CN115865560A - A Method Supporting Upgrading PLCs Across Network Segments - Google Patents
A Method Supporting Upgrading PLCs Across Network SegmentsDownload PDFInfo
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Abstract
Description
Translated fromChinese技术领域technical field
本申请涉及可编程控制器技术领域，特别涉及一种支持跨网段升级PLC的方法。The application relates to the technical field of programmable controllers, in particular to a method for supporting cross-segment PLC upgrades.
背景技术Background technique
随着以太网的发展和普及，在开发和升级PLC(可编程逻辑控制器)程序时，电脑编程软件和PLC之间也越来越多地使用以太网连接的方式，相对于传统的USB、RS232、RS485等连接方案，以太网连接方式更方便灵活。With the development and popularization of Ethernet, when developing and upgrading PLC (programmable logic controller) programs, more and more Ethernet connections are used between computer programming software and PLC. Compared with traditional USB, RS232, RS485 and other connection schemes, Ethernet connection is more convenient and flexible.
目前市面上，电脑编程软件和PLC都是在以太网直连或者HUB模式下连接的，IP地址需在同一网段，无法跨三层网络。在实际应用场景中，很多设备部署在不同网段的网络中，如果需要在不同网段内给PLC升级，十分不便。目前如果需要跨三层网络远程升级PLC上的程序，需要在电脑和PLC两端增加支持EOIP隧道的路由器或网关，通过配置EOIP隧道，来升级PLC。EOIP(Ethernet over IP，基于IP的以太网络隧道)隧道是一种二层隧道技术。现有EOIP技术建立的隧道的方法为在PC端和PLC之间设置两个路由器，在路由器上创建一个EOIP隧道，绑定WAN口到该隧道上，配置对端WAN口的IP地址为隧道远端IP，通过这个方案解决远程升级PLC时，需要增加2台支持EOIP的路由器，如果每个PLC侧去部署一台EOIP路由器，一方面大大增加了项目成本，另外也给运维人员带来了不便。Currently on the market, computer programming software and PLC are connected in Ethernet direct connection or HUB mode, and the IP addresses need to be on the same network segment, which cannot cross the three-layer network. In actual application scenarios, many devices are deployed in different network segments. It is very inconvenient to upgrade PLCs in different network segments. At present, if you need to remotely upgrade the program on the PLC across the three-tier network, you need to add a router or gateway that supports EOIP tunnels at both ends of the computer and the PLC, and upgrade the PLC by configuring the EOIP tunnel. EOIP (Ethernet over IP, IP-based Ethernet tunnel) tunnel is a layer-2 tunnel technology. The tunnel method established by the existing EOIP technology is to set up two routers between the PC end and the PLC, create an EOIP tunnel on the router, bind the WAN port to the tunnel, and configure the IP address of the WAN port at the opposite end as the remote port of the tunnel. When using this solution to remotely upgrade the PLC, it is necessary to add two routers that support EOIP. If each PLC side deploys an EOIP router, on the one hand, the project cost will be greatly increased, and the operation and maintenance personnel will also be brought inconvenient.
发明内容Contents of the invention
本发明是为了克服上述缺点，本发明提供一种支持跨网段升级PLC的方法，通过配置组态软件和PLC上的EOIP隧道使能，就能在跨网段的情况下，搭建出EOIP隧道，方便跨网段升级PLC程序。The present invention is to overcome the above-mentioned shortcoming, and the present invention provides a kind of method that supports upgrading PLC across network segments, by configuring configuration software and enabling EOIP tunnels on the PLC, EOIP tunnels can be built in the case of crossing network segments , to facilitate the upgrade of PLC programs across network segments.
