CN103576598A - Programmable logic control system based on wireless expansion bus mode and control method - Google Patents
Programmable logic control system based on wireless expansion bus mode and control method Download PDFInfo
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Abstract
The invention provides a programmable logic control system based on a wireless expansion bus mode. The programmable logic control system comprises a programmable logic controller and multiple expansion modules, wherein the programmable logic controller is connected with the multiple expansion modules based on the wireless expansion bus mode. The programmable logic control system creates a wireless expansion bus for the PLC to simplify the installation of a PLC system, and is more flexible in terms of the arrangement of the PLC and the expansion modules (with no need for quite close installation).
Description
Technical field
The present invention relates to a kind of PLC control system and control method and control device, more particularly, relate to a kind of PLC control system and control method and control device based on wireless extensions bus mode.
Background technology
At current PLC(Programmable logic Controller, programmable logic controller (PLC)) design in, all expansions all must carry out wired connection by expansion bus; But this solution has very strict restriction for installing and revising.
First, due to the restriction of length of cable, all PLC CPU and expansion module must assemble with very dense and required order.But for some client, the installing space of PLC is very limited, or opertaing device is installed in separated space.Therefore, for some client, the installation of PCL system is very complicated.
Secondly, if customer need is revised expansion structure, after installing, be difficult to remove and add expansion.
Therefore, the present invention proposes a kind of method that designs PLC expansion bus based on wireless technology, to break, restriction is installed, and the dirigibility that changes system architecture is provided to client.
Fig. 1 shows the PLC control system expansion syndeton block diagram according to prior art.
As shown in Figure 1, in existing PLC, all expansion module 102-104 connect by wired expansion bus, and this design must be placed PLC CPU101 and expansion 102-104 in very dense ground.In Fig. 1, all PLC CPU101 and expansion module 102-104 pass through expansion bus wired connection, and must assemble with very dense and required order, can not be arranged on separated space.
In existing PLC system, expansion bus connects based on cable, solution technology can be based on UART(Universal Asynchronous Receiver/Transmitter, Universal Asynchronous Receiver & dispensing device), SPI (Serial Peripheral Interface, Serial Peripheral Interface (SPI)) or USB etc.Expansion module is connected in series, and expansion module connects and addressing based on cable.
Summary of the invention
Additional aspects of the present invention and advantage part will be set forth in the description below, also have part from describe, to find out significantly, or can in practice of the present invention, obtain.
In existing PLC design, all types of PLC expansion bus are all to connect based on wired or cable, and due to wired and restriction connector, the installation of PLC CPU and expansion must be very tight, therefore by the placement of PLC CPU and expansion module, the space of system wiring and installation is very limited.
The present invention has designed a kind of new PLC expansion bus based on wireless method, the benefit that is easy to installation, connects up and configure as client provides while take convenient system made.
The invention provides a kind of programmable logic control system based on wireless extensions bus mode, comprise: programmable logic controller (PLC) and a plurality of expansion module, wherein, between described programmable logic controller (PLC) and a plurality of expansion modules, by the mode based on wireless extensions bus, be connected.
The present invention also provides a kind of control method of the programmable logic control system based on wireless extensions bus mode, described programmable logic control system comprises programmable logic controller (PLC) and a plurality of expansion module, described method comprises: a) wireless communication protocol to be scheduled to, set up being connected between described programmable logic controller (PLC) and a plurality of expansion modules; B) configure a plurality of expansion modules by programmable logic controller (PLC) controlled in wireless, and by utilizing the identification identifier of a plurality of expansion modules to verify a plurality of expansion modules; C) operational system application program circulation; D) check being connected and communications status between programmable logic controller (PLC) and a plurality of expansion modules; And e) utilize the communication data between predictive error detection algorithm verification programmable logic controller (PLC) and a plurality of expansion module, if data correctly, are returned to step c).
