CN115695524A - Communication method and medium for upper device and PLC device - Google Patents
Communication method and medium for upper device and PLC device Download PDFInfo
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Abstract
The invention discloses a communication method and a medium of upper equipment and PLC equipment, which comprises the following steps: s1, establishing communication connection between the upper equipment and PLC equipment based on a CIP protocol; s2, the PLC equipment receives and executes a control instruction sent by the upper equipment; before establishing the communication connection between the upper device and the PLC device, the upper device needs to be configured, and the specific steps are as follows: acquiring PLC equipment information, and dividing the PLC equipment into groups to obtain grouping information; storing the grouping information in an upper device, and determining a path of a control command sent by the upper device; the grouping information comprises an identification code of the PLC equipment, a storage interval code stored in the upper equipment by the PLC equipment, and a network communication address code of the PLC equipment; and the network communication address codes of the PLC devices with the same identification codes are the same.
Description
Technical Field
The invention relates to an industrial automation technology, in particular to a communication method and a medium of upper equipment and PLC equipment.
Background
The monitoring system is widely used for monitoring the industrial process, and comprises an upper device and a plurality of control devices, wherein the upper device monitors the operation state of the control devices by reading and writing data and sending instructions of the control devices.
The AB PLC is a control device frequently used in industrial automation, has strong functions and flexible configuration, and can provide wide communication configuration and memory options; in practical application, the upper device needs to communicate with the PLC device through RSLinx software and OPC (OLE for process Control) protocol provided by a manufacturer, the RSLinx software and the OPC protocol only support a Windows operating system at present, and the RSLinx software does not support hierarchical group management of the device at present, and when a single upper device needs to manage a large number of PLC devices, secondary development is needed to complete management of the device.
Disclosure of Invention
The invention aims to provide a communication method and a communication medium of upper equipment and PLC equipment, and solves the limitation that the upper equipment needs to integrate third-party software and only can adopt a Windows operating system.
The invention is realized by the following technical scheme:
a first aspect provides a communication method between a host device and a PLC device, including the steps of:
establishing communication connection between the upper equipment and the PLC equipment based on a CIP protocol;
and the PLC equipment receives and executes the control command sent by the upper equipment.
The upper equipment and the PLC equipment realize communication through a CIP protocol, the CIP protocol is irrelevant to an operating system platform and can ensure that communication is realized across the operating system platform;
the CIP protocol has the independence of transmission media, and when different network communications are realized, data exchange between the upper equipment and the PLC equipment is completed by adopting a general underlying network operation interface, so that the communication can be realized in different field bus standards; network-specific communication modules may also be developed to accommodate the actual fieldbus standard or a newly introduced network standard.
Further, before establishing the communication connection between the upper device and the PLC device, the upper device needs to be configured, which includes the following specific steps:
acquiring PLC equipment information, and dividing the PLC equipment into groups to obtain grouping information;
storing the grouping information in an upper device, and determining a path of a control command sent by the upper device;
the grouping information comprises an identification code of the PLC equipment, a storage interval code of the PLC equipment stored in upper equipment, and a network communication address code of the PLC equipment;
and the network communication address codes of the PLC devices with the same identification code are the same.
Further, the groups include a global level, a device group level, and a device level, the global level including one or more device group levels, the device group level including one or more device levels;
one of the device levels corresponds to one PLC device, and the device level includes part or all of data of the PLC device.
Each equipment level with the same PLC equipment identification code has the same network communication address code and different storage interval codes, the global level comprises all equipment group levels, and a plurality of equipment levels contained in one equipment group level have different PLC equipment identification codes;
when the equipment level contains all data of the PLC equipment, the equipment group processes all data of the PLC equipment;
when the equipment level contains partial data of the PLC equipment, the equipment group only processes the data contained in the equipment group by the PLC equipment.
Further, one PLC device corresponds to one or more device stages.
Under the condition that the data scale of a single PLC device is large, the data of the PLC device is divided into a plurality of parts, each part of data corresponds to one device level, the device level processes the corresponding data, the upper device can process the same PLC device in parallel, efficient communication and control are carried out, and the communication efficiency is improved.
