Daisy chain topological structure capable of automatically filtering error nodes

Abstract

The utility model discloses a daisy chain topological structure capable of automatically filtering error nodes, which comprises a plurality of switch nodes, each switch node comprises a main control chip, a switch chip and a switch chip power supply, the switch chip is connected with a first network port and a second network port, the first network port is connected with a previous node of a daisy chain, and the second network port is connected with a next node of the daisy chain. Linking a next node of the daisy chain through a second network port so as to access the daisy chain; and a first electric control switch is connected between the first network port and the second network port and is used for short-circuiting the first network port and the second network port through the first electric control switch when the switch node is abnormal. The electric control switch capable of enabling the two network ports to be short-circuited is designed between the first network port and the second network port, the fault tolerance of the system can be improved, and even if a certain node goes wrong, the performance of the whole system cannot be seriously influenced.

Description

Technical Field

[0001] The utility model belongs to a network equipment connection technology and relates to a daisy chain topology structure capable of automatically filtering error nodes. Background Art

[0002] In the field of industrial control, "daisy chain" is a specific network topology, also known as "daisy-type topology" or "daisy-style topology". The daisy chain topology usually consists of a central node (core switch or controller) connected to multiple peripheral nodes (terminal devices or slave nodes), forming a structure similar to daisy petals.

[0003] In the daisy chain topology, multiple control loops are connected together in a specific order to form a loop structure. The output of each control loop is used as the input of the next control loop, thus achieving cascade control.

[0004] Daisy chain topology has some advantages in industrial control such as flexibility, simplicity, low latency, synergy, multi-level control, cost-effectiveness, etc.

[0005] Although the daisy chain can better handle the inter-correlation and time lag in the topology circuit, the overall control performance of the topology is also affected by all links. When one or more loops in the daisy chain are disturbed or fail, the stability of the entire system may be affected. In particular, when there is strong coupling or time lag between control loops, oscillation or unstable behavior may occur. Once a node (link) fails, all nodes after this node will have errors, and stability is often an issue that cannot be ignored in the field of industrial control. Utility Model Content

[0006] In order to solve the above-mentioned problems, in order to prevent a loop in the daisy chain from being disturbed or failing, that is, to prevent the stability of the entire topology from being affected when a single point failure occurs, and to address the problem that a single node in actual applications is prone to node failure due to short circuit, open circuit, damage to the switch chip due to excessive load, etc., a daisy chain topology structure that can automatically filter out erroneous nodes is designed, so that the daisy chain can automatically remove erroneous nodes in the event of a single point error without affecting the use of the entire topology structure.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A daisy chain topology structure capable of automatically filtering error nodes includes a plurality of switch nodes, each of which includes a main control chip, a switch chip and a switch chip power supply, the switch chip is connected to a first network port and a second network port, the first network port is used to connect to the previous node of the daisy chain, and the second network port is used to connect to the next node of the daisy chain to access the daisy chain;

[0009] A first electronically controlled switch is connected between the first network port and the second network port, and is used to short-circuit the first network port and the second network port through the first electronically controlled switch when the switch node is abnormal.

[0010] In the above-mentioned daisy chain topology structure capable of automatically filtering error nodes, the first electrically controlled switch is a normally closed relay, and the control end of the normally closed relay is connected to the switch chip.

[0011] The normally closed relay is controlled by the switch chip. When the switch chip is powered on, the control end of the normally closed relay will receive an electrical signal and is therefore in a disconnected state, and the switch node is connected to a daisy chain. When the switch chip is powered off, the normally closed relay will not receive an electrical signal and is therefore in a connected state. The first network port and the second network port of the switch node are short-circuited, and the previous node is directly linked to the next node, thereby achieving the purpose of filtering the current node.

[0012] In the above-mentioned daisy chain topology structure capable of automatically filtering error nodes, the control end of the first electronically controlled switch is connected to the main control chip.

[0013] The first electric control switch is controlled by the main control chip. When the switch works normally, the second relay is in a disconnected state, and in an abnormal state, the second relay is in a connected state.

[0014] In the above-mentioned daisy chain topology structure capable of automatically filtering error nodes, the main control chip is connected to the switch chip via the third network port of the switch chip, and is used to detect the network connection signal of the switch node.

[0015] In the above-mentioned daisy chain topology structure capable of automatically filtering error nodes, the first electric control switch is a four-way relay, and the first network port and the second network port respectively have four signal lines;

[0016] The four input ends of the four-way relay are connected to the four signal lines of the first network port, and the four output ends are connected to the four signal lines of the second network port. There are controlled switches between the four input ends and the four output ends, which are used to connect the first network port and the second network port when the switch node is abnormal.

