WO2013033889A1

WO2013033889A1 - Method for communicating with plc and upper computer

Info

Publication number: WO2013033889A1
Application number: PCT/CN2011/079364
Authority: WO
Inventors: 刘华浩; 殷岳元; 邓立波; 赵万峰; 车通
Original assignee: 长沙中联重工科技发展股份有限公司; 湖南中联重科专用车有限责任公司
Priority date: 2011-09-06
Filing date: 2011-09-06
Publication date: 2013-03-14

Abstract

Disclosed are a method for communicating with a PLC and an upper computer. The method includes: receiving a command of connecting a PLC; attempting to read PLC type identifier information inside the PLC using pre-stored communication protocols and/or communication parameters for various types of PLCs one by one, and after the reading is successful, determining the communication protocol and communication parameter of the PLC as the communication protocol and communication parameter employed when successfully reading the PLC type identifier; and communicating with the PLC using the determined communication protocol and communication parameter. The uniform encapsulation of the communication protocols and/or communication parameters of various types of PLCs can enable an upper computer to communication with most types of PLCs, improving the universality of the upper computer and the flexibility of PLC selection. In addition, the automatic identification of the communication protocols and/or communication parameters of various types of PLCs can remove the work of manually selecting a PLC type or communication parameter, improving communication efficiency.

Description

Method for communicating with PLC and upper computer

Technical field

The present invention relates to the field of communications, and in particular, to a method for communicating with a PLC and a host computer. Background technique

At present, the mixing station generally uses the upper computer to communicate with the PLC connected to the upper computer. For different types of PLC, different versions of the upper computer interface program need to be developed for the upper computer, so that the upper computer can perform with the different types of PLC. Communication to achieve data read and write.

The above communication methods have the following defects: (1) The versatility of the host computer is not high, and it can only communicate with the PLC of the common type. For a PLC of a very type, it is necessary to add a PLC for the very type of PLC in the host computer. Interface program, long development cycle, difficult to manage version; (2) This type of communication causes the control part of the mixing station to be inflexible during production and post-maintenance, and the production and maintenance costs increase. Summary of the invention

The object of the present invention is to provide a method for communicating with a PLC and a host computer. The method and the host computer have high versatility, which makes the selection of the PLC more flexible.

In order to achieve the above object, the present invention provides a host computer for communicating with a PLC, the host computer comprising: a receiving port for receiving a command for connecting the PLC; and a controller for receiving at the receiving port After the command, the pre-stored communication protocols and/or communication parameters for a plurality of PLC types are used one by one, and the PLC type identification information in the PLC is attempted to be read, and after the reading is successful, the PLC is determined. The communication protocol and the communication parameter are communication protocols and communication parameters used when successfully reading the PLC type identifier; and adopting the determined The communication protocol and communication parameters communicate with the PLC.

Accordingly, the present invention also provides a method for communicating with a PLC, the method comprising: receiving a command to connect to the PLC; using a pre-stored communication protocol and/or communication parameters for a plurality of PLC types one by one, attempting Reading the PLC type identification information in the PLC, and after the reading is successful, determining the communication protocol and the communication parameter of the PLC as the communication protocol and the communication parameter used when successfully reading the PLC type identifier; The determined communication protocol and communication parameters are communicated with the PLC.

Through the above technical solution, the communication protocol and/or communication parameters of various types of PLCs can be uniformly encapsulated, and then the PLC type identification information in the PLC is attempted to realize the automatic identification of the PLC type and the communication parameters. The unified package of communication protocols and/or communication parameters of various types of PLCs enables the host computer to meet the communication with most types of PLCs, improving the versatility of the host computer and the flexibility of PLC selection. In addition, the automatic identification of communication protocols and/or communication parameters of various types of PLCs also eliminates the need to manually select PLC types and communication parameters to improve communication efficiency.

Other features and advantages of the invention will be described in detail in the detailed description which follows. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are in the In the drawing:

1 is a schematic structural view of a host computer provided by the present invention;

2 is a flow chart of a method for communicating with a PLC provided by the present invention. Description of the reference numerals

10 Receive Port 20 Controller detailed description

The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are intended to be illustrative and not restrictive.