Further, after the PLC device is divided into groups to obtain grouping information, the method further includes the following steps:
setting a priority according to the management processing flow of the upper equipment to obtain a priority queue;
and determining a path of the control command sent by the upper equipment according to the priority queue and the grouping information.
The priority queues of all the device levels contained in one device group level are the same, when needed, a plurality of device levels in the device group level can be grouped into device levels, and the priority queues of all the device levels in the same device level group are the same.
Further, after the PLC device receives the read control instruction sent by the upper device, the PLC device sends the response packet to the upper device, and the response packet is analyzed in the upper device.
Further, after the PLC device receives a write control command sent by the upper device, the PLC device writes data and sends the data to the upper device.
Further, after receiving the connection control instruction sent by the upper device, the PLC device establishes a TCP connection between the PLC device and the upper device.
Further, after receiving the communication termination instruction sent by the upper device, the PLC device disconnects the TCP connection between the PLC device and the upper device.
A second aspect provides a computer-readable storage medium storing a computer program that causes a computer to execute the above-described communication method.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the upper equipment and the PLC equipment realize communication through a CIP protocol, the CIP protocol is irrelevant to an operating system platform, communication across the operating system platform can be ensured, and the problem of limitation that the upper equipment needs to integrate third-party software and only can adopt a Windows operating system is solved;
the CIP protocol has the independence of transmission media, and when different network communications are realized, data exchange between the upper equipment and the PLC equipment is completed by adopting a general underlying network operation interface, so that the communication can be realized in different field bus standards; network-specific communication modules may also be developed to accommodate the actual fieldbus standard or a newly introduced network standard.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:
FIG. 1 is a main flow diagram;
fig. 2 shows management levels of the upper device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
This embodiment 1 provides a communication method between a host device and a PLC device, as shown in fig. 1, including the following steps:
s1, establishing communication connection between the upper equipment and PLC equipment based on a CIP protocol;
and S2, the PLC equipment receives and executes the control command sent by the upper equipment.
The upper equipment and the PLC equipment realize communication through a CIP protocol, the CIP protocol is irrelevant to an operating system platform and can ensure that communication is realized across the operating system platform;
the CIP protocol has the independence of transmission media, and when different network communications are realized, data exchange between the upper equipment and the PLC equipment is completed by adopting a general underlying network operation interface, so that the communication can be realized in different field bus standards; network-specific communication modules may also be developed to accommodate the actual fieldbus standard or a newly introduced network standard.
In a specific embodiment, before establishing the communication connection between the upper device and the PLC device, the upper device needs to be configured, which includes the following specific steps:
acquiring PLC equipment information, and dividing the PLC equipment into groups to obtain grouping information;
storing the grouping information in an upper device, and determining a path of a control command sent by the upper device;
the grouping information comprises an identification code of the PLC equipment, a storage interval code of the PLC equipment stored in upper equipment, and a network communication address code of the PLC equipment;
and the network communication address codes of the PLC devices with the same identification code are the same.
In a specific embodiment, as shown in fig. 2, the groups include a global level, a device group level, and a device level, the global level includes one or more device group levels, and the device group level includes one or more device levels;
one of the device levels corresponds to one of the PLC devices, and the device level includes part or all of data of the PLC device.
When the equipment level contains all data of the PLC equipment, the equipment group processes all data of the PLC equipment;
when the equipment level contains partial data of the PLC equipment, the equipment group only processes the data contained in the equipment group by the PLC equipment.
In a specific embodiment, one PLC device corresponds to one or more device levels.
Under the condition that the data scale of a single PLC device is large, the data of the PLC device is divided into a plurality of parts, each part of data corresponds to one device level, the device level processes the corresponding data, the upper device can process the same PLC device in parallel, efficient communication and control are carried out, and the communication efficiency is improved.
In a specific embodiment, after the PLC device is divided into groups to obtain grouping information, the method further includes the following steps:
setting a priority according to the management processing flow of the upper device to obtain a priority queue;
and determining a path of the control command sent by the upper equipment according to the priority queue and the grouping information.