The present invention also provides a kind of control device of the programmable logic control system based on wireless extensions bus mode, described programmable logic control system comprises programmable logic controller (PLC) and a plurality of expansion module, described device comprises: link block, for wireless communication protocol to be scheduled to, set up being connected between described programmable logic controller (PLC) and a plurality of expansion modules; Configuration and identification module, for after described link block successful connection, configure a plurality of expansion modules by programmable logic controller (PLC) controlled in wireless, and by utilizing the identification identifier of a plurality of expansion modules to verify a plurality of expansion modules; Operation module, for after described configuration and identification module configuration and identifying a plurality of control modules, the circulation of operational system application program; Checking module, for after the circulation of described operation module operational system application program, checks being connected and communications status between programmable logic controller (PLC) and a plurality of expansion modules; And correction verification module, for after checking module is determined the successful connection between connection controller able to programme and a plurality of control module, utilize the communication data between predictive error detection algorithm verification programmable logic controller (PLC) and a plurality of expansion module, if data correctly, again move described operation module.
For the expansion bus solution of wireless PLC control system, PLC base station and expansion module can replace and be adjacent to install and install separatedly.Distance between PLC base station and PLC expansion can quite far and be installed and configure all very flexible.
Accompanying drawing explanation
In conjunction with the drawings the preferred embodiments of the present invention are described in detail, above and other object of the present invention, characteristic and advantage will become apparent, and wherein identical label is specified the unit of same structure, and therein:
Fig. 1 shows the PLC control system expansion syndeton block diagram according to prior art.
Fig. 2 shows according to the structure of the PLC control system based on wireless extensions bus mode of the embodiment of the present invention.
Fig. 3 shows the detailed circuit block diagram being connected with an expansion module 302 according to the PLC base station 301 of the embodiment of the present invention.And
Fig. 4 shows the workflow diagram of the PLC control system in Fig. 3.
Embodiment
Below with reference to the accompanying drawing that the embodiment of the present invention is shown, the present invention is fully described.Yet the present invention can realize in many different forms, and not will be understood that and be limited to embodiment described here.On the contrary, provide these embodiment to make the disclosure thorough and complete, and will give full expression to scope of the present invention to those skilled in the art.
Unless otherwise defined, all terms used herein (comprising technology and scientific terminology) have the common identical meanings of understanding with those skilled in the art.It should also be understood that, such as those terms that define, should be interpreted as having the implication consistent with implication in they contexts in correlation technique in common dictionary, and do not apply idealized or extremely formal meaning explain, unless definition so clearly here.
Here with reference to supporting according to the block scheme of the method for the embodiment of the present invention, device (system) and computer program and flow chart description exemplary embodiment of the present.Should be appreciated that each square frame of process flow diagram and/or block scheme and the combinations of blocks of process flow diagram and/or block scheme can realize by computer program instructions.The processor that these computer program instructions can offer multi-purpose computer, special purpose computer or other programmable data treating apparatus to be to produce machine, and the instruction that makes to carry out by the processor of computing machine or other programmable data treating apparatus creates the means of appointed function/action in realization flow figure and/or block scheme square frame.
These computer program instructions also can be stored in computer-readable memory, can vectoring computer or other programmable data treating apparatus with ad hoc fashion, move, the instruction that makes to be stored in computer-readable memory produces the manufacture article that comprise the instruction means that realize appointed function/action in block scheme square frame.
Computer program instructions can also be loaded on computing machine or other programmable data treating apparatus, cause carrying out sequence of operations step on computing machine or other programmable devices and produce computer implemented processing, make the instruction of carrying out on computing machine or other programmable devices that the step that realizes appointed function/action in block scheme square frame is provided.Each square frame can represent code module, segment or part, and it comprises one or more executable instructions that are used for realizing specified.Shall also be noted that the function marking in square frame may be not according to occurring in sequence of marking in figure in other are realized.For example, according to related function, two square frames that illustrate continuously may be carried out in fact substantially concomitantly, or square frame may be carried out sometimes in reverse order.
For solution of the present invention, by wireless solution, replace expansion bus, so that the communication of expansion can be based on wireless protocols.
In this explanation, the content of example is provided to help complete understanding with reference to the disclosed various exemplary embodiments of the present invention of accompanying drawing.Therefore, those of skill in the art recognize that in the situation that do not depart from claimed the spirit and scope of the present invention, can make various changes and modifications exemplary embodiment described herein.For clarity and brevity, by the description of omitting known function and structure.
