CN116383110A - Modbus communication module and communication method - Google Patents
Modbus communication module and communication method Download PDFInfo
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- CN116383110A CN116383110A CN202211709975.2A CN202211709975A CN116383110A CN 116383110 A CN116383110 A CN 116383110A CN 202211709975 A CN202211709975 A CN 202211709975A CN 116383110 A CN116383110 A CN 116383110A
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- 238000004891 communication Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000012545 processing Methods 0.000 claims abstract description 30
- 230000006978 adaptation Effects 0.000 claims abstract description 28
- 238000002955 isolation Methods 0.000 claims abstract description 6
- 238000013524 data verification Methods 0.000 claims description 7
- 230000004044 response Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 230000009191 jumping Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
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Abstract
The invention discloses a Modbus communication module and a communication method, comprising a Modbus adaptation module which is respectively connected with a frequency converter and a PLC/upper computer; the Modbus adaptation module comprises a processing module, a keyboard, a primary side RS485 interface, a secondary side RS485 interface and a communication indicator lamp, wherein the keyboard is connected with the processing module; a signal isolation module connected with a PLC/upper computer is arranged on the secondary side RS485 interface; the invention completes two functions by a corresponding relation between the primary side address and the secondary side address, 1, the data of the secondary side address is analyzed, 2, the data is converted into the data corresponding to the primary side address, and then the data is written into a frequency converter; updating the data corresponding to the real-time update of the primary side to the secondary side; therefore, the interaction of data is achieved, and the addresses of the primary side and the secondary side can be changed according to the requirements of various occasions through the parameter setting function of the keyboard, so that the keyboard can adapt to various different occasions.
Description
Technical Field
The invention relates to the field of MODBUS communication of frequency converters, in particular to a Modbus communication module and a communication method, which are mainly used for realizing the update and replacement of equipment in the aspect of 485 bus processing of field equipment in industrial control industry without modifying an original bus system.
Background
MODBUS communication is a one-to-many communication mode, that is, only 1 host exists in a single network segment, so that multiple slaves can be allowed, but to realize communication between the master and the slave, the host must know the register address of the slave device.
For some variable-frequency terminal clients, the control system of a workshop and the field 485 bus equipment are only in a layer which can be used, the modification of the master station equipment in the system can not be realized, and when the equipment is damaged and needs to be replaced with new equipment, the difference of register addresses can cause the non-use.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a Modbus communication module and a communication method; the problem that equipment cannot be used due to the fact that the MODBUS register addresses of new equipment and old equipment are different is solved.
The Modbus communication module is realized by the following technical scheme: the device comprises a Modbus adaptation module which is respectively connected with a frequency converter and a PLC/upper computer; the Modbus adaptation module comprises a processing module, a keyboard, a primary side RS485 interface, a secondary side RS485 interface and a communication indicator lamp, wherein the keyboard is connected with the processing module; a signal isolation module connected with a PLC/upper computer is arranged on the secondary side RS485 interface;
the Modbus adaptation module is provided with a secondary side data processing module of the ModBUS adaptation module and a primary side data processing module of the ModBUS adaptation module; the MODBUS adaptation module secondary side data processing module is connected with a secondary side RS485 interface; the MODBUS adaptation module primary side data processing module is connected with a primary side RS485 interface.
The Modbus communication method is realized by the following technical scheme:
the secondary side data processing module of the MODBUS adaptation module specifically comprises the following steps:
s1, receiving PLC data, and entering S2;
s2, judging whether the equipment station number is correct, if so, entering S3, and if not, entering S13;
s3, modbus data verification, and entering S4;
s4, judging whether the verification is successful, if so, entering S5, and if not, entering S13;
s5, searching a secondary side matching address, and entering S6;
s6, judging whether the address exists, if so, entering S7, and if not, entering S13;
s7, judging Modbus command codes, and simultaneously carrying out S8, S9 and S10;
s8, a 0x03 command is sent to S11;
s9, 0x06 command, entering S14;
s10, 0x010 command; entering S11;
s11, judging whether the continuous operation is carried out, if the continuous operation is carried out in S8, entering S12, and if the continuous operation is carried out in S10, entering S14; s8 and S10 are discontinuous, and S13 is entered;
s12, acquiring secondary side address data, and entering S15;
s13, preparing fault response data, and entering S15;
s14, writing data into the address, setting an address writing event flag bit corresponding to the primary side;
s15, returning response data to the upper computer;
the MODBUS adaptation module primary side data processing module specifically comprises the following steps:
s1, whether a transmission busy bit is 1 or not, entering S2 if not, and entering S7 if not;
s2, writing the polling address into an event address bit, and entering S3;
s3, judging whether a writing event exists or not; writing is performed, S4 is performed, and writing is performed, S5 is performed;
s4, writing the data into a frequency converter, and entering S6;
s5, circularly reading the data of the frequency converter, and entering S6;
s6, the busy position is 1, and S7 is entered;
s7, judging whether data are received or not, if yes, entering S8, and if not, directly ending;
s8, judging whether the data is successfully checked, if so, entering S9, otherwise, directly ending
S9, judging whether a command is written or not, if so, entering S10, otherwise, entering S11;
s10, clearing a primary side write event log, and ending;
s11, updating address data of a primary register, and entering S12;
s12, updating the address data of the corresponding secondary side register, and ending.
