DeviceNet to PROFINET Gateway for Siemens PLC Integration
In modern smart manufacturing, integrating legacy DeviceNet sensors into a PROFINET-based control system is a common challenge. This article explores a practical solution using a protocol conversion gateway, with a real-world example of connecting an ifm FDB002 pressure sensor to a Siemens S7-1200 PLC.
The Integration Challenge: DeviceNet Meets PROFINET
Many factories upgrading to Industry 4.0 face a frustrating roadblock: critical field devices still use older industrial networks like DeviceNet, while the main control system runs on high-speed PROFINET. A typical scenario is a large appliance manufacturer’s smart painting line. The core automation relies on a Siemens S7-1200 PLC and PROFINET architecture to orchestrate robotic sprayers, conveyor chains, and valve actuators. To precisely monitor atomization pressure in spray booths and hydraulic supply stability, the plant installed high-accuracy ifm FDB002 pressure sensors. However, these sensors natively communicate via DeviceNet, creating a direct incompatibility with the PROFINET network.
Before implementing a solution, the project team faced several pain points:
- Protocol Barrier: The PLC’s PROFINET network and the sensor’s DeviceNet protocol could not communicate directly, forming a data silo.
- Lost Data Value: High-resolution pressure data was trapped locally, unavailable for real-time closed-loop control (e.g., adjusting pump frequency based on pressure fluctuations) or for uploading to the MES for quality traceability.
- High Wiring Costs: Building a separate DeviceNet master and network for just a few sensors would be expensive, complex, and increase maintenance overhead.
- Monitoring Blind Spots: Operators in the central control room could not remotely monitor pressure values in real time, relying on manual inspections of local gauges, leading to delayed responses.
- Lack of Alarms and History: Pressure anomalies could not trigger immediate alarms, and without historical data, it was difficult to trace quality defects (like color variations or orange peel) back to pressure fluctuations.
The Solution: DeviceNet-to-PROFINET Gateway
To overcome these challenges, a specialized industrial gateway was deployed. This device acts as a protocol converter, bridging DeviceNet and PROFINET networks seamlessly. On the PROFINET side, it appears as a standard IO device (slave), while on the DeviceNet side, it functions as a master, actively scanning and collecting data from connected sensors like the ifm FDB002.
Key Gateway Features
- Bidirectional Protocol Conversion: Translates between DeviceNet and PROFINET in real time, enabling transparent data exchange.
- Data Mapping: Using simple configuration software, sensor values (pressure, status bits) are mapped directly into the PLC’s input image area (e.g., IW100), allowing the PLC to read them as if they were local I/O.
- Multi-role Functionality: Beyond protocol conversion, it serves as a data collector (digitizing physical signals), an IoT gateway (connecting devices to broader networks), and offers edge processing capabilities like data filtering and unit conversion.
