Redundant cascading chassis for an industrial control system

Abstract

The utility model discloses a kind of redundancy cascading base of industrial control system, it is related to industrial automation control technical field.The redundancy cascading base of industrial control system includes multiple controller slots and multiple input / output module slots set on same circuit board;Controller slot is used to access controller card, and input / output module slot is used to access input / output module card;Each controller slot corresponds to a communication bus, and controller slot is connected to all input / output module slots by corresponding communication bus;When controller card is accessed to controller slot, and input / output module card is accessed to input / output module slot, each controller card can establish communication connection with all input / output module cards by corresponding communication bus.The utility model discloses technical scheme can improve the operation stability of industrial control system.

Description

Technical Field

[0001] This utility model relates to the field of industrial automation control technology, and in particular to a redundant cascade base for an industrial control system. Background Technology

[0002] The base of an industrial control system is an electrical slot base in a distributed control system (DCS) used to insert controller cards. It can realize functions such as bus electrical connection, power distribution, signal input / output, redundant communication, and address identification to ensure stable connection between controller cards and field devices and system bus.

[0003] Currently, in industrial scenarios such as power and chemical industries, DCS systems have extremely high requirements for operational stability and redundancy fault tolerance. However, existing bases mostly adopt a single controller slot design without a redundant backup structure. When the controller fails, it will directly cause the industrial control system to shut down. Moreover, the controller card and input / output module card are often scattered in different independent bases, requiring additional splicing and wiring. This not only occupies a lot of space and is inconvenient for installation and maintenance, but also further reduces the reliability of the system and cannot meet the high stability operation requirements of industrial sites. Utility Model Content

[0004] In view of this, the present invention provides a redundant cascade base for an industrial control system, the main purpose of which is to solve the technical problem of low operational stability of industrial control systems.

[0005] To achieve the above objectives, this utility model first provides a redundant cascade base for an industrial control system, which includes multiple controller slots and multiple input / output module slots disposed on the same circuit board. The controller slot is used to connect a controller card, and the input / output module slot is used to connect an input / output module card. Each controller slot corresponds to a communication bus, and the controller slot is connected to all the input / output module slots through the corresponding communication bus; When the controller card is connected to the controller slot and the input / output module card is connected to the input / output module slot, each controller card can establish a communication connection with all the input / output module cards through the corresponding communication bus.

[0006] In one embodiment of this utility model, the plurality of controller slots include a first controller slot and a second controller slot; the communication bus corresponding to the first controller slot is a first communication bus, and the communication bus corresponding to the second controller slot is a second communication bus; the first controller slot is also electrically connected to the second communication bus, and the second controller slot is also electrically connected to the first communication bus.

[0007] In one embodiment of this utility model, each of the input / output module slots is a universal slot, so that the universal slot can be adapted to analog input module cards, analog output module cards, digital input module cards, digital output module cards, RTD input module cards, and thermocouple input module cards.

[0008] In one embodiment of this utility model, the circuit board of the redundant cascade base of the industrial control system also has a system power interface; the system power interface is connected to each controller slot and each input / output module slot through traces on the circuit board; the system power interface is used to access an external system power supply, to access a system power supply voltage of a first voltage level from the system power supply, and to supply power to the controller card connected to the controller slot and the input / output module card connected to the input / output module slot.

[0009] In one embodiment of this utility model, the circuit board of the redundant cascade base of the industrial control system also has a field power interface; the field power interface is connected to each of the input / output module slots through traces on the circuit board; the field power interface is used to connect to an external field power source, to receive a field power supply voltage of a second voltage level from the field power source, and to supply power to the input / output module cards connected to the input / output module slots, so as to supply power to the field devices connected to the input / output module cards via the input / output module cards.

[0010] In one embodiment of this utility model, the circuit board of the redundant cascade base of the industrial control system also has a communication bus cascade expansion interface, which is used to connect to an input / output module expansion device. The communication bus cascade expansion interface is connected to the controller slot through traces on the circuit board, so that when the controller card is connected to the controller slot and the input / output module expansion device is connected to the communication bus cascade expansion interface, the controller card can establish a communication connection with the input / output module card in the input / output module expansion device.

