Modbus TCP communications security solutions

Abstract: the Modbus TCP communications security solution information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Modbus is by Modicon invented in 1979, is the world * is used for industrial field bus protocol. In our country, the Modbus has become the national standard GB/T19582 - 2008. Modbus protocol is applied to the electronic controller on a common language. Controlled by this agreement. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the Modbus TCP communications security solution article details. Modbus is by Modicon invented in 1979, is the world * is used for industrial field bus protocol. In our country, the Modbus has become the national standard GB/T19582 - 2008. Modbus protocol is applied to the electronic controller on a common language. Through this agreement, between the controller and the controller via the network ( Such as Ethernet) And can communicate with other devices. It has become a general industry standards. 1, an overview of the SCADA, DCS, PCS, PLC and other industrial control system is widely used in industry, energy, traffic, water conservancy, municipal and other fields, is used to control the operation of production equipment. Once the information security hole in the industrial control system, industrial production and national economic security will cause significant hidden danger. Ministry of industry association [ 2011] Notice 451 made clear that China's industrial control system there are still some problems in the management of information security, information security problem is mainly to industrial control system seriously insufficient, imperfect management system, lack of related standards and technical protection measures were in place, safety protection and emergency disposal ability is not high, threatening industrial production safety and social functioning. To this, all localities and departments and units must attach great importance to and strengthen the risk awareness, responsibility awareness and sense of urgency, strengthen the management of industrial control system of information security. Using the Modbus protocol, control equipment of different manufacturers can be associated with industrial network, centralized monitoring. This protocol defines a controller can know the message structure used, regardless of what they are after a network to communicate. It describes a controller to request access to other equipment, the process of how to respond to a request from the other devices, and how to detect errors and record. It established the message domain pattern and content of common format. When on a Modbus network communication, this agreement determines each controller need to know their device address, recognition according to the address from the message, deciding what action to produce. If you need to respond, the controller will generate feedback information by using the Modbus protocol. On other networks, including the news of the Modbus protocol conversion for use on the network frame or package structure. This conversion also expanded the section according to the specific network address address, routing path and error detection methods. Modbus has the following characteristics: low standard, open, the user can free, safe to use the Modbus protocol. At present, the support of the Modbus manufacturers more than 400, in support of the Modbus more than 600 kinds of products. Modbus can support a variety of electrical interface, such as RS - 232、RS- 485, etc. , can also be transmitted on a variety of media, such as twisted-pair cable, optical fiber, wireless, etc. Modbus frame format is simple, compact, easy to understand. Development of simple user using easily, the manufacturer. 2, the present situation and the analysis of simple network structure as shown in the above system, by the information layer ( Informationzone) , operating station layer ( Stationzone) And the controller layer ( Controllerzone) Composed of three parts. The controller layer and layer between the operation station communications follow the Modbus protocol. The present situation is most control in the operation of the computer in the network, with little or no chance to install all-weather virus protection or an updated version. Controller design is to optimize the I/O functions of real time is given priority to, and does not provide to strengthen network security protection function. And many control network are & other; Open & throughout; , no effective isolation between different subsystems, problems after being attacked when operating level, the virus is spreading rapidly through the network, affect the control layer equipment, for the factory bring huge losses. At present, the petroleum chemical industry, water treatment and manufacturing in order to avoid big risk, such as basic comply with ANSI/ISA - industry standard 99 standards requirements planning. ANSI/ISA- 99年及NorthAmericanElectricReliabilityCouncil ( NERC） CIP - 005, points out that the process control system or SCADA control network should be isolated from other systems, including enterprise IT network, control key points are as follows: network security is important to note that the security requirements of the commercial network and control network security requirements in some places is completely different. In terms of industrial applications of communication, network gateway firewall and average IT there are some limitations on the function, can not be achieved based on the requirements of industrial control network security protection, and not conducive to later period maintenance. So don't try to control system to be included in the IT solutions, choose a proprietary control system combined with firewall security policy can be a good control system of industrial control system security to provide efficient network attack defense capabilities. Want to meet the safety requirements, Tofino is an economic and efficient way. 3, Tofino solutions focused on solving the scheme to the Modbus protocol communication control layer of equipment safety.

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