In a specific embodiment, the priority queue includes a global priority queue and an equipment group priority queue; the global level priority queue is for all device levels within a global level and the device group level priority queue is for all device levels within a device group level.
In a specific embodiment, each device level having the same identification code of the PLC device has the same network communication address code and different storage section codes, one device group level includes one or more device levels, a plurality of device levels included in one device group level have different PLC device identification codes, priority queues of all device levels included in one device group level are the same, when necessary, the device levels in the device group levels can be grouped, priority queues of all device levels in the same device level group are the same, and the global level includes all device group levels.
In a specific embodiment, the upper device determines a network communication address code sent by a control instruction of the upper device according to the received instruction and the priority queue, and sends the control instruction to the corresponding PLC device according to the network communication address code;
if the received command is a global-level control command, sending the control command to all equipment levels corresponding to the network communication address code in the global level through the network according to the global-level priority queue;
if the received command is a control command for a device group level, sending the control command to all device levels corresponding to the network communication address code in the device group level through the network according to the device group level priority queue;
and if the received command is a control command for the equipment levels under different equipment group levels, sending the control command to each equipment level corresponding to the network communication address code under different equipment group levels through the CIP protocol network according to the global level priority queue and the equipment group level priority queue.
In a specific embodiment, the PLC device is a common AB PLC device.
Example 2
The upper device determines a network communication address code sent by a control instruction of the upper device according to the received instruction and the priority queue, and sends the control instruction to the corresponding PLC device according to the network communication address code, wherein the specific flow of the communication between the upper device and the PLC device is as follows:
(1) If the instruction received by the upper device is a global-level reading control instruction, determining a network communication address code of the PLC device to which the upper device should send the reading control instruction according to a global-level priority queue, and sending the reading control instruction to all device levels corresponding to the network communication address code in a global level through a network according to the network communication address code;
after receiving a reading control instruction sent by the upper device, the PLC device sends a response message to the upper device through a network, analyzes the response message in the upper device and judges whether the analysis is successful or not;
if the analysis is successful, refreshing the data information to obtain response message data; if the analysis fails, an error process is performed, which is not required here.
(2) If the instruction received by the upper device is a global-level write control instruction, determining a network communication address code of the PLC device to which the upper device should send the write control instruction according to a global-level priority queue, and sending the write control instruction to all device levels corresponding to the network communication address code in the global level through a network according to the network communication address code;
after receiving a write-in control instruction sent by upper equipment, the PLC equipment writes data in from the PLC equipment, sends the data to the upper equipment and judges whether the write-in is successful or not; if the write fails, error handling is performed, where no request is made.
(3) If the instruction received by the upper device is a global-level connection control instruction, determining a network communication address code of the PLC device to which the upper device should send the connection control instruction according to a global-level priority queue, and sending the connection control instruction to all device levels corresponding to the network communication address code in the global level through a network according to the network communication address code;
after the PLC equipment receives a connection control instruction sent by upper equipment, TCP connection between the PLC equipment and the upper equipment is established; sending an NOP message to the PLC equipment for detecting whether the TCP connection is successful;
if the TCP connection is successful, information interaction can be continuously realized; if the TCP connection fails, reestablishing the communication connection between the upper equipment and the PLC equipment;
(4) If the instruction received by the upper device is a global-level communication ending instruction, determining a network communication address code of the upper device, which is used for sending the communication ending instruction to the PLC device, according to a global-level priority queue, and sending the communication ending instruction to all device levels corresponding to the network communication address code in the global level through a network according to the network communication address code;
after the PLC equipment receives a communication ending instruction sent by upper equipment, the TCP connection between the PLC equipment and the upper equipment is disconnected; and sending a session logout message to the PLC equipment, and closing the TCP connection between the upper equipment and the PLC equipment.
