CN114563962A

CN114563962A - Foundation field bus redundancy method and device

Info

Publication number: CN114563962A
Application number: CN202111669827.8A
Authority: CN
Inventors: 陈军伟; 张晓刚; 潘潇; 陈银桃
Original assignee: Zhejiang Supcon Technology Co Ltd
Current assignee: Zhejiang Supcon Technology Co Ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-31
Also published as: WO2023125994A1

Abstract

The invention discloses a foundation fieldbus redundancy method and a device, comprising a plurality of FF interface modules for generating and primarily modulating messages; the FF redundant bus is connected with the FF interface module and performs message transmission; the Y-type FF network segment protector is connected with the FF redundant bus and performs secondary message modulation; the downstream instrument is used for receiving the message and performing signal feedback; each FF interface module generates and primarily modulates a message and then sends the message to an FF redundant bus; the Y-type FF network segment protector receives all the messages, selects one message according to a negotiation mechanism, decodes the message, carries out secondary modulation, and sends the message after secondary modulation to a downstream instrument; according to the invention, a plurality of FF interface modules and a plurality of FF redundant buses are arranged, each FF redundant bus operates independently and is wired separately, the reliability of FF communication is improved, when one bus of FF has a plurality of fault points, the other bus is not affected at all, and the normal communication of the whole FF can be ensured.

Description

Foundation field bus redundancy method and device

Technical Field

The invention relates to the technical field of communication, in particular to a foundation fieldbus redundancy method and device.

Background

FF (Foundation Fieldbus) uses IEC61158-2 physical layer standard, and FF has wide application abroad, and has more and more application cases in the process industry in recent years in China. But basically adopts a single bus topology.

Conventional FF applications have the following component composition:

1) and the FF interface module: the FF is connected to an interface module of the DCS system to realize the conversion of an FF protocol and a DCS internal protocol;

2) an FF power regulator: the power supply of a plurality of FF meters on a network segment is completed, a special FF distributor is required to bear the power supply, and each bus is required to be provided with an FF power regulator (which can be configured in a redundant way);

3) FF junction box: the connection between all FF bus branches and a main line is completed in a junction box, a built-in branch protector (also called a junction module or a network segment protector) or an FF bus safety barrier is configured in the junction box, the main line is connected with an FF power supply regulator at the side of a system cabinet, and instruments are connected with the bus branches (one instrument is connected with one branch);

4) FF bus cable: generally, a type A cable is adopted, and the main cable and the branch cable are of the same type.

The single-bus mode may cause the shutdown of part or even the whole FF network when the FF interface module, the FF network component are damaged (FF power supply regulator, FF segment protector/FF bus safety grid), the bus is disturbed or the FF cable is damaged/poorly connected, which greatly limits the popularization and application of the FF fieldbus.

The bus redundancy topology in the prior art is shown in fig. 2, the bus topology is a ring network topology, the AFD is a bus junction box, and the AFD in the scheme is required to be an intelligent device and can detect the fault conditions of two ring network ports: 1. when one ring network port is in fault, a terminal resistor in the ring network is started, so that the ring network is enabled to be a physically independent bus to be normally used; 2. when the ports of the two ring networks have no faults, the internal terminal resistors are not started, and the fact that the whole ring network is only started by the two terminal resistors on the PA link is guaranteed.

The siemens scheme is a typical ring network structure, and the structure has the defect that only one fault point can be allowed, and if two fault points occur in the ring network, partial meters and even the whole bus meter are lost.

Disclosure of Invention

The invention mainly solves the problem that the FF bus redundant topology is lacked in the prior art; a foundation fieldbus redundancy method and apparatus is provided.

