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Modbus gateway is also called Ethernet communication gateway. It can realize the conversion between Modbus RTU/ASCII and Modbus TCP. Modbus protocols can classify into two types, one is RS485 based Modbus RTU(or ASCII), and the other is Ethernet-based Modbus TCP. Modbus gateway is a converter which can convert the data of Modbus RTU to the data of Modbus TCP. Due to the limitation of RS485 bus interface, Modbus TCP has the following advantages compared with RTU :(1) existing Ethernet network can be adopted, save the cost of wiring of RS485.(2) multiple hosts can be supported to access Modbus instruments simultaneously.
Functions of Modbus gateway
Modbus gateway is a network hub communication protocol conversion device of the industrial automation system. It connects with the intelligent instrument, collects the data of inferior instrument to Modbus gateway, connects with the superior computer network, and communicates with network computer according to Modbus TCP protocol. Modbus gateway has two types: storage type and ordinary type. Compared with ordinary Modbus, storage Modbus can store the contents of registers read in the gateway. In this way, the speed of Modbus TCP query can be greatly improved and the performance is superior when supporting multi-host access.
Modbus has the following characteristics
1. Standard, open, users can use Modbus protocol without paying the license fee or infringing intellectual property rights. At present, there are more than 400 manufacturers supporting Modbus and over 600 products supporting Modbus. 2. Modbus can support a variety of electrical interfaces, such as RS232, RS485, etc., and can be transmitted on various media, such as twisted pair, optical fiber, wireless, etc. 3. 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.
Functions and Applications of Modbus Gateway
Protocol Conversion: The Modbus gateway converts the Modbus protocol into other communication protocols or vice versa. This enables devices with different protocols to communicate with each other, achieving data interconnectivity. In fields such as industrial automation, building automation, and remote monitoring, the Modbus gateway plays a crucial role.
Data Aggregation: The Modbus gateway collects data from multiple Modbus devices and performs aggregation processing. It can send the data collected from different devices to a central system or cloud platform in a unified format, enabling centralized management and analysis of data. This functionality allows administrators to monitor and manage devices more conveniently, improving work efficiency.
Security and Access Control: The Modbus gateway provides functions such as secure authentication, data encryption, and access control to protect the Modbus network from unauthorized access and network threats. This provides a more secure and reliable IIoT solution for traditional industries.
Remote Configuration and Management: The Modbus gateway typically provides a remote access interface, allowing administrators to remotely configure, upgrade firmware, troubleshoot, and perform other operations on the gateway itself and the connected Modbus devices. This remote management approach reduces operational costs and improves device availability and reliability.
Application Cases of Modbus Gateway in Traditional Industries
Industrial Automation Control System: In industrial automation control systems, the Modbus gateway connects PLCs, DCSs, SCADA, and other control systems with Modbus devices, enabling real-time data collection and monitoring. This helps improve production efficiency, reduce energy consumption, and minimize downtime.
Smart Power Monitoring: In the power industry, the Modbus gateway monitors the operating status of power equipment (such as voltage, current, power, etc.) for remote monitoring and management. This facilitates timely detection of equipment failures, improving the operational efficiency and safety of power equipment.
Environmental Monitoring System: In the environmental protection field, the Modbus gateway connects with various sensors to monitor environmental parameters such as water quality, weather conditions, and soil moisture. This enables environmental protection departments to grasp environmental conditions in a timely manner and formulate targeted governance measures.
As a bridge connecting traditional devices to the Industrial Internet of Things, the Modbus gateway brings unprecedented transformation opportunities to traditional industries. With its unique functions and advantages, the Modbus gateway not only solves the communication problem between devices with different protocols, but also improves data processing capabilities and security. In the future, with the continuous development of the Industrial Internet of Things, the Modbus gateway will play an increasingly important role in more fields, driving traditional industries towards digitization and intelligence.
Industrial loT Gateways Ranked First in China by Online Sales for Seven Consecutive Years **Data from China's Industrial IoT Gateways Market Research in 2023 by Frost & Sullivan
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