According to the present invention, adopted the wireless PLC expansion bus with ID configuration and error detecting algorithm.
Fig. 2 shows according to the structure of the PLC control system based on wireless extensions bus mode of the embodiment of the present invention.
As shown in Figure 2, according to the present invention program, the PLC control system based on wireless extensions bus comprises PLC base station 201 and a plurality of expansion 202-205.Although only show 4 expansions in Fig. 2, it should be appreciated by those skilled in the art that the quantity that can increase as required expansion.
In order to realize the scheme shown in Fig. 2, in PLC base station 201 and PLC expansion module 202-205, designed respectively the circuit for radio communication, wireless solution can be bluetooth, Wifi, Zigbee etc.
In addition, a kind of application protocol is added to the wireless communication protocol for radio communication between PLC base station 201 and expansion module 202-205, to avoid error communications and to guarantee the reliable of communication.Meanwhile, error detecting algorithm be used to avoid communication error, verification and etc.
For PLC 201 and expansion module 202-205, this is configured to guarantee the communication of each system to embed a kind of configurable identity circuit.This identity scheme can be the configurable sequence number in a switch or storer.
Fig. 3 shows the detailed circuit block diagram being connected with an expansion module 302 according to the PLC base station 301 of the embodiment of the present invention.
Although only take an expansion module 302 in Fig. 3 as example is illustrated, it should be appreciated by those skilled in the art that in PLC control system and can comprise a plurality of expansion modules, and each expansion module have the circuit of expansion module shown in Fig. 3 302.
According to the present invention, by by the interface circuit that comprises wireless transceiver 3012 and antenna 3013 and comprise wireless transceiver 3022 and the interface circuit of antenna 3023 is applied as the wireless extensions bus of a kind of PLC, realize the hardware capability of wireless PLC expansion, the mode by software protocol, ID identification realizes the reliable control to wireless extensions 302 simultaneously.
Microprocessor 3011(or, the CPU part in PLC system) be responsible for the application program of operation PLC and configure different expansion modules and IO function.Wireless transceiver 3012 and wireless transceiver 3012 have been realized interface and the data link layer functions that the wireless extensions of microprocessor is communicated by letter.
Antenna 3023 has been realized interface and the data link layer functions that the wireless extensions of expansion module 302 is communicated by letter with wireless transceiver 3022, expansion microprocessor 3021(or, the CPU of expansion module 302) be that in PLC system, master microprocessor 3011 is controlled from microprocessor.
As shown in Figure 3, wireless transceiver 3012 communicates via antenna 3013 and 3023 with wireless transceiver 3022.
In all expansion modules, design ID configuration logic, to guarantee that in configuration and communication period each expansion module has a unique identity.
For PLC base station 301 and expansion module 302 configuration features and the ID that communicates by letter, for expansion module 302, give unique address, and carry out link between PLC base station 301 and expansion module 302.As shown in Figure 3, microprocessor 3011 and expansion microprocessor 3021 have comprised ID(identity) module 30111 and 30211.Herein, according to actual needs, the identity module in microprocessor 3011 is optional.
ID module 30111 is used to PLC base station 3011 to distribute a unique identification identifier; And ID module 30211 is used to expansion module 302 to distribute a unique identification identifier, to distinguish different expansion modules, to reach the accurate control to each function of expansion module.This ID module 30111 and 30211 implementation method have a lot, can configure or hardware configuration mode by software.
Software configuration mode: such as by programming to different expansion modules, configuration ID number, or configuration after communication is set up in IP address.
The mode of hardware configuration: can pass through the mode of toggle switch (later stage collocation method) or MAC Address identification, or product ID.
Microprocessor 3011 is by utilizing identification identifier to verify expansion module 302.
Microprocessor 3011 utilizes wireless transceiver 3012 to communicate by letter with expansion module 302 by antenna 3013.
For fear of between PLC 301 and expansion module 302 communicate by letter and other radio communications between phase mutual interference, based on wireless communication protocol, create new application protocol so that PLC 301 utilizes a kind of new wireless communication mechanism to communicate by letter with expansion module 302.Verification and or other error detection methods be integrated in wireless communication protocol.
