All-electronic interlocking universal input and output device

Abstract

The application discloses a full electronic interlocking general input and output device, which comprises a CPU circuit of 2-to-2, a safety output circuit, a safety input acquisition circuit, a communication circuit, a state indication circuit and a device address reading circuit. The device realizes communication function with an interlocking machine, safety output function, safety input acquisition function, device address reading function, output and input state indication function and the like by adopting a fault-safety principle. The device adopts modular design and has high integration degree. The CPU circuit adopts a 2-to-2 control mode, thereby ensuring the safety of the system. The full electronic interlocking general input and output device is used to replace existing relay connection, thereby reducing construction wiring and construction and maintenance costs and greatly reducing the occupied space of the device.

Description

Technical Field

[0001] This utility model relates to the field of general input / output in railway signal interlocking systems, and particularly to a general input / output device for fully electronic interlocking. Background Technology

[0002] To enable signal exchange between the computer interlocking system and other interlocking systems, level crossing control systems, etc., as well as the acquisition of general input signals and equipment control, traditional computer interlocking systems use a large number of 6502 relay assemblies. The relay assemblies are connected to the IO module of the interlocking system through cables. There are many connecting cables between cabinets, which pose safety hazards such as cross-wiring and mixed power. The system occupies a large space, has high equipment cost, many types of equipment, and is complex to operate and maintain.

[0003] When upgrading existing lines, using relay interlocking for communication results in complex engineering design, difficult construction, and long cycle. While replacing relay interlocking with a fully electronic interlocking system is simple to install and has a short construction cycle, it is more expensive.

[0004] Therefore, how to reduce the construction and maintenance costs of computer interlocking systems while meeting the demand for low costs is an urgent problem to be solved. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a universal input / output device for fully electronic interlocking, capable of signal exchange between a computer interlocking system and other interlocking systems, or a level crossing control system, as well as universal input signal acquisition and equipment control. The specific solution is as follows:

[0006] This application provides a universal input / output device for fully electronic interlocking. The universal input / output device for fully electronic interlocking is connected to a computer interlocking system through a communication module and a communication network. The universal input / output device for fully electronic interlocking includes: a CPU circuit, a safety output circuit, a safety input acquisition circuit, a communication circuit, a status indication circuit, and a device address reading circuit.

[0007] The CPU circuit adopts a 2-out-of-2 control mode, including CPUA and CPUB. CPUA and CPUB are connected in communication. CPUA and CPUB are respectively connected in communication with the safety output circuit, the safety input acquisition circuit, the communication circuit, the status indication circuit and the device address reading circuit, and are used to receive and execute output commands issued by the computer interlocking system and respond to the input channel acquisition status.

[0008] The safety output circuit includes a dynamic safety power supply circuit and a safety relay circuit, which are used to receive control signals from the CPU circuit and realize the on / off switching of external controlled signals according to the control signals.

[0009] The safe input acquisition circuit includes a self-test circuit and an isolation conversion circuit, used to acquire external digital voltage signals, convert the voltage signals, and output them to the CPU circuit;

[0010] The communication circuit is used to connect the all-electronic interlock universal input / output device to the communication network;

[0011] The status indication circuit is a circuit in which each CPU displays the working status of the module through LED indicator lights;

[0012] The device address reading circuit is an independent address acquisition circuit for each CPU of this device, used to acquire the unique working ID of this device in the system.

[0013] Optionally, the all-electronic interlock universal input / output device includes two independent dynamic safety power supplies. Each dynamic safety power supply circuit is controlled by CPUA and CPUB. Each time an action output command is executed, the two dynamic safety power supply circuits work simultaneously.

[0014] Optionally, CPUA and CPUB output square wave signals with the same frequency but opposite phase to the dynamic safety power supply circuit to control the dynamic safety power supply circuit to convert DC24V power supply to safe 24V power supply.

[0015] Optionally, the 24V safety power generated by the dynamic safety power supply circuit supplies power to the corresponding safety relay circuits.

[0016] Optionally, the safety relay circuit consists of safety relay K1 and safety relay K2. Safety relay K1 and safety relay K2 need to operate together for the external controlled signal to be connected.

[0017] Optionally, when the CPU circuit detects that the safety relay has been activated, the CPU circuit will illuminate the corresponding LED indicator in the status indication circuit.

