CN219087145U

CN219087145U - Looped network redundant field bus controller

Info

Publication number: CN219087145U
Application number: CN202223267450.6U
Authority: CN
Inventors: 叶炳金; 晁婷婷; 周艳芝
Original assignee: Suzhou Tokomm Automation Technology Co ltd
Current assignee: Suzhou Tokomm Automation Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-05-26
Anticipated expiration: 2032-12-07

Abstract

The embodiment of the utility model discloses a looped network redundant field bus controller, which comprises a core card and two field cards, wherein the core card is provided with two DCS communication interfaces, an HMI communication interface, two power interfaces, an interface isolation and signal processing circuit, a power isolation circuit and an MCU module; each field card comprises a plurality of field bus interfaces, an interface isolation and signal processing circuit and an MCU module, wherein each field bus interface is connected with the corresponding interface isolation and signal processing circuit, and the interface isolation and signal processing circuit is connected with the MCU module.

Description

Looped network redundant field bus controller

Technical Field

The utility model relates to the field of industrial control, in particular to a looped network redundant field bus controller.

Background

The field bus controller is the core of the industrial field bus control system, and the task of the field bus controller is to manage the use of buses, including the management of devices on the buses and the process management of the devices using the buses. In an industrial field bus network, a large number of network devices exist, a controller is required to perform centralized control, if the controller fails, the whole network is paralyzed, so that the stability and reliability of the controller are particularly important. For the network managed by the controller, because the condition of the industrial field is complex, if the cable is damaged or the network equipment is failed, the network may be interrupted. The stringent requirements and harsh field environments present very high challenges to the reliability of fieldbus control.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide a looped network redundant field bus controller, which is characterized in that redundant interfaces are added, field devices are formed into a loop network, and the loop network is automatically switched to other interfaces for connection when the network fails or the field devices fail, so that the reliability of the network is improved.

The embodiment of the utility model discloses a looped network redundant field bus controller, which comprises a core card and two field cards, wherein the core card is provided with two DCS communication interfaces, an HMI communication interface, two power interfaces, an interface isolation and signal processing circuit, a power isolation circuit and an MCU module;

each field card comprises a plurality of field bus interfaces, an interface isolation and signal processing circuit and an MCU module, wherein each field bus interface is connected with the corresponding interface isolation and signal processing circuit, and the interface isolation and signal processing circuit is connected with the MCU module.

Furthermore, two DCS communication interfaces are redundant, and the same set of setting parameters is adopted.

Further, the two power interfaces are input with 100-250V alternating current, and the power interfaces follow the two paths of power isolation circuits to process the input alternating current into direct current with a plurality of gears.

Further, the field card comprises four paths of field bus interfaces, one interface of one field card and one interface of the other field card form a ring network, one interface of the ring network is used as a network starting point, the other interface is used as a network ending point, and field network equipment is mounted between the network starting point and the network ending point; 2 field cards form four independent ring networks.

Further, the core card supplies power to the two field cards through the power bus.

Further, the core card performs data interaction with the field card through the data bus.

In the embodiment of the utility model, for the DCS interface, the power interface and the field bus interface, which are easily affected by the environment and have faults, redundant channels are introduced, seamless switching is performed when the faults occur, two field cards adopt the same structure, and when any one of the two field cards has faults, the other field bus interface can independently complete the field bus layer communication task. Through redundancy design, the utility model can greatly enhance the reliability of the network.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in the figure, the embodiment of the utility model discloses a looped network redundant field bus controller, which comprises a core card 1 and two field cards 2, wherein the core card 1 is provided with two DCS communication interfaces, an HMI communication interface, two power interfaces, an interface isolation and signal processing circuit (namely an interface isolation processing circuit in the drawing), a power isolation circuit and an MCU module, the two DCS communication interfaces and the HMI communication interface are connected with the interface isolation and signal processing circuit, the two power interfaces are connected with the power isolation circuit, and the interface isolation and signal processing circuit and the power isolation circuit are connected with the MCU module;

In an embodiment of the utility model, two DCS communication interfaces are redundant, adopt the same set of setting parameters to be connected with an upper computer DCS, and can be switched to another interface when a single interface fails.

