CN111708313B - PLC system capable of realizing efficient transmission and data transmission method thereof - Google Patents

PLC system capable of realizing efficient transmission and data transmission method thereof Download PDF

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Publication number
CN111708313B
CN111708313B CN202010352368.XA CN202010352368A CN111708313B CN 111708313 B CN111708313 B CN 111708313B CN 202010352368 A CN202010352368 A CN 202010352368A CN 111708313 B CN111708313 B CN 111708313B
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bus
module
transmission
message
occupied
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CN111708313A (en
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李�浩
崔世飞
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Beijing Jiyuan Automation Technology Co ltd
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Beijing Jiyuan Automation Technology Co ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/054—Input/output
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/10—Plc systems
    • G05B2219/11—Plc I-O input output
    • G05B2219/1103—Special, intelligent I-O processor, also plc can only access via processor

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Programmable Controllers (AREA)

Abstract

The invention provides a PLC system capable of realizing high-efficiency transmission and a data transmission method thereof, wherein the PLC system capable of realizing high-efficiency transmission is provided with a first bus (11) and a second bus (12). The PLC system comprises a controller module (10) and a transmission IO module (13) which are respectively configured on a first bus (11) and a second bus (12). The first bus (11) is capable of transmitting data messages. The second bus (12) is capable of acquiring the occupancy message. The controller module (10) and the transmission IO module (13) can send out an occupation message. The first bus (11) is a single master polling mode bus. The second bus (12) is a multi-master contention access mode bus. The invention utilizes the advantages of different buses in the heterogeneous bus and effectively improves the performance and the reliability of the bus.