Microprocessor 3011 is for carrying out the system application circulation of PLC control system.By the CPU that is responsible for wireless connections, i.e. microprocessor in Fig. 3 3011, carrys out send and receive data by wireless transceiver 3012 with antenna 3013 to control and the communicating by letter of expansion module 302, that is, and and being connected and configuring expansion module of foundation and expansion module 302.Microprocessor 3011 checks radio communication connection state and communication conditions between PLC base station 301 and expansion module 302 at the cycle period (that is, completing the cycle of primary system application program circulation) of each PLC.If connect and to break, and alarm, to guarantee the reliability of PLC system works.
Based on wireless communication protocol design error detection algorithm.Error-tested algorithm can be realized by existing algorithm, such as the agreement checking algorithm of network service, also can realize by self-defining algorithm.
Error-tested is realized by the take over party of data, because according to the existing input of wireless extensions module of the present invention, also have output, so data are transmitted in both directions.Therefore, checking algorithm can be completed by the module of communicating pair simultaneously.
When user utilizes according to the PLC control system based on wireless extensions bus mode of the present invention, in the user application of user in downloading to microprocessor 3011, configure all expansion modules that need to be controlled by PLC CPU.In CPU module 3011, download PLC application program, based on this application program, PLC CPU can control all expansion IO by PLC radio communication.
The application program of PLC and configuration information are that the programming port by PLC 301 downloads in microprocessor 3011, and like this, as main control PLC, microprocessor 3011 just can be identified need to be by the information of the wireless extensions module 302 of its control.Simultaneously system start or operational process in, the job information of the wireless PLC expansion module in scanning and monitor network.
User sets up according to PLC system of the present invention wiring.Energising, PLC base station 201 runs user applications all movements based on user application control CPU and all expansion module 202-203.
Fig. 4 shows the workflow diagram of the PLC control system in Fig. 3.Although take an expansion module in Fig. 4 as example is illustrated, the process flow diagram that those skilled in the art should understand that Fig. 4 is also applicable to the situation of a plurality of expansion modules.
As shown in Figure 4, in step 401, the energising of PLC control system.
In step 4011 and 4021, PLC base station 301 and expansion module 302 resets.
In step 4012, microprocessor 3011 operations are with Load System; In step 4022,3021 operations of expansion microprocessor are with loading firmware.
In step 4013 and 4023, the firmware of initialization PLC base station 301 and expansion module 302.
In PLC base station 301 1 sides, in step 4014, microprocessor 3011 calling system application programs.Now, if this system application does not comprise expansion module, the system application circulation 404 of microprocessor 3011 operation PLC self so.If this system application comprises expansion module, enter step 4015.In step 4015, carry out and being connected of expansion module.If connect unsuccessfully, enter that step 4016 is waited for and retry.If still unsuccessful after carrying out connecting for N time, proceed to step 402, PLC base station 301 provides false alarm.Herein, N is more than or equal to 3 natural number.It should be appreciated by those skilled in the art that N can be set according to the actual requirements.If successful connection, proceeds to step 4017.
In expansion module one side, in step 4024, expansion module waits for that PLC base station 302 connects.If connect unsuccessfully, return to step 4024 and continue to wait for.If successful connection, proceeds to step 4017.
In step 4017, microprocessor 3011 connects setting and ID configuration, to identify the expansion module in PLC control system.
In step 4018, the configuration of microprocessor 3011 initialization expansion modules 302.
In step 4019, microprocessor 3011 operational system application program circulations.PLC control system often completes a required time of cycling and is called a scan period.
In step 4020, in each circulation, microprocessor 3011 checks connection status and communications status.If connect unsuccessfully, enter step 402 and 403, expansion module 302 is out of service, and PLC base station 301 provides false alarm, and expansion module 302 is lighted wrong LED(light emitting diode).
If successful connection, in step 4021, microprocessor 3011 utilizes error detecting algorithm verification communication data, if data are correct, turn back to step 4019, continue the circulation of operational system application program, and continue to check connection status and communications status in the scan period of each PLC.