The beneficial effects of the invention are as follows: through a corresponding relation to the addresses of the primary side and the secondary side, two functions are completed:
1. analyzing the data of the secondary side address, converting the data into data corresponding to the primary side address, and then writing the data into a frequency converter;
2. and updating the data corresponding to the real-time update of the primary side to the secondary side. Therefore, the interaction of data is achieved, and the address of the primary side and the secondary side can be changed according to the requirements of various occasions through the parameter setting function of the keyboard, so that the device can adapt to various different occasions, and the problem that the register addresses are not matched during equipment replacement is well solved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a Modbus communication module;
FIG. 2 is a schematic diagram illustrating the processing steps of a secondary side data processing module of the MODBUS adaptation module;
fig. 3 is a schematic diagram of a processing step of a primary side data processing module of the MODBUS adaptation module.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
As shown in fig. 1, the Modbus communication module of the present invention includes a Modbus adapting module respectively connected to a frequency converter and a PLC/host; the Modbus adaptation module comprises a processing module, a keyboard, a primary side RS485 interface, a secondary side RS485 interface and a communication indicator lamp, wherein the keyboard is connected with the processing module; a signal isolation module connected with a PLC/upper computer is arranged on the secondary side RS485 interface;
the Modbus adaptation module is provided with a secondary side data processing module of the ModBUS adaptation module and a primary side data processing module of the ModBUS adaptation module; the MODBUS adaptation module secondary side data processing module is connected with a secondary side RS485 interface; the MODBUS adaptation module primary side data processing module is connected with a primary side RS485 interface.
In this embodiment, the MODBUS adapting module has a function menu structure, and functional parameters of the module are set through the keyboard, including addresses corresponding to the primary side and the secondary side, decimal point numbers of the primary side and the secondary side data, communication formats and station addresses, and normal work can be performed after parameter setting is completed; the method mainly relates to communication format parameters, primary side address setting and secondary side address setting.
The Modbus communication method of the invention is as shown in FIG. 2: the flow is the flow of secondary side data processing, and the role of the secondary side is MODBUS slave station;
s1: the secondary side RS485 interface receives data from the PLC/upper computer;
s2: judging whether the received MODBUS station number is matched with the station number of the module, if not, jumping to the step S13;
s3: performing CRC16 check on the received data;
s4: judging whether CRC check is successful;
s5: after the data verification is successful, the address information in the data is acquired and is compared with all secondary side addresses;
s6: judging whether a matching address is found, if not, jumping to the step S13;
s7: if the matching address is found, judging the function command (0 x03,0x06,0x 10) of the data;
s8: if the function command is 0x03 (reading a plurality of data), jumping to step S11;
s9: if the function command is 0x06 (writing single data), jumping to the step S14;
s10: if the function command is 0x10 (writing a plurality of data), entering the next step;
s11: judging whether addresses in the plurality of addresses are continuously read/continuously written or not, if not, jumping to the step S13;
s12: acquiring data in a secondary side address, and preparing for data response;
s13: preparing fault response data, and jumping to the step S15;
s14: writing the received PLC data into the secondary side address, updating the data of the address corresponding to the primary side and writing in the event flag bit;
s15: returning the data to the PLC, and ending the flow;
as shown in fig. 3, the role of the primary side of the process corresponds to the role of the MODBUS master station for the frequency converter:
s1: judging whether the sent busy flag bit is 1, if so, jumping to a step S7;
s2: polling write event flag bits of all addresses of a primary side;
s3: judging whether a writing event exists, if not, jumping to the step S5;
s4: if a writing event exists, writing primary address data with the writing event into a frequency converter;
s5: if no writing event exists, circularly reading the data of the frequency converter to update the primary side address data and the corresponding secondary side address data;
s6: after the data transmission is completed, a busy flag position 1 is transmitted;
