CN111404795B - Bus type topology network node layout method - Google Patents
Bus type topology network node layout method Download PDFInfo
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- CN111404795B CN111404795B CN202010216166.2A CN202010216166A CN111404795B CN 111404795 B CN111404795 B CN 111404795B CN 202010216166 A CN202010216166 A CN 202010216166A CN 111404795 B CN111404795 B CN 111404795B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40247—LON
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention discloses a bus type topological network node layout method, which comprises the steps of S1, determining terminal power P,Lowest operating voltage U of terminal L The host outputs a supply voltage U to the terminal CC The bus line type used by engineering and the resistance r of the bus per meter; s2, determining the number N of terminals used in the layout in the tested environment and the distance X between the host and the nearest terminal 1 And the distance X when the terminals are distributed at equal intervals 2 One of the three parameters, a plurality of combinations of the other two parameters are calculated. Therefore, the bus type topological network node layout method designer only needs to provide the number N of terminals actually installed and expected to be used in the layout and the distance X between the host and the nearest terminal 1 Distance X between terminals 2 Any two of the three parameters can obtain the third parameter to be obtained according to the method, obtain the required installation information, and compare with the plane layout of the tested environment to obtain the installation layout.
Description
Technical Field
The invention relates to the field of bus type topological networks, in particular to a bus type topological network node layout method.
Background
With the rapid development of modern society, people continuously put forward new demands on improvement of living conditions and safety of public environments, and put forward more recent and higher requirements on automation and intellectualization of buildings. When a bus type topological system with a master-slave structure is required to be installed on a building site, wherein the bus type topological system is formed by networking through 485 buses or LonWorks networks and the like, and the power is supplied to terminals through a host, how to most effectively arrange terminal nodes in the system is a particularly important problem. For example, in an underground garage or other environment monitoring places, routing layouts such as super-5-type network cables and conventional twisted pair cables are mostly adopted as a wiring system based on information transmission, and the design key points are as follows: the central machine room host is used as a core, and each layer of distribution frame of the underground garage and the central machine room are connected into an organic whole, so that the system has the characteristics of stability, reliability, high speed, standard, openness and flexibility, but no referential standard or layout method exists for installing terminal nodes in the engineering, and the application requirements of wiring of different systems cannot be met.
In the prior art, no article and a design institute can be referred to for installation regulation regulations, and a designer needs to make a corresponding scheme according to certain factors, lacks a uniform standard, and needs to actually investigate and investigate the corresponding scheme additionally. The construction personnel install the node at job site at will, and the installation number is walked the line distance and is selected wantonly, does not conform to the installation demand of user, makes the unable normal work of system cause unnecessary trouble, probably influences people normal life and public safety.
Therefore, designing a layout method of bus-type environmental monitoring nodes becomes one of the problems that needs to be solved urgently when installing terminal nodes in the current engineering.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a bus topology network node layout method is provided.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a bus type topology network node layout method comprises the following steps:
s1, determining power P of a terminal and the lowest working voltage U of the terminal L Actual voltage U output by the host to the terminal CC The bus line type used by engineering and the resistance r of the bus per meter are adopted;
s2, determining the number N of terminals used for layout in the tested environment and the distance X between the host and the nearest terminal according to the following calculation model 1 And the distance X when the terminals are distributed at equal intervals 2 One of the three parameters, various combinations of the other two parameters were calculated:
wherein U is T Outputting theoretical voltage to the terminal for the host; x 1 The distance between the host and the first terminal; x 2 The distance between the terminals is defined as the distance between the terminals; r is the resistance per meter of the bus used; u shape i I =1,2, \8230;, N, where U is the voltage of the ith terminal 1 Is the terminal farthest from the hostThe voltage of the terminal; r is the equivalent resistance of a communication interface circuit in the terminal; p is the terminal power.
And S3, determining optimized installation layout parameters.
The bus type topological network is a system with a master-slave structure, and a host supplies power to the terminal.
Compared with the prior art, the invention has the following technical effects:
after the adopted equipment model and bus type are determined, two of three parameters, namely the distance from a host to a first terminal, the distance between the terminals and the terminal and the number of the terminals to be distributed, are given, and then a third parameter can be obtained through calculation, or one parameter is set, and multiple combinations of the other two parameters are calculated, so that the blind laying is not performed when a line is laid, the terminal is not laid too densely, the resource waste is caused, or the layout is too sparse, and the use requirement on the site cannot be met.
On the basis of the technical scheme, the invention can be further improved as follows.
Preferably, the operating voltage U of the terminal furthest from the host 1 Is the lowest working voltage U of the terminal L 。
The beneficial effect of adopting the further scheme is that the maximum network scale can be obtained.