[0017] Each relay is designed inside the switch node. For the switch, there are still a first network port and a second network port available for plugging in, that is, the first network port and the second network port are still used to connect the previous node and the next node of the daisy chain respectively.

[0018] In the above-mentioned daisy chain topology structure capable of automatically filtering error nodes, a second electric control switch is connected between the switch chip power supply and the switch chip, and the second electric control switch is connected to the main control chip so that the main control chip controls to disconnect or connect the power supply of the switch chip. By adding the second electric control switch controlled by the main control chip, the current node can be isolated when a problem occurs in the switch chip, thereby achieving the purpose of filtering error nodes.

[0019] In the above-mentioned daisy chain topology structure that can automatically filter out erroneous nodes, the second electrically controlled switch is a five-way relay, wherein the first to fourth ways are respectively connected to the main control chip through the third network port via four signal lines, for the main control chip to detect the network connection signal of the switch node; the fifth way is connected to the switch chip power supply, for the main control chip to control the disconnection or connection of the switch chip power supply.

[0020] In the above-mentioned daisy chain topology structure capable of automatically filtering error nodes, two ends of the fifth of the five-way relay are respectively connected to the switch chip power supply and the switch chip;

[0021] And a controlled switch controlled by the main control chip is provided between the two ends of the fifth path.

[0022] In the above-mentioned daisy chain topology structure that can automatically filter error nodes, the two ends of the first to fourth relays of the five-way relay are respectively connected to the four signal lines of the switch chip and the four signal lines of the third network port to detect the network connection signal of the switch node.

[0023] In the above-mentioned daisy chain topology structure capable of automatically filtering error nodes, among the five relays, the ends of the first to fourth relays are respectively controlled switches controlled by the main control chip.

[0024] In the five-way relay, taking the controlled switch as a normally closed switch as an example, when the circuit is normal, the main control chip does not operate the controlled switch, the normally closed switch is not activated, and is in a closed state. When the circuit is abnormal, such as the main control chip cannot detect the network connection signal, the normally closed switch will be activated by the main control chip and be in an open state to isolate the erroneous node with problems and prevent the switch chip from continuing to supply power and interfering with the network signal.

[0025] Compared with the existing technology, the advantages of the utility model are:

[0026] 1. By automatically filtering out error nodes, the topology can be restored to normal working state faster, reducing the oscillation and instability of the topology, helping to maintain the stability of the topology and improving the reliability and availability of the topology;

[0027] 2. The daisy chain topology that automatically filters error nodes can automatically isolate error nodes, thereby preventing faults from propagating throughout the entire control topology. This can improve the fault tolerance of the topology. Even if a node has a problem, it will not have a serious impact on the performance of the entire topology.

[0028] 3. The daisy chain topology that automatically filters error nodes facilitates automatic fault diagnosis and processing when a fault occurs, which can help reduce the need for manual intervention, provide a hardware foundation for reducing the maintenance cost of the topology, and reduce the downtime of the topology caused by human errors.

[0029] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is the overall architecture diagram of the daisy chain topology structure of the utility model which can automatically filter out the error nodes;

[0031] Figure 2 It is an overall structure diagram of another embodiment of the utility model;

[0032] Figure 3 yes Figure 2 The embodiment corresponds to the architecture diagram to implement a circuit schematic diagram for automatically filtering error nodes. DETAILED DESCRIPTION

[0033] The utility model is further described below in conjunction with the accompanying drawings.

[0034] like Figure 1 As shown, nodes 1 to n are all in a daisy chain, carrying the data transmission, reception and control of subsequent nodes. In a general daisy chain, for example, when an error occurs in node 3, it will immediately affect the data transmission of nodes 4-node n, and the entire daisy chain is almost paralyzed, with only nodes 1 and 2 being able to work normally. To this end, this scheme proposes a daisy chain topology structure that can automatically filter error nodes. When faced with the above situation, this structure can filter node 3 so that data can bypass node 3 and thus not affect the data transmission, reception and control of nodes 4-node n.