(5) If the instruction received by the upper device is a reading control instruction of a device group level, determining a network communication address code of the PLC device to which the upper device should send the reading control instruction according to a device group level priority queue, and sending the reading control instruction to all device levels corresponding to the network communication address code in the device group level through a network according to the network communication address code;
after the PLC equipment receives a reading control instruction sent by upper equipment, the PLC equipment sends a response message to the upper equipment through a network, the response message is analyzed in the upper equipment, and whether the analysis is successful is judged;
if the analysis is successful, refreshing the data information to obtain response message data; if the analysis fails, an error process is performed, which is not required here.
(6) If the instruction received by the upper device is a write-in control instruction of a device group level, determining a network communication address code of the PLC device to which the write-in control instruction should be sent by the upper device according to a device group level priority queue, and sending the write-in control instruction to all device levels corresponding to the network communication address code in the device group level through a network according to the network communication address code;
after receiving a write-in control instruction sent by upper equipment, the PLC equipment writes data in from the PLC equipment, sends the data to the upper equipment and judges whether the write-in is successful or not; if the write fails, error handling is performed, where no request is made.
(7) If the instruction received by the upper device is a connection control instruction of a device group level, determining a network communication address code of the PLC device to which the upper device should send the connection control instruction according to a device group level priority queue, and sending the connection control instruction to all device levels corresponding to the network communication address code in the device group level through a network according to the network communication address code;
after the PLC equipment receives a connection control instruction sent by upper equipment, TCP connection between the PLC equipment and the upper equipment is established; sending an NOP message to the PLC equipment for detecting whether the TCP connection is successful or not;
if the TCP connection is successful, information interaction can be continuously realized; if the TCP connection fails, reestablishing the communication connection between the upper equipment and the PLC equipment;
(8) If the instruction received by the upper device is a communication ending instruction of a device group level, determining a network communication address code of the PLC device to which the upper device should send the communication ending instruction according to a device group level priority queue, and sending the communication ending instruction to all device levels corresponding to the network communication address code in the device group level through a network according to the network communication address code;
after the PLC equipment receives a communication ending instruction sent by upper equipment, the TCP connection between the PLC equipment and the upper equipment is disconnected; and sending a session logout message to the PLC equipment, and closing the TCP connection between the upper equipment and the PLC equipment.
(9) If the instruction received by the upper device is a device group-level reading control instruction, determining a network communication address code which the upper device should send the reading control instruction to the PLC device according to a global level priority queue and a device group level priority queue, and sending the reading control instruction to each device level corresponding to the network communication address code under different device group levels through a CIP protocol network according to the network communication address code;
after receiving a reading control instruction sent by the upper device, the PLC device sends a response message to the upper device through a network, analyzes the response message in the upper device and judges whether the analysis is successful or not;
if the analysis is successful, refreshing the data information to obtain response message data; if the analysis fails, an error process is performed, which is not required here.
(10) If the instruction received by the upper device is a write control instruction of a device group level, determining a network communication address code of the PLC device to which the upper device should send the write control instruction according to a global level priority queue and a device group level priority queue, and sending the write control instruction to each device level corresponding to the network communication address code under different device group levels through a CIP (common protocol over Internet protocol) network according to the network communication address code;
after receiving a write-in control instruction sent by upper equipment, the PLC equipment writes data in from the PLC equipment, sends the data to the upper equipment and judges whether the write-in is successful or not; if the write fails, error handling is performed, where no request is made.
(11) If the instruction received by the upper device is a connection control instruction of a device group level, determining a network communication address code which the upper device should send the connection control instruction to the PLC device according to a global level priority queue and a device group level priority queue, and sending the connection control instruction to each device level corresponding to the network communication address code under different device group levels through a CIP protocol network according to the network communication address code;
after the PLC equipment receives a connection control instruction sent by upper equipment, TCP connection between the PLC equipment and the upper equipment is established; sending an NOP message to the PLC equipment for detecting whether the TCP connection is successful;
if the TCP connection is successful, information interaction can be continuously realized; if the TCP connection fails, reestablishing the communication connection between the upper equipment and the PLC equipment;
(12) If the instruction received by the upper device is a communication ending instruction of a device group level, determining a network communication address code which the upper device should send the communication ending instruction to the PLC device according to a global level priority queue and a device group level priority queue, and sending the communication ending instruction to each device level corresponding to the network communication address code under different device group levels through a CIP protocol network according to the network communication address code;
after the PLC equipment receives a communication ending instruction sent by upper equipment, the TCP connection between the PLC equipment and the upper equipment is disconnected; and sending a session logout message to the PLC equipment, and closing the TCP connection between the upper equipment and the PLC equipment.
