Petrobras UN-BA

Each Petrobras UN-BA collection station features a robust, secure control architecture comprised of two Altus PLCs—one dedicated to process control and the other to communications. Both devices are interconnected via the Alnet II network, forming an integrated system with the PLCs installed at the treaters, thereby ensuring synchronization and efficient data exchange between units.

The process PLC oversees system control and interlocking, and communicates via MODBUS protocol with a local HMI, located on the panel door, which manages pump and valve commands, monitors alarms with historical data, and tracks analog variables like pressure and levels. Inputs and outputs are managed through Ponto Series buses, acting as slaves on the PROFIBUS network via the Altus AL-3406 Interface (PROFIBUS Master) located in the Process PLC.

The communications PLC interfaces with level meters and satellite wells. In addition to these connections, it links to the Operations Center via two networks—Ethernet and Alnet I over radio modem—with the latter used only if the Ethernet connection fails.

This structure provides high availability, reliability, and efficient control, meeting Petrobras’s requirements with a modern, secure, and integrated solution ideal for critical operational environments.