CN106506307B - A kind of Modbus frame format self-described method - Google Patents
A kind of Modbus frame format self-described method Download PDFInfo
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- CN106506307B CN106506307B CN201611198341.XA CN201611198341A CN106506307B CN 106506307 B CN106506307 B CN 106506307B CN 201611198341 A CN201611198341 A CN 201611198341A CN 106506307 B CN106506307 B CN 106506307B
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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
- H04L12/4013—Management of data rate on the bus
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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
- H04L2012/40228—Modbus
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a kind of Modbus frame format self-described methods, including register data type can self-described；Register address low byte can self-described before in preceding or high byte；Register data low byte can self-described before in preceding or high byte；The function code that register, relay, intake read-write are supported can self-described；Register, relay, intake initial address definition can self-described；Register, relay, intake quantity can self-describeds；CRC check low byte can self-described before in preceding or high byte.Slave computer increases Modbus frame format self-description information, and host computer goes calling data according to the self-description information of slave computer and parse data by instruction calling slave computer self-description information, can easily realize communication matching and data parsing matching.Substantially increase in this way between communication apparatus can interconnectivity, increase the versatility and flexibility of upper computer software, reduce the workload of upper computer software change.
Description
Technical field
The present invention is led between industrial control unit (ICU) or using based on Modbus agreement between controller and computer
The occasion of letter；Especially multiple slave computer Modbus protocol frame formats are inconsistent, and host computer must modify program or configuration ability
The application of normal communication.
Background technique
Modbus agreement is applied to a kind of all-purpose language on electronic controller.By this agreement, controller mutually it
Between, controller can communicate via between network (such as Ethernet) and other equipment.It has become a kind of universal industrial mark
It is quasi-.There is it, the control equipment of different vendor's production can be linked to be industrial network, carry out Centralized Monitoring.This protocol defines one
A controller can recognize the message structure used, but regardless of them be communicated by which kind of network.It describes one
Controller requests access to the process of other equipment, how to respond the request from other equipment, and how to detect mistake and remember
Record.It has formulated the common format of message field layout and content.This agreement support traditional RS-232, RS-422, RS-485 and
Ethernet device.Many industrial equipments, including PLC, DCS, intelligence instrument etc. all use Modbus agreement as between them
Communication standard.It is all kinds of using the equipment based on Modbus agreement, but not all equipment based on Modbus agreement
All communicated in strict accordance with identical frame format.Common difference mainly includes following several classes: 1, register data type；2,
Register address low byte is in preceding or high byte preceding；3, register data low byte is in preceding or high byte preceding；4, it posts
The function code that storage, relay read-write are supported；5, register, relay, the definition of intake initial address；6, register, relay
Device, intake quantity；7, CRC check low byte is in preceding or high byte preceding.These differences are all brought to equipment room communication
Inconvenience, the host computer communicated with must modify according to its agreement, could normal communication and parsing data.
Summary of the invention
Deficiency for existing use based on Modbus protocol devices, in order to solve the problems, such as that communication equipment agreement is inconsistent,
And host computer must be modified for different agreement, the drawbacks of reducing integrated efficiency and increase cost, the invention proposes as follows
A kind of new technical solution.
The technical solution adopted by the present invention are as follows: a kind of Modbus frame format self-described method, by being based on to existing
Modbus protocol devices frame format difference summarizes and analyzes, and increases self-description information to difference section.Original communication equipment only needs
Increase the support to self-description information interaction, so that it may easily realize that host computer communicates the adaptive of interconnection with slave computer.It is the next
Machine increases self-description information to above-mentioned inconsistent place；Host computer calls slave computer self-description information by instruction, then root
Calling data are gone again according to the self-description information of slave computer and parse data, can easily realize communication matching and data parsing
Match.The interconnectivity between communication apparatus is substantially increased in this way, reduces the workload of upper computer software change.
Above-mentioned Modbus frame format self-described technical solution, it is further characterized by: register data type can be certainly
Description；Register address low byte can self-described before in preceding or high byte；Register data low byte is in preceding or high word
Section can self-described before；The function code that register, relay, intake read-write are supported can self-described；Register, is opened relay
Entering the definition of amount address can self-described；Register, relay, intake quantity can self-describeds；CRC check low byte is preceding or high
Byte can self-described before.
