ABB 3BHB006449R0002 UPC325AE01 Fieldbus Photoelectric Isolation Interface Board

ABB 3BHB006449R0002 UPC325AE01 Fieldbus Photoelectric Isolation Interface BoardThrough photoelectric coupling devices, the internal bus of the excitation system is electrically isolated from the external DCS/PLC field bus, effectively suppressing high-voltage surges, grounding loop interference, and electromagnetic interference, protecting the excitation main control board from being damaged by strong electric shocks, and improving the communication stability of the power plant in a strong electromagnetic environment.
Long-distance Bus Data Transmission
Supporting industrial fieldbus protocols such as Profibus, RS485, etc., to remotely upload the remote measurement and remote signaling data of the excitation system to the central control DCS system, while receiving remote excitation regulation, switching, start/stop control instructions from the remote end.
Signal Level Conversion and Waveform Shaping
Converting the differential signals of the bus, amplifying and shaping the waveforms, extending the transmission distance of the bus communication, avoiding signal attenuation, error codes, and communication interruption problems caused by long cables, and adapting to the cross-region wiring scenarios between high and low voltage cabinets in power plants.
System Communication Redundancy Expansion
Can be used as a backup bus communication channel for the excitation system, combined with the main communication board to achieve communication redundancy, ensuring uninterrupted data interaction between the excitation system and the upper-level control system when a single bus fails, meeting the safety operation specifications of the generator set.

Hardware Technical Parameters
Power Supply Method: DC power supply from the back panel of the excitation machine frame
Isolation Voltage: Electrical isolation on both high and low voltage sides, insulation withstand voltage meets the industrial strong interference level
Supported Bus: Profibus-DP, RS485 Modbus RTU
Dimensions: 227mm × 55mm × 12.8mm
Net Weight: 0.28kg
Installation Method: Standard rack slot installation, can be deployed in the same rack as the COB main control board, MUB measurement board

Environmental Parameters
Operating Temperature: 0℃～+60℃
Storage Temperature: -40℃～+85℃
Operating Humidity: 5%～95% RH (no condensation)
Protection Grade: IP20 (installed in the control cabinet)
Industrial Certification: CE, UL Industrial Safety Certification

Typical Application Scenarios
ABB UNITROL Series Excitation System Profibus Bus Communication Isolation Spare Parts for Thermal Power Plants, Hydropower Plants, and Self-owned Power Plants
Remote communication transformation between excitation devices and central control DCS to solve communication interference and frequent chain break faults
Expansion of old excitation systems, redundant upgrade and replacement of communication channels for spare parts in the excitation system of generator sets
Synchronous Generator Excitation Control System Signal Isolation and Remote Data Collection for Metallurgical, Chemical, and Gas Turbine Power Plants