CN115842609B - Communication redundancy method for SIS system - Google Patents
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Abstract
The invention discloses a communication redundancy mechanism for an SIS system, which is used for realizing communication redundancy, wherein when one line fails, other lines can work normally, multi-network port redundancy is realized, the configuration can be flexibly carried out, under a certain redundancy mode, templates can be spanned, various redundancy residues are not influenced by each other, such as modbus TCP and RTU redundancy links are not influenced by each other, and respective communication links are managed respectively, so that the system has certain use value and popularization value.
Description
Technical Field
The invention relates to the technical field of computers, in particular to a communication redundancy method for an SIS system.
Background
With the continuous development of automation level, the automation degree of each industry is higher and higher, and the following industrial production line focuses more on the improvement of productivity and product quality, which makes the reliability of an automation system higher. Machines are generally required to work continuously on many large industrial production lines and cannot be stopped. But the controller with higher reliability can not achieve zero fault and does not stop running. For example, in the paper, chemical, petroleum, nuclear power plant industries, etc., there is a very high requirement for the reliability of certain systems, if the system fails, there is a great threat to both production and safety. Therefore, in many practical applications, one is increasingly focusing more on fault tolerance and reliability of the system. However, it has been difficult to improve the reliability of system hardware in a single sense to meet the demands of the system for high reliability.
The prior system has single universal redundancy function, is difficult to deal with when the condition is complex, and the communication template bears the work of external communication and generally provides various communication interfaces, thus determining that the architecture is relatively complex. The existing system has complex functions and is inconvenient for users.
In view of the foregoing, there is a need for a communication redundancy method for SIS systems that addresses the shortcomings of the prior art.
Disclosure of Invention
The invention provides a communication redundancy method for an SIS system, aiming at solving the problems.
In order to achieve the above purpose, the present invention provides the following technical solutions: a communication redundancy method for SIS system is disclosed, which features that a site is equipped with up to 4 communication templates, each with Ethernet, RS485 communication interface and 485/PPS communication interface, and said communication templates are used in the redundancy mode of system network communication,
step one, hardware configuration, wherein each SNet of the communication templates uses 2 network ports and is fixed on NetA and NetB,
the redundancy mode supported by SNet is 4 network ports, the 4 network ports are distributed on NetA and NetB of two communication templates,
in the default setting, redundant 4 network ports are configured on redundant slots, and the NetA and NetB of one communication template are used as main materials, and the NetA and NetB of the other communication template are used as standby materials;
if the redundant 4 network port configurations are not on the redundant slot positions, the network ports NetA and NetB of the two templates are both dominant;
step two, the main network ports NetA and NetB alternately transmit and receive SNet data, and the standby network ports only upload template state information and diagnosis information;
and thirdly, switching the main network port and the standby network port according to the fault degree of the clamping piece and the SNet network communication quality.
Optionally, in the third step, when the main and standby of the SNet network port are switched, the main and standby switching is performed according to the weight set by the fault, where the fault includes a CMBUS fault, a SNet fault and other faults of the manually defined template.
Optionally, the Modbus Tcp communication modes of the communication templates are all configured as redundancy modes, and 4 network ports of each communication template support the Modbus Tcp communication protocol.
Optionally, redundancy selection of the Modbus Tcp communication mode of the communication template is to select two network ports as redundant network ports at most, the Modbus Tcp redundancy working mode is to work simultaneously, and any two network ports in any communication template in the system are available for redundancy configuration;
if the Modbus Tcp communication mode of the communication template selects to be not configured with redundancy, the network port of each communication template independently supports the Modbus Tcp.
Optionally, when the current site is configured as a Modbus Tcp master station, the following steps are executed:
in the case of a redundant configuration, the same command is passed by both portals to perform data interactions,
when in a non-redundant configuration, a command selects a portal to perform data interaction,
the configuration method of the current site comprises the following steps:
creating a physical link: the method comprises the steps of including a communication card address, a network port number and a destination IP, and if redundancy is needed, configuring the redundant communication card address, the network port number and the destination IP address;
creating a command: according to Modbus protocol creation command, selecting physical link, selecting read/write address, and operating cycle;
the IP address of the self is automatically generated into an IP according to the IP of the slave station, communication is established with the other party, and the mode of generating the IP is comprehensively generated by configuration software.