Description

PLC system capable of realizing efficient transmission and data transmission method thereof
Technical Field
The invention relates to bus transmission in a PLC system. The invention particularly relates to a PLC system capable of realizing high-efficiency transmission and a data transmission method thereof.
Background
In the PLC field bus control system, the field bus functions to connect the controller and each input/output module. The performance and reliability of the field bus directly determine the performance and reliability of the whole PLC control system. Most of the existing technical solutions adopt a transmission medium to implement bus transmission, i.e. a single-master polling mode or a multi-master contention access mode. In the single-master polling mode, a question-answer mode is adopted between the master control module and the input/output module, and the input/output module cannot actively send data and must wait for the master control module to inquire the master control module to answer. This approach is inefficient, especially if the data is not constant over a long period of time. In the multi-master contention access mode, any one module can initiate communication when needed, but the data packet cannot be very large because the limiting rate of the arbitration mechanism cannot be too high. Therefore, the method has the problems of low speed and short message, and is low in efficiency particularly when large data volume is dealt with.
Disclosure of Invention
The invention aims to provide a data transmission method capable of realizing high-efficiency transmission of a PLC system, which utilizes the advantages of different buses in heterogeneous buses and effectively improves the performance and reliability of the buses.
Another object of the present invention is to provide a PLC system capable of realizing efficient transmission, which utilizes the advantages of different buses in heterogeneous buses and effectively improves the performance and reliability of the buses.
The invention provides a data transmission method capable of realizing high-efficiency transmission of a PLC system. The PLC system has a first bus and a second bus. The PLC system comprises a controller module and a transmission IO module which are respectively configured on a first bus and a second bus. The first bus is capable of transmitting data messages. The second bus is capable of acquiring the occupancy message. The controller module and the transmission IO module can send out an occupation message. The first bus is a single master polling mode bus. The second bus is a multi-master contention access mode bus.
The data transmission method capable of realizing the high-efficiency transmission of the PLC system comprises the following steps:
step S101, if the controller module and the transmission IO module respectively receive the I/O transmission data, the controller module and the transmission IO module respectively send the occupation message of the controller and the occupation message of the transmission IO module to the second bus. The occupation message of the controller comprises the weight information of the controller module. The occupation message of the transmission IO module comprises the weight information of the transmission IO module.
And step S102, the second bus determines the current occupied module from the controller module and the transmission IO module and returns data sending information to the current occupied module according to the weight information in the controller occupied message and the transmission IO module occupied message.
And step S103, the current occupied module sends I/O transmission data through the first bus according to the data sending information.
In another exemplary embodiment of the bus transmission method, after step S103, the method further includes:
and step S104, after the current occupied module finishes I/O data transmission through the first bus, the current occupied module sends release information to the second bus.
In step S105, the second bus clears the occupied state according to the received release information and returns to step S101.
In another exemplary embodiment of the data transmission method, the occupied packet includes a start transmission instruction packet and an end transmission instruction packet.
In another exemplary embodiment of the data transmission method, step S102 includes:
and the second bus determines the current occupied module from the controller module and the transmission IO module and returns data sending information to the current occupied module according to the starting transmission instruction message in the controller occupied message and the weight information in the transmission IO module occupied message.
In another exemplary embodiment of the data transmission method, step S104 includes:
and after the current occupation module finishes I/O data transmission through the first bus, the current occupation module sends a transmission finishing instruction message in the occupation message to the second bus. And ending the transmission of the instruction message to be release information.
In another exemplary embodiment of the data transmission method, the transmission IO module in the PLC system may be configured in a plurality.
In another exemplary embodiment of the data transmission method, the first bus is an RS485 bus. The second bus is a can bus.
The invention also provides a PLC system capable of realizing high-efficiency transmission, which is provided with a first bus and a second bus. The PLC system comprises a controller module and a transmission IO module which are respectively configured on a first bus and a second bus. The first bus is capable of transmitting data messages. The second bus is capable of acquiring the occupancy message. The controller module and the transmission IO module can send out an occupation message. The first bus is a single master polling mode bus. The second bus is a multi-master contention access mode bus.
If the controller module and the transmission IO module receive the I/O transmission data, the controller module and the transmission IO module are configured to send the occupation packet of the controller and the occupation packet of the transmission IO module to the second bus, respectively. The occupation message of the controller comprises the weight information of the controller module. The occupation message of the transmission IO module comprises the weight information of the transmission IO module.
And the second bus is configured to determine the current occupied module from the controller module and the transmission IO module and return data sending information to the current occupied module according to the weight information in the controller occupied message and the transmission IO module occupied message.
The current occupancy module is configured to send the I/O transfer data over the first bus according to the data sending information.
In another exemplary embodiment, which may implement a high efficiency transmission PLC system, the method further includes:
and the current occupation module is configured to send release information to the second bus after the I/O transmission data is finished through the first bus. And the second bus is configured to clear the occupation state according to the received release information.
In another exemplary embodiment, which may implement an efficient transmission PLC system, a transmission IO module in the PLC system may be configured in plurality. The first bus is an RS485 bus. The second bus is a can bus.
The characteristics, technical features, advantages and implementation manners of the bus transmission method and the PLC system capable of achieving efficient transmission will be further described in a clear and easy manner with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic circuit diagram for explaining a bus transmission method of a PLC system.
Fig. 2 is a schematic circuit diagram for explaining a bus transmission method of a PLC system according to another embodiment.