为实现上述目的，本发明采用以下技术方案：一种支持跨网段升级PLC的方法，包括：所述PC端在安装组态编程软件时，创建一个虚拟TAP网口，配置私有IP地址A，用于和PLC设备的通讯协议连接；In order to achieve the above object, the present invention adopts the following technical solutions: a method for supporting cross-network segment upgrade PLC, comprising: when the PC end installs the configuration programming software, creates a virtual TAP network port, configures the private IP address A, It is used to connect with the communication protocol of PLC equipment;
所述PLC设备在系统启动时，创建一个虚拟内部网口，配置私有IP地址B，用于和PC端的通讯协议连接；When the system starts, the PLC device creates a virtual internal network port, configures a private IP address B, and is used to connect with the communication protocol of the PC end;
所述PC端和PLC设备外部物理网口分别配置一个设备管理IP地址C和D；所述设备管理IP地址C和D跨网段；The external physical network ports of the PC end and the PLC device are respectively configured with a device management IP address C and D; the device management IP addresses C and D span network segments;
当需要跨网段升级PLC程序时，PC端和PLC设备通过设备管理IP地址C和D创建EOIP隧道连接；When the PLC program needs to be upgraded across network segments, the PC and the PLC device create an EOIP tunnel connection through the device management IP addresses C and D;
判断PC端的目的IP是否为PLC设备的私有IP地址B，若是，则在PC端所发送报文打上EOIP头，再封装到设备管理网段的IP报文中；Determine whether the destination IP of the PC is the private IP address B of the PLC device, if so, add an EOIP header to the message sent by the PC, and then encapsulate it into the IP message of the device management network segment;
所述IP报文进入EOIP隧道发往PLC设备；The IP message enters the EOIP tunnel and is sent to the PLC device;
所述PLC设备在收到EOIP隧道报文后，剥离EOIP报文头，取出报文净荷,得到PC端组态编程软件发送的原始报文；After receiving the EOIP tunnel message, the PLC device strips the EOIP message header, takes out the message payload, and obtains the original message sent by the PC-side configuration programming software;
所述PLC设备根据原始报文进行程序升级。The PLC device performs program upgrade according to the original message.
作为优选，在创建EOIP隧道之前对该组报文的源IP地址与传输该隧道报文的EOIP隧道的源IP地址是否相同进行检测，并仅对源IP地址与传输该隧道报文的EOIP隧道的源IP地址不同的报文进行发送。Preferably, before creating the EOIP tunnel, it is detected whether the source IP address of the group message is the same as the source IP address of the EOIP tunnel that transmits the tunnel message, and only the source IP address and the EOIP tunnel that transmits the tunnel message send packets with different source IP addresses.
作为优选，所述IP报文进入EOIP隧道发往PLC设备的过程包括：As preferably, the process that the IP message enters the EOIP tunnel and is sent to the PLC device includes:
步骤101，询问是否需要EOIP隧道对IP报文进行转发，若需要转发，则进行下一阶段操作，若不需要，则返回链路层继续处理；Step 101, inquire whether the EOIP tunnel is needed to forward the IP message, if forwarding is required, then proceed to the next stage of operation, if not, then return to the link layer to continue processing;
步骤102，查询EOIP隧道能否使能，若是，则转至下一步，若否，则返回链路层继续处理；Step 102, query whether the EOIP tunnel can be enabled, if so, then go to the next step, if not, then return to the link layer to continue processing;
步骤103，询问是否广播，若是，则IP报文进入EOIP隧道，若否，则查询所述报文目的MAC地址是否为EOIP隧道接口MAC地址，若地址正确，则转至下一步，若否，则返回协议栈继续处理；Step 103, ask whether to broadcast, if so, then IP message enters EOIP tunnel, if not, then inquire whether described message destination MAC address is EOIP tunnel interface MAC address, if address is correct, then go to the next step, if not, Then return to the protocol stack to continue processing;
步骤104，IP报文在EOIP隧道，以隧道远端IP为目的IP查找路由表，若查找成功，则复制该报文，重置IP报文头传输层协议；出路由后，转发该IP报文；若查找失败，则丢弃该IP报文。Step 104, the IP message is in the EOIP tunnel, and the remote IP of the tunnel is used as the destination IP to search the routing table, if the search is successful, the message is copied, and the IP message header transport layer protocol is reset; after routing, forward the IP message If the search fails, the IP packet is discarded.