Optionally, when the current site is configured as a Modbus Tcp slave, the following steps are executed,
as a slave station, as long as the network port enables the Modbus Tcp slave station, the configuration of the IP address of the read-write command slave station of the third party equipment is supported, and each network port supports 8 IP addresses at most.
Alternatively, when the current site is configured as a Modbus Rtu master site, the following steps are performed,
when the redundant configuration is adopted, the same command is processed by two network ports to interact data, the working modes of the two network ports are configured into two modes of simultaneous working or primary and backup working,
when in a non-redundant configuration, a command selects a portal to handle data interactions,
the configuration method of the current site includes the following steps,
creating a physical link: the method comprises the steps of configuring a redundant communication card address, a network port number, a target device address and a redundant working mode of a communication port if redundancy is needed;
creating a command: and according to the Modbus protocol creation command, selecting a physical link, selecting a read/write address and operating the cycle.
Optionally, when the redundant network ports are in the simultaneous working mode, the adaptive third party device is also provided with the redundant network ports, and when the two network ports work simultaneously, both network ports trigger the read-write command,
when the redundant network ports select a main and standby working mode, the adaptive third party equipment has only one network port, and when the redundant network ports are selected to work as the main and standby, the two network ports are on the same template;
the main/standby switching method in the main/standby mode is to perform state judgment according to the following manner, and perform subsequent operation according to the state judgment result,
when the main network port transmits data and normally receives the data, the standby network port does not transmit the data and monitors the data, judging that the main network port receives and transmits the data normally and the standby network port receives the data normally, and keeping the current state;
when the main network port transmits data and normally receives the data, the standby network port does not transmit the data and cannot monitor the data, judging that the main network port receives and transmits normally and the standby network port receives abnormally, and keeping the current state;
when the main network port sends data but does not receive the data, the standby network port does not send the data and monitors the data, judging that the receiving and sending of the main network port are abnormal and the receiving of the standby network port is normal, and switching the main network port and the standby network port;
when the main network port transmits data but does not receive data, the standby network port does not transmit data and does not monitor data, the main network port and the standby network port are judged to transmit and receive abnormity or no slave station is on line or the main network port transmits abnormity, and the main network port and the standby network port are switched.
Alternatively, when the current site is configured as a Modbus Rsu slave, the following steps are performed,
the Modbus Rtu slave station responds to the read-write operation of the third party device,
the configuration method of the current site includes the following steps,
creating a physical link: the method comprises the steps of configuring a redundant communication card address, a network port number and a slave device address if redundancy is needed, and configuring the redundant communication card address, the network port number and the redundant working mode to work simultaneously;
when the redundant configuration mode is two-to-two network ports, the slave device addresses are set to be the same;
when the network ports are two to one, the addresses of the slave devices are different.
In the invention, communication redundancy is realized, and when one line fails, other lines can work normally;
in the invention, multi-network port redundancy is realized, the configuration is flexible, and under a certain redundancy mode, templates can be crossed;
in the invention, various redundancy is not affected, such as modbus TCP and RTU redundancy links are not affected, and respective communication links are managed respectively, so that the method has certain use value and popularization value.
Drawings
Fig. 1 is a schematic structural view of a clip according to the present invention.
Fig. 2 is a schematic diagram of a Snet network port redundancy scheme according to the present invention.
Fig. 3 is a diagram illustrating an example of an application of the Snet portal redundancy of the present invention.
Fig. 4 is a diagram illustrating an example of an application of Modbus Tcp port redundancy in accordance with the present invention.
Fig. 5 is a diagram illustrating an example of an application of Modbus Rtu485 portal redundancy of the present invention.
Fig. 6 is a diagram illustrating an example of an application of port redundancy when Modbus Rtu of the present invention is used as a master station.
Fig. 7 is a diagram of a primary and a secondary operation modes of network port redundancy when the Modbus Rtu of the present invention is used as a primary station.
Fig. 8 is a schematic diagram of two-to-two connection of the network ports according to the present invention.