s7: judging whether data are received or not, if not, ending the program;
s8: if data is received, judging whether the data verification is successful, and if the data verification is failed, ending the program;
s9: if the data verification is successful, judging whether the data verification is a writing event or not;
s10: if the write event is the write event, the write event flag bit of the corresponding address of the primary side is cleared, and the program is ended;
s11: if the task is a cyclic reading task, updating the primary address data;
s12: updating corresponding secondary side address data;
the invention can be used for a communication device which is suitable for the register address of the MODBUS frequency converter of any manufacturer, and is mainly used for occasions where certain PLC or upper computer programs cannot be changed when certain new frequency converters are replaced by old ones. By the device, new equipment supporting MODBUS communication can be conveniently accessed to the communication bus, the original register address in the PLC or the upper computer does not need to be modified, and the device is provided with an isolation signal isolation circuit to enhance the anti-interference capability of the equipment.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any changes or substitutions that do not undergo the inventive effort should be construed as falling within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope defined by the claims.
Claims (2)
1. The utility model provides a Modbus communication module which characterized in that: the device comprises a Modbus adaptation module which is respectively connected with a frequency converter and a PLC/upper computer; the Modbus adaptation module comprises a processing module, a keyboard, a primary side RS485 interface, a secondary side RS485 interface and a communication indicator lamp, wherein the keyboard is connected with the processing module; a signal isolation module connected with a PLC/upper computer is arranged on the secondary side RS485 interface;
the Modbus adaptation module is provided with a secondary side data processing module of the ModBUS adaptation module and a primary side data processing module of the ModBUS adaptation module; the MODBUS adaptation module secondary side data processing module is connected with a secondary side RS485 interface; the MODBUS adaptation module primary side data processing module is connected with a primary side RS485 interface.
2. A Modbus communication module communication method is characterized in that: the secondary side data processing module of the MODBUS adaptation module specifically comprises the following steps:
s1, receiving PLC data, and entering S2;
s2, judging whether the equipment station number is correct, if so, entering S3, and if not, entering S13;
s3, modbus data verification, and entering S4;
s4, judging whether the verification is successful, if so, entering S5, and if not, entering S13;
s5, searching a secondary side matching address, and entering S6;
s6, judging whether the address exists, if so, entering S7, and if not, entering S13;
s7, judging Modbus command codes, and simultaneously carrying out S8, S9 and S10;
s8, 0x03 command (read multiple), and the process goes to S11;
s9, 0x06 command (write single), enter S14;
s10, 0x010 command (read multiple); entering S11;
s11, judging whether the continuous operation is carried out, if the continuous operation is carried out in S8, entering S12, and if the continuous operation is carried out in S10, entering S14; s8 and S10 are discontinuous, and S13 is entered;
s12, acquiring secondary side address data, and entering S15;
s13, preparing fault response data, and entering S15;
s14, writing data into the address, setting an address writing event flag bit corresponding to the primary side;
s15, returning response data to the upper computer;
the MODBUS adaptation module primary side data processing module specifically comprises the following steps:
s1, whether a transmission busy bit is 1 or not, entering S2 if not, and entering S7 if not;
s2, writing the polling address into an event address bit, and entering S3;
s3, judging whether a writing event exists or not; writing is performed, S4 is performed, and writing is performed, S5 is performed;
s4, writing the data into a frequency converter, and entering S6;
s5, circularly reading the data of the frequency converter, and entering S6;
s6, the busy position is 1, and S7 is entered;
s7, judging whether data are received or not, if yes, entering S8, and if not, directly ending;
s8, judging whether the data is successfully checked, if so, entering S9, otherwise, directly ending S9, judging whether to write in a command, if so, entering S10, otherwise, entering S11;
s10, clearing a primary side write event log, and ending;
s11, updating address data of a primary register, and entering S12;
s12, updating the address data of the corresponding secondary side register, and ending.
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