Fig. 3 is a diagram for explaining a bus data message.
Fig. 4 is a data message diagram illustrating a heterogeneous bus.
Fig. 5 is a diagram for explaining the can message frame format.
Fig. 6 is a diagram for explaining an RS485 message frame format.
Description of the reference symbols
10 controller module
11 first bus
12 second bus
13 transmission IO module
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals indicate the same or structurally similar but functionally identical elements.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative. For the sake of simplicity, the drawings only schematically show the parts relevant to the present exemplary embodiment, and they do not represent the actual structure and the true scale of the product.
Fig. 1 is a schematic circuit diagram for explaining a bus transmission method of a PLC system. Referring to fig. 1, the present invention provides a data transmission method capable of implementing an efficient transmission PLC system, which can be implemented by a PLC system. The PLC system has a first bus 11 and a second bus 12. The PLC system includes a controller module 10 and a transmission IO module 13 respectively configured to a first bus 11 and a second bus 12. The first bus 11 is capable of transmitting data messages. The second bus 12 can obtain the occupancy message. The controller module 10 and the transmission IO module 13 can send out an occupation message. The first bus 11 is a single master polling mode bus. The second bus 12 is a multi-master contention access mode bus. The data transmission method capable of realizing the high-efficiency transmission of the PLC system comprises the following steps:
step S101, if the controller module 10 and the transmission IO module 13 respectively receive the I/O transmission data, the controller module 10 and the transmission IO module 13 respectively send the occupation packet of the controller and the occupation packet of the transmission IO module 13 to the second bus 12. The occupancy message of the controller includes weight information of the controller module 10. The occupation packet of the transmission IO module 13 includes the weight information of the transmission IO module 13.
Step S102, the second bus 12 determines the current occupied module from the controller module 10 and the transmission IO module 13 according to the weight information in the controller occupied message and the transmission IO module 13 occupied message, and returns data transmission information to the current occupied module.
Step S103, the currently occupied module sends I/O transmission data through the first bus 11 according to the data sending information.
In the implementation process of the present invention, when the system bus runs, the transmission IO module 13 first sends a message for occupying the bus on the second bus 12, if the occupation is successful, the module can send data through the first bus 11, and after the sending is completed, the transmission IO module 13 sends a message for releasing the bus on the second bus 12.
Referring to fig. 3 and 4, a0 denotes the start of a-module data and a1 denotes the end of a-module data. b0 denotes the b module data start, b1 denotes the b module data end. c0 denotes the c module data start and c1 denotes the c module data end. A … denotes a module data, B … denotes B module data, and C … denotes C module data. Fig. 4 shows a time sequence of a message when heterogeneous buses simultaneously work, and the specific working principle is as follows: when the heterogeneous bus runs, the module firstly sends a message occupying the heterogeneous bus on the can bus, if the occupation is successful, namely the can message is successfully sent, the module can send data through the RS485 bus in the heterogeneous bus, and after the sending is completed, the module sends a message releasing the heterogeneous bus on the can bus. If the unoccupied bus is successful, the module needs to wait for other modules to release the message of the heterogeneous bus. An unoccupied success indicates that a module with a higher priority in a multi-master contention access is requesting occupation of the heterogeneous bus.
The implementation process of the module for sending data through the heterogeneous bus is as follows: firstly, the address of the IO is obtained through the id in the can occupation message, and then the data of the IO is obtained through the RS485 message. For example, the module c first receives a bus message occupied by can of the module a, knows that the IO module will send data, and then the module c receives the data sent by the module a through the RS485, and finally the module a releases the heterogeneous bus. The message format for occupying the heterogeneous bus is shown in fig. 5, and the message format for releasing the heterogeneous bus is shown in fig. 6.
In another exemplary embodiment of the data transmission method, after step S103, the method further includes:
step S104, after the current occupied module finishes I/O data transmission through the first bus 11, the current occupied module sends release information to the second bus 12.
In step S105, the second bus 12 clears the occupied state according to the received release information and returns to step S101.
The two buses exert respective best functions, and a transmission line in the PLC system is cooperatively established, so that the performance and reliability of the system are improved.
In another exemplary embodiment of the data transmission method, the occupied packet includes a start transmission instruction packet and an end transmission instruction packet.
In another exemplary embodiment of the data transmission method, step S102 includes:
the second bus 12 determines a current occupied module from the controller module 10 and the transmission IO module 13 and returns data transmission information to the current occupied module according to the start transmission instruction message in the controller occupied message and the weight information in the transmission IO module 13 occupied message. If the unoccupied state is successful, the module needs to wait for other modules to send release information. An unoccupied success indicates that a module with a higher priority in a multi-master contention access is requesting to occupy the bus.
In another exemplary embodiment of the data transmission method, step S104 includes:
after the current occupied module finishes I/O data transmission through the first bus 11, the current occupied module sends a transmission finishing instruction message in the occupied message to the second bus 12. And ending the transmission of the instruction message to be release information.
Fig. 2 is a schematic circuit diagram for explaining a bus transmission method of a PLC system according to another embodiment. Referring to fig. 2, in an embodiment of the bus transmission method, the transmission IO module 13 in the PLC system may be configured in plurality. The plurality of transmission modules can respectively take charge of different data contents and enable the data contents to be transmitted efficiently in the PLC system.
In another exemplary embodiment of the data transmission method, the first bus 11 is an RS485 bus. The second bus 12 is a can bus. The RS485 bus is a typical single-master polling bus, and the can bus is a typical multi-master contention access bus. The two buses ensure the transmission capability of the line and improve the performance of the system.
As shown in fig. 1, the present invention also provides a PLC system capable of realizing efficient transmission, which has a first bus 11 and a second bus 12. The PLC system includes a controller module 10 and a transmission IO module 13 respectively configured to a first bus 11 and a second bus 12. The first bus 11 is capable of transmitting data messages. The second bus 12 can obtain the occupancy message. The controller module 10 and the transmission IO module 13 can send out an occupation message. The first bus 11 is a single master polling mode bus. The second bus 12 is a multi-master contention access mode bus.