Preferably, the distance X between a given host and the terminal closest thereto 1 Given an equidistant distribution, the terminal pitch X 2 And calculating the maximum number N of terminals which can be mounted on the host by using a maximum derivation method.
The beneficial effect of adopting the further scheme is that the distance X is given 1 And the distance X 2 And confirming the number N of the mountable terminals, so that whether the equipment type selection can meet the field requirement can be known.
Preferably, given the number of terminals N on which the host is mounted, given the equidistant distribution, the terminal spacing X is 2 The distance X between the host and the terminal closest to the host can be derived and calculated by an optimization equation 1 。
Adopt the above-mentioned advance oneThe step scheme has the beneficial effect that the number N and the distance X of the terminals are given 2 Thus, the distance X between the host and the nearest terminal can be known 1 And judging whether the field condition meets the requirements, namely whether the distance from the main machine room to the workplace can meet related requirements and whether the equipment type selection is appropriate.
Preferably, given the number of terminals N on which the host is mounted, the distance X between the host and the terminal closest thereto 1 And the terminal distance X in equal-distance distribution can be obtained by derivation calculation through an optimization equation 2 。
The beneficial effect of adopting the further scheme is that the number N of the terminals and the distance X between the host and the nearest terminal are given 1 The distance X between the terminals under the condition of maximum mounting of the system can be obtained 2 And accurate wiring is realized during construction, resource waste caused by excessively dense terminal setting is avoided, and the problem that the system cannot drive all terminals to work due to excessively large wiring intervals is avoided.
Preferably, the bus type topology network is a topology network of a master-slave structure powered by a 485 bus or a LonWorks network.
The beneficial effects of adopting the further scheme are that the technology is mature, and the wiring construction is easy.
In the engineering wiring, the receiving and sending distances of the communication lines must be equal, otherwise, the information fed back by the terminal may not be received normally.
Drawings
FIG. 1: the invention discloses a bus type network topological structure and a terminal wiring schematic diagram;
FIG. 2 is a schematic diagram: calculating R implementation wiring diagram;
FIG. 3: the invention discloses a flow chart of a bus type network topology node layout method.
In the drawings, the parts names represented by the respective reference numerals are listed as follows:
1. a host; 2. a terminal; 2-1, a first terminal; 2-2, a second terminal; 2- (n-1), n-1 terminal; 2- (n), nth terminal; 3. a twisted pair; u shape CC The actual voltage output to the terminal by the host computer; u shape T The host outputs theoretical voltage to the terminal;u, measuring voltage actually by the terminal; x 1 The distance between the host and the nearest terminal; x 2 : the distance between adjacent terminals; i; the operating current.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
FIG. 1 is a schematic diagram showing a bus-type network topology and terminal wiring, in which a host 1 supplies power to terminals 2-1-2- (n) through a network cable 3 or other twisted pair, and the distance between the host 1 and the terminal 2- (n) closest to the host is X 1 The supply voltage provided by the host 1 is directly applied to the power supply, and the generated large current cannot be ignored. The terminals are also connected by twisted pair lines and the distance between the terminals is X 2 。
For example, fig. 2 is an example diagram of calculating an equivalent resistance (in ohm) R of a communication interface circuit in a terminal, only one terminal 2 is connected to a host 1, and a control voltage U from the host 1 to the terminal 2 is obtained through actual measurement CC The twisted pair current I and the actual voltage U of the terminal 2 end can be obtained by the formula (2):
in the formula, r is the resistance of the used bus per meter (the unit is ohm per meter); u is the actual voltage of the terminal (in volts) measured in fig. 2; x 1 Distance (in meters) from the host to the terminal closest to the host; i is the current (in amperes) within the twisted pair; u shape CC Is the actual voltage (in volts) output by the host to the terminal.
When a designer arranges a master-slave system powered by a 485 bus and a LonWorks network in a bus type network topology structure, the number N of mountable terminals and the distance X from a host to the nearest terminal can be set according to the formula (1) 1 Distance X between adjacent terminals 2 And when any two of the three parameters are adopted, obtaining a third parameter.
Wherein U is T For the calculated voltage at the host side (in volts), U T ≦U CC ；X 1 Distance (in meters) between the host and the first terminal; x 2 Is the distance between adjacent terminals (in meters); r is the resistance per meter of the bus used (in ohms per meter); u shape i I =1,2, \8230;, N (in volts) where U is the voltage across the ith terminal 1 The voltage (in volts) of the terminal furthest from the host; r is the equivalent resistance (in ohm) of the communication interface circuit in the terminal; p is the terminal power (in watts). R is generally found to be small and negligible in the actual measurement process.
