Description

The ABB 35EK90 (Order Code: GJR5143100R0001) is a high-performance Bus Coupler Unit specifically designed for the ABB Advant OCS (Open Control System) and MasterBus 300 (MB300) architecture. Serving as the critical interface between the central controller (such as the 07ZE61 series) and distributed I/O stations, the 35EK90 enables reliable, deterministic data exchange over long distances in harsh industrial environments. This module acts as the “head” of a remote I/O rack, translating MasterBus 300 telegrams into local backplane signals for digital and analog I/O modules, ensuring seamless integration of field devices into the central control strategy.

Application Scenarios

In a large offshore oil platform, engineers needed to extend control capabilities to a new separation module located 800 meters from the main control room. Running individual cables for hundreds of I/O points was cost-prohibitive and prone to noise interference. By deploying the ABB 35EK90 as the bus coupler for a remote I/O station, the team established a robust MasterBus 300 link using a single shielded twisted-pair cable. The 35EK90 efficiently managed communication for 64 I/O modules, handling critical pressure, temperature, and valve status data with zero packet loss despite the high-EMI environment near compressors. Its built-in diagnostic capabilities allowed the central control system to instantly detect a ground fault in the remote rack, preventing a potential safety incident. The implementation of 35EK90 reduced cabling costs by 70% and simplified commissioning, proving its value as a cornerstone of distributed control architectures.