CN111698136B - Data transmission method and data transmission system of high-reliability PLC - Google Patents
Data transmission method and data transmission system of high-reliability PLC Download PDFInfo
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- CN111698136B CN111698136B CN202010351331.5A CN202010351331A CN111698136B CN 111698136 B CN111698136 B CN 111698136B CN 202010351331 A CN202010351331 A CN 202010351331A CN 111698136 B CN111698136 B CN 111698136B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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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
- G05B19/058—Safety, monitoring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
- H04L12/40195—Flexible bus arrangements involving redundancy by using a plurality of nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
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Abstract
The invention provides a data transmission method of a high-reliability PLC and a data transmission system of the high-reliability PLC, wherein the data transmission system of the high-reliability PLC is provided with an iobus bus (13), a controller module (10) which can be configured on the iobus bus (13), a redundant main IO module (11) and a redundant standby IO module (12). The data messages can be transmitted on the iobus bus (13). The redundant main IO module (11) and the redundant standby IO module (12) can acquire data from the iobus bus (13). The invention adopts the normal iobus communication link to realize the data synchronization and heartbeat transmission between the two IO modules, and achieves the aim of realizing the data synchronization and role switching between the redundant modules without depending on an additional communication path.
Description
Technical Field
The invention relates to module redundancy in a PLC system. The invention particularly relates to a data transmission method and a data transmission system of a high-reliability PLC.
Background
When the IO modules in the current PLC system realize data synchronization and module switching, the data synchronization and redundancy switching are mainly realized through the redundant bus links special for the main IO modules and the standby IO modules, and the specific process is as follows: the main controller module communicates (exchanges data) with the main IO module through the iobus, and the main IO module sends data sent by the main controller module to the standby IO module through the redundant bus and sends heartbeat signals all the time. And after receiving the data sent by the main IO module, the standby IO module continues to monitor the heartbeat signal on the redundant bus, and when the heartbeat signal of the main IO module cannot be monitored, the standby IO module considers that the main IO module has a fault and actively converts the fault into the main IO module. This approach requires independent redundant bus, increases the complexity of the lines, and requires higher cost to implement IO module redundancy.
Disclosure of Invention
The invention aims to provide a data transmission method of a high-reliability PLC (programmable logic controller), which adopts a normal iobus communication link to realize data synchronization and heartbeat transmission between two IO modules.
Another object of the present invention is to provide a data transmission system of a highly reliable PLC, which employs a normal iobus communication link to achieve data synchronization and heartbeat transmission between two IO modules.
The invention provides a data transmission method of a high-reliability PLC (programmable logic controller), wherein a data transmission system of the high-reliability PLC is provided with an iobus bus, a controller module, a redundant main IO module and a redundant standby IO module, wherein the controller module can be configured on the iobus bus. And the data message can be transmitted on the iobus bus. The redundant main IO module and the redundant standby IO module can acquire data from the iobus bus. The redundant main IO module has main module identification information, and the redundant standby IO module has standby module identification information. The data transmission method of the high-reliability PLC comprises the following steps:
step S101, the controller module receives a data message after receiving program data transmission interruption or remote data transmission interruption information. The controller module generates a data transmission request message according to the identification information of the main module.
And S102, the controller module sends a data transmission request message to the redundant main IO module through the iobus according to the main module identification information of the redundant main IO module.
And step S103, the redundant master IO module receives the data transmission request message through the iobus bus, and the redundant master IO module sends a response data message to the controller module through the iobus bus.
The redundant standby IO module monitors an iobus bus. After receiving the data transmission request message, the redundant standby IO module judges whether a response data message which can be acquired from the iobus bus corresponds to the data transmission request message, if so, the response data message is locally backed up, and if not, the standby module identification information is set as the main module identification information.
And step S104, the controller module sends a data transmission request message to the redundant standby IO module according to the identification information of the main module of the redundant standby IO module in the step S103, and the redundant standby IO module sends a response data message to the controller module through the iobus bus.
In another exemplary embodiment of the data transmission method, step S102 includes: the controller module judges whether the identification information of the main module or the identification information of the standby module exists, if so, the controller module sends a data transmission request message to the redundant main IO module through the iobus according to the identification information of the main module of the redundant main IO module.
In another exemplary embodiment of the data transmission method, step S103 further includes: the controller module judges whether the main module identification information of the redundant main IO module is valid data information, if so, the redundant main IO module receives a data transmission request message through the iobus bus; if not, the process returns to step S101.
