ABB 3BHE022293R0101 (PCD232A) Communications I/O Module: The Central Nervous System of UNITROL 6000 Excitation Systems
Application Scenarios At a 2×350 MW combined cycle power plant, the UNITROL 6000 excitation system repeatedly reported “DCS Communication Timeout” alarms during peak summer demand. Each alarm lasted several seconds before self-recovering, but during that window the active/reactive power data on the operator station froze, leaving operators unable to assess unit status. Investigation revealed…















