AUTBUS Radar Level Control System for Grain & Oil Industry

Understanding AUTBUS Technology in Industrial Automation

AUTBUS is an industrial fieldbus standard designed for high-speed, deterministic communication over long distances. It supports multi-drop topologies and can connect up to 254 nodes on a single segment, with data rates up to 100 Mbps. Unlike traditional fieldbuses, AUTBUS uses a broadband bus architecture that allows simultaneous transmission of multiple protocols, including Ethernet/IP, Modbus TCP, and PROFINET, over a single two-wire cable. This makes it particularly suitable for large-scale grain storage facilities where hundreds of sensors and actuators need to be integrated seamlessly.

The technology is gaining traction in sectors such as petrochemicals, mining, building materials, food processing, and pharmaceuticals. Its open, interoperable ecosystem enables users to mix devices from different vendors without being locked into proprietary solutions. This flexibility is critical for grain and oil plants that often have legacy equipment alongside new installations.

Radar Level Control System Architecture

A typical AUTBUS-based radar level control system for grain and oil applications consists of four main components:

• Radar Level Transmitters: Non-contact 80 GHz FMCW radar sensors provide accurate level measurement regardless of dust, temperature, or vapor. Typical accuracy is ±2 mm, with a measuring range up to 120 meters. These sensors are mounted on top of silos or tanks and communicate via AUTBUS directly to the control system.
• AUTBUS Fieldbus Infrastructure: A single two-wire cable (unshielded twisted pair) connects all field devices, carrying both power and data. Repeaters and gateways extend the network up to 10 km. The bus supports intrinsic safety (Ex ia) for hazardous areas common in grain dust environments.
• Controllers and Edge Gateways: Instead of a traditional PLC, an AUTBUS controller or edge computing device handles data acquisition, protocol conversion, and local logic. It can run advanced algorithms for predictive maintenance and process optimization.
• SCADA and Cloud Integration: The system integrates with SCADA software for visualization, alarm management, and historical trending. Data can be pushed to cloud platforms for enterprise-level analytics, enabling remote monitoring via web or mobile dashboards.

Key Benefits for Grain and Oil Processing

The system’s ability to replace physical PLCs for data collection from radar sensors reduces hardware costs and cabinet space. It also simplifies maintenance because field devices can be configured and diagnosed remotely from the control room. In grain elevators and flour mills, where dust explosions are a constant risk, the reduced wiring and intrinsic safety design enhance overall plant safety.

Real-World Application: Rice and Flour Milling

In a typical rice processing plant, raw paddy is stored in multiple silos before milling. Accurate level measurement is critical to avoid overfilling and to manage inventory. An AUTBUS radar system continuously monitors levels and transmits data to the SCADA system. The built-in algorithms analyze consumption patterns and suggest optimal refill schedules, reducing demurrage costs and preventing production stoppages.

For flour mills, the system monitors wheat storage, tempering bins, and finished product silos. The high dust environment does not affect radar accuracy, and the fast update rate (up to 100 ms per device) allows detection of bridging or rat-holing inside bins. Alarms can be configured to trigger when material flow is interrupted, enabling operators to take corrective action before equipment damage occurs.

The Growing AUTBUS Ecosystem

The AUTBUS standard is supported by a dedicated alliance that includes chip manufacturers, device vendors, system integrators, and end users. This ecosystem ensures continuous innovation and interoperability. Recent additions to the ecosystem include:

• New radar sensors with IO-Link over AUTBUS for advanced parameterization.
• Edge controllers with OPC UA server functionality for seamless IT/OT integration.
• Pre-engineered solution packages for grain storage, including templates for SCADA screens and reports.
• Training and certification programs for engineers and technicians.

As the technology matures, more industries are adopting AUTBUS for applications beyond level measurement, such as temperature monitoring, vibration analysis, and energy management. The grain and oil sector is poised to benefit significantly from this trend, especially as food safety regulations become stricter and traceability requirements increase.