In another exemplary embodiment of the data transmission method, a data packet is received in step S101. The step of the controller module generating the data transmission request message according to the identification information of the main module further comprises: the controller module judges whether the data message has frame start identification information, address identification information and frame check information, if so, the controller module generates a data transmission request message according to the identification information of the main module; if not, returning to the step until the data message has the frame start identification information, the address identification information and the frame check information.
In another exemplary embodiment of the data transmission method, the step of setting the spare module identification information as the main module identification information in step S103 includes:
and judging whether the standby module identification information is set to be valid information within set time, if so, setting the standby module identification information to be main module identification information, and if not, returning to the step S101.
In another exemplary embodiment of the data transmission method, the data transmission request message includes information of a current destination address bit and a current source address bit. The step of determining whether the current response data packet corresponds to the data transmission request packet in step S103 includes: and judging whether the destination address bit information in the current response data message is the source address bit information in the data transmission request message or not and whether the source address bit information in the current response data message is the destination address bit information in the data transmission request message or not.
The invention also provides a data transmission system of the high-reliability PLC, which comprises an iobus bus, a controller module, a redundant main IO module and a redundant standby IO module, wherein the controller module can be configured on the iobus bus. And the data message can be transmitted on the iobus bus. The redundant main IO module and the redundant standby IO module can acquire data from the iobus bus. The redundant master IO module has master module identification information. The redundant standby IO module is provided with standby module identification information.
The controller module is configured to receive the data message after receiving a program data transmission interrupt or a remote data transmission interrupt message. The controller module generates a data transmission request message according to the identification information of the main module.
The controller module is configured to send a data transmission request message to the redundant main IO module through the iobus bus according to the main module identification information of the redundant main IO module.
The redundant main IO module is configured to receive the data transmission request message through the iobus, and send a response data message to the controller module through the iobus.
The redundant standby IO module monitors an iobus bus. After receiving the data transmission request message, the redundant standby IO module judges whether a response data message which can be acquired from the iobus bus corresponds to the data transmission request message, if so, the response data message is locally backed up, and if not, the standby module identification information is set as the main module identification information.
The controller module is configured to send a data transmission request message to the redundant standby IO module according to the identification information of the main module of the redundant standby IO module, and the redundant standby IO module sends a response data message to the controller module through the iobus bus.
In another exemplary embodiment of the data transmission system, the controller module determines whether the primary module identification information or the secondary module identification information exists, and if so, the controller module sends a data transmission request message to the redundant primary IO module through the iobus bus according to the primary module identification information of the redundant primary IO module.
In another exemplary embodiment of the data transmission system, the controller module determines whether main module identification information of the redundant main IO module is valid data information, and if so, the redundant main IO module receives a data transmission request message through the iobus bus; if not, returning to the configuration process of the controller module.
In another exemplary embodiment of the data transmission system, the setting of the spare module identification information as the main module identification information includes:
and judging whether the standby module identification information is set to be effective information within set time, if so, setting the standby module identification information to be main module identification information, and if not, returning to the configuration process of the controller module.
The characteristics, technical features, advantages and implementation manners of the data transmission method and the data transmission system of the highly reliable PLC will be further described in an explicit and easily understood manner with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram illustrating a data transmission system of a highly reliable PLC according to the present invention.
Fig. 2 is a schematic data processing flow diagram for explaining a data transmission method of a highly reliable PLC according to the present invention.
Fig. 3 is a diagram for explaining a format of a message frame in a data transmission method of a highly reliable PLC according to the present invention.
Description of the reference symbols
10 controller module
11 redundant main IO module
12 redundant spare IO module
13iobus bus
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.
Referring to fig. 1, the present invention provides a data transmission method of a high-reliability PLC, in which a data transmission system of the high-reliability PLC includes an iobus bus 13, a controller module 10 capable of being configured on the iobus bus 13, a redundant master IO module 11, and a redundant backup IO module 12. Data messages can be transmitted over the iobus bus 13. The redundant master IO module 11 and the redundant standby IO module 12 can obtain data from the iobus bus 13. The redundant main IO module 11 has main module identification information, and the redundant standby IO module 12 has standby module identification information. The data transmission method of the high-reliability PLC comprises the following steps:
in step S101, the controller module 10 receives a data message after receiving the program data transmission interruption or remote data transmission interruption information. The controller module 10 generates a data transmission request message based on the main module identification information.
In step S102, the controller module 10 sends a data transmission request message to the redundant main IO module 11 through the iobus bus 13 according to the main module identification information of the redundant main IO module 11.
Step S103, the redundant master IO module 11 receives the data transmission request message through the iobus bus 13, and the redundant master IO module 11 sends a response data message to the controller module 10 through the iobus 13.