If data are incorrect, enter step 4022, communicate data re-transmission, and checking data.If through N re-transmission verification, still error in data, enters step 402 and 403, expansion module 302 is out of service, and PLC base station 301 provides false alarm, and expansion module 302 is lighted wrong LED(light emitting diode).If retransmitted in checking procedure at N time, data are correct, turn back to step 4019.Here, N is more than or equal to 3 natural number.It should be appreciated by those skilled in the art that N can be set according to the actual requirements.
Fig. 4 has provided the workflow between an expansion module and PLC base station.For the situation of a plurality of expansion modules, similar with above-mentioned flow process.Difference is: if there are a plurality of expansion modules, and only have the failure of part expanding communication, should continue communicating by letter of maintenance and other expansions, expand and the same alarm in PLC base station 301, and the expansion module of communication failure quits work simultaneously.
In addition, figure 4 illustrates two kinds of different type of alarms of PLC base station and expansion module, but it should be appreciated by those skilled in the art that they can adopt identical type of alarm, also can adopt the type of alarm of unlisted other herein.
System tool according to the present invention has the following advantages and range of application.
1. the present invention is the scope of a kind of new PLC, has more client, and share in more market, and be the new application scenarios of product.
2. the present invention is easier for system made and wiring, and has better customer satisfaction.
3. the invention enables debugging and the modification of system made to become more easy, because all expansion modules are set up discretely, between CPU and each expansion, there is no the wired connection of entity.
4. the present invention has also saved system power supply, has reduced the power consumption of PLC control system.
Although described the present invention in conjunction with being considered at present most realistic and optimum embodiment, but those skilled in the art are to be understood that and the invention is not restricted to the disclosed embodiments, on the contrary, the present invention is intended to cover various modifications and the equivalent construction comprising within the spirit of claims and category.
Claims (25)
1. the programmable logic control system based on wireless extensions bus mode, comprise: programmable logic controller (PLC) and a plurality of expansion module, wherein, between described programmable logic controller (PLC) and a plurality of expansion modules, by the mode based on wireless extensions bus, be connected.
2. programmable logic control system as claimed in claim 1, wherein,
Described programmable logic controller (PLC) comprises:
Microprocessor, for carrying out the system application circulation of programmable logic control system, and the communicating by letter of control and a plurality of expansion modules;
The first wireless transceiver, for via the first antenna with the wireless communication protocol send and receive be scheduled to the data from a plurality of expansion modules; With
The first antenna;
Each of described expansion module comprises:
Expansion microprocessor, for controlling and the communicating by letter of programmable logic controller (PLC);
The second wireless transceiver, for via the second antenna with the wireless communication protocol send and receive be scheduled to the data from programmable logic controller (PLC); With
The second antenna.
3. programmable logic control system as claimed in claim 2, wherein, described expansion microprocessor comprises identity module, is used to expansion module to distribute a unique identification identifier.
4. programmable logic control system as claimed in claim 3, wherein, described microprocessor comprises identity module, is used to programmable logic controller (PLC) to distribute a unique identification identifier.
5. programmable logic control system as claimed in claim 4, wherein, described identification identifier comprises one or more in identification number, IP address, MAC Address, product ID.
6. programmable logic control system as claimed in claim 5, wherein, described microprocessor foundation is connected with a plurality of expansion modules, configures a plurality of expansion modules by programmable logic controller (PLC) controls, and by utilizing the identification identifier of a plurality of expansion modules to verify a plurality of expansion modules.
7. programmable logic control system as claimed in claim 6, wherein, when with a plurality of expansion modules in one or more connection failure N time time, described microprocessor sends false alarm, N is more than or equal to 3 natural number.
8. programmable logic control system as claimed in claim 7, wherein, described microprocessor is connected and communications status each system application circular test and a plurality of expansion modules.
9. programmable logic control system as claimed in claim 8, wherein, the data that described microprocessor utilizes the verification of certain errors check algorithm to receive via the first wireless transceiver.
10. programmable logic control system as claimed in claim 8, wherein, when the check failure of data N time, described microprocessor sends false alarm, and the expansion microprocessor of verification failure also sends false alarm out of service, and N is more than or equal to 3 natural number.
11. programmable logic control systems as claimed in claim 10, wherein, described predetermined wireless communication protocol can carry out based on bluetooth, Wifi, Zigbee.
