OPC UA Server & MQTT Publisher Gateway for SIMATIC S7 Controllers

Access Siemens PLC Data & integrate data with OPC UA in higher level management systems

uaGate SI makes data integration easier than ever before. The gateway supports the connection of SIMATIC S7-300, S7-400, S7-1200 and S7-1500 controllers from Siemens and uses the OPC UA standard for a simple and secure data integration of new and existing plants in higher-level management systems, such as ERP, MES, or SCADA systems.

In addition, uaGate SI 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 SI is a compact, secure, future-oriented, and proven gateway for data integration.

uaGate 840D: OPC UA Server Gateway for Siemens SINUMERIK 840D Controllers
uaGate MB: OPC UA Server Gateway with MQTT Support for Modbus TCP Controllers


Access to Siemens PLC Data from OPC UA Applications

  • Read and write access to SIMATIC S7-300, S7-400, S7-1200, and S7-1500 controllers
  • Support of optimized data blocks in SIMATIC S7-1200 and S7-1500 controllers
  • Allow secure S7-1200 and S7-1500 communication with TLS Protocol.
  • 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
  • No PLC programming or dedicated PC required

Optimized for Siemens Integration

  • Symbolic names import from Siemens TIA Portal and SIMATIC STEP 7 projects
  • Namespace configuration by browsing of SIMATIC S7 1200/1500 variables
  • Easy setup of OPC UA Server requiring only a few steps for accessing Siemens PLC data
  • Web 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 SI    
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 SIMATIC S7, OPC UA (Server, up to 20,000 OPC UA Nodes), MQTT (Publisher, up to 1,000 topics)
  Supported Controllers Siemens SIMATIC S7-300/400, SIMATIC S7-1200/1500 (including optimized block access),
Siemens-compatible controllers like VIPA controllers
  Supported Engineering Tools SIMATIC STEP 7, TIA-Portal V13/V14/V15/V16/V17/V18/V19, including Service Packs
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 SI
Software Tool for configuration over integrated web interface
Documentation Quick Startup Guide (printed documentation)
Order Numbers  
GAA-DX-145111 uaGate SI
Additional Products and Services  
GPA-CS-041000 NETLink S7-Compact (PROFIBUS/MPI to Ethernet adapter for communication with S7-300/-400 PLCs)


How To configure uaGate SI with Simatic S7 controller and optimized access

How to connect uaGate SIwith an OPC UA Client

How To configure uaGate SI with Siemens SIMATIC S7 controller

How-To connect uaGate SI with a MQTT Broker


Softing Industrial


+49 89 456 56-340

Callback Service

USA, Canada and Mexico

+1 865 251-5252

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France & Iberia

+33 6 82 24 66 62