[0011] In one embodiment of this utility model, the circuit board of the redundant cascaded base of the industrial control system also has a global positioning system (GPS) interface, which is used to connect a GPS receiver module. The GPS interface is connected to the controller slot through a trace on the circuit board, so that when a controller card is connected to the controller slot and the GPS receiver module is connected to the GPS interface, the GPS receiver module can send GPS signals to the controller card.

[0012] In one embodiment of this utility model, the circuit board of the redundant cascade base of the industrial control system further includes multiple hardware address encoders, each corresponding to one of the input / output module slots. The hardware address encoder is used to set the hardware address of the input / output module card connected to the corresponding input / output module slot. The hardware address encoder is connected to the controller slot through traces on the circuit board, so that when the controller card is connected to the controller slot and the input / output module card is connected to the input / output module slot, the controller card can determine the hardware address of the input / output module card through the hardware address set by the hardware address encoder.

[0013] In one embodiment of this utility model, the circuit board of the redundant cascaded base of the industrial control system also has multiple aviation plug network interfaces, which are used to connect to a remote host computer; the controller slot is connected to at least one of the aviation plug network interfaces through the wiring on the circuit board, so that the controller card connected to the controller slot can establish a communication connection with the remote host computer through the aviation plug network interface.

[0014] In one embodiment of this utility model, the circuit board of the redundant cascaded base of the industrial control system also has multiple input / output data interfaces, which are used to connect to external field devices. Each input / output module slot is connected to at least one input / output data interface through a trace on the circuit board, so that when the input / output module card is connected to the input / output module slot and the field device is connected to the input / output data interface, the input / output module card can establish a communication connection with the field device.

[0015] This utility model provides a redundant cascaded base for an industrial control system. By integrating multiple controller slots and multiple input / output module slots onto the same circuit board, and with each controller slot corresponding to an independent communication bus and connected to all input / output module slots, it achieves an integrated layout of controller cards and input / output module cards, reducing the number of independent bases and wiring requirements. At the same time, multiple controller cards can communicate with all input / output module cards through their respective independent buses, forming a controller redundancy backup architecture. When any controller fails, other controllers can seamlessly take over communication to avoid system downtime, thereby significantly improving the operational stability and redundancy fault tolerance of the industrial control system.

[0016] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This illustration shows one of the structural schematic diagrams of a redundant cascade base for an industrial control system provided by an embodiment of the present invention; Figure 2 This is a second schematic diagram of the structure of a redundant cascade base for an industrial control system provided in an embodiment of the present invention; Figure 3 This is the third schematic diagram of the structure of a redundant cascade base for an industrial control system provided in this embodiment of the present invention; Figure 4 The fourth schematic diagram shows the structure of a redundant cascade base for an industrial control system provided in this embodiment of the present invention; Figure 5 This diagram illustrates a form of hardware address provided by an embodiment of the present invention. Figure 6 The fifth schematic diagram shows the structure of a redundant cascade base for an industrial control system provided in this embodiment of the present invention; Figure 7 This diagram illustrates the signal interaction of a redundant cascaded base for an industrial control system according to an embodiment of the present invention. Figure 8 This illustration shows one of the structural schematic diagrams of a circuit board provided in an embodiment of the present invention; Figure 9 The second schematic diagram shows the structure of a circuit board provided in an embodiment of the present invention. Detailed Implementation

[0018] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0019] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the specific implementation methods, structures, features, and effects according to this utility model application are described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0020] The following is combined Figures 1 to 9 This invention describes a redundant cascade base for an industrial control system according to some embodiments of the present invention.

[0021] like Figure 1 As shown, an embodiment of the present invention provides a redundant cascade base for an industrial control system, including multiple controller slots 200 and multiple input / output module slots 300 disposed on the same circuit board 100.