The redundant IO module 12 listens to the iobus bus 13. After receiving the data transmission request message, the redundant standby IO module determines whether the reply data message that can be obtained from the iobus bus 13 corresponds to the data transmission request message, e.g., whether the reply data message includes "main module identification information" in the data transmission request message, if so, identification information exists, the reply data message is locally backed up, and if not, the standby module identification information is set as the main module identification information, i.e., the identification information does not exist.
In step S104, the controller module 10 sends a data transmission request message to the redundant IO module 12 according to the main module identification information of the redundant IO module 12 in step S103, and the redundant IO module 12 sends a response data message to the controller module 10 through the iobus bus 13.
Each IO module has a unique address identification code, two adjacent modules of the same type can form a redundancy relationship, an odd address is a main module and an even address is a standby module in default, for example, the addresses of two adjacent IO modules are 3 and 4 respectively, then the module 3 is the main module and the module 4 is the standby module.
Referring to fig. 2, in an implementation process of the data transmission method, when the redundant main IO module 11 operates normally, the redundant main IO module 11 responds to the request of the controller module 10 after receiving the request of the controller module 10, and sends a response data message. The redundant standby IO module 12 learns that the redundant main IO module 11 responds to the request of the controller module 10 by monitoring, and obtains the data of the redundant main IO module 11 through the responded data message, thereby completing the data synchronization.
Referring to fig. 3, the request message indicates that the main controller module (address 1) requests data of the IO module (address 3), and the redundant main IO module 11 (address 3) responds to the main controller module. In the process of requesting and responding, the redundant standby IO module 12 (address 4) may monitor the request and response messages, that is, the standby module may receive and analyze both the two messages through its interrupt response program, and may analyze the response message of the main module through the destination address and the source address, so as to obtain the response data of the main module from the response message.
When the redundant main IO module 11 is abnormally operated, the redundant main IO module 11 does not respond to the request of the controller module 10 after the controller module 10 sends the request, and the redundant standby IO module 12 can determine that the redundant main IO module 11 loses the capability of normal operation after not monitoring the response of the redundant main IO module 11, thereby setting itself as a new main module and completing the role switching. The method realizes data synchronization and role switching among the redundant modules without depending on an additional communication path.
As shown in fig. 2, in another exemplary embodiment of the data transmission method, step S102 includes: the controller module 10 determines whether the primary module identification information or the backup module identification information exists, and if so, the controller module 10 sends a data transmission request message to the redundant primary IO module 11 through the iobus bus 13 according to the primary module identification information of the redundant primary IO module 11. In this step, it is necessary to confirm that both the identification information of the main module and the identification information of the standby module exist, so as to ensure that the functions of the redundant main IO module 11 and the redundant standby IO module 12 are normally operated, and the data transmission request message from the controller module 10 to the main module may be implemented.
As shown in fig. 2, in another exemplary embodiment of the data transmission method, step S103 further includes: the controller module 10 determines whether the main module identification information of the redundant main IO module 11 is valid data information, and if so, the redundant main IO module 11 receives a data transmission request message through the iobus bus 13; if not, the process returns to step S101.
In another exemplary embodiment of the data transmission method, as shown in fig. 2, a data packet is received in step S101. The step of the controller module 10 generating the data transmission request message according to the main module identification information further includes: the controller module 10 determines whether the data packet has frame start identification information, address identification information, and frame check information, and if so, the controller module 10 generates a data transmission request packet according to the identification information of the main module; if not, returning to the step until the data message has the frame start identification information, the address identification information and the frame check information.
As shown in fig. 2, in another exemplary embodiment of the data transmission method, the step of setting the spare module identification information as the main module identification information in step S103 includes:
and judging whether the standby module identification information is set to be valid information within set time, if so, setting the standby module identification information to be main module identification information, and if not, returning to the step S101. The mode realizes data synchronization and role switching without depending on an additional communication path between the redundant modules.
In another exemplary embodiment of the data transmission method, the data transmission request message includes information of a current destination address bit and a current source address bit. The step of determining whether the current response data packet corresponds to the data transmission request packet in step S103 includes: and judging whether the destination address bit information in the current response data message is the source address bit information in the data transmission request message or not and whether the source address bit information in the current response data message is the destination address bit information in the data transmission request message or not.
As shown in fig. 1, the present invention further provides a data transmission system of a high-reliability PLC, in which the data transmission system of the high-reliability PLC includes an iobus bus 13, and a controller module 10, a redundant master IO module 11, and a redundant backup IO module 12 that can be configured on the iobus bus 13. Data messages can be transmitted over the iobus bus 13. The redundant master IO module 11 and the redundant standby IO module 12 can obtain data from the iobus bus 13. The redundant master IO module 11 has master module identification information. The redundant standby IO module 12 has standby module identification information.
