Modbus TCP Communication Security Solution

Abstract: Modbus TCP communication security solution information is provided to you by excellent flowmeter and flowmeter production and quotation manufacturers. Modbus was invented by Modicon in 1979 and is the world's first real bus protocol for industrial fields. In my country, Modbus has become the national standard GB/T19582-2008. Modbus protocol is a common language applied to electronic controllers. Through this agreement, control. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the Modbus TCP communication security solution article. Modbus was invented by Modicon in 1979 and is the world's first real bus protocol for industrial fields. In my country, Modbus has become the national standard GB/T19582-2008. Modbus protocol is a common language applied to electronic controllers. Through this protocol, controllers can communicate with each other, with other devices via a network (eg, Ethernet). It has become a common industry standard. 1. Overview SCADA, DCS, PCS, PLC and other industrial control systems are widely used in the fields of industry, energy, transportation, water conservancy and municipal administration to control the operation of production equipment. Once there is a loophole in the information security of the industrial control system, it will cause major hidden dangers to the operation of industrial production and national economic security. The Ministry of Industry and Information Technology [2011] No. 451 Circular clearly pointed out that there are still many problems in the information security management of industrial control systems in my country, mainly due to insufficient attention to the information security issues of industrial control systems, imperfect management systems, lack of relevant standards and specifications, and technical protection. The measures are not in place, and the security protection and emergency response capabilities are not high, which threatens the safety of industrial production and the normal operation of society. In this regard, all regions, departments and units must attach great importance to it, enhance risk awareness, responsibility awareness and sense of urgency, and effectively strengthen the information security management of industrial control systems. Using the Modbus protocol, control equipment produced by different manufacturers can be connected to an industrial network for centralized monitoring. This protocol defines a message structure that controllers recognize and use, regardless of the network over which they communicate. It describes the process of a controller requesting access to other devices, how to respond to requests from other devices, and how to detect and log errors. It establishes a common format for the format and content of message fields. When communicating on a Modbus network, this protocol determines that each controller needs to know their device address, recognize messages sent by address, and decide what action to take. If a response is required, the controller will generate a feedback message and send it out using the Modbus protocol. On other networks, messages containing the Modbus protocol are converted to the frame or packet structure used on this network. This transformation also extends the method of addressing node addresses, routing paths, and error detection according to the specific network. Modbus has the following characteristics: ●Standard and open, users can use the Modbus protocol for free and with confidence. At present, there are more than 400 manufacturers supporting Modbus, and more than 600 products supporting Modbus. ●Modbus can support a variety of electrical interfaces, such as RS-232, RS-485, etc., and can also be transmitted on various media, such as twisted pair, optical fiber, wireless, etc. ●The frame format of Modbus is simple, compact and easy to understand. It is easy for users to use and easy for manufacturers to develop. 2. Status Quo and Analysis The simple system network structure is shown in the figure above, which consists of three parts: information layer (Informationzone), operation station layer (Stationzone) and controller layer (Controllerzone). The communication between the controller layer and the operator station layer follows the Modbus protocol. The current status quo is that most running computers in the control network have little or no opportunity to have 24/7 virus protection or updated versions installed. Controllers are designed to optimize real-time I/O functions, but do not provide enhanced network connection security protection. and many control networks are“open”, There is no effective isolation between different subsystems. When a problem occurs at the operation station level and is attacked, the virus spreads rapidly through the network, affecting the equipment at the control level and causing huge losses to the factory. At present, in order to avoid major risks, petrochemical, water treatment and manufacturing industries basically comply with the requirements of the industry standard ANSI/ISA-99Standards for planning. ANSI/ISA-99 and North American Electric Reliability Council (NERC) CIP-005 both point out that process control systems or SCADA control networks should be isolated from other systems, including enterprise IT networks. The main points of control network security are as follows: It should be noted that the security requirements of commercial networks The security needs of the control network are quite different in some places. In terms of communication applications in the industrial field, gatekeepers and ordinary IT firewalls have certain limitations in function, which cannot realize security protection based on industrial control network requirements, and are not conducive to later maintenance. Therefore, do not try to put the control system into the IT solution. Only by choosing a proprietary control system firewall and a good control system security policy can provide efficient network attack defense capabilities for industrial control system security. Tofino is a cost-effective way to meet this security requirement. 3. Tofino solution This solution is mainly dedicated to solving the security problems of the control layer equipment that communicates with the Modbus protocol on site. 3.1 Highlights of the scheme Tofino can be used to separate the safety system network and the process system network to achieve physical isolation of critical systems and non-critical systems.

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