The invention the utility model has the advantages that the present invention increases the existing equipment based on Modbus in a kind of simple and practical method
Add self-description information, upper computer and lower computer, which need to only increase, can easily realize interconnection to the support of self-description information interaction；
Solve upper computer and lower computer because agreement it is inconsistent can not normal communication, host computer need to modify program or configuration the drawbacks of.
Detailed description of the invention
Fig. 1 is the self-description information interaction diagrams of the embodiment of the present invention.
Specific embodiment
Below by way of specific embodiment, the following further describes the technical solution of the present invention.
It is as follows to define self-description information frame format:
Host computer requests ADU:
| Device address | 1 byte | |
| Function code | 1 byte | 0x71 |
| Check code | 1 byte | 0x5A |
| Cumulative and verification | 1 byte |
Slave computer responds ADU:
Wherein register data type definition is as follows:
| Register data type | Meaning |
| 0 | In vain |
| 1 | 16 signed binaries |
| 2 | 16 unsigned binary numbers |
| 3 | 4 binary-coded decimals |
| 4 | 32 signed binaries |
| 5 | 32 unsigned binary numbers |
| 6 | 8 binary-coded decimals |
| 7 | 32 floating numbers |
| 8 | ASCII character character string |
Individual address tableau format is defined as follows (m=6):
Note: serial number is numbered from 1.
The function code wherein supported accounts for 2 bytes, and low byte is preceding, and high byte is rear；Corresponding position 1 indicates to support this function
Energy code, every is defined as follows:
An existing slave computer supports the communication based on Modbus agreement, device address 1, and register data type is 16
Signed binary, register address high byte preceding, register data low byte preceding, cyclic redundancy check high byte preceding,
Modbus address table and the function code of support are as follows:
| Initial address | Quantity | The function code of support | |
| Relay | 0x0000 | 0x08 | 0x01、0x05、0x0F |
| Discrete intake | 0x2000 | 0xA8 | 0x02 |
| Input register | 0x3000 | 0x2F | 0x03、0x04 |
| Output register | 0x5000 | 0x20 | 0x03、0x06、0x10 |
| Specified register | 0x8000 | 0x05 | 0x03、0x06、0x16 |
Upper computer and lower computer is based on Modbus protocol communication, and to interconnect process automatically as follows:
1, host computer carries out calling self-description information according to process shown in Fig. 1, and it is as follows that host computer sends message:
0x01 0x71 0x5A 0xCC//device address, function code, check code, cumulative and verification
2, slave computer receives host computer message, and after judging address and cumulative and verification correctly, response message is as follows:
0x01 0x71 0x5A//device address, function code, check code
0x01//register data type is 16 signed binaries
0x21//register address high byte is preceding
0x12//register data low byte is preceding
0x21//CRC high byte is preceding
0x05//5 address table
0x1E//address table byte number
0x01 0x00 0x00 0x08 0x00 0x51//address table 1
0x02 0x20 0x00 0xA8 0x00 0x02//address table 2
0x03 0x30 0x00 0x2F 0x00 0x0C//address table 3
0x04 0x50 0x00 0x20 0x00 0xA4//address table 4
0x05 0x80 0x00 0x05 0x01 0x24//address table 5
0x9F//cumulative and verification
3, host computer receives self-description information message, after judging address, check code and cumulative and verification correctly, according to certainly
The function code of the byte sequence, address table and the support that provide in description information carries out calling slave computer data, according to register class
Type and byte sequence parsing data.
The present invention has been described by way of example and in terms of the preferred embodiments, but they be not for limiting the present invention, it is any to be familiar with this skill
Skill person can make various changes or retouch from working as, therefore protection scope of the present invention without departing from the spirit and scope of the invention
It should be subject to what claims hereof protection scope was defined.