[0035] Embodiment 1

[0036] On the basis of the original daisy chain, a five-way relay and a four-way relay are added to the switch chip, specifically:

[0037] like Figure 1 As shown, the daisy chain topology structure that can automatically filter error nodes provided by the present solution includes multiple switch nodes, each of which includes a main control chip, a switch chip, and a switch chip power supply. The switch chip is connected to a first network port and a second network port, and the previous node of the daisy chain is connected through the first network port, and the next node of the daisy chain is connected through the second network port to access the daisy chain. Taking node 3 as an example, that is, the first network port is used to connect node 2, and the second network port is used to connect node 4. The four-way relay is used to control the signal between the two network ports to pass through the switch chip.

[0038] When the four-way relay is disconnected, the signal transmission between the first network port and the second network port needs to pass through node 3, that is, node 3 is connected to the daisy chain. When the four-way relay is connected, the first network port is connected to the second network port, and node 2 and node 4 communicate directly without node 3, thereby bypassing node 3.

[0039] In this embodiment, the four-way relay is a normally closed relay, and the control end of the normally closed relay is connected to the switch chip. The four input ends of the four-way relay are connected to the four signal lines of the first network port, and the four output ends are connected to the four signal lines of the second network port. This is a normally closed relay, which means that there is a normally closed switch between the four input ends and the four output ends.

[0040] The normally closed relay is controlled by the switch chip. When the switch chip is powered on, the control end of the normally closed relay will receive an electrical signal, so it is in a disconnected state, and the switch node is connected to the daisy chain. When the switch chip is powered off, the normally closed relay will not receive an electrical signal, so it is in an on state, the first network port and the second network port of the switch node are short-circuited, and the previous node is directly connected to the next node, thereby achieving the purpose of filtering the current node. That is, when the switch is not powered on for some reason, this structure can automatically disconnect the switch to maintain the normal operation of the daisy chain structure as a whole.

[0041] Furthermore, the main control chip is also connected to the switch chip for detecting the network connection signal of the switch node, and the switch chip is connected to a single-way relay, the control end of the single-way relay is connected to the main control chip, and the two ends of the single-way relay are respectively connected to the switch chip power supply and the switch chip. The single-way relay can be a normally closed relay, that is, a normally closed switch with two ends connected to the switch chip power supply and the switch chip respectively. When the circuit is normal, the main control chip does not act on the normally closed relay, and the normally closed relay is not activated and is in a closed state. When the circuit is abnormal, such as the main control chip cannot detect the network connection signal, the normally closed relay will be activated by the main control chip and be in an open state to actively power off the erroneous node with problems.

[0042] In the above embodiment, when a node is not powered on for some reason, the four-way relay will be turned on, so that the first network port and the second network port are short-circuited, and the node is not connected to the daisy chain, thereby achieving the purpose of filtering the node. At the same time, when the switch chip is abnormal, the main control chip will not detect the network signal, so the single-way relay will be disconnected, the switch chip will be disconnected from the power supply, and then the four-way relay will be turned on, and the first network port and the second network port will be short-circuited.

[0043] Embodiment 2

[0044] like Figure 2 and Figure 3 As shown, this embodiment is similar to the first embodiment, except that, in this embodiment, the single-way relay is replaced by a five-way relay, and the two ends of four of the five-way relays are connected to the switch chip and the main control chip respectively. The two ends of the fifth of the five-way relays are connected to the switch chip power supply and the power supply end of the switch chip respectively, and the control end of the five-way relay is connected to the main control chip. The main control chip detects the network connection signal of the switch node through the four-way connected to the switch chip, and disconnects the five-way relay when the network connection signal is not detected.

[0045] Specifically, there is a controlled switch controlled by the main control chip between the two ends of the fifth path, such as a normally closed switch. At the same time, in the five-way relay, there is a controlled switch controlled by the main control chip between the two ends of the first to fourth paths, which can still be a normally closed switch. When the circuit is normal, the main control chip does not act on the aforementioned normally closed switch, the normally closed switch is not activated, and is in a closed state. The main control chip can detect the network connection signal, and when the circuit is abnormal, the normally closed switch will be activated by the main control chip and be in an open state to power off the problematic switch chip and isolate it from the main control chip. At this time, the main control chip will no longer detect the network signal, and the recovery of the faulty node and its network signal detection needs to be achieved through other mechanisms, such as through a monitoring system or manual maintenance.

[0046] Here, by adding five relays controlled by the main control chip, the current node can be isolated when a problem occurs in the switch chip, thereby achieving the purpose of filtering and isolating the error node.

[0047] Embodiment 3

[0048] This embodiment is similar to the first embodiment, except that, in this embodiment, the control ends of the four-way relays are connected to the main control chip, and the four-way relays are controlled by the main control chip instead of the switch chip.