FIG. 9 is a schematic diagram of a two-to-one connection of the network ports according to the present invention
Detailed Description
As shown in the schematic diagram of the card structure in fig. 1, a communication redundancy method for SIS system, a site is configured with at most 4 communication templates, each communication template has four ethernet networks, two RS485 communication interfaces and one 485/PPS communication interface, the redundancy mode of communication template in system network communication includes the following steps,
step one, as shown in fig. 2, the hardware configuration, the SNet of each communication template uses 2 ports, and is fixed on NetA and NetB,
the redundancy mode supported by SNet is 4 network ports, and the 4 network ports are distributed on NetA and NetB of two communication templates; in the default setting, the redundant 4 network ports are configured on the redundant slot, the NetA and NetB of one communication template are mainly used, the NetA and NetB of the other communication template are prepared, if the redundant 4 network ports are not configured on the redundant slot, the NetA and NetB of the two templates are mainly used, and a specific application example of the Snet network port redundancy is shown in fig. 3;
step two, the main network ports NetA and NetB alternately transmit and receive SNet data, and the standby network ports only upload template state information and diagnosis information;
step three, according to the fault degree of the clamping piece and the communication quality of the SNet network, when the network port is switched between the main network port and the standby network port, the main network port and the standby network port are switched according to the weight set by the fault, the fault comprises a CMBUS fault, a SNet fault and other faults of a manually defined template, specifically, the CMBUS fault comprises a fault such as a CMBUS Link packet loss and a fault packet error, the SNet fault comprises a fault such as an Ethernet Link fault, a packet loss and a fault packet error, and because the CMBUS and the SNet are communication links which are important in the system, when one Link communication has the fault, the main network port and the standby network port are recommended to be switched by the SNet, namely, the weights of the two communication links are the same.
NetA and NetB can also be configured to support other communication services without the redundancy limitations of SNet.
The Modbus Tcp communication modes of the communication templates are all configured into redundancy modes, 4 network ports of each communication template support a Modbus Tcp communication protocol, the redundancy selection of the Modbus Tcp communication modes of the communication templates is that at most two network ports are selected as redundancy network ports, the Modbus Tcp redundancy working modes are simultaneous working, and any two network ports in any communication template in the system are alternatively configured into redundancy;
if the Modbus Tcp communication mode of the communication template selects to not configure redundancy, the network port of each communication template supports Modbus Tcp independently, as in the Modbus Tcp network port redundancy mode example shown in fig. 4.
When the current site is configured as a Modbus Tcp master station, the following steps are executed:
in the case of a redundant configuration, the same command is passed by both portals to perform data interactions,
when in a non-redundant configuration, a command selects a portal to perform data interaction,
the configuration method of the current site comprises the following steps:
creating a physical link: the method comprises the steps of including a communication card address, a network port number and a destination IP, and if redundancy is needed, configuring the redundant communication card address, the network port number and the destination IP address;
creating a command: according to Modbus protocol creation command, selecting physical link, selecting read/write address, and operating cycle;
the IP address of the self is automatically generated into an IP according to the IP of the slave station, communication is established with the other party, and the mode of generating the IP is comprehensively generated by configuration software.
Configured such that when the current site is configured as a Modbus Tcp slave, the following steps are performed,
as a slave station, as long as the network port enables the Modbus Tcp slave station, the configuration of the IP address of the read-write command slave station of the third party equipment is supported, and each network port supports 8 IP addresses at most.
Modbus Rtm may be configured in a redundant manner or a non-redundant manner, and the 3 ports of each communication template support Modbus Rtm. When the number 3 network port is configured as 485, modbus Rtm 485 redundancy manner example as shown in FIG. 5 may also be configured as redundancy.
When the current site is configured as a Modbus Rtu master, as in the example of the redundant simultaneous operation mode when Modbus Rtu is the master shown in fig. 6, the following steps are performed,
when the redundant configuration is adopted, the same command is processed by two network ports to interact data, the working modes of the two network ports are configured into two modes of simultaneous working or primary and backup working,
when in a non-redundant configuration, a command selects a portal to handle data interactions,
the configuration method of the current site includes the following steps,
creating a physical link: the method comprises the steps of configuring a redundant communication card address, a network port number and a target device address, and if redundancy is needed, configuring the redundant communication card address, the network port number, the target device address and a communication port redundancy working mode, wherein the redundant communication card address, the network port number, the target device address and the communication port redundancy working mode can work simultaneously or can work in a master-slave mode, and at most 64 links can be created;
creating a command: and according to the Modbus protocol creation command, selecting a physical link, selecting a read/write address, operating a cycle, and automatically generating an interaction variable.
