener are symmetrically arranged on the second binding surface of the clamping seat.

In this embodiment, please refer to fig. 5-6, the rear housing of the programmable controller is further provided with a mounting component, which includes a screw mounting hole 205; so that the programmable controller can also be fixedly mounted on a wall or other equipment by means of the mounting means. In addition, in order to secure the fixing more firmly, the diameter and depth of the screw mounting hole may be increased appropriately.

For a better understanding of the present invention, a preferred editable logic controller in this embodiment is further described below in conjunction with FIGS. 5-1-5-6:

the editable logic controller comprises a housing and a circuit module disposed within the housing. Wherein the housing is composed of an upper housing 10 and a lower housing 20 which are matched with each other to form a receiving cavity.

The editable logic controller also comprises various interfaces or terminals and other elements connected with the circuit module.

In particular, the editable logic controller comprises two ethernet interfaces 104 to enable networked communication with external devices. Correspondingly, two hollowed holes matched with the Ethernet interfaces in size are formed in the upper portion of the front shell, and the two Ethernet interfaces respectively extend to the hollowed holes in the upper portion of the front shell and are exposed outside. By adopting the setting mode, a user can conveniently and quickly know the specific position of the programmable logic controller where the Ethernet interface is arranged and the specific number of the Ethernet interfaces.

Specifically, the editable logic controller comprises a BD board to realize the purpose of expanding the number of input and output interfaces in the editable logic controller with lower cost. The BD board is inserted into an interface arranged on the power module to realize the communication between the BD board and the host. Correspondingly, a first extended area cover plate is arranged above the front shell to cover the BD plate, so that the BD plate is protected, and meanwhile, the attractiveness of the editable logic controller is improved. The BD plate includes a BD plate body and a connection port 101 to which the BD plate body is connected; the acute angle formed by the projection in the outlet direction of the connecting port and the BD plate body ranges from 5 degrees to 85 degrees. The first extended area cover plate is provided with an abdication port, the size of the abdication port is matched with that of the connector, and the connector on the BD plate can be exposed to the outside through the abdication port, so that a user can connect a signal wire of external equipment to the connector on the BD plate in a wiring mode, and the purposes of converting an external signal into an electric signal through the BD plate, realizing acquisition and output conversion with a host and the like are achieved.

In particular, the editable logic controller comprises a display unit. The display unit is composed of a plurality of rows of indicator lamps. Correspondingly, a display area cover plate is arranged above the front shell to cover the display unit. And the display area cover plate is provided with a display area corresponding to each row of indicator lamps and used for displaying the light emitted by each indicator lamp.

Specifically, the editable logic controller comprises a memory card interface and an SPI interface. The memory card interface comprises a memory card slot which can support the insertion of a standard memory card; so as to realize the storage of the target program in the memory card and the downloading of the user program from the computer terminal to the programmable logic controller program through the memory card. The memory card interface adopts a vertical arrangement mode to reduce the occupied area of the memory card interface on the control circuit board. Specifically, the control circuit board is provided with a circuit board which is perpendicular to the control circuit board, and the memory card interface is perpendicular to the control circuit board through the circuit board and extends to the hollow hole formed in the upper portion of the front shell. Wherein, this SPI interface adopts the form of public first contact pin to install on control circuit board to extend to the fretwork hole that the procapsid top set up. Meanwhile, the external equipment is provided with a flat cable female plug, and when the external equipment is installed on site, the external equipment is inserted into the SPI interface. That is, the number of I/O interfaces on the programmable logic controller can be increased by additionally arranging an SPI interface on the programmable logic controller; simultaneously, compare in current ethernet extension mode, owing to there is winding displacement plug formula SPI bus extension, the communication starts sooner, and the real-time is better, and stability is better. In addition, the front shell body is further provided with a second expansion area cover plate above to cover the storage card interface and the SPI interface. The second extended area cover plate can not only prevent dust from being deposited on the interface, but also prevent the interface from being exposed, and the attractiveness of the programmable logic controller is improved. Meanwhile, a crescent cover opening used for opening and closing is arranged on the second extension area cover plate.

Specifically, the editable logic controller includes a row of input terminals 105 provided at the upper end of the front housing, a row of output terminals 106 provided at the lower end of the front housing, and a communication interface 107; wherein, the communication interface 107 comprises an RS232 communication interface and an RS485 communication interface; the RS232 communication interface extends to a hollow hole formed in the upper portion of the front shell, and the RS485 communication interface extends to a hollow hole formed in the side face of the front shell. In addition, an input wiring terminal cover plate, an output wiring cover plate and a communication interface cover plate are arranged above the front shell; the input terminal cover plate is used for covering the row of input terminals, the output terminal cover plate is used for covering the row of output terminals, and the communication interface cover plate is used for covering the RS232 communication interface. Meanwhile, the input wiring terminal cover plate, the output wiring cover plate and the communication interface cover plate are all made of semitransparent materials.

The editable logic controller also comprises two rail clips 203 for mounting the programmable logic controller on other equipment. Specifically, the bottom surface of the rear housing 20 is provided with two rail clips 203; each rail clip 203 comprises two hooks extending from the upper end of the rail clip body, and the two hooks are symmetrically attached to two sides of the card holder 204.

