Modbus Protocol OPC Server

Main article: SCADA purpose of systems

The Modbus OPC Server provides OPC clients (such as the KRUG-2000 SCADA system) with access to devices that support the MODBUS protocol.

2025: Support for Domestic OS

Krug has released a cross-platform Modbus OPC server of the UA specification. The company announced this on February 24, 2025.

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Фото: Circle

Modbus is a standard protocol used industries in for transmission data between different devices. The protocol was widely used and in fact became the standard for many manufacturers of devices and controllers.

The updated version of the OPC server has incorporated the advantages of the previous version of the DA specification from KRUG and has a number of advantages:

• Cross-platform. Supports Windows and Russian operational systems, including Astra Linux, Red OS.
• High degree of safety.
• Data unification. 
• Support for real-time operation. 
• Continuity of previous versions.
• Emulates tag values.
• Monitoring tag values without an OPC client.
• Remote configuration.
• Great information power. A system with 250,000 tags can be built on the basis of one OPC server.

2016: Basic Features of Modbus OPC Server

Among the main functions of the Modbus OPC server for July 2016:

• Protocol support: MODBUS RTU, MODBUS TCP, MODBUS ASCII
• Support for MODBUS features: 1,2,3,4,5,6,15,16
• Communication channel support: COM port, TCP connection
• Possibility to use extended list of communication channel types (CSD, GPRS, etc.) using special software "Modem communication channel module"
• Ability to poll device tag groups at different intervals
• Interaction with OPC customers according to OPC DA version 2.05a
• Tag Grouping
• Import/Export configuration to CSV format (with report file generation)
• Ability to query and view tag values without an OPC client connection
• Ability to emulate tag values
• Logging of OPC server operation.

Automatically searching for connected devices reduces the time to physically connect devices to the computer and configure the OPC server.

The ability to import/export the configuration into CSV format (with the ability to further edit and process it in Excel) allows you to significantly speed up the configuration process.

The ability to poll device tag groups with different frequencies allows you to increase the speed of reading critical parameters by reducing the frequency of reading less important (or rarely changing) parameters.

The ability to query and view tag values without connecting an OPC client allows the initial configuration of the OPC server (setting parameter register numbers, etc.) without additional software, as well as to diagnose possible problems in the development of automated systems, allowing to separate errors at the SCADA system level from errors in polling devices.

Tag value emulation allows you to debug projects in top-level systems without physical access to metering devices, allows you to emulate critical values ​ ​ for emergency situations, and also makes it possible to easily create training projects for various purposes.

System requirements:

• Processor frequency - 1.4 GHz and above
• At least 256 MB of RAM
• Minimum 20MB of free hard disk space
• Presence of RS-232/RS-485 serial interface or interface converter (when using serial interface)
• Availability of Ethernet interface (when using TCP connection).

Supported operating systems: • x86: Windows XP, Windows 7, Windows 8

• x64: Windows 7, Windows 8, Windows Server 2012.

To familiarize yourself with the software product, you can use 30 tags for free without a time limit. To work with more than 30 tags, you can use the 30-day full-featured trial period.

The OPC server license can be supplied with a software or electronic (hardware) security key.