[0049] If the four-way relay is a normally closed relay, when the switch is working normally, the main control chip will send an electrical signal to the normally closed relay to put it in the disconnected state. When the network connection signal cannot be detected due to reasons such as the switch chip being powered off, the normally closed relay will not receive the electrical signal and will therefore be in the connected state.

[0050] If the four-way relay is a normally open relay, the opposite is true. When the switch is working normally, the main control chip will not send an electrical signal to the normally open relay to put it in a disconnected state. However, when the network connection signal cannot be detected due to reasons such as the switch chip being powered off, the main control chip sends an electrical signal to the normally open relay to put it in a connected state.

[0051] In this embodiment, when the switch chip fails for some reason, such as a problem with the switch chip, a short circuit, etc., the third network port will be unable to detect the network signal, and the main control chip will close the four-way relay and disconnect the five-way relay, thereby filtering the node from the daisy chain and isolating the node.

[0052] Taking node 3 as an example, the working principle of this solution is as follows:

[0053] When node 3 is working normally, that is, the line is powered on normally, and the main control chip can detect the network signal, the single-way relay / five-way relay is powered on and is in a closed state. At this time, the main control chip and the switch communicate normally, the four-way relay is powered on and is in a disconnected state, and the two network ports are working normally. At this time, the node is connected to the daisy chain and works normally.

[0054] When an error occurs in node 3, the single-channel relay / five-channel relay is disconnected, the four-channel relay is closed to connect the four signal lines of the dual network ports, the external Ethernet is disconnected from the error node, and nodes 2 and 4 will automatically connect by skipping node 3. In the event of a single point error, the daisy chain can automatically remove the error node without affecting the use of the entire system.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways without departing from the spirit of the present invention.

[0056] Although the terminology such as first electric control switch, second electric control switch, four-way relay, single-way relay, five-way relay, switch node, main control chip, switch chip, switch chip power supply is often used in this article, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model. It is contrary to the spirit of the utility model to interpret them as any additional restrictions.

Claims

1. A daisy chain topology structure capable of automatically filtering error nodes, comprising a plurality of switch nodes, each of which comprises a main control chip, a switch chip and a switch chip power supply, characterized in that: The switch chip is connected with a first network port and a second network port, and is connected to an upper node of the daisy chain through the first network port, and is connected to a lower node of the daisy chain through the second network port to access the daisy chain; A first electronically controlled switch is connected between the first network port and the second network port, and is used to short-circuit the first network port and the second network port through the first electronically controlled switch when the switch node is abnormal.

2. The daisy chain topology structure capable of automatically filtering error nodes according to claim 1, characterized in that: The first electric control switch is a normally closed relay, and the control end of the normally closed relay is connected to the switch chip.

3. The daisy chain topology structure capable of automatically filtering error nodes according to claim 1, characterized in that: The control end of the first electric control switch is connected to the main control chip.

4. The daisy chain topology structure capable of automatically filtering error nodes according to any one of claims 1 to 3, characterized in that: The main control chip is connected to the switch chip and is used to detect the network connection signal of the switch node.

5. The daisy chain topology structure capable of automatically filtering error nodes according to claim 4, characterized in that: The first electric control switch is a four-way relay, and the first network port and the second network port respectively have four signal lines; The four input ends of the four-way relay are connected to the four signal lines of the first network port, and the four output ends are connected to the four signal lines of the second network port. There are controlled switches between the four input ends and the four output ends, which are used to connect the first network port and the second network port when the switch node is abnormal.

6. The daisy chain topology structure capable of automatically filtering error nodes according to claim 4, characterized in that: A second electric control switch is connected between the switch chip power supply and the switch chip, and the second electric control switch is connected to the main control chip so that the main control chip controls the power supply of the switch chip to be disconnected or connected.

7. The daisy chain topology structure capable of automatically filtering error nodes according to claim 6, characterized in that: The second electric control switch is a single-channel relay, and the control end of the single-channel relay is connected to the main control chip; Two ends of the single-channel relay are respectively connected to the switch chip power supply and the switch chip.

8. The daisy chain topology structure capable of automatically filtering error nodes according to claim 6, characterized in that: The second electric control switch is a five-way relay, wherein the first to fourth ways are respectively used to connect the main control chip and the switch chip, and the fifth way is used to connect the switch chip and the switch chip power supply.

9. The daisy chain topology structure capable of automatically filtering error nodes according to claim 8, characterized in that: The two ends of each of the five-way relays are controlled switches controlled by the main control chip.

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