因此，本发明具有如下有益效果：本发明提出了一种在PC端组态软件和PLC设备之间建立EOIP隧道实现远程升级的方法，通过配置EOIP隧道使能后，就能在跨网段的情况下，搭建出EOIP隧道，本发明中方法不需要借助于EOIP路由器，方便跨网段升级PLC程序。与传统方案不同，降低了人工成本和维修成本。本发明利用EOIP技术与PLC远程升级相结合，IP报文在以太网即被转发，实现了PC端虚拟网口和PLC虚拟网口由EOIP隧道进行L2的直接转发，免去了两个路由器之间L3的转发。Therefore, the present invention has the following beneficial effects: the present invention proposes a method for establishing an EOIP tunnel between the PC-side configuration software and the PLC device to realize remote upgrade. After enabling the configuration of the EOIP tunnel, the Under the circumstances, set up EOIP tunnel, the method in the present invention does not need to rely on EOIP router, facilitates cross-network segment upgrade PLC program. Unlike traditional solutions, labor costs and maintenance costs are reduced. The present invention combines EOIP technology with PLC remote upgrade, and the IP message is forwarded on the Ethernet, which realizes the direct L2 forwarding of the PC-side virtual network port and the PLC virtual network port through the EOIP tunnel, eliminating the need for two routers. Inter-L3 forwarding.
附图说明Description of drawings
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例一起用于解释本发明，并不构成对本发明的限制。在附图中：The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are used together with the embodiments of the present invention to explain the present invention, and do not constitute a limitation to the present invention. In the attached picture:
图1为发明的一种支持跨网段升级PLC的方法的步骤流程图。FIG. 1 is a flow chart of the steps of an invented method for supporting PLC upgrade across network segments.
图2为本发明PLC系统建立隧道的连接示意图。Fig. 2 is a schematic diagram of the connection of the tunnel established by the PLC system of the present invention.
图3为本发明报文进入L2隧道后发往PLC的步骤流程图。Fig. 3 is a flow chart of the steps of sending the message to PLC after the message enters the L2 tunnel according to the present invention.
图4为本发明L2隧道的封装报文图。FIG. 4 is a diagram of encapsulated packets of an L2 tunnel in the present invention.
具体实施方式Detailed ways
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
一种支持跨网段升级PLC的方法，如图1所示，包括：A method for supporting upgrading PLCs across network segments, as shown in Figure 1, includes:
S1,所述PC端在安装组态编程软件时，创建一个虚拟TAP网口，配置私有IP地址A，用于和PLC设备的通讯协议连接；所述PLC设备在系统启动时，创建一个虚拟内部网口，配置私有IP地址B，用于和PC端组态编程软件的通讯连接。私有IP地址用于电脑组态软件和PLC之间的二层协议交互和厂家私有协议管理。示例性的，以私有IP地址A 192.168.20.2，私有IP地址B192.168.20.3为例。S1, when the PC end installs the configuration programming software, it creates a virtual TAP network port, configures a private IP address A, and is used to connect with the communication protocol of the PLC device; when the PLC device starts the system, it creates a virtual internal The network port is configured with a private IP address B, which is used for communication connection with the configuration and programming software on the PC side. The private IP address is used for the two-layer protocol interaction between the computer configuration software and the PLC and the manufacturer's private protocol management. Exemplarily, private IP address A 192.168.20.2 and private IP address B 192.168.20.3 are taken as an example.
S2,PC端和PLC设备外部物理网口分别配置一个设备管理IP地址；其中，两个设备管理IP可以跨网段。示例性的，以PC端的设备管理IP 10.1.1.1和PLC设备的设备管理IP20.1.1.1为例。S2, configure a device management IP address on the PC side and the external physical network port of the PLC device respectively; among them, the two device management IP addresses can cross network segments. Exemplarily, the device management IP 10.1.1.1 of the PC and the device management IP 20.1.1.1 of the PLC device are taken as examples.