FIG. 1 is a schematic structural view of a host computer provided by the present invention. As shown in FIG. 1, the present invention provides a host computer for communicating with a PLC, the host computer comprising: a receiving port 10 for receiving a command for connecting the PLC; and a controller 20 for After receiving the command, the receiving port adopts a pre-stored communication protocol and/or communication parameters for a plurality of PLC types one by one, and attempts to read the PLC type identification information in the PLC, and after the reading is successful, determine The communication protocol and communication parameters of the PLC are communication protocols and communication parameters used when successfully reading the PLC type identifier; and communicating with the PLC by using the determined communication protocol and communication parameters.

In order to communicate with different types of PLCs, different communication protocols and communication parameters must be specified. For example, for OMRON network communication PLC and Siemens network communication PLC, TCT/IP communication protocol is required, and the IP address and port number must be specified. For the Omron serial communication PLC, the serial communication protocol is required, and the serial port number and baud rate are required. For the Siemens 5611 card communication, the MPI address needs to be specified.

The communication protocol may include a TCP/IP communication protocol and a serial communication protocol, etc., and the communication parameters may include one or more of the following: an IP address, a port number, a serial port number, a baud rate, and an MPI address. However, the present invention is not limited thereto, and communication protocols and communication parameters required for communication with any type of PLC are applicable thereto.

Preferably, the receiving port 10 may further receive a PLC type of the PLC; the controller 20 may further be configured to adopt the stored communication parameters one by one in a case of adopting a communication protocol corresponding to the received PLC type. Trying to read the PLC type identification information in the PLC, and after the reading is successful, determining that the communication protocol of the PLC is the communication protocol corresponding to the received PLC type, and the communication parameter of the PLC is successfully read. The pass adopted by the PLC type identification Letter parameters. Thereby, in the case that the PLC type is known, the communication protocol corresponding to the PLC type is used, and the communication parameters corresponding to the communication protocol are tried one by one, compared to each communication protocol and each corresponding one of them is tried one by one. The communication parameters can reduce the time required to determine the communication protocol and communication parameters, and improve the speed of establishing a connection between the host computer and the PLC.

Preferably, the receiving port 10 can also receive communication parameters of the PLC; the controller

20 can also be used to adopt the stored communication protocol one by one, attempt to read the PLC type identification information in the PLC, and determine the communication protocol of the PLC after the reading is successful, using the received communication parameters. In order to successfully read the communication protocol used in the PLC type identification, the communication parameter of the PLC is the received communication parameter. Thereby, in the case of knowing the communication parameters, the communication protocol corresponding to the communication parameter may be tried one by one, and the determination of the communication protocol and the communication may be reduced compared to each communication protocol and each communication parameter corresponding thereto are tried one by one. The time required for the parameter increases the speed at which the connection between the host computer and the PLC is established.

2 is a flow chart of a method for communicating with a PLC provided by the present invention. As shown in FIG. 2, correspondingly, the present invention provides a method for communicating with a PLC, the method comprising: receiving a command to connect to the PLC; adopting a pre-stored communication protocol for a plurality of PLC types one by one and / or communication parameters, try to read the PLC type identification information in the PLC, and after the reading is successful, determine the communication protocol and communication parameters of the PLC are the communication protocols used when successfully reading the PLC type identification and Communication parameters; and communicating with the PLC using the determined communication protocol and communication parameters.

The communication parameter may include one or more of the following: an IP address, a port number, a serial port number, a baud rate, and an MPI address.

The method may further include: receiving a PLC type of the PLC; the step of determining a communication protocol and/or a communication parameter of the PLC includes: in a case of adopting a communication protocol corresponding to the received PLC type, Using the stored communication parameters one by one, attempting to read the PLC type identification information in the PLC, and after the reading is successful, determining that the communication protocol of the PLC is the communication protocol corresponding to the received PLC type, the PLC Communication parameters for successful reading The communication parameters used in the description of the PLC type.

The method may further include: receiving a communication parameter of the PLC; the step of determining a communication protocol and/or a communication parameter of the PLC includes: using the stored communication parameter one by one, using the stored one by one a communication protocol, attempting to read the PLC type identification information in the PLC, and after the reading is successful, determining that the communication protocol of the PLC is a communication protocol used when successfully reading the PLC type identifier, the PLC The communication parameters are the received communication parameters.