Operating voltage U at terminal furthest from host 1 Is the lowest working voltage U of the terminal L When the system has the largest service range, the most loads can be carried, if the terminals are distributed at equal intervals and the interval is X 2 The supply voltage U of each terminal is then at the optimum state of the bus system i Can be obtained from the formula (3),
wherein j is a natural number, 1 ≦ j ≦ i-1.
The present patent is further illustrated by the following examples, which do not limit the patent in any way, and any modifications or changes which can be easily made by a person skilled in the art without departing from the technical solution of the present patent will fall within the scope of the claims of the present patent.
The first embodiment is as follows:
when the distance X from the host in the host room to the terminal closest to the host in the construction site 1 And the distance X between terminals 2 The method can be determined through a design drawing, when the number N of the installation terminals is required, supposing that an ultra-5-type network cable is adopted, the resistance r per meter of the general network cable is about 1 omega/m, and at the moment, the terminal is taken for convenient calculationThe power P is 50mW, and the actual voltage U output to the terminal by the host CC Is 24V, X 1 、X 2 May take any value, X 1 、X 2 The given values can be filled and selected according to the actual plan of the field, and calculated according to the formula (1) to obtain the wiring scheme information table diagram as shown in the table 1, and the corresponding X is given 1 And X 2 And obtaining the number N of the installation terminals, and then installing the equipment by contrasting the planar design drawing of the construction site.
TABLE 1
The second embodiment:
when the distance X from the host in the host room to the terminal closest to the host in the construction site 1 And the distance X between terminals 2 The number of the installation terminals N is determined by a design drawing, and if the number of the installation terminals N is required, the RVVP 3X 1.5mm2 conventional twisted pair is assumed to be adopted on site, the resistance per hundred meters of the twisted pair is 9.38 omega/hundred meters, and the resistance of the twisted pair is smaller than that of a network cable, so that X is X 1 、X 2 Can be amplified by several times, in this case, for the convenience of calculation, the power P of the terminal is taken as 50mW, and the actual voltage U output to the terminal by the host is taken as CC Is 24V, X 1 、X 2 Can take any value, X 1 、X 2 The given values can be filled and selected according to the actual plan of the monitored environment, calculated according to the formula (1) to obtain the wiring scheme information table diagram as shown in the table 2, and given the corresponding X 1 And X 2 And obtaining the quantity N of the installation terminals, and then installing the equipment by contrasting the planar design drawing of the construction site.
TABLE 2
Note that in actual construction, X is considered in the case of the first and second embodiments 1 Maximum and minimum values, X 2 Maximum and minimum, according to the actual engineering requirements, obtaining maximum utilization rate of N, and actually applyingIf the number of the installed terminals is less than or equal to N in the process, the system can operate reliably; if the number of the installation is larger than N, the system operation is influenced by relevant factors such as voltage.
Example three:
when the number N of the installation terminals on the construction site is equal to the distance X between the adjacent terminals 2 The distance X from the main to the terminal closest to the main in the main machine room is determined through a design drawing 1 In the process, the formula (3) can also be adopted for calculation, supposing that an ultra-5-type network cable is adopted, the resistance r per meter of the network cable is about 1 omega/m, at the moment, for convenience of calculation, the power P of the terminal is taken as 50mW, and the actual voltage U output to the terminal by the host is adopted CC Is 24V, N, X 2 Can take any value, N, X 2 The given values can be selected according to the actual plan of the monitored environment, calculated according to the formula (1) to obtain the wiring scheme information table diagram shown in the table 3, and given the corresponding N and X 2 Obtaining the proper distance X from the installed host to the nearest terminal 1 Then, the equipment is installed against the floor plan of the construction site.
TABLE 3
In actual construction, the maximum and minimum values of N, X, are also considered 2 Maximum and minimum values, here X 2 To obtain X according to the equal spacing distance artificially regulated by actual engineering 1 The maximum wiring distance of. If the wiring distance from the host to the first terminal is less than or equal to the obtained X in actual construction 1 The system will operate reliably; if the wiring distance from the host to the first terminal is greater than X 1 The operation of the system is affected by voltage and other relevant factors.