S3,当需要跨网段升级PLC程序时，PC端和PLC设备通过设备管理IP创建EOIP隧道连接，如图2所示。S3, when the PLC program needs to be upgraded across network segments, the PC and the PLC device create an EOIP tunnel connection through the device management IP, as shown in Figure 2.
在创建EOIP隧道之前对该组报文的源IP地址与传输该隧道报文的EOIP隧道的源IP地址是否相同进行检测，并仅对源IP地址与传输该隧道报文的EOIP隧道的源IP地址不同的报文进行发送。具体地，当需要跨网段升级PLC程序时，电脑PC编程软件需要和PLC建立连接时，先通过10.1.1.1和20.1.1.1两个设备管理IP创建EOIP隧道连接。Before creating an EOIP tunnel, check whether the source IP address of the group of packets is the same as the source IP address of the EOIP tunnel that transmits the tunnel packets, and only check the source IP address and the source IP of the EOIP tunnel that transmits the tunnel packets Send packets with different addresses. Specifically, when the PLC program needs to be upgraded across network segments, when the computer PC programming software needs to establish a connection with the PLC, first create an EOIP tunnel connection through the two device management IPs of 10.1.1.1 and 20.1.1.1.
在创建EOIP隧道后，创建一个相应的路由条目。After creating the EOIP tunnel, create a corresponding routing entry.
S4,判断PC端的目的IP是否为PLC设备的私有IP地址，若是，即当电脑PC端的目的IP是PLC设备上的192.168.20.3时，则在PC端所发送报文打上EOIP头，再封装到设备管理网段的IP报文中；所述IP报文进入EOIP隧道发往PLC设备。S4, determine whether the destination IP of the PC end is the private IP address of the PLC device, if so, that is, when the destination IP of the computer PC end is 192.168. In the IP message of the device management network segment; the IP message enters the EOIP tunnel and sends it to the PLC device.
EOIP模块主要包括两方面，一个是EOIP网络设备对EOIP报文的隧道转发，另一个是EOIP接收主机对于EOIP报文的接收处理；其中：The EOIP module mainly includes two aspects, one is the tunnel forwarding of the EOIP message by the EOIP network device, and the other is the receiving and processing of the EOIP message by the EOIP receiving host; among them:
发送流程包括：对于待发送的报文，只有待发送的报文的目的MAC不是该局域网内的端口MAC时，才进入EOIP隧道进行转发；而对于进入EOIP隧道的以太网报文，按照RFC3378封装，封装后目的IP为隧道远端IP，按照路由查找相应出口转发。The sending process includes: for the message to be sent, only when the destination MAC of the message to be sent is not the port MAC in the LAN, it will enter the EOIP tunnel for forwarding; and for the Ethernet message entering the EOIP tunnel, it will be encapsulated according to RFC3378 , after encapsulation, the destination IP is the remote IP of the tunnel, and the corresponding egress is forwarded according to the routing.
接收流程包括：远端侧根据IP报文类型，识别EOIP，剥去外层IP头，依据源IP查找对应的EOIP隧道，从隧道对应的接口发送。The receiving process includes: the remote side identifies EOIP according to the type of IP packet, strips the outer IP header, searches for the corresponding EOIP tunnel according to the source IP, and sends it from the interface corresponding to the tunnel.