[0022] Specifically, controller slot 200 is used to connect controller cards, and input / output module slot 300 is used to connect input / output module cards. The controller card can be a computer device integrating a controller for a distributed industrial control system, and the input / output module card is a computer device integrating input / output (I / O) modules. Here, the I / O module cards can include analog input module cards, analog output module cards, digital input module cards, digital output module cards, resistance temperature detector (RTD) input module cards, and thermocouple input module cards, etc. Furthermore, all input / output module slots 300 are universal slots to ensure compatibility with the aforementioned I / O module cards.

[0023] Furthermore, each controller slot 200 corresponds to a communication bus 400, and the controller slot 200 is connected to all input / output module slots 300 through its corresponding communication bus 400. The aforementioned communication bus 400 can be a trace on the circuit board 100. Furthermore, when a controller card is connected to a controller slot 200 and an input / output module card is connected to an input / output module slot 300, each controller card can establish a communication connection with all input / output module cards through the communication bus 400 corresponding to the controller slot 200 to which it is connected.

[0024] Specifically, the controller slot 200 has contacts connected to the communication bus 400, and the input / output module slot 300 also has contacts connected to the communication bus 400. When the controller card is connected to the controller slot 200, the pin contact area in the controller card used for communication with the input / output module card is connected to the aforementioned contacts in the controller slot 200. At the same time, when the input / output module card is connected to the input / output module slot 300, the pin contact area in the input / output module card used for communication with the controller card is connected to the aforementioned contacts in the input / output module slot 300, so as to establish a bus communication connection between the controller card and the input / output module card.

[0025] In the above embodiments, the redundant cascade base may have two controller slots 200 to install two controller cards, and adopt a redundant operation mode of one master and one standby. The master controller in the two controller cards has complete control functions, while the standby controller synchronously executes the same application program and logic operations, and simultaneously monitors the status of the communication bus in real time to ensure seamless switching in case of master controller failure. Furthermore, the redundant cascade base incorporates redundant communication circuits for the two controller cards, coupled with a dual-transmit / receive communication bus 400, enabling each controller card to interact with all input / output module cards to achieve control functions for the industrial system.

[0026] The redundant cascaded base for industrial control systems proposed in this embodiment integrates multiple controller slots and multiple input / output module slots onto the same circuit board. Each controller slot has an independent communication bus that is connected to all input / output module slots, achieving an integrated layout of controller cards and input / output module cards. This reduces the number of independent bases and wiring requirements. Simultaneously, multiple controller cards can communicate with all input / output module cards through their respective buses, forming a controller redundancy backup architecture. In the event of a controller failure, other controllers can seamlessly take over communication, preventing system downtime and significantly improving the operational stability and redundancy fault tolerance of the industrial control system.

[0027] In one embodiment, such as Figure 2 As shown, the plurality of controller slots include a first controller slot 210 and a second controller slot 220; the communication bus corresponding to the first controller slot 210 is a first communication bus 410, and the communication bus corresponding to the second controller slot 220 is a second communication bus 420. The first controller slot 210 is also electrically connected to the second communication bus 420, and the second controller slot 220 is also electrically connected to the first communication bus 410.

[0028] In the embodiments provided in this application, both controller cards are simultaneously connected to the dual-channel communication bus to support parallel processing by the two controllers and ensure stable and reliable redundant communication. Meanwhile, the redundant cascading base of the industrial control system can be equipped with 10 universal input / output module slots to accommodate various I / O modules such as analog input module cards, analog output module cards, digital input module cards, digital output module cards, RTD input module cards, and thermocouple input module cards. This provides redundant communication functionality for the input / output module cards, and the failure of any one communication bus does not affect the normal communication function between the cards.

[0029] In one embodiment, such as Figure 3 As shown, the circuit board 100 of the redundant cascaded base of the industrial control system also has a system power interface 500; wherein, the system power interface 500 is connected to each of the controller slots 200 and each of the input / output module slots 300 through traces on the circuit board 100; here, the system power interface 500 can be connected to the contacts in the controller slots 200 for supplying power to the controller cards, and the contacts in the input / output module slots 300 for supplying power to the input / output module cards.