The specific details and beneficial effects of the method for communicating with the PLC are the same as those of the upper computer that communicates with the PLC, and will not be described herein.

Compared with the prior art, the mixing station control system needs to develop different versions of the upper computer interface program for the upper computer each time, and the workload is quite large, the efficiency is low, and the failure rate is high. By adopting the solution of the invention, any replacement of different types of PLCs can be realized without changing the upper computer, and the working efficiency is greatly improved.

The specific application of the present invention is not limited to a mixing station, and any field in which such communication with a PLC is required may be employed.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments, and various simple modifications of the technical solutions of the present invention may be made within the scope of the technical idea of the present invention. These simple variations are within the scope of the invention.

In addition, it should be noted that each specific technical method described in the above specific embodiments is specifically described. In the case of no contradiction, it can be combined in any suitable way. In order to avoid unnecessary repetition, the present invention will not be further described in various possible combinations.

In addition, any combination of various embodiments of the invention may be made, as long as it does not deviate from the idea of the invention, and should also be regarded as the disclosure of the invention.

Claims

Rights request

1. A host computer for communicating with a PLC, wherein the host computer comprises: a receiving port (10) for receiving a command for connecting the PLC;

a controller (20), configured to: after the receiving port receives the command, try to read a PLC type identifier in the PLC by using a pre-stored communication protocol and/or communication parameter for multiple PLC types one by one Information, and after successful reading, determining the communication protocol and communication parameters of the PLC are communication protocols and communication parameters used when successfully reading the PLC type identifier; and adopting the determined communication protocol and communication parameters, and The PLC communicates.

2. The host computer according to claim 1, wherein the communication parameter comprises one or more of the following: an IP address, a port number, a serial port number, a baud rate, and an MPI address.

3. The host computer according to claim 1, wherein:

The receiving port (10) also receives a PLC type of the PLC;

The controller (20) is further configured to: when using the communication protocol corresponding to the received PLC type, use the stored communication parameters one by one, try to read the PLC type identification information in the PLC, and read After the success, the communication protocol of the PLC is determined to be a communication protocol corresponding to the received PLC type, and the communication parameter of the PLC is a communication parameter used when the PLC type identifier is successfully read.

4. The host computer according to claim 1, wherein:

The receiving port (10) also receives communication parameters of the PLC;

The controller (20) is further configured to use the stored communication protocol one by one to attempt to read the PLC type identification information in the PLC, and after the reading is successful, determine, by using the received communication parameters. The communication protocol of the PLC is when the PLC type identifier is successfully read. The communication protocol adopted, the communication parameter of the PLC is the received communication parameter.

5. A method for communicating with a PLC, the method comprising: receiving a command to connect to the PLC;

Using pre-stored communication protocols and/or communication parameters for a plurality of PLC types one by one, attempting to read PLC type identification information in the PLC, and after reading successfully, determining that the communication protocol and communication parameters of the PLC are Communication protocol and communication parameters used when successfully reading the PLC type identifier;

Communicating with the PLC using the determined communication protocol and communication parameters.

6. The method according to claim 5, wherein the communication parameter comprises one or more of the following: an IP address, a port number, a serial port number, a baud rate, and an MPI address.

7. The method of claim 5, further comprising: receiving a PLC type of the PLC;

The step of determining a communication protocol and/or a communication parameter of the PLC includes: using the stored communication parameters one by one in a case of adopting a communication protocol corresponding to the received PLC type, attempting to read the PLC The PLC type identifies information, and after the reading is successful, determines that the communication protocol of the PLC is a communication protocol corresponding to the received PLC type, and the communication parameter of the PLC is used when the PLC type identifier is successfully read. Communication parameters.

8. The method of claim 5, further comprising: receiving communication parameters of the PLC;

The step of determining a communication protocol and/or a communication parameter of the PLC includes: using the stored communication protocol one by one, attempting to read the PLC type identification information in the PLC, using the received communication parameters, And after the reading is successful, determining that the communication protocol of the PLC is The communication protocol used when the PLC type identifier is successfully read, and the communication parameter of the PLC is the received communication parameter.