In one embodiment of the utility model, the two power interface inputs are 100-250V alternating current. The two power interfaces of the core card are two independent power supply ports, the input alternating current can be processed into direct current with different gears of 24V,12V,5V and the like through the subsequent power isolation and processing circuits, and when any interface is powered off or any power processing circuit is damaged, the work of the whole controller is not affected, the normal work requirement of the whole controller is met, and the whole controller is supplied to the field card for use through a power bus.

In one embodiment of the utility model, the field card comprises four paths of field bus interfaces, one interface of one field card and one interface of the other field card form a ring network, one interface of the ring network is used as a network starting point, the other interface is used as a network ending point, and field network equipment is mounted between the network starting point and the network ending point; 2 field cards form four independent ring networks. Specifically, if the field bus interfaces 1_1 and 2_1 form a ring network, the interface 1_1 is used as a network starting point, the interface 2_1 is used as a network ending point, and the field network equipment is mounted between the two points. The same interfaces 1_2 and 2_2, interfaces 1_3 and 2_3, and interfaces 1_4 and 2_4 form a ring network.

The core card 1 supplies power to the two field cards through a power bus, and performs data interaction with the field cards through a data bus. The core card 1 schedules the operation of two field cards by sending tokens through a data bus, and only one card is allowed to access the network at the same time, so as to prevent conflict when two cards access the network at the same time. At a certain moment, the first field card obtains the token, accesses the field device through the four-way field bus interface concurrently, reports the data obtained by the access device to the core card after the access is completed, and returns the token. The core card then distributes the token to the second field card and subsequent actions such as the first field card, and so on. When the first field card accesses the network, the data of the first field card is received by the second field card, when the second field card receives correct data, the current looped network is determined to be normal, and when the second field card cannot receive the data or the data continuously generates errors, the current looped network is determined to have faults, and the faults are reported to the core card.

When the core card detects that the first field card cannot receive the token, the first field card is determined to have a fault, at the moment, all the four field bus interfaces of the first field card cannot work, and at the moment, the ring network is disconnected, so that a single bus is formed. The core card does not issue a token to the first field card any more, but enables the second field card to directly work at full time, the second field card completes the access of the whole network equipment, at the moment, the equipment of the whole network can be accessed, and the operation of the network equipment is not affected. The same applies when the second field card fails.

When the ring network fails somewhere in the middle, for example, the line is disconnected somewhere in the middle of the ring network formed by the field bus interfaces 1_1 and 2_1. At this time, the first field card can access all devices from the network start point to the line fault point, the second field card can access all devices from the line fault point to the network end point, at this time, the devices of the whole network can be accessed, and the operation of the network devices is not affected.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims

1. The ring network redundant field bus controller is characterized by comprising a core card and two field cards, wherein the core card is provided with two DCS communication interfaces, an HMI communication interface, two power interfaces, an interface isolation and signal processing circuit, a power isolation circuit and an MCU module, the two DCS communication interfaces and the HMI communication interface are connected with the interface isolation and signal processing circuit, the two power interfaces are connected with the power isolation circuit, and the interface isolation and signal processing circuit and the power isolation circuit are connected with the MCU module;

2. A ring network redundant fieldbus controller as claimed in claim 1 in which the two DCS communication interfaces are redundant of each other and employ the same set of setting parameters.

3. The ring network redundant field bus controller of claim 1 wherein the two power interfaces are input with 100-250V ac power, the power interfaces are followed by two power isolation circuits to process the input ac power into dc power for a plurality of gears.

4. The ring network redundant field bus controller of claim 1 wherein the field cards comprise four-way field bus interfaces, one interface of one field card and one interface of the other field card form a ring network, one interface of the ring network is used as a network starting point, the other interface is used as a network ending point, and the network starting point, the network ending point and the field network equipment are mounted therebetween; 2 field cards form four independent ring networks.

5. A ring network redundant fieldbus controller as claimed in claim 1 in which the core card supplies power to both field cards via the power bus.

6. A ring network redundant fieldbus controller as claimed in claim 1 in which the core card is data interactive with the field card via a data bus.