[0030] Furthermore, the system power interface 500 is used to connect to an external system power supply (not shown in the figure), to receive a system power supply voltage of the first voltage level from the system power supply, and to supply power to the controller card connected to the controller slot 200 and the input / output module card connected to the input / output module slot 300.

[0031] Furthermore, the circuit board 100 of the redundant cascaded base of the industrial control system also has a field power interface 600; wherein, the field power interface 600 is connected to each of the input / output module slots 300 through traces on the circuit board 100; here, the field power interface 600 is used to connect to an external field power supply (not shown in the figure), to receive a field power supply voltage of the second voltage level from the field power supply, and to supply power to the input / output module cards connected to the input / output module slots 300, so as to supply power to the field devices connected to the input / output module cards via the input / output module cards.

[0032] Furthermore, the first voltage level can be 24V, and the second voltage level can be 48V. Simultaneously, the system power interface 500 and the field power interface 600 are equipped with anti-misconnection design. The physical structures of the two interfaces are different, and they can be labeled differently to avoid mixing of field power and system power. The embodiment provided in this application, by separating the system power interface and the field power interface, respectively connecting to 24V system power and 48V field power, distributes power to the controller card and input / output module card, achieving redundant power supply for the system. At the same time, each interface is equipped with anti-misconnection design to avoid the risk of power mixing and improve the power supply reliability of the control system.

[0033] In one embodiment, such as Figure 3 As shown, the circuit board 100 of the redundant cascaded base of the industrial control system also has a Global Positioning System (GPS) interface 700. The GPS interface 700 is used to connect to a GPS receiver module. The GPS receiver module has a built-in antenna or an external antenna interface, which can capture the radio frequency time signal broadcast by GPS satellites. After conditioning and decoding by its internal circuit, it transmits the standardized time signal of IRIG-B code to the GPS interface 700 to provide a high-precision clock reference for the industrial control system and ensure clock synchronization accuracy.

[0034] Specifically, the Global Positioning System (GPS) interface 700 is connected to each of the controller slots 200 via traces on the circuit board 100, so that a controller card can be connected to the controller slot 200. When the GPS interface 700 is connected to the GPS receiver module, the GPS interface 700 can send the GPS signal received from the GPS receiver module to the controller card, providing a precise real-time clock for the controller on the controller card, ensuring that the SOE time accuracy reaches the millisecond level, and enabling the controller's clock accuracy to reach 1ms.

[0035] Furthermore, the circuit board 100 of the redundant cascade base of the industrial control system also has a communication bus cascade expansion interface 800, which is used to connect input / output module expansion devices (not shown in the figure); wherein, the communication bus cascade expansion interface 800 can be a DB25 cascade interface. Here, the input / output module expansion device can be an I / O expansion chassis, which can connect multiple input / output module cards.

[0036] Specifically, the communication bus cascade expansion interface 800 is connected to each controller slot 200 via traces on the circuit board 100. When the controller card is connected to the controller slot 200 and the input / output module expansion device is connected to the communication bus cascade expansion interface 800, the controller card can establish a communication connection with each input / output module card in the input / output module expansion device. This allows for data and clock signal transmission via communication cables, enabling bus communication between the expanded input / output module cards and the controller card. In the embodiments provided in this application, a GPS receiver module is connected via a Global Positioning System (GPS) interface to provide the controller card with a millisecond-level high-precision clock, ensuring SOE synchronization accuracy with the clock. Furthermore, the communication bus cascade expansion interface supports I / O expansion chassis access, enabling flexible expansion of the number of I / O module cards. The expanded modules can establish stable communication connections with the controller, meeting the system's precise time synchronization requirements while improving the base's expandability to adapt to complex industrial scenarios.

[0037] In one embodiment, such as Figure 4 As shown, the circuit board of the redundant cascaded base of the industrial control system also has multiple aviation plug network interfaces 900, which are used to connect to a remote host computer (not shown in the figure).