The technical problem of the invention is mainly solved by the following technical scheme: a foundation fieldbus redundancy method comprising the steps of: each FF interface module generates and primarily modulates a message and then sends the message to an FF redundant bus; and the Y-type FF network segment protector receives all the messages, selects one message according to a negotiation mechanism, decodes the selected message, performs secondary modulation, and sends the secondarily modulated message to a downstream instrument. The FF communication system is provided with the FF interface modules and the FF redundant buses, each FF redundant bus operates independently and is wired separately, the reliability of FF communication is improved, when one bus of the FFs has a plurality of fault points, the other bus is not influenced completely, and the normal communication of the whole FF can be ensured.

Preferably, the downstream instrument receives the message and then performs signal feedback; the Y-type FF network segment protector is provided with CPUs the number of which is the same as that of FF interface modules, and each CPU receives a signal fed back by a downstream instrument; after the CPU analyzes the feedback signals, the CPU sends the analysis signals to the FF redundant bus; and the FF interface module receives the resolution signal transmitted by the FF redundant bus.

Preferably, the FF redundant bus is provided with the same number of buses as the FF interface modules.

Preferably, the FF interface module selects an analysis signal transmitted by one of the buses according to a decision mechanism.

Preferably, the negotiation mechanism is: setting a priority stack and a secondary stack, wherein the selection right of the priority stack is higher than that of the secondary stack, and selecting messages in the same stack according to a first-in first-out principle.

Preferably, the decision mechanism is: and selecting the analytic signals according to the rule of coming before coming.

The invention also provides a foundation fieldbus redundancy device, comprising: a plurality of FF interface modules for generating and primarily modulating messages; the FF redundant bus is connected with the FF interface module and performs message transmission; the Y-type FF network segment protector is connected with the FF redundant bus and performs secondary message modulation; and a downstream instrument for receiving the message and performing signal feedback.

Preferably, the Y-type FF network segment protector is provided with CPUs the number of which is the same as that of FF interface modules.

The invention has the beneficial effects that: by arranging the multiple FF interface modules and the multiple FF redundant buses, each FF redundant bus operates independently and is wired separately, the reliability of FF communication is improved, when one bus of FF has multiple fault points, the other bus is not affected completely, and the normal communication of the whole FF can be ensured.

Drawings

FIG. 1 is a bus redundancy diagram of the present invention.

Fig. 2 is a schematic diagram of a siemens PA bus ring network redundancy in the prior art.

In the figure, 1, a first FF interface module, 2, a second FF interface module, 3, a processing chip, 4, a MAC chip, 5, a first receiving module, 6, a first transmitting module, 7, a second transmitting module, 8, a power distribution module, 9, a power distribution modulation module, 10, a terminal, 11, a bus B, 12, a bus a, 13, a second receiving module, 14, a third transmitting module, 15, a first CPU, 16, a second CPU, 17, a third receiving module, 18, a fourth transmitting module, 19, a downstream meter, 20, and a base.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.

It is noted that in the following description, reference is made to the accompanying drawings which illustrate several embodiments of the present invention. It is to be understood that other embodiments may be utilized and that mechanical, structural, electrical, and operational changes may be made without departing from the spirit and scope of the present invention. The following detailed description is not to be taken in a limiting sense, and the scope of embodiments of the present invention is defined only by the claims of the issued patent. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Spatially relative terms, such as "upper," "lower," "left," "right," "lower," "below," "lower," "above," "upper," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature as illustrated in the figures.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," "retained," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and/or "including" specify the presence of stated features, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, operations, elements, components, items, species, and/or groups thereof. It should be further understood that the terms "or" and/or "as used herein are to be interpreted as being inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions or operations are inherently mutually exclusive in some way.