If the controller module 10 and the transmission IO module 13 receive the I/O transmission data, respectively, the controller module 10 and the transmission IO module 13 are configured to send an occupation packet of the controller and an occupation packet of the transmission IO module 13 to the second bus 12, respectively. The occupancy message of the controller includes weight information of the controller module 10. The occupation packet of the transmission IO module 13 includes the weight information of the transmission IO module 13.
The second bus 12 is configured to determine a currently occupied module from the controller module 10 and the transmission IO module 13 and return data transmission information to the currently occupied module according to the weight information in the controller occupied message and the transmission IO module 13 occupied message.
The currently engaged module is configured to transmit I/O transfer data via the first bus 11 according to the data transmission information.
In another exemplary embodiment, which may implement a high efficiency transmission PLC system, the method further includes:
and the current occupation module is configured to send release information to the second bus 12 after finishing I/O data transmission through the first bus 11. A second bus 12 configured to clear the occupied state by the second bus 12 according to the received release information.
As shown in fig. 2, in another exemplary embodiment that can implement a high-efficiency transmission PLC system, the transmission IO module 13 in the PLC system may be configured in plurality. The first bus 11 is an RS485 bus. The second bus 12 is a can bus.
It should be understood that although the present description is described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein as a whole may be suitably combined to form other embodiments as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A data transmission method capable of realizing high-efficiency transmission of a PLC system is characterized in that the data transmission method can be realized by a PLC system; the PLC system has a first bus (11) and a second bus (12); the PLC system comprises a controller module (10) and a transmission IO module (13) which are respectively configured on the first bus (11) and the second bus (12); the first bus (11) is capable of transmitting data messages; the second bus (12) is capable of acquiring an occupancy message; the controller module (10) and the transmission IO module (13) can send the occupation message; the first bus (11) is a single-master polling mode bus; the second bus (12) is a multi-master contention access mode bus;
the data transmission method capable of realizing the high-efficiency transmission PLC system comprises the following steps:
step S101, if the controller module (10) and the transmission IO module (13) respectively receive I/O transmission data, the controller module (10) and the transmission IO module (13) respectively send an occupation message of the controller module and an occupation message of the transmission IO module (13) to the second bus (12); the occupied message of the controller comprises the weight information of the controller module (10); the occupation message of the transmission IO module (13) comprises the weight information of the transmission IO module (13);
step S102, the second bus (12) determines a current occupied module from the controller module (10) and the transmission IO module (13) according to the controller occupied message and the weight information in the transmission IO module (13) occupied message, and returns data sending information to the current occupied module;
step S103, the current occupied module sends the I/O transmission data through the first bus (11) according to the data sending information.
2. The data transmission method according to claim 1, wherein the step S103 is followed by further comprising:
step S104, after the current occupied module finishes the I/O data transmission through the first bus (11), the current occupied module sends release information to the second bus (12);
and step S105, the second bus (12) clears the occupied state according to the received release information and returns to the step S101.
3. The data transmission method according to claim 2, wherein the occupation message includes a start transmission command message and an end transmission command message.
4. The data transmission method according to claim 3, wherein step S102 comprises:
and the second bus (12) determines a current occupied module from the controller module (10) and the transmission IO module (13) according to the instruction message for starting transmission in the message occupied by the controller and the weight information in the message occupied by the transmission IO module (13) and returns data transmission information to the current occupied module.
5. The data transmission method according to claim 4, wherein step S104 comprises:
after the current occupation module finishes the I/O data transmission through the first bus (11), the current occupation module sends the transmission finishing instruction message in the occupation message to the second bus (12); the transmission ending instruction message is release information.
6. The data transmission method according to claim 1, wherein the transmission IO module (13) in the PLC system is configurable in plurality.
7. The data transmission method according to claim 1, characterized in that the first bus (11) is an RS485 bus; the second bus (12) is a can bus.
8. A PLC system capable of realizing high-efficiency transmission, characterized by having a first bus (11) and a second bus (12); the PLC system comprises a controller module (10) and a transmission IO module (13) which are respectively configured on the first bus (11) and the second bus (12); the first bus (11) is capable of transmitting data messages; the second bus (12) is capable of acquiring an occupancy message; the controller module (10) and the transmission IO module (13) can send the occupation message; the first bus (11) is a single-master polling mode bus; the second bus (12) is a multi-master contention access mode bus;
if the controller module (10) and the transmission IO module (13) respectively receive I/O transmission data, the controller module (10) and the transmission IO module (13) are configured to respectively send an occupation message of the controller module and an occupation message of the transmission IO module (13) to the second bus (12); the occupied message of the controller comprises the weight information of the controller module (10); the occupation message of the transmission IO module (13) comprises the weight information of the transmission IO module (13);
the second bus (12) is configured to determine a currently occupied module from the controller module (10) and the transmission IO module (13) and return data transmission information to the currently occupied module according to the controller occupied message and the weight information in the message occupied by the transmission IO module (13);
the currently engaged module is configured to transmit the I/O transmission data via the first bus (11) according to the data transmission information.
9. The PLC system capable of achieving high-efficiency transmission according to claim 8, further comprising:
the current occupation module is configured to send release information to the second bus (12) after the I/O data transmission is finished through the first bus (11);
the second bus (12) configured to clear the occupation state by the second bus (12) according to the release information received.
10. The PLC system capable of realizing high-efficiency transmission according to claim 8 or 9, wherein the transmission IO module (13) in the PLC system is configurable into a plurality of modules; the first bus (11) is an RS485 bus; the second bus (12) is a can bus.
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