Step-by-Step Implementation
The integration process is straightforward and can be completed in five steps:
| Step | Action | Details |
|---|---|---|
| 1. Hardware Connection | Connect the ifm FDB002 sensor to the gateway’s DeviceNet port using a standard DeviceNet cable. Then, connect the gateway to the PROFINET network (switch or PLC PN port) via an Ethernet cable. | Ensure proper termination resistors and baud rate settings (typically 125, 250, or 500 kbps). |
| 2. Gateway Configuration | Use the gateway’s configuration software to set DeviceNet parameters (MAC ID, baud rate) and scan for the FDB002 sensor. Map the sensor’s data channels (pressure value, device status) to the gateway’s internal memory. | The software typically provides a graphical interface for easy mapping. |
| 3. PLC Configuration | In TIA Portal, install the gateway’s GSDML file. Add the gateway as a standard PROFINET IO device in the network configuration and assign input/output addresses (e.g., 128 bytes of input for sensor data). | The GSDML file describes the gateway’s data structure to the PLC. |
| 4. Data Mapping | In the gateway configuration, link the DeviceNet data to the PROFINET input addresses. For example, map the FDB002 pressure value to IW100 in the S7-1200. | This step ensures the PLC sees the sensor data at the correct memory location. |
| 5. Programming & Testing | In the PLC program, read the mapped addresses (e.g., IW100) to access real-time pressure values. Configure HMI screens to visualize the data and set up alarms. | Verify data consistency and response time under normal and peak load conditions. |
Results: Before and After Integration
The impact of deploying the gateway was immediate and significant. The following table summarizes the improvements:
| Aspect | Before | After |
|---|---|---|
| Data Accessibility | Pressure data isolated on DeviceNet; no PLC access. | Real-time pressure values available in PLC and SCADA. |
| Control Integration | Manual pressure adjustments based on local gauges. | Closed-loop control: PLC adjusts pump speed based on pressure feedback. |
| Quality Traceability | No historical pressure data; root cause analysis impossible. | Pressure trends logged and linked to production batches in MES. |
| Alarm Management | No automatic alerts; reliance on operator rounds. | Instant alarms on HMI for pressure deviations, reducing downtime. |
| Cost Efficiency | High cost to deploy separate DeviceNet infrastructure. | Minimal cost using existing PROFINET backbone; quick ROI. |
Industry Applications and Future Outlook
The gateway solution is not limited to painting lines. Its ability to connect legacy devices to modern networks makes it valuable across many industries:
New Energy & Battery Manufacturing
Production lines often include third-party equipment (coaters, winders) using DeviceNet or CC-Link. Gateways unify data into PROFINET or EtherNet/IP networks for full digital traceability.
Smart Logistics & Warehousing
Stacker cranes, conveyors, and sorters from different vendors use various protocols. Protocol converters enable reliable communication and coordinated scheduling for 24/7 operation.
Semiconductor & Electronics
Strict cleanroom environmental control requires integrating sensors (often Modbus or BACnet) into the main control system for precise monitoring and compliance recording.
Food & Pharmaceutical
In regulated industries (FDA GMP), smart gateways bind production parameters and environmental data to batch records, providing tamper-proof data for electronic batch reporting.
Technical Considerations for Reliable Operation
When implementing a DeviceNet-to-PROFINET gateway, keep these best practices in mind:
- Network Topology: Ensure the DeviceNet trunk line is properly terminated with 121-ohm resistors at both ends. Use the correct cable type (thick or thin) based on distance and baud rate.
- Addressing: Assign unique MAC IDs to each DeviceNet node (0-63). Avoid conflicts with the gateway’s own MAC ID.
- Data Consistency: Configure the gateway’s update rate to match the PLC’s cycle time. For critical pressure control, a refresh time of 10-20 ms is typical.
- Diagnostics: Use the gateway’s built-in web server or diagnostic LEDs to monitor DeviceNet bus health, error counters, and PROFINET connection status.
- Scalability: One gateway can typically handle up to 63 DeviceNet nodes. Plan for future expansion by reserving address space in the PLC.
Typical Configuration Parameters for ifm FDB002
The ifm FDB002 is a high-precision pressure sensor with DeviceNet interface. Key parameters to map include:
- Pressure Value: 16-bit integer (scaled in mbar, psi, or bar depending on configuration).
- Temperature: Optional process temperature reading.
- Status Bits: Device health, alarm flags, and communication status.
In the gateway, these are typically mapped to consecutive input words (e.g., IW100 for pressure, IW102 for temperature, IW104 for status).
Conclusion
The successful retrofit of the painting line demonstrates that protocol conversion gateways are no longer simple accessories but essential components of a smart factory’s neural system. By acting as a bridge between DeviceNet and PROFINET, these devices unlock valuable field data, enabling it to flow from local control to cloud analytics. This empowers process optimization, quality improvement, and data-driven decision-making. As industrial IoT continues to evolve, flexible and reliable gateways will become standard in any industry pursuing digital transformation, providing a solid data foundation for manufacturing excellence.
For specific configuration details or technical inquiries, consult the gateway manufacturer’s documentation or reach out to automation specialists.