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

Example (b): a foundation fieldbus redundant device comprises a plurality of FF interface modules used for generating and carrying out primary modulation messages; the FF redundant bus is connected with the FF interface module and performs message transmission; the system comprises a Y-type FF network segment protector which is connected with an FF redundant bus and modulates secondary messages and a downstream instrument which is used for receiving the messages and feeding back signals, wherein the Y-type FF network segment protector is provided with CPUs (central processing units) with the same number as that of FF interface modules, and the FF redundant bus is provided with buses with the same number as that of the FF interface modules; the FF interface module can be configured in a redundant way or in a single module way; the present invention is described by taking two FF interface modules configured in a redundant manner as an example, and as shown in fig. 1, the present invention includes a first FF interface module 1, a second FF interface module 2, a bus a12, a bus B11, a power regulator, a base 20, a Y-type FF network segment protector and a downstream meter 19, wherein the first FF interface module, the second FF interface module and the Y-type FF network segment protector are respectively connected with the bus a and the bus B, the power regulator is installed in the base, the first FF interface module and the second FF interface module are installed on the base, and the power regulator supplies power to devices connected to the bus a and the bus B.

The power supply regulator comprises a power distribution modulation module 9 and a terminal 10, wherein the terminal is used for adjusting and displaying power supply conditions, and the power distribution modulation module is respectively connected with the terminal and a bus A or a bus B.

The first FF interface module and the second FF interface module respectively comprise a processing chip 3, an MAC chip 4, a first receiving module 5, a first sending module 6, a second sending module 7 and a power distribution module 8, the power distribution module is used for providing power supply voltage, the processing chip is used for generating messages, the MAC chip is connected with the processing chip and used for modulating the messages, the modulated messages are transmitted to a bus B through the first sending module, the modulated messages are transmitted to a bus A through the second sending module, feedback signals on the bus A and the bus B are transmitted to the MAC chip through the first receiving module, and the feedback signals are transmitted to the processing chip after being modulated by the MAC chip.

The Y-type FF network segment protector is arranged in a junction box, supplies power through a bus A and a bus B and can be expanded and cascaded, the Y-type FF network segment protector comprises a first CPU15, a second CPU16, a second receiving module 13, a third receiving module 17, a third sending module 14 and a fourth sending module 18, the second receiving module is respectively connected with the first CPU and the second CPU, the first CPU and the second CPU receive messages of the bus A or the bus B, the first CPU and the second CPU send feedback signals to the bus A or the bus B through the third sending module, the first CPU and the second CPU receive feedback signals of a downstream instrument through the third receiving module, and the first CPU and the second CPU send messages to the downstream instrument through the fourth sending module.

The invention also provides a foundation fieldbus redundancy method, which comprises the following steps:

each FF interface module generates and primarily modulates a message and then sends the message to an FF redundant bus;

the Y-type FF network segment protector receives all the messages, selects one message according to a negotiation mechanism, decodes the message, carries out secondary modulation, and sends the message after secondary modulation to a downstream instrument;

the downstream instrument receives the message and then carries out signal feedback;

the Y-type FF network segment protector is provided with CPUs the number of which is the same as that of FF interface modules, and each CPU receives a signal fed back by a downstream instrument;

after the CPU analyzes the feedback signals, the CPU sends the analysis signals to the FF redundant bus;

the FF interface module receives an analysis signal transmitted by an FF redundant bus;

the FF interface module selects an analytic signal transmitted by one bus according to a decision mechanism;

the negotiation mechanism is as follows: setting a priority stack and a secondary stack, wherein the selection right of the priority stack is higher than that of the secondary stack, and selecting messages in the same stack according to a first-in first-out principle;

the decision mechanism is as follows: and selecting the analytic signals according to the rule of coming before coming.

The bus redundancy method of the present invention is exemplified in detail below in conjunction with two FF interface modules:

when the FF interface module sends message data, the processing chip generates a sending message to the MAC chip, and the MAC chip modulates two same message data packets and sends the message data packets to the A buses B of the bus.

Two CPUs of the Y-type FF network segment protector both receive the message data packet sent by the FF interface module, and the two CPUs negotiate to determine which CPU remodulates the message data packet and then sends the message data packet to a downstream instrument.