[0018] Optionally, the all-electronic interlock universal input / output device includes two independent safety input acquisition circuits. CPUA and CPUB each correspond to an independent set of safety input acquisition circuits, and the input signals acquired by the external interface will simultaneously enter the input channels corresponding to CPUA and CPUB.

[0019] Optionally, the CPU circuit acquires the converted voltage signal through the isolation conversion circuit. When the CPU circuit acquires the voltage signal, it will illuminate the corresponding LED indicator in the status indication circuit.

[0020] Optionally, the CPU circuit outputs a detection signal to test the isolation conversion circuit via the self-test circuit.

[0021] Optionally, CPUA and CPUB are connected to the communication network through communication circuit 1 and communication circuit 2, respectively. The two communication ports of CPUA or CPUB, serial port 1 and serial port 2, are connected to RS485 bus chip through communication isolation chip. RS485 bus chip is finally connected to the communication network.

[0022] This application's all-electronic interlocking universal input / output device includes a CPU circuit, a safety output circuit, a safety input acquisition circuit, a communication circuit, a status indication circuit, and a device address reading circuit. It adopts a modular design and has a high degree of integration. The CPU circuit adopts a 2-out-of-2 control mode to ensure system safety. Using this application's all-electronic interlocking universal input / output device to replace the existing relay connection reduces construction wiring, lowers construction and maintenance costs, and significantly reduces the space occupied by the equipment. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram showing the connection between the computer interlocking system and the universal input / output device for fully electronic interlocking disclosed in this application;

[0025] Figure 2 This is a schematic diagram of the frame of the universal input / output device for fully electronic interlocking disclosed in this application;

[0026] Figure 3 This is a block diagram of a single dynamic safety power supply circuit disclosed in this application;

[0027] Figure 4 This is a block diagram of the safety relay circuit disclosed in this application;

[0028] Figure 5 This is a block diagram of the single secure input acquisition circuit disclosed in this application;

[0029] Figure 6 This is a block diagram of the communication circuit corresponding to a single CPU disclosed in this application. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figure 1 As shown, the computer interlocking system (the two-by-two interlocking machine in the figure, hereinafter referred to as the interlocking machine) is connected to the all-electronic interlocking universal input / output device through communication network 1, communication module and communication network 2. The interlocking machine communicates with the redundant communication module A1 / B1 through the redundant communication network 1 - CAN bus. The communication module A1 / B1 then communicates with this device through the redundant communication network 2 - RS485 bus. This ensures the communication function between the universal input / output device and the interlocking machine, the safety output function, the safety input acquisition function, the device address reading function, the output and input status indication function, etc.

[0032] Figure 2 This is a schematic diagram of the framework of a universal input / output device for all-electronic interlocking systems, as shown below. Figure 2 As shown, the all-electronic interlocking universal input / output device consists of a 2-to-2 CPU circuit, a safety output circuit, a safety input acquisition circuit, a communication circuit, a status indication circuit, and a device address reading circuit. The safety output circuit comprises a dynamic safety power supply circuit and a safety relay circuit. The safety input acquisition circuit consists of a self-test circuit and an isolation conversion circuit. The status indication circuit displays the module's operating status (communication status, fault status, output status, and input acquisition status) via LED indicators for each CPU. The device address reading circuit is an independent address acquisition circuit for each CPU, used to acquire the device's unique working ID within the system.

[0033] Furthermore, the CPU circuit includes CPUA and CPUB, which are interconnected. CPUA and CPUB are also interconnected with the safety output circuit, safety input acquisition circuit, communication circuit, status indication circuit, and device address reading circuit, respectively. CPUA and CPUB use a 2-out-of-2 control mode to receive and execute output commands issued by the interlocking machine and respond to the input channel acquisition status. Specifically, after receiving the output command from the interlocking machine, the all-electronic interlocking universal input / output device compares the consistency of the control commands. When the control commands match, it drives the corresponding safety output channel, thereby controlling the on / off state of the external controlled signals and acquiring the digital voltage status of the input channels in real time. The acquired information is then sent to the interlocking machine to realize the safety output function and the safety input acquisition function.