Example four:
when the distance X from the host in the host room to the terminal closest to the host in the construction site 1 The number N of the installed terminals can be determined through a design drawing, and the distance X between the terminals is required to be obtained 2 In time, assume that the scene takes super 5 types of network cables, each of whichThe meter resistance r is about 1 omega/m, the power P of the terminal is taken as 50mW for convenient calculation, and the actual voltage U output to the terminal by the host is CC Is 24V, X 1 Can take any real number, N can take any natural number, X 1 The values given by N can be selected according to the actual plan view of the monitored environment, calculated according to the formula (1) to obtain the wiring scheme information table diagram shown in the table 4, and given the corresponding X 1 And N, obtaining the distance X between the terminals 2 Then, the equipment is installed against the floor plan of the construction site.
TABLE 4
In actual construction, the maximum value and the minimum value of N, X, are also considered 1 Maximum and minimum values, here X 1 For the distance from the host to the nearest terminal, find X 2 The maximum wiring distance of. If the equidistant distance between the terminals is less than or equal to the solved X in the actual construction 2 The system will run reliably; if the equal spacing distance between the terminals is larger than the obtained X 2 The operation of the system is affected by voltage and other relevant factors.
Generally, when a 485 bus layout of super 5-type network line transmission is adopted, it is assumed that an equivalent resistance R of a communication interface line in a terminal is 0.6 Ω, a resistance R per meter of the bus is 1 Ω/m, a terminal power P is 50mW, and a lowest working voltage U of the terminal is provided L Is 7V, the actual voltage U output by the host to the terminal CC At 24V, when the wiring distance between the terminals is below 25 m by referring to an actual site plan design drawing, the effective distance between the host and the farthest terminal of the connection is about 500 m, the terminal matching impedance is required when the total connection distance exceeds 280 m, the distance between the host and the terminal closest to the host is not more than 200 m at most, and the effect is that the shorter the distance is, the better the effect is.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A method for bus topology network node layout is characterized in that,
s1, determining power P of a terminal and the lowest working voltage U of the terminal L The host outputs the supply voltage U to the terminal CC The bus line type used by engineering and the resistance r of the bus per meter;
s2, determining the number N of terminals mounted with the host used for layout in the tested environment and the distance X between the host and the terminal closest to the host according to the following calculation model 1 And the distance X when the terminals are distributed at equal intervals 2 One of the three parameters, various combinations of the other two parameters were calculated:
wherein, U T Outputting theoretical voltage to the terminal for the host; x 1 The distance between the host and the terminal closest to the host; x 2 The distance between the terminals is defined as the distance between the terminals; r is the resistance per meter of the bus used; u shape i I =1,2, \ 8230; \ 8230;, N, where U is the operating voltage of the ith terminal 1 The working voltage of the terminal farthest from the host; r is the equivalent resistance of a communication interface circuit in the terminal; p is the terminal power;
s3, determining optimized installation layout parameters; the number N of terminals mounted by a given host and the distance X between the host and the terminal closest to the host 1 And the distance X when the terminals are distributed at equal intervals 2 Determining another parameter from any two of the three parameters;
working voltage U of terminal farthest from host 1 Is the lowest working voltage U of the terminal L 。
2. The method of claim 1, wherein the distance X between a given host and the nearest terminal is the distance X between the given host and the nearest terminal 1 Given an equidistant distribution, the terminal pitch X 2 Derivation of the maximumAnd calculating to obtain the maximum number N of terminals which can be mounted on the host.
3. The method of claim 1, wherein given the number of terminals N mounted on the host and given the equidistant distribution, the terminal spacing X is given 2 The distance X between the host and the terminal closest to the host can be derived and calculated by an optimization equation 1 。
4. The method of claim 1, wherein the number of terminals N mounted on a given host, the distance X between the given host and the terminal closest thereto, is given by the number of terminals N mounted on the given host 1 And the terminal distance X in equal-distance distribution can be obtained by derivation calculation through an optimization equation 2 。
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| CN102411645A (en) * | 2011-07-28 | 2012-04-11 | 中国电力科学研究院 | Rural electric network layout optimization method based on urban and rural integration |
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| CN100454848C (en) * | 2007-03-07 | 2009-01-21 | 华为技术有限公司 | Network structure topology layout method and network management device |
| EP3139639A1 (en) * | 2015-09-04 | 2017-03-08 | Music Group IP Ltd. | Method for determining a connection order of nodes on a powered audio bus |
| CN106249628B (en) * | 2016-08-30 | 2019-07-26 | 深圳市欧瑞博电子有限公司 | A kind of smart machine installation site automatic recognition system and method |
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| CN102411645A (en) * | 2011-07-28 | 2012-04-11 | 中国电力科学研究院 | Rural electric network layout optimization method based on urban and rural integration |
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| 孙君洋 ; 朱淼 ; 高强 ; 蔡旭 ; .大型海上交流风电场内部拓扑优化设计.电网技术.2013,(07),全文. * |
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