Example 3
The present embodiment 3 provides a computer-readable storage medium storing a computer program that causes a computer to execute the above-described communication method.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A communication method of upper equipment and PLC equipment is characterized by comprising the following steps:
based on CIP protocol, establishing communication connection between the upper device and the PLC device;
and the PLC equipment receives and executes the control instruction sent by the upper equipment.
2. The communication method of the upper device and the PLC device according to claim 1, wherein before the communication connection between the upper device and the PLC device is established, the upper device needs to be configured, and the specific steps are as follows:
acquiring PLC equipment information, and dividing the PLC equipment into groups to obtain grouping information;
storing the grouping information in an upper device, and determining a path of a control instruction sent by the upper device;
the grouping information comprises an identification code of the PLC equipment, a storage interval code of the PLC equipment stored in the upper equipment, and a network communication address code of the PLC equipment;
and the network communication address codes of the PLC devices with the same identification code are the same.
3. The communication method of the upper device and the PLC device according to claim 2, wherein the groups comprise a global level, a device group level and a device level, the global level comprises one or more device group levels, and the device group level comprises one or more device levels;
one of the equipment levels corresponds to one of the PLC equipments, and the equipment level includes part or all of data of the PLC equipment.
4. The method as claimed in claim 3, wherein one PLC device corresponds to one or more device levels.
5. The communication method between the host device and the PLC device according to claim 2, wherein after the PLC device is grouped to obtain the grouping information, the method further comprises the steps of:
setting a priority according to the management processing flow of the upper equipment to obtain a priority queue;
and determining a path of a control instruction sent by the upper equipment according to the priority queue and the grouping information.
6. The method according to claim 1, wherein after the PLC device receives the read control command sent by the host device, the PLC device sends the response packet to the host device, and the host device performs the response packet analysis.
7. The communication method between the host device and the PLC device according to claim 1, wherein, when the PLC device receives a write control command transmitted from the host device, the PLC device writes data and transmits the data to the host device.
8. The method according to claim 1, wherein the PLC device establishes the TCP connection between the PLC device and the host device after receiving the connection control command sent by the host device.
9. The method as claimed in claim 8, wherein the PLC device disconnects the TCP connection between the PLC device and the host device after receiving the communication termination command sent by the host device.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program that causes a computer to execute the communication method according to any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102147608A (en) * | 2010-02-09 | 2011-08-10 | 上海宝信软件股份有限公司 | Communication system of upper device and of PLC (programmable logic controller) in monitoring system |
| US20110270976A1 (en) * | 2008-09-19 | 2011-11-03 | Masama Yasuda | Network protocol processing system and network protocol processing method |
| US20180060273A1 (en) * | 2016-08-29 | 2018-03-01 | Excelero Storage Ltd. | Disk access operation recovery techniques |
| US10067549B1 (en) * | 2010-04-20 | 2018-09-04 | Modius Inc | Computed devices |
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2022
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110270976A1 (en) * | 2008-09-19 | 2011-11-03 | Masama Yasuda | Network protocol processing system and network protocol processing method |
| CN102147608A (en) * | 2010-02-09 | 2011-08-10 | 上海宝信软件股份有限公司 | Communication system of upper device and of PLC (programmable logic controller) in monitoring system |
| US10067549B1 (en) * | 2010-04-20 | 2018-09-04 | Modius Inc | Computed devices |
| US20180060273A1 (en) * | 2016-08-29 | 2018-03-01 | Excelero Storage Ltd. | Disk access operation recovery techniques |
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