OPC UA Server & MQTT Publisher Gateway for Modbus TCP Controllers

Access Modbus PLC Data & integrate data with OPC UA into higher level management systems

uaGate MB is a gateway for Modbus TCP controllers, for example from Schneider Electric, Wago, Beckhoff or Phoenix Contact. Many other manufacturers also offer Modbus TCP as an open communication interface. The gateway has an integrated OPC UA server for simple and secure data connection of new and existing systems to higher-level management systems, such as ERP, MES, or SCADA systems.

In addition, uaGate MB also offers MQTT Publisher functionality, enabling direct integration of PLC data into private or public IoT cloud applications on the IT side. The generic MQTT implementation supports the use of a large number of different cloud providers. Similar to the OPC UA standard, MQTT also supports various security mechanisms such as encrypted connections, certificates and user authentication, thus contributing to a high level of data security.

With this functionality, uaGate MB is a compact, secure, future-oriented, and proven gateway for data integration.

uaGate SI: OPC UA Server Gateway with MQTT Support for SIMATIC S7 Controllers
uaGate 840D: OPC UA Server Gateway for Siemens SINUMERIK 840D Controllers


Access to Data in Modbus PLCs from OPC UA Applications

  • Read and write access to Modbus controllers, e.g. from Schneider Electric, Wago, Beckhoff, Phoenix Contact, etc.
  • Integration of higher-level management systems like ERP, MES or SCADA using integrated OPC UA Server providing open, platform-independent, and market-proven communication
  • Easy local and global access to field data and routing through firewalls
  • Especially dedicated to retrofit upgrades, thus protecting former investments
  • No need for software updates, operating system patches and PC updates resulting in years of failure-free operation
  • Minimal PLC programming for register setup required
  • No dedicated PC required

PLC Project Data Available for Further Processing

  • Symbol import from user-edited text file
  • Easy setup of OPC UA Server requiring only a few steps for accessing data in Modbus PLCs
  • Web-based interface for gateway configuration

Industry-proven Security

  • Physically separated interfaces and separate configuration rights for OT and IT networks preventing intrusions
  • Supporting security standards as SSL/TLS and X.509 certificates
  • OPC UA compliant data encryption and user authentication
  • Security supported for MQTT communication with private and public clouds

Technical Data

uaGate MB    
Hardware Processor Altera Cyclone V SoC with Dual-core ARM Cortex-A9
  Connectors 2 x IEEE 802.3 100BASE-TX/10BASE-T (independent interfaces)
  Status LEDs PWR (power supply), RUN (running), ERR (error), SYS (configuration)
  Dimensions (H x W x D) 100 mm x 22.5 mm x 105 mm
  Power Supply 18 VDC ... 32 VDC, SELV/PELV supply mandatory
Typically 200 mA, maximum 1 A at switch-on
  Operating Temperature, Horizontal DIN Rail Installation -40 °C ... 50 °C (0 mm minimum distance)
-40 °C ... 55 °C (22.5 mm minimum distance)
  Operating Temperature, Vertical DIN Rail Installation -40 °C ... 35 °C (0 mm minimum distance)
-40 °C ... 40 °C (22.5 mm minimum distance)
  Storage Temperature -40 °C ... 85 °C
  Relative Humidity 10 % ... 90 %, non-condensing
  Weight About 0.2 kg
  Mounting DIN Rail (35 mm)
  Housing Phoenix Contact ME MAX
  Protection Class IP20
Software Protocols Modbus TCP, OPC UA (Server, up to 20,000 OPC UA Nodes), MQTT (Publisher, up to 1,000 topics)
  Supported Controllers Modbus TCP controllers, e.g. from Schneider Electric, Wago, Beckhoff, Phoenix Contact, etc.
Conformity Emission EC Directive 2004/108/EC “Electromagnetic Compatibility”, EN 55011, Group 1, Class A
EC Directive 2004/108/EC “Electromagnetic Compatibility”, EN 55022, Class A
EC Directive 2004/108/EC “Electromagnetic Compatibility”, EN 61000, Part 6-4
FCC CFR45, Part 15 Section 15.107 and 15.109 (Class A),
VCCI Class A Information Technology Equipment 2002
  Immunity EC Directive 2004/108/EC “Electromagnetic Compatibility”, EN 61000, Part 6-2
Certifications   CE, FCC, RoHS

Order Information

Scope of Delivery  
Hardware uaGate MB
Software Tool for configuration over integrated web interface
Documentation Quick Startup Guide (printed documentation)
Order Numbers  
GAA-YE-145133 uaGate MB

Softing Industrial


+49 89 456 56-340

Callback Service

USA, Canada and Mexico

+1 865 251-5252

Callback Service

France & Iberia

+33 6 82 24 66 62