When the redundant network ports are in the simultaneous working mode, the adaptive third party device is also provided with the redundant network ports, and when the two network ports work simultaneously, both network ports trigger read-write commands, see figure 6,
when the redundant network port selects the active and standby working modes, as shown in the redundant active and standby working mode example in fig. 7, the adaptive third party equipment has only one network port, and when the redundant network port is selected to work as active and standby, the two network ports are on the same template;
the main/standby switching method in the main/standby mode is to perform state judgment according to the following manner, and perform subsequent operation according to the state judgment result,
when the main network port transmits data and normally receives the data, the standby network port does not transmit the data and monitors the data, judging that the main network port receives and transmits the data normally and the standby network port receives the data normally, and keeping the current state;
when the main network port transmits data and normally receives the data, the standby network port does not transmit the data and cannot monitor the data, judging that the main network port receives and transmits normally and the standby network port receives abnormally, and keeping the current state;
when the main network port sends data but does not receive the data, the standby network port does not send the data and monitors the data, judging that the receiving and sending of the main network port are abnormal and the receiving of the standby network port is normal, and switching the main network port and the standby network port;
when the main network port transmits data but does not receive data, the standby network port does not transmit data and does not monitor data, the main network port and the standby network port are judged to transmit and receive abnormity or no slave station is on line or the main network port transmits abnormity, and the main network port and the standby network port are switched.
When the current site is configured as a Modbus Rtu slave, the following steps are performed,
the Modbus Rtu slave station responds to the read-write operation of the third party device,
the configuration method of the current site includes the following steps,
creating a physical link: the method comprises the steps of configuring the address of the redundant communication card, the network number and the address of the slave equipment, if redundancy is needed, configuring the address of the redundant communication card, the network number and the redundant working mode to work simultaneously, not supporting the primary and standby work, and creating 64 links at most;
when the redundant configuration mode is two-to-two network ports, the two network ports of the SIS are two network ports corresponding to the third party equipment, and the addresses of the slave equipment are the same as shown in an application example shown in FIG. 8;
when the two network ports are one to one, the SIS two network ports correspond to the third party device, and the application example shown in fig. 9 is seen, and the slave device addresses are different.
The communication template modbus TCP/RTU redundant interface can be used for binding one interface by one link, and then two links are selected to achieve the purpose of redundancy; the network protocol layer lwip of the communication template can be replaced by other rtos lwip, communication redundancy is realized through the clamping piece, when one line fails, other lines can work normally, multi-network port redundancy is realized, flexible configuration is realized, under a certain redundancy mode, templates can be crossed, various redundancy is not affected, such as modbus TCP and RTU redundancy links are not affected, and respective communication links are managed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A communication redundancy method for SIS system is characterized by that a site is equipped with at least 2 up to 4 communication templates, each communication template has Ethernet, RS485 communication interface and 485/PPS communication interface, the redundancy mode of communication of said communication template in system network includes the following steps,
step one, hardware configuration, wherein each SNet of the communication templates uses 2 network ports and is fixed on NetA and NetB,
the redundancy mode supported by SNet is 4 network ports, 4 network ports are distributed on the NetA and NetB of two communication templates, in the default setting, the redundant 4 network ports are configured on the redundancy slot, the NetA and NetB of one communication template are used as the main, the NetA and NetB of the other communication template are used as the standby,
if the redundant 4 network port configurations are not on the redundant slot positions, the network ports NetA and NetB of the two templates are both dominant;
step two, the main network ports NetA and NetB alternately transmit and receive SNet data, and the standby network ports only upload template state information and diagnosis information;
and thirdly, switching the main network port and the standby network port according to the fault degree of the clamping piece and the SNet network communication quality.
2. The communication redundancy method for SIS system according to claim 1, wherein in said step three, when the main and standby of the SNet network port are switched, the main and standby are switched according to the weight set by the fault, and said fault includes CMBUS fault, SNet fault and other faults of the manually defined templates.
3. The communication redundancy method for an SIS system according to claim 2, wherein when the Modbus Tcp communication modes of the communication templates are all configured as redundancy modes, the 4 ports of each communication template support the Modbus Tcp communication protocol.