Claims (2)
1. a kind of Modbus frame format self-described method, slave computer increases Modbus frame format self-description information, and host computer passes through
Instruction calling slave computer self-description information, goes calling data according to the self-description information of slave computer and parses data, realize communication
Matching and data parsing matching；It is characterized by:
It can self-described including register data type；Register address low byte can self-described before in preceding or high byte；It posts
Latch data low byte can self-described before in preceding or high byte；The function code that register, relay, intake read-write are supported
It can self-described；Register, relay, intake initial address definition can self-described；Register, relay, intake quantity can
Self-described；CRC check low byte can self-described before in preceding or high byte；
The calling self-description information frame that host computer issues includes: device address, function code, check code and cumulative and verification；
Upper computer and lower computer is based on Modbus protocol communication, and to interconnect process automatically as follows:
Host computer carries out calling self-description information according to process, and it is as follows that host computer sends message:
0x01 0x71 0x5A 0xCC // device address, function code, check code, cumulative and verification slave computer receive host computer report
Text, after judging address and cumulative and verification correctly, response message is as follows:
0x01 0x71 0x5A // device address, function code, check code
0x01 // register data type is 16 signed binaries
0x21 // register address high byte is preceding
0x12 // register data low byte is preceding
0x21 //CRC high byte is preceding
0x05 // 5 address table
0x1E // address table byte number
0x01 0x00 0x00 0x08 0x00 0x51 // address table 1
0x02 0x20 0x00 0xA8 0x00 0x02 // address table 2
0x03 0x30 0x00 0x2F0x00 0x0C // address table 3
0x04 0x50 0x00 0x20 0x00 0xA4 // address table 4
0x05 0x80 0x00 0x05 0x01 0x24 // address table 5
0x9F // cumulative and verification
Host computer receives self-description information message, after judging address, check code and cumulative and verification correctly, is believed according to self-described
The function code of the byte sequence, address table and the support that provide in breath carries out calling slave computer data, according to register type and word
Section sequence parsing data.
2. Modbus frame format self-described method according to claim 1, it is characterised in that: the register data type
Can self-described, selection: 16 signed binaries, 16 unsigned binary numbers, 4 binary-coded decimals, 32 have symbol binary system
Number, 32 unsigned binary numbers, 8 binary-coded decimals, 32 floating numbers, ASCII character character string；
The register address, register data and CRC check low byte preceding or high byte before can self-described, 0x12 table
Show low byte preceding, 0x21 indicates high byte preceding；
The function code that the register, relay, intake read-write are supported can self-described, pass through every representatives of 16 control words and prop up
Different function codes is held to select.
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| CN201611198341.XA CN106506307B (en) | 2016-12-22 | 2016-12-22 | A kind of Modbus frame format self-described method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112180881B (en) * | 2020-10-22 | 2021-05-18 | 华能青岛热电有限公司 | Thermal power generating unit main control DCS trans-regional data communication integration system |
| CN112822083B (en) * | 2021-01-25 | 2022-03-01 | 华电通用轻型燃机设备有限公司 | MODBUS application layer-oriented data verification method and system |
| CN113824626B (en) * | 2021-09-24 | 2023-12-22 | 广东科瑞德电气科技有限公司 | Communication management method for preventing information interaction loss |
| CN114598567A (en) * | 2022-03-03 | 2022-06-07 | 深圳市元征科技股份有限公司 | Communication method, apparatus and storage medium |
| CN115174306B (en) * | 2022-07-04 | 2023-07-25 | 北京广利核系统工程有限公司 | Modbus communication memory optimization method, communication method and related device |
| CN116489254B (en) * | 2023-06-21 | 2023-09-08 | 中储粮成都储藏研究院有限公司 | Method for debugging lower computer by using upper computer |
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| CN102478797A (en) * | 2010-11-22 | 2012-05-30 | 中国科学院空间科学与应用研究中心 | Monitoring system with configurable communication protocol |
| CN103545933A (en) * | 2013-11-11 | 2014-01-29 | 国家电网公司 | Instation I/O interface protocol of intelligent substation online monitoring system |
| CN104052631A (en) * | 2014-05-22 | 2014-09-17 | 中兴通讯股份有限公司 | Equipment information collecting method, device and system |
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