The editable logic controller also includes screw mounting holes 205 for fixedly mounting the programmable logic controller to a wall or other device. Specifically, the two diagonal ends of the bottom surface of the rear housing 20 are respectively provided with a screw mounting hole 205, and the diameter and depth of the screw mounting hole can be reasonably set according to actual requirements.

The programmable logic controller also includes a heat dissipation grid 201 for discharging heat inside the programmable logic controller to the outside air. Specifically, a heat dissipation grid 201 is provided on each side of the rear case 20.

The present embodiment also provides an automation device, which includes any one of the above programmable logic controllers, and is not described herein again. Meanwhile, the automatic equipment comprises automatic equipment applied to various industries such as electronic manufacturing, laser, carving, injection molding mechanical arms, machine tools, logistics, robots, medical treatment and the like.

In summary, the programmable logic controller and the automation device provided by the utility model are provided with the self-defined expansion bus interface and/or the BD board to expand a small number of I/O interfaces by adding the self-defined expansion bus interface and/or BD board to the programmable logic controller, so that the cost is low and the occupied space is small, and the requirement that a user only needs to expand a small number of I/O interfaces is met.

The foregoing is a more detailed description of embodiments of the present invention, and the present invention is not to be considered limited to such descriptions. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.

Claims (14)

1. A programmable logic controller, comprising: the circuit board comprises a front shell (10), a rear shell (20) matched with the front shell (10) to form an accommodating cavity, and a circuit module arranged in the accommodating cavity;

the programmable logic controller also comprises at least one Ethernet interface (104) connected with the circuit module and a serial peripheral interface customized expansion bus interface (102) connected with the circuit module;

wherein the Ethernet interface (104) extends and exposes to a hollow hole arranged on the front casing (10); the custom expansion bus interface (102) extends and exposes to a hollow hole arranged on the front shell (10), so that the custom expansion bus interface (102) and the Ethernet interface (104) are connected with external equipment through the hollow hole.

2. The programmable logic controller of claim 1, further comprising a memory card interface (103) connected to the circuit module; the circuit module is provided with a circuit board which is vertical to the circuit module; the memory card interface (103) is fixed on the circuit board in parallel; the memory card interface (103) is perpendicular to the circuit module through the circuit board and extends to a hollow hole formed in the front shell (10).

3. The programmable logic controller of claim 2, wherein a first cover plate (111) is further disposed on the front housing (10), the first cover plate (111) being configured to cover the custom expansion bus interface (102) and/or the memory card interface (103).

4. A programmable logic controller according to claim 3, characterized in that said first cover plate (111) is either pluggable or hinged to said front housing (10); the first cover plate (111) is further provided with a crescent cover opening.

5. The programmable logic controller of claim 1, further comprising a base unit expansion board BD board connection port connected to the circuit module, the BD board connection port extending exposed to a hollowed-out hole provided on the front housing (10).

6. The programmable logic controller of claim 5, wherein a second cover plate (112) is provided on the front case (10) for covering the BD-plate connection port; or the BD plate connecting port is connected with a BD plate, and a second cover plate (112) is arranged on the front shell (10) and used for covering the BD plate.

7. The PLC of claim 6, wherein the BD plate is provided with a connection port (101) connected to the BD plate body, and the connection port is exposed to the outside through a relief port provided on the second cover plate (112), wherein a projection in an exit direction of the connection port (101) forms a first acute angle with the BD plate body, and the first acute angle ranges from 5 degrees to 85 degrees.

8. The programmable logic controller of claim 1, further comprising a row of input terminals (105), a row of output terminals (106) connected to the circuit module; the row of input terminals (105) and the row of output terminals (106) are respectively provided at both ends of the front case (10) in the width direction.

9. The programmable logic controller of claim 1, further comprising a communication interface (107) connected to the circuit module; the communication interface (107) comprises at least one of an RS232 communication interface and an RS485 communication interface; the RS232 communication interface extends to a hollow hole arranged above or on the side surface of the front shell (10); the RS485 communication interface extends to a hollow hole arranged above or on the side face of the front shell (10) respectively.

10. The programmable logic controller of claim 1, further comprising a display unit coupled to the circuit module, the display unit employing one or more of a plurality of LED lights, a digital tube, and a liquid crystal display.

11. A programmable logic controller according to any of claims 8 to 10, wherein the front housing (10) is further provided with at least one of a third cover plate, a fourth cover plate (114), a fifth cover plate (115), a sixth cover plate (116), a seventh cover plate (117);

the third cover plate is used for covering the Ethernet interface;

the fourth cover plate (114) is used for covering a row of input terminals;

the fifth cover plate (115) is used for covering a row of output terminals;

the sixth cover plate (116) is used for covering the RS232 communication interface or the RS485 communication interface;

the seventh cover plate (117) is used for covering the display unit.

12. The plc of claim 11, wherein at least one cover plate on the front housing (10) is made of a transparent material or a translucent material.

13. The programmable logic controller of claim 1, wherein a battery compartment (202) for holding a battery is provided on a side of the rear case (20).

14. An automation device, characterized in that the automation device comprises a programmable logic controller according to any one of claims 1-13.

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