[0038] Specifically, the controller slot 200 is connected to at least one of the aviation plug network interfaces 900 via traces on the circuit board 100, enabling the controller card connected to the controller slot 200 to establish a communication connection with a remote host computer through the aviation plug network interface 900. Here, each controller slot 200 can be connected to two specific aviation plug network interfaces 900, which correspond to network A and network B respectively. They employ a 4-core differential wiring design, which is fully compatible with the four pairs of signals of the RJ45 interface. Shielded twisted-pair cables can be directly crimped for connection, providing vibration-resistant and anti-detachment structural advantages. This achieves dual-transmit / receive redundancy, ensuring that a failure in the network corresponding to any one aviation plug network interface 900 does not affect the overall communication function of the system.

[0039] Furthermore, the circuit board 100 of the redundant cascade base of the industrial control system also includes multiple hardware address encoders S, the number of which is equal to and corresponds one-to-one with the number of input / output module slots 300.

[0040] Furthermore, the hardware address encoder S is used to set the hardware address of the input / output module card connected to the corresponding input / output module slot 300; wherein, the hardware address encoder S has a 7-bit DIP switch. Specifically, the hardware address encoder S is connected to the controller slot 200 through traces on the circuit board 100, so that when a controller card is connected to the controller slot 200 and an input / output module card is connected to the input / output module slot 300, the controller card can determine the hardware address of the input / output module card through the hardware address set by the hardware address encoder S.

[0041] Here, as Figure 5 As shown, the DIP switches of bits 5 to 7 of the hardware address encoder S are used to set the high three bits of the DIP address of the input / output module card connected to the corresponding input / output module slot 300. When the DIP switch is in the default position, its address is "0"; when the DIP switch is in the reverse position, its address is "1", so that the address conforms to the binary-coded decimal (BCD) code rules.

[0042] Furthermore, the first to fourth DIP switches of the hardware address encoder S are fixed and used to set the lower four bits of the address, so that the lower four bits of the address are preset on the circuit for each input / output module slot 300. Here, the lower four bits of the address are determined by the slot number of the input / output module slot 300. For example, the lower four fixed addresses of the hardware address encoder S corresponding to the input / output module slot 300 with slot number 3 are "0011", and the lower four fixed addresses of the hardware address encoder S corresponding to the input / output module slot 300 with slot number 12 are "1100".

[0043] Specifically, when determining the hardware address of the input / output module card connected to the input / output module slot 300, the controller card can determine the lower four fixed bits of the hardware address encoder S corresponding to the input / output module slot 300, and add it to the higher three DIP switch addresses to generate a unique 7-bit address, so that the controller card can directly determine the hardware address of the input / output module card inserted into the input / output module slot 300.

[0044] As an example, the lower 4 bits of the fixed address of the hardware address encoder S corresponding to the input / output module slot 300 with slot number 4 are "0100" and the upper 3 bits of the hardware address encoder S are "100". Then the hardware address of the input / output module card inserted into the input / output module slot 300 is 4 (0100) + 16 (100) = 20.

[0045] In one embodiment, such as Figure 6As shown, the circuit board 100 of the redundant cascade base of the industrial control system also has multiple input / output data interfaces 310, which are used to connect to external field devices (not shown in the figure).

[0046] Specifically, each input / output module slot 300 is connected to at least one input / output data interface 310 via traces on the circuit board 100, so that when the input / output module card is inserted into the input / output module slot 300 and the field device is connected to the input / output data interface 310, the input / output module card can establish a communication connection with the field device. Here, if the number of input / output module slots 300 is 10, the number of input / output data interfaces 310 can be 20, and every two input / output data interfaces 310 can correspond to a specific input / output module slot 300 and establish a communication connection. Here, the two input / output data interfaces 310 corresponding to one input / output module slot 300 can be DB44-A interface and DB44-B interface, respectively, to realize signal interaction with the field device.