4. The communication redundancy method for the SIS system according to claim 2, wherein redundancy selection of the Modbus Tcp communication mode of the communication template is that at most two network ports are selected as redundancy network ports, modbus Tcp redundancy operation mode is that the Modbus Tcp works simultaneously, and any two network ports in any communication template in the system are available for redundancy configuration;
if the Modbus Tcp communication mode of the communication template selects to be not configured with redundancy, the network port of each communication template independently supports the Modbus Tcp.
5. A communication redundancy method for an SIS system according to claim 1, wherein when the current site is configured as a Modbus Tcp master station, the following steps are performed:
in the case of a redundant configuration, the same command is passed by both portals to perform data interactions,
when in a non-redundant configuration, a command selects a portal to perform data interaction,
the configuration method of the current site comprises the following steps:
creating a physical link: the method comprises the steps of including a communication card address, a network port number and a destination IP, and if redundancy is needed, configuring the redundant communication card address, the network port number and the destination IP address;
creating a command: according to Modbus protocol creation command, selecting physical link, selecting read/write address, and operating cycle;
the IP address of the self is automatically generated into an IP according to the IP of the slave station, communication is established with the other party, and the mode of generating the IP is comprehensively generated by configuration software.
6. A communication redundancy method for an SIS system, as claimed in claim 5, wherein the step of performing the step of, when the current site is configured as a Modbus Tcp slave,
as a slave station, as long as the network port enables the Modbus Tcp slave station, the configuration of the IP address of the read-write command slave station of the third party equipment is supported, and each network port supports 8 IP addresses at most.
7. A communication redundancy method for an SIS system, as claimed in claim 1, wherein,
when the current site is configured as a Modbus Rtu master station, the following steps are performed,
when the redundant configuration is adopted, the same command is processed by two network ports to interact data, the working modes of the two network ports are configured into two modes of simultaneous working or primary and backup working,
when in a non-redundant configuration, a command selects a portal to handle data interactions,
the configuration method of the current site includes the following steps,
creating a physical link: the method comprises the steps of configuring a redundant communication card address, a network port number, a target device address and a redundant working mode of a communication port if redundancy is needed;
creating a command: and according to the Modbus protocol creation command, selecting a physical link, selecting a read/write address and operating the cycle.
8. A communication redundancy method for an SIS system, as claimed in claim 1, wherein,
when the redundant network ports are in the simultaneous working mode, the adaptive third party equipment is also provided with the redundant network ports, and when the redundant network ports work simultaneously, both network ports trigger read-write commands,
when the redundant network ports select a main and standby working mode, the adaptive third party equipment has only one network port, and when the redundant network ports are selected to work as the main and standby, the two network ports are on the same template;
the main/standby switching method in the main/standby mode is to perform state judgment according to the following manner, and perform subsequent operation according to the state judgment result,
when the main network port transmits data and normally receives the data, the standby network port does not transmit the data and monitors the data, judging that the main network port receives and transmits the data normally and the standby network port receives the data normally, and keeping the current state;
when the main network port transmits data and normally receives the data, the standby network port does not transmit the data and cannot monitor the data, judging that the main network port receives and transmits normally and the standby network port receives abnormally, and keeping the current state;
when the main network port sends data but does not receive the data, the standby network port does not send the data and monitors the data, judging that the receiving and sending of the main network port are abnormal and the receiving of the standby network port is normal, and switching the main network port and the standby network port;
when the main network port transmits data but does not receive data, the standby network port does not transmit data and does not monitor data, the main network port and the standby network port are judged to transmit and receive abnormity or no slave station is on line or the main network port transmits abnormity, and the main network port and the standby network port are switched.
9. A communication redundancy method for an SIS system, as claimed in claim 8,
when the current site is configured as a Modbus Rtu slave, the following steps are performed,
the Modbus Rtu slave station responds to the read-write operation of the third party device,
the configuration method of the current site includes the following steps,
creating a physical link: the method comprises the steps of configuring a redundant communication card address, a network port number and a slave device address if redundancy is needed, and configuring the redundant communication card address, the network port number and the redundant working mode to work simultaneously;
when the redundant configuration mode is two-to-two network ports, the slave device addresses are set to be the same;
when the network ports are two to one, the addresses of the slave devices are different.
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