The control method of 12. 1 kinds of programmable logic control systems based on wireless extensions bus mode, described programmable logic control system comprises programmable logic controller (PLC) and a plurality of expansion module, described method comprises:
A) wireless communication protocol to be scheduled to, sets up being connected between described programmable logic controller (PLC) and a plurality of expansion modules;
B) configure a plurality of expansion modules by programmable logic controller (PLC) controlled in wireless, and by utilizing the identification identifier of a plurality of expansion modules to verify a plurality of expansion modules;
C) operational system application program circulation;
D) check being connected and communications status between programmable logic controller (PLC) and a plurality of expansion modules; With
E) utilize the communication data between predictive error detection algorithm verification programmable logic controller (PLC) and a plurality of expansion module, if data correctly, are returned to step c).
13. control methods as claimed in claim 12, described step a) further comprises: when and a plurality of expansion module in one or more expansion modules between connection failure N time time, send false alarm, N is more than or equal to 3 natural number.
14. control methods as claimed in claim 13, described steps d) further comprise: during connection failure between the one or more expansion modules in programmable logic controller (PLC) and a plurality of expansion module, described programmable logic controller (PLC) sends false alarm, and one or more expansion modules of connection failure send false alarm out of service, N is more than or equal to 3 natural number.
15. control methods as claimed in claim 14, described step e) further comprise:, if data are incorrect, retransmit communication data and utilize the further verification of predetermined detection algorithm, if data correctly, are returned to step c).
16. control methods as claimed in claim 15, described step e) further comprise: if it is still incorrect to retransmit communication data N secondary data, described programmable logic controller (PLC) sends false alarm, and the incorrect one or more expansion modules of communication data send false alarm out of service, N is more than or equal to 3 natural number.
17. control methods as claimed in claim 16, wherein, described identification identifier comprises one or more in identification number, IP address, MAC Address, product ID.
18. control methods as claimed in claim 17, wherein, described predetermined wireless communication protocol can carry out based on bluetooth, Wifi, Zigbee.
The control device of 19. 1 kinds of programmable logic control systems based on wireless extensions bus mode, described programmable logic control system comprises programmable logic controller (PLC) and a plurality of expansion module, described device comprises:
Link block, for the wireless communication protocol to be scheduled to, sets up being connected between described programmable logic controller (PLC) and a plurality of expansion modules;
Configuration and identification module, for after described link block successful connection, configure a plurality of expansion modules by programmable logic controller (PLC) controlled in wireless, and by utilizing the identification identifier of a plurality of expansion modules to verify a plurality of expansion modules;
Operation module, for after described configuration and identification module configuration and identifying a plurality of control modules, the circulation of operational system application program;
Checking module, for after the circulation of described operation module operational system application program, checks being connected and communications status between programmable logic controller (PLC) and a plurality of expansion modules; With
Correction verification module, for after checking module is determined the successful connection between connection controller able to programme and a plurality of control module, utilize the communication data between predictive error detection algorithm verification programmable logic controller (PLC) and a plurality of expansion module, if data correctly, again move described operation module.
20. control device as claimed in claim 19, wherein, described link block be further used for when and a plurality of expansion module in one or more expansion modules between connection failure N time time, send false alarm, N is more than or equal to 3 natural number.
21. control device as claimed in claim 20, wherein, when described checking module is further used for the connection failure between the one or more expansion modules in programmable logic controller (PLC) and a plurality of expansion module, send false alarm, and one or more expansion modules of connection failure out of service, N is more than or equal to 3 natural number.
22. control device as claimed in claim 21, wherein, described correction verification module is further used for when data are incorrect, retransmits communication data and utilizes the further verification of predetermined detection algorithm, if data correctly, again moves described operation module.
23. control device as claimed in claim 22, wherein, if it is still incorrect that described correction verification module is further used for retransmitting communication data N secondary data, send false alarm, and the incorrect one or more expansion modules of communication data in a plurality of expansion module out of service, N is more than or equal to 3 natural number.
24. control device as claimed in claim 23, wherein, described identification identifier comprises one or more in identification number, IP address, MAC Address, product ID.
25. control device as claimed in claim 24, wherein, described predetermined wireless communication protocol can carry out based on bluetooth, Wifi, Zigbee.
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