[0047] Furthermore, such as Figure 7 As shown, the two controller slots 200 form redundant communication. The controller slot 200 can communicate with the host computer via the aviation plug network interface 900 and perform GPS communication based on the Global Positioning System interface 700. Simultaneously, it can also communicate with the expanded input / output module cards in the expansion chassis via the communication bus cascade expansion interface 800. Furthermore, the input / output module slot 300 can communicate with external field devices via the input / output data interface 310 and can be connected to a redundant 48V field power supply via the field power interface 600. Furthermore, a redundant 24V system power supply can be connected via the system power interface 500 to power the controller cards and input / output module cards; simultaneously, the hardware address encoder S can set the corresponding hardware address for the input / output module slot 300, directly assigning a hardware address to the input / output module card when it is inserted into the input / output module slot 300.

[0048] Furthermore, such as Figure 8 As shown, there are two controller slots 200 and ten input / output module slots 300. Both can be located on the first side of the circuit board 100, which can be the front side of the circuit board 100.

[0049] Furthermore, such as Figure 9As shown, the system power interface 500, field power interface 600, global positioning system interface 700, communication bus cascade expansion interface 800, aviation plug network interface 900, input / output data interface 310, and hardware address encoder S can be located on the second side of the circuit board 100, which can be the back of the circuit board 100. Here, Figure 8 and Figure 9 The locations of the controller slot 200, input / output module slot 300, system power interface 500, field power interface 600, global positioning system interface 700, communication bus cascade expansion interface 800, aviation plug network interface 900, and hardware address encoder S are only examples. Their quantity and arrangement can be determined according to the actual situation and are equally applicable to this embodiment.

[0050] Furthermore, in actual use, the two controller cards can be installed into the controller slot 200 of the base, and the base provides a stable power supply to the controller cards. At the same time, it completes the reliable connection of redundant communication bus signals and redundant control signals, and enables network communication between the host computer and the controller cards through the aviation plug network interface 900.

[0051] Furthermore, input / output module cards can be installed into the corresponding input / output module slots 300 in the base. The base provides system power and field power to the input / output module cards, simultaneously enabling the connection of redundant communication bus signals and input / output data signals. Furthermore, each input / output module card can be configured with two input / output data interfaces 310, enabling bidirectional interaction between field signals and the input / output module cards. Simultaneously, dual-redundant 24V system power and dual-redundant 48V field power are connected to their respective power interfaces, and the base distributes power through its internal circuitry, providing stable power to each controller card and input / output module card.

[0052] Furthermore, after the GPS receiver module is connected to the Global Positioning System Interface 700, the IRIG-B code it receives and decodes is transmitted to the controller card via the base, providing the controller with a precise real-time clock, ensuring that the SOE time accuracy reaches the millisecond level, and stabilizing the controller clock accuracy at 1ms.

[0053] Furthermore, a multi-chassis cascading mode can be achieved through the communication bus cascading expansion interface 800. By connecting the DB25 prefabricated cable from the IO expansion chassis to the communication bus cascading expansion interface 800 on the base, the input / output module cards can be expanded. The address differentiation settings of each input / output module card can be completed by adjusting the DIP switches.

[0054] The redundant cascading base for industrial control systems provided in this application achieves the core functions of "high integration, zero configuration, cascading capability, redundant synchronization, and GPS hard time synchronization," forming a dedicated base adapted to DCS distributed control systems. It can be widely used in industrial applications such as power and chemical industries where system reliability requirements are stringent. It effectively saves equipment deployment costs and cabinet installation space, significantly improves the integration and ease of maintenance of DCS systems, and better meets the high-efficiency deployment needs in industrial automation scenarios.

[0055] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A redundant cascade base for an industrial control system, characterized in that, The redundant cascade base of the industrial control system includes multiple controller slots and multiple input / output module slots mounted on the same circuit board. The controller slot is used to connect a controller card, and the input / output module slot is used to connect an input / output module card. Each controller slot corresponds to a communication bus, and the controller slot is connected to all the input / output module slots through the corresponding communication bus; When the controller card is connected to the controller slot and the input / output module card is connected to the input / output module slot, each controller card can establish a communication connection with all the input / output module cards through the corresponding communication bus.

