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Connecting Modbus RTU to Industrial Edge for MQTT IoT Gateway

You can connect Modbus RTU devices to Industrial Edge to create an MQTT-based IoT gateway using several approaches. Here's a breakdown:

Key Components & Approach

1. Modbus RTU to TCP/IP Converter: Typically, you'll need a device to convert Modbus RTU (serial) to Modbus TCP. This could be a dedicated gateway or a protocol converter.
2. Industrial Edge Device: Utilize an Industrial Edge device (e.g., SIMATIC S7-1500 with Edge capabilities).
3. Edge Software: Deploy appropriate Edge software components. Siemens recommends using Edge Management and MQTT Broker.
4. Data Collection & Transformation: Employ Edge applications (Node-RED is a common choice) to read Modbus TCP data and transform it into MQTT messages.

Steps:

1. Connect the Modbus RTU device to the Modbus RTU to TCP/IP converter.
2. Connect the converter to the same network as the Industrial Edge device.
3. Configure the Edge device with the MQTT Broker.
4. Develop an Edge application (e.g., using Node-RED) to:
   • Read data from the Modbus TCP server (converter).
   • Map the Modbus data to MQTT topics.
   • Publish the data to the MQTT Broker.

Resources:

• Modbus TCP Communication with Industrial Edge
• Siemens Industrial Edge Apps