FENA-11: Product OverviewThe FENA-11 is an Ethernet Network Adapter module that serves as a communication interface within ABB’s S800 I/O system. Its primary function is to bridge the gap between the high-speed plant information network (Ethernet TCP/IP) and the real-time process I/O level. This module is mounted in the left-most slot of an S800 I/O station baseplate, where it acts as the master for the local I/O modules (such as AI, DI, AO, DO) on its proprietary internal bus. Simultaneously, it provides two key external communication paths: a direct 10/100 Mbps Ethernet TCP/IP connection for higher-level systems like an AC 800M controller or an OPC server, and a PROFIBUS DP-V1 slave interface, allowing the entire S800 I/O station to be seamlessly integrated as a node on a PROFIBUS-DP network.This dual-role capability makes the FENA-11 a versatile integration component. It allows engineers to deploy a distributed S800 I/O station that can be accessed natively via TCP/IP for high-bandwidth data exchange with modern control systems, while also being available to legacy or specialized equipment that relies on the widely adopted PROFIBUS DP fieldbus. The module effectively transforms a remote I/O cluster into a intelligent field node, capable of reporting detailed diagnostic and process data over either network.
•• PROFIBUS Interface: RS-485, 9-pin D-Sub connector, baud rates up to 12 Mbps
•• PROFIBUS Protocol: DP-V1 Slave
•• I/O Link: Manages communication with up to 64 S800 I/O modules on the local baseplate
•• Power Supply: 24 VDC (via the S800 baseplate)
•• Configuration: Configured via ABB’s Control Builder or a dedicated configuration tool
•• Isolation: 500 V AC between field side (PROFIBUS) and system (Ethernet, I/O)
•• Operating Temperature: 0 to 60 °C (32 to 140 °F)
Core Features & Customer ValueThe module’s dual-homing capability provides significant network design flexibility and redundancy. A plant can use the Ethernet connection as the primary data path for its modern DCS (e.g., an AC 800M controller) while retaining the PROFIBUS connection as a secondary access path for a legacy PLC or a dedicated maintenance and diagnostic system. This allows for phased system upgrades and enhances overall system availability by providing an alternative data route.Support for the PROFIBUS DP-V1 protocol, an extension of the standard DP, is a critical feature. Unlike basic DP, DP-V1 supports acyclic communication, allowing parameterization, configuration, and detailed diagnostic data to be exchanged in addition to the cyclic process data. This means an engineering station can not only read process values but also remotely configure the FENA-11 and retrieve comprehensive module-level diagnostics from the entire S800 I/O station, enabling predictive maintenance and reducing troubleshooting time.The integration with the robust S800 I/O platform ensures high data integrity and availability. The FENA-11 manages the deterministic data exchange with the I/O modules, supporting features like channel-level fault detection. For the customer, this translates into a reliable and diagnosable remote I/O solution that minimizes the risk of data loss or corruption, which is essential for precise process control.
ABB FENA-11
Typical ApplicationsA typical application is in a brownfield modernization project within a water treatment plant. The existing control system may be a legacy PLC communicating via PROFIBUS DP. New intelligent instruments and a SCADA system requiring Ethernet/IP connectivity are being added. The FENA-11 allows a new S800 I/O station to be installed: the PLC continues to interact with it as a standard PROFIBUS slave, while the new SCADA system simultaneously accesses the same I/O data over Ethernet for visualization and data logging, all without needing a complex and costly gateway.In a pharmaceutical facility, the FENA-11 is used to create distributed process control islands. Each S800 station, headed by a FENA-11, is located near its process equipment (e.g., a bioreactor). An AC 800M controller in the main control room communicates with these stations via high-speed Ethernet. The PROFIBUS port on each FENA-11 is then used to connect local device-level networks, such as a cluster of variable frequency drives (VFDs) on PROFIBUS, creating a hierarchical and efficient network architecture.
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