2. The redundant cascade base for the industrial control system according to claim 1, characterized in that, The plurality of controller slots includes a first controller slot and a second controller slot; the communication bus corresponding to the first controller slot is a first communication bus, and the communication bus corresponding to the second controller slot is a second communication bus; The first controller slot is also communicatively connected to the second communication bus, and the second controller slot is also communicatively connected to the first communication bus.

3. The redundant cascade base for the industrial control system according to claim 1, characterized in that, Each of the input / output module slots is a universal slot, which is adapted to analog input module cards, analog output module cards, digital input module cards, digital output module cards, RTD input module cards, and thermocouple input module cards.

4. The redundant cascade base for an industrial control system according to claim 1, characterized in that, The redundant cascade base of the industrial control system also has a system power interface on its circuit board. The system power interface is connected to each controller slot and each input / output module slot via traces on the circuit board. The system power interface is used to connect to an external system power supply, to receive a system power supply voltage of the first voltage level from the system power supply, and to supply power to the controller card connected to the controller slot and the input / output module card connected to the input / output module slot.

5. The redundant cascade base for an industrial control system according to claim 1, characterized in that, The redundant cascade base of the industrial control system also has a field power interface on its circuit board. The field power interface is connected to each of the input / output module slots via traces on the circuit board; The field power interface is used to connect to an external field power source, to receive a second voltage level field power supply voltage from the field power source, and to supply power to the input / output module card connected to the input / output module slot, so as to supply power to the field devices connected to the input / output module card via the input / output module card.

6. The redundant cascade base for an industrial control system according to claim 1, characterized in that, The redundant cascade base of the industrial control system also has a communication bus cascade expansion interface on its circuit board, which is used to connect input / output module expansion devices. The communication bus cascade expansion interface is connected to the controller slot via traces on the circuit board, so that when the controller card is connected to the controller slot and the input / output module expansion device is connected to the communication bus cascade expansion interface, the controller card can establish a communication connection with the input / output module card in the input / output module expansion device.

7. The redundant cascade base for an industrial control system according to claim 1, characterized in that, The circuit board of the redundant cascade base of the industrial control system also has a global positioning system interface, which is used to connect to the global positioning system receiving module. The GPS interface is connected to the controller slot via traces on the circuit board, so that when the controller card is inserted into the controller slot and the GPS receiver module is connected to the GPS interface, the GPS receiver module can send GPS signals to the controller card.

8. The redundant cascade base for an industrial control system according to claim 1, characterized in that, The circuit board of the redundant cascade base of the industrial control system also includes multiple hardware address encoders, each of which corresponds to one of the input / output module slots. The hardware address encoder is used to set the hardware address of the input / output module card connected to the corresponding input / output module slot; The hardware address encoder is connected to the controller slot via traces on the circuit board, so that when the controller card is connected to the controller slot and the input / output module card is connected to the input / output module slot, the controller card can determine the hardware address of the input / output module card through the hardware address set by the hardware address encoder.

9. The redundant cascade base for an industrial control system according to claim 1, characterized in that, The circuit board of the redundant cascaded base of the industrial control system also has multiple aviation plug network interfaces, which are used to connect to a remote host computer. The controller slot is connected to at least one of the aviation plug network interfaces via traces on the circuit board, so that the controller card connected to the controller slot can establish a communication connection with a remote host computer through the aviation plug network interface.

10. The redundant cascade base for an industrial control system according to claim 1, characterized in that, The circuit board of the redundant cascade base of the industrial control system also has multiple input / output data interfaces, which are used to connect to external field devices. Each input / output module slot is connected to at least one input / output data interface via traces on the circuit board, so that when the input / output module card is inserted into the input / output module slot and the field device is connected to the input / output data interface, the input / output module card can establish a communication connection with the field device.

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