The negotiation mechanism is as follows: the first CPU and the second CPU are put in a priority stack, the first CPU is on the top, the second CPU is on the bottom, the current message data packet is decoded and modulated by the first CPU and then sent to a downstream instrument, when the first CPU has decoding error, the first CPU is put in a secondary stack, when the second message data packet arrives, the second CPU is still in the priority stack, therefore, the second CPU is decoded and modulated and then sent to the downstream instrument, when the second CPU also has decoding error, the second CPU is put in the secondary stack, and because the first CPU enters first, the next time is decoded and modulated by the first CPU preferentially, at the moment, the priority stack has no CPU, the priority stack is put in a next level, the priority is lowered to the back of the secondary stack, and the steps are repeated.

And after receiving the message data packet, the downstream instrument feeds back a corresponding message B according to the protocol, and the two CPUs of the Y-type FF network segment protector simultaneously analyze the message B and simultaneously send the message B to the bus A and the bus B.

After the first FF interface module and the second FF interface module receive the messages of the bus a and the bus B, the processing chip determines to use the message B of the bus a or the bus B through a decision mechanism, wherein the decision mechanism is as follows: and when the message B which arrives firstly is the message B of the bus A and the message is normal, the message B transmitted by the bus A is used, if the message B transmitted by the bus B arrives firstly and is normal, the message B transmitted by the bus B is used, and if the message B of the bus A which arrives firstly is abnormal, the message B of the bus B is used.

Based on the setting of the bus redundancy device of the invention, the failure on the redundancy bus is divided into: 1) single FF interface module level failure; 2) a single transmission/reception circuit failure of the FF interface module; 2) a single FF bus fault; 3) a single FF power regulator failure; 4) one path of fault of a main trunk of the Y-shaped FF section protector; 2 or even a plurality of fault points appear on the single-side FF bus, and the normal operation of the bus is not influenced; the Y-shaped FF section protector can correct FF signals through the MCU and control the flow direction of the signals, can filter interference of a main trunk, ensures the integrity of branch signals and greatly improves the anti-interference performance of a bus.

The FF redundant bus provided by the invention operates independently, and the two buses are wired separately, so that the reliability of FF communication is improved; when one bus of the FF has a plurality of fault points, the other bus is not influenced at all, and the normal communication of the whole FF can be ensured; the FF interface module can transform the existing 2 network segment module into a single network segment redundancy module, and only needs to upgrade the embedded curing program, thereby reducing the development cost.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.

Claims

1. A foundation fieldbus redundancy method, comprising the steps of:

and the Y-type FF network segment protector receives all the messages, selects one message according to a negotiation mechanism, decodes the message, then carries out secondary modulation, and sends the message after secondary modulation to a downstream instrument.

2. A Foundation Fieldbus redundancy method according to claim 1,

and the FF interface module receives the resolution signal transmitted by the FF redundant bus.

3. A Foundation Fieldbus redundancy method according to claim 2,

the FF redundant bus is provided with buses with the same number as the FF interface modules.

4. A Foundation Fieldbus redundancy method according to claim 3,

and the FF interface module selects one of the analysis signals transmitted by the buses according to a decision mechanism.

5. A Foundation Fieldbus redundancy method according to claim 1, 2 or 3,

the negotiation mechanism is as follows: setting a priority stack and a secondary stack, wherein the selection weight of the priority stack is higher than that of the secondary stack, and selecting messages in the same stack according to the first-in first-out principle.

6. A Foundation Fieldbus redundancy method according to claim 4,

the decision mechanism is as follows: and selecting the analytic signals according to the rule of coming first and coming second.

7. A foundation fieldbus redundancy device, comprising:

a plurality of FF interface modules for generating and primarily modulating messages;

the FF redundant bus is connected with the FF interface module and performs message transmission;

the Y-type FF network segment protector is connected with the FF redundant bus and performs secondary message modulation;

and the downstream instrument is used for receiving the message and performing signal feedback.

8. A Foundation Fieldbus redundancy arrangement, according to claim 7,

the Y-type FF network segment protector is provided with CPUs the number of which is the same as that of FF interface modules.

9. A Foundation Fieldbus redundancy arrangement according to claim 7,