The controller module 10 is configured to receive a data message after receiving a program data transmission interrupt or a remote data transmission interrupt message. The controller module 10 generates a data transmission request message based on the main module identification information.
The controller module 10 is configured to send a data transmission request message to the redundant master IO module 11 through the iobus bus 13 according to the master module identification information of the redundant master IO module 11.
The redundant master IO module 11 is configured to receive a data transmission request message through the iobus bus 13, and the redundant master IO module 11 sends a response data message to the controller module 10 through the iobus 13.
The redundant IO module 12 listens to the iobus bus 13. After receiving the data transmission request message, the redundant standby IO module determines whether the response data message that can be obtained from the iobus bus 13 corresponds to the data transmission request message, if so, locally backs up the response data message, and if not, sets the standby module identification information as the main module identification information.
The controller module 10 is configured to send a data transmission request message to the redundant IO module 12 according to the main module identification information of the redundant IO module 12, and the redundant IO module 12 sends a response data message to the controller module 10 through the iobus bus 13.
The method realizes data synchronization and role switching among the redundant modules without depending on an additional communication path.
As shown in fig. 2, in another exemplary embodiment of the data transmission system, the controller module 10 determines whether the main module identification information or the auxiliary module identification information exists, and if so, the controller module 10 sends a data transmission request message to the redundant main IO module 11 through the iobus bus 13 according to the main module identification information of the redundant main IO module 11. In this step, it is necessary to confirm that both the identification information of the main module and the identification information of the standby module exist, so as to ensure that the functions of the redundant main IO module 11 and the redundant standby IO module 12 are normally operated, and the data transmission request message from the controller module 10 to the main module may be implemented.
As shown in fig. 2, in another exemplary embodiment of the data transmission system, the controller module 10 determines whether main module identification information of the redundant main IO module 11 is valid data information, and if so, the redundant main IO module 11 receives a data transmission request message through the iobus bus 13; if not, the configuration process of the controller module 10 is returned.
In another illustrative embodiment of the data transmission system, as shown in fig. 2, the controller module 10 sends a receive communication interrupt message to the iobus bus 13, with a data packet therein.
In another exemplary embodiment of the data transmission system, as shown in fig. 2, the step of setting the spare module identification information as the master module identification information includes:
and judging whether the standby module identification information is set to be valid information within set time, if so, setting the standby module identification information to be main module identification information, and if not, returning to the configuration process of the controller module 10. The mode realizes data synchronization and role switching without depending on an additional communication path between the redundant modules.
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 of a high-reliability PLC is characterized in that the data transmission method is realized by a PLC data transmission system; the PLC data transmission system is provided with an iobus bus (13), a controller module (10) which can be configured on the iobus bus (13), a redundant main IO module (11) and a redundant standby IO module (12); the iobus bus (13) can transmit data messages; the redundant main IO module (11) and the redundant standby IO module (12) can acquire data from the iobus bus (13); the redundant main IO module (11) has main module identification information; the redundant standby IO module (12) is provided with standby module identification information; the data transmission method of the high-reliability PLC comprises the following steps:
step S101, the controller module (10) receives the data message after receiving program data transmission interruption or remote data transmission interruption information; the controller module (10) generates a data transmission request message according to the identification information of the main module;
step S102, the controller module (10) sends a data transmission request message to the redundant main IO module (11) through the iobus bus (13) according to the main module identification information of the redundant main IO module (11);
step S103, the redundant master IO module (11) receives the data transmission request message through the iobus bus (13), and the redundant master IO module (11) sends a response data message to the controller module (10) through the iobus bus (13);
the redundant IO module (12) monitors the iobus bus (13); after receiving the data transmission request message, the redundant standby IO module (12) judges whether a response data message acquired from the iobus bus (13) corresponds to the data transmission request message, if so, the response data message is backed up locally, and if not, the standby module identification information is set as the main module identification information;
step S104, the controller module (10) sends a data transmission request message to the redundant standby IO module (12) according to the main module identification information of the redundant standby IO module (12) in step S103, and the redundant standby IO module (12) sends a response data message to the controller module (10) through the iobus bus (13).
2. The data transmission method according to claim 1, wherein the step S102 comprises: the controller module (10) judges whether the main module identification information or the standby module identification information exists, if so, the controller module (10) sends a data transmission request message to the redundant main IO module (11) through the iobus bus (13) according to the main module identification information of the redundant main IO module (11).