IP报文进入EOIP隧道发往PLC设备的过程，如图3所示，包括：The process of the IP message entering the EOIP tunnel and sending it to the PLC device, as shown in Figure 3, includes:
步骤101，询问是否需要EOIP隧道对IP报文进行转发，若需要转发，则进行下一阶段操作，若不需要，则返回链路层继续处理；Step 101, inquire whether the EOIP tunnel is needed to forward the IP message, if forwarding is required, then proceed to the next stage of operation, if not, then return to the link layer to continue processing;
步骤102，查询EOIP隧道能否使能，若是，则转至下一步，若否，则返回链路层继续处理；Step 102, query whether the EOIP tunnel can be enabled, if so, then go to the next step, if not, then return to the link layer to continue processing;
步骤103，询问是否广播，若是，则IP报文进入EOIP隧道，若否，则查询所述报文目的MAC地址是否为EOIP隧道接口MAC地址，若地址正确，则转至下一步，若否，则返回协议栈继续处理；Step 103, ask whether to broadcast, if so, then IP message enters EOIP tunnel, if not, then inquire whether described message destination MAC address is EOIP tunnel interface MAC address, if address is correct, then go to the next step, if not, Then return to the protocol stack to continue processing;
步骤104，IP报文在EOIP隧道，以隧道远端IP为目的IP查找路由表，若查找成功，则复制该报文，重置IP报文头传输层协议；出路由后，转发该IP报文；若查找失败，则丢弃该IP报文。Step 104, the IP message is in the EOIP tunnel, and the remote IP of the tunnel is used as the destination IP to search the routing table, if the search is successful, the message is copied, and the IP message header transport layer protocol is reset; after routing, forward the IP message If the search fails, the IP packet is discarded.
S5,IP报文在EOIP隧道，以隧道远端IP为目的IP查找路由表，若查找成功，则复制该报文，重置IP报文头传输层协议；出路由后，转发该IP报文；若查找失败，则丢弃该IP报文。S5, the IP message is in the EOIP tunnel, and the remote IP of the tunnel is used as the destination IP to search the routing table. If the search is successful, the message is copied, and the transport layer protocol of the IP message header is reset; after the route is out, the IP message is forwarded ; If the search fails, the IP packet is discarded.
S6，PLC设备在收到EOIP隧道报文后，剥离EOIP报文头，取出报文净荷,得到PC端组态编程软件发送的原始报文；其中，原始报文即为PLC升级所需的程序内容。EOIP协议在初始化时被注册进内核，该协议的处理函数为EOIP_rcv，对于EOIP网络设备，它的EOIP_rcv的功能依然是转发，典型就是转发隧道两端的keepalive报文，只有EOIP隧道的接收主机的EOIP_rcv才会实际收取EOIP报文中的净荷。S6, after the PLC device receives the EOIP tunnel message, it strips the EOIP message header, takes out the message payload, and obtains the original message sent by the PC-side configuration programming software; wherein, the original message is required for PLC upgrade program content. The EOIP protocol is registered into the kernel when it is initialized. The processing function of this protocol is EOIP_rcv. For EOIP network devices, its function of EOIP_rcv is still forwarding. Typically, it forwards keepalive messages at both ends of the tunnel. Only the EOIP_rcv of the receiving host of the EOIP tunnel Only then will the payload in the EOIP message be actually received.
S7，所述PLC设备根据原始报文进行程序升级。S7. The PLC device performs program upgrade according to the original message.
如图4为本发明EOIP隧道的封装报文图，EOIP隧道报文头采用EOIP头，源MAC为PC端的MAC，目的MAC采用PLC的MAC或者采用步骤105中广播MAC，DATA为类型是EOIP报文的净荷。Figure 4 is the encapsulation message diagram of the EOIP tunnel of the present invention, the EOIP tunnel message head adopts the EOIP head, and the source MAC is the MAC of the PC end, and the MAC of the destination MAC adopts the MAC of the PLC or adopts the broadcast MAC in step 105, and DATA is that the type is the EOIP report The payload of the text.
采用上述方法实现的PLC系统，在跨以太网升级方面，可以通过EOIP隧道的配置，快速搭建电脑编程软件和PLC的之间的二层以太网隧道，不再受三层网络的限制。方案实现成本低，不需要借助于路由器等硬件设备，具有较好的推广应用价值。The PLC system implemented by the above method can quickly build a layer-2 Ethernet tunnel between the computer programming software and the PLC through the configuration of the EOIP tunnel in terms of cross-Ethernet upgrade, and is no longer limited by the layer-3 network. The implementation cost of the scheme is low, and no hardware devices such as routers are needed, so it has good popularization and application value.
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.
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