[0034] like Figure 2 As shown, the safety output circuit consists of two parts: a dynamic safety power supply circuit and a safety relay circuit. Furthermore, the fully electronic interlocking universal input / output device includes two independent dynamic safety power supplies. Each dynamic safety power supply circuit is controlled by CPUA and CPUB. Each time an action output command is executed, the two dynamic safety power supply circuits work simultaneously. Each dynamic safety power supply circuit provides working power to the corresponding safety output relay to ensure that the system does not output incorrectly, thereby improving the safety of output control.

[0035] Figure 3 It is a block diagram of a single dynamic safety power supply circuit, such as Figure 3 As shown, the dynamic safety power supply circuit communicates with CPUA and CPUB respectively. CPUA and CPUB output square wave signals with the same frequency but opposite phase to the dynamic safety power supply circuit, controlling the dynamic safety power supply circuit to convert DC24V power to safe 24V power. When the square wave signals output by CPUA and CPUB are abnormal, such as when either CPUA or CPUB does not output a square wave signal, or when the output remains at a high or low level, or when the phase of the output square wave signal is abnormal, the dynamic safety power supply circuit will not generate safe 24V power. When any component in the dynamic safety power supply circuit fails, such as a short / open circuit of a resistor, a short / open circuit of a diode, or a short / open circuit of a capacitor, the dynamic safety power supply circuit will also not generate safe 24V power. The dynamic safety power supply circuit adopts a "fail-safe" design concept to ensure that the circuit will not generate safe 24V power under any fault conditions.

[0036] like Figure 2 , Figure 3 As shown, the 24V safety power generated by each dynamic safety power supply circuit powers the corresponding safety relay circuit.

[0037] Figure 4 This is a block diagram of a safety relay circuit, such as... Figure 4 As shown, the safety relay circuit consists of safety relays K1 and K2. The two sets of normally open contacts of safety relays K1 and K2 are connected in series. Safety relays K1 and K2 need to operate together. Only when the two sets of normally open contacts of safety relays K1 and K2 are closed at the same time can the external controlled signal be connected from the IN terminal to the OUT terminal. At the same time, the CPU circuit will also monitor the operating status of the safety relays through the normally closed contact 56 of the safety relays to determine whether the safety relays have performed the correct operation according to the control command. When the safety relay is detected to be operating, the CPU circuit will light up the corresponding LED indicator in the status indicator circuit.

[0038] The safety relay in this application is a small safety relay that conforms to European standards. This relay has a forced guiding device to ensure that the normally open / normally closed contacts do not stick together at the same time.

[0039] like Figure 2 As shown, the safety input acquisition circuit consists of two parts: a self-test circuit and an isolation conversion circuit. Furthermore, the all-electronic interlock universal input / output device includes two independent safety input acquisition circuits, with CPUA and CPUB each corresponding to an independent set of safety input acquisition circuits. The input signals acquired by the external interface will simultaneously enter the corresponding input channels of CPUA and CPUB.

[0040] Figure 4 This is a block diagram of a single safe input acquisition circuit, such as... Figure 4 As shown, the safety input acquisition circuit is used to acquire external digital voltage signals. The CPU circuit acquires the converted voltage signal through an isolation conversion circuit. Further, the input voltage signal DC24V is first divided by resistors R1 and R2. The divided signal enters the isolation conversion circuit U3. The CPU circuit acquires this voltage signal at the output side of the isolation conversion circuit U3, indicating an external input signal. At this time, the CPU circuit will illuminate the corresponding LED indicator in the status indicator circuit to indicate the presence of an external input signal. The CPU circuit outputs a detection signal to test the isolation conversion circuit U3 through a self-test circuit to detect whether there is a fault in the isolation conversion circuit U3, causing its output to remain in a conducting state to prevent the CPU circuit from generating erroneous input acquisition. The working principle of the detection of the isolation conversion circuit U3 is that the CPU circuit must not output a detection signal to properly acquire the input signal of the isolation conversion circuit U3; when the CPU circuit outputs a detection signal, if a signal is acquired, it indicates that the isolation conversion circuit U3 is faulty, and its acquired signal will be considered an erroneous acquisition and will not be used. The CPU circuit periodically changes the detection signal to achieve the detection of the isolation conversion circuit U3.