3. The data transmission method according to claim 1, wherein the step S103 further comprises: the controller module (10) judges whether the main module identification information of the redundant main IO module (11) is valid data information, if so, the redundant main IO module (11) receives the data transmission request message through the iobus bus (13); if not, returning to the step S101.
4. The data transmission method according to claim 1, wherein the data packet is received in step S101; the step of generating, by the controller module (10), a data transmission request message according to the identification information of the main module further includes: the controller module (10) judges whether the data message has frame start identification information, address identification information and frame check information, if so, the controller module (10) generates a data transmission request message according to the identification information of the main module, and if not, the step is returned until the data message has the frame start identification information, the address identification information and the frame check information.
5. The data transmission method according to claim 1, wherein the step of setting the spare module identification information as the main module identification information in step S103 includes:
and judging whether the standby module identification information is set to be valid information within set time, if so, setting the standby module identification information to be main module identification information, and if not, returning to the step S101.
6. The data transmission method according to claim 1, wherein the data transmission request message includes information of a current destination address bit and a current source address bit;
the step of determining whether the current response data packet corresponds to the data transmission request packet in step S103 includes: judging whether the destination address bit information in the current response data message is the source address bit information in the data transmission request message; and whether the source address bit information in the current response data message is the destination address bit information in the data transmission request message.
7. A data transmission system of a high-reliability PLC is characterized by comprising an iobus bus (13), a controller module (10) which can be configured on the iobus bus (13), a redundant main IO module (11) and a redundant standby IO module (12); the iobus bus (13) can transmit data messages; the redundant main IO module (11) and the redundant standby IO module (12) can acquire data from the iobus bus (13); the redundant main IO module (11) has main module identification information; the redundant standby IO module (12) is provided with standby module identification information;
the controller module (10) is configured to receive the data message after receiving a program data transmission interruption or remote data transmission interruption message; the controller module (10) generates a data transmission request message according to the identification information of the main module;
the controller module (10) is configured to send a data transmission request message to the redundant master IO module (11) through the iobus bus (13) according to the master module identification information of the redundant master IO module (11);
the redundant master IO module (11) is configured to receive the data transmission request message through the iobus (13), and the redundant master IO module (11) sends a response data message to the controller module (10) through the iobus (13);
the redundant IO module (12) monitors the iobus bus (13); after receiving the data transmission request message, the redundant standby IO module (12) judges whether a response data message which can be acquired from the iobus bus (13) corresponds to the data transmission request message, if so, the response data message is backed up locally, and if not, the standby module identification information is set as the main module identification information;
the controller module (10) is configured to send a data transmission request message to the redundant standby IO module (12) according to the main module identification information of the redundant standby IO module (12), and the redundant standby IO module (12) sends a response data message to the controller module (10) through the iobus bus (13).
8. The data transmission system according to claim 7, wherein the controller module (10) is further configured to determine whether the main module identification information or the auxiliary module identification information exists by the controller module (10), and if so, the controller module (10) sends a data transmission request message to the redundant main IO module (11) through the iobus bus (13) according to the main module identification information of the redundant main IO module (11).
9. The data transmission system according to claim 7, wherein the redundant master IO module (11) is further configured to determine, by the controller module (10), whether the master module identification information of the redundant master IO module (11) is valid data information, and if so, the redundant master IO module (11) receives the data transmission request message through the iobus bus (13); if not, returning to the configuration process of the controller module (10).
10. The data transfer system of claim 7, wherein the data transfer system further comprises the process of setting the spare module identification information as the master module identification information comprises:
and judging whether the standby module identification information is set to be valid information within set time, if so, setting the standby module identification information to be main module identification information, and if not, returning to the configuration process of the controller module (10).
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| CN100573382C (en) * | 2006-01-26 | 2009-12-23 | 中控科技集团有限公司 | Based on I 2The communication system of C and communication means |
| CN109656129A (en) * | 2019-03-05 | 2019-04-19 | 北京龙鼎源科技股份有限公司 | A kind of input/output module redundancy approach, apparatus and system |
| CN110095977B (en) * | 2019-04-29 | 2023-06-16 | 重庆川仪控制系统有限公司 | Redundancy device, master-slave module judging method, topology system and communication decision method |
| CN110515295A (en) * | 2019-07-25 | 2019-11-29 | 南京南瑞继保电气有限公司 | A kind of method of the redundancy I/O module of dynamic and configurable |
| CN110879565A (en) * | 2019-12-06 | 2020-03-13 | 北京和利时智能技术有限公司 | Dual-computer redundancy control system and redundancy control/fault monitoring method and device thereof |
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