[0041] like Figure 2 As shown, the CPUA and CPUB of the all-electronic interlocking universal input / output device are connected to the communication network 2 through communication circuit 1 and communication circuit 2, respectively. Figure 4 A block diagram of the communication circuit for a single CPU, such as Figure 4 As shown, the two communication ports of CPUA or CPUB, serial port 1 and serial port 2, are connected to an RS485 bus chip via a communication isolation chip. The RS485 bus chip is ultimately connected to communication network 2. The isolation power supply converts the operating power to the power required for the isolation chip and RS485 bus chip connected to communication network 2. This isolates the CPU's operating circuitry from communication network 2, ensuring that interference signals or surges on communication network 2 will not affect the CPU's operation.

[0042] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A universal input / output device for fully electronic interlocking, characterized in that, The fully electronic interlocking universal input / output device is connected to the computer interlocking system through a communication module and a communication network. The fully electronic interlocking universal input / output device includes: a CPU circuit, a safety output circuit, a safety input acquisition circuit, a communication circuit, a status indication circuit, and a device address reading circuit. The CPU circuit adopts a 2-out-of-2 control mode, including CPUA and CPUB. CPUA and CPUB are connected in communication. CPUA and CPUB are respectively connected in communication with the safety output circuit, the safety input acquisition circuit, the communication circuit, the status indication circuit and the device address reading circuit, and are used to receive and execute output commands issued by the computer interlocking system and respond to the input channel acquisition status. The safety output circuit includes a dynamic safety power supply circuit and a safety relay circuit, which are used to receive control signals from the CPU circuit and realize the on / off switching of external controlled signals according to the control signals. The safe input acquisition circuit includes a self-test circuit and an isolation conversion circuit, used to acquire external digital voltage signals, convert the voltage signals, and output them to the CPU circuit; The communication circuit is used to connect the all-electronic interlock universal input / output device to the communication network; The status indication circuit is a circuit in which each CPU displays the working status of the module through LED indicator lights; The device address reading circuit is an independent address acquisition circuit for each CPU of this device, used to acquire the unique working ID of this device in the system.

2. The all-electronic interlocking universal input / output device according to claim 1, characterized in that, The all-electronic interlocking universal input / output device includes two independent dynamic safety power supplies. Each dynamic safety power supply circuit is controlled by CPUA and CPUB. Each time an action output command is executed, both dynamic safety power supply circuits work simultaneously.

3. The all-electronic interlocking universal input / output device according to claim 2, characterized in that, CPUA and CPUB output square wave signals with the same frequency but opposite phase to the dynamic safety power supply circuit, controlling the dynamic safety power supply circuit to convert DC24V power to safe 24V power.

4. The all-electronic interlocking universal input / output device according to claim 3, characterized in that, The 24V safety power generated by the dynamic safety power supply circuit supplies power to the corresponding safety relay circuits.

5. The all-electronic interlocking universal input / output device according to claim 1, characterized in that, The safety relay circuit consists of safety relay K1 and safety relay K2. Safety relay K1 and safety relay K2 need to operate together for the external controlled signal to be connected.

6. The all-electronic interlocking universal input / output device according to claim 5, characterized in that, When the CPU circuit detects that the safety relay has been activated, the CPU circuit will illuminate the corresponding LED indicator in the status indicator circuit.

7. The all-electronic interlocking universal input / output device according to claim 1, characterized in that, The all-electronic interlocking universal input / output device includes two independent safety input acquisition circuits. CPUA and CPUB each correspond to an independent set of safety input acquisition circuits. Input signals acquired by the external interface will simultaneously enter the input channels corresponding to CPUA and CPUB.

8. The all-electronic interlocking universal input / output device according to claim 1, characterized in that, The CPU circuit acquires the converted voltage signal through the isolation conversion circuit. When the CPU circuit acquires the voltage signal, it will light up the corresponding LED indicator in the status indicator circuit.

9. The all-electronic interlocking universal input / output device according to claim 1, characterized in that, The CPU circuit outputs a detection signal to test the isolation conversion circuit through the self-test circuit.

10. The all-electronic interlocking universal input / output device according to claim 1, characterized in that, CPUA and CPUB are connected to the communication network through communication circuit 1 and communication circuit 2, respectively. The two communication ports of CPUA or CPUB, serial port 1 and serial port 2, are connected to RS485 bus chip through communication isolation chip. RS485 bus chip is finally connected to the communication network.

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