ABB UF_C921_A101 3BHE024855R0101/1 – Factory-Tested Process Control Circuit Board

Description

Application Scenarios

At a coal-fired power plant in South Africa,engineers experienced intermittent communication faults between the main controller and remote I/O racks.Diagnostics revealed that an aging auxiliary control board was failing to maintain stable signal integrity on the backplane bus.The team replaced the unit with the ABB UF C921 A101 3BHE024855R0101/1,which restored consistent data transmission across the network.Post-installation,the system reported zero packet loss over a six-month period,and operator alarms related to communication timeouts ceased entirely.The board’s enhanced filtering and robust driver circuitry proved essential in maintaining system reliability in the presence of high electrical noise from nearby high-power drives and switchgear.

Parameter

Main Parameters Value/Description

Product Model ABB UF C921 A101 3BHE024855R0101/1

Manufacturer ASEA Brown Boveri(ABB)

Product Category Control&Interface Circuit Board

Function Signal Conditioning/Communication Interface/Auxiliary Control

Compatible System ABB Symphony Plus,Symphony DCS

Input Voltage 24 V DC(Typical,via Backplane or Terminal)

Logic Level TTL/24 V DC(Industrial Standard)

Communication Interface RS-485,CANbus,or Proprietary ABB Fieldbus(Likely)

Protection Features Overvoltage,Reverse Polarity,ESD Protection

PCB Type Multilayer FR-4,Conformal Coated(Humidity Resistant)

Operating Temperature 0°C to+60°C

Storage Temperature-25°C to+85°C

Installation DIN Rail or Backplane Mount(Symphony Cabinet Compatible)

Standards Compliance IEC 61131,IEC 61010,CE,RoHS

Note:Exact function may vary based on firmware and system configuration.This board is likely used in conjunction with main controllers such as UNS0874A or CP571 HMI systems.

Technical Principles and Innovative Values

Innovation Point 1:The ABB UF C921 A101 3BHE024855R0101/1 integrates high-speed opto-isolation to protect sensitive control circuits from ground loops and voltage transients,ensuring signal integrity in high-noise industrial plants.

Innovation Point 2:Designed with modular firmware architecture,the board can be reconfigured or upgraded via ABB engineering tools(e.g.,Control Builder Plus),enabling flexible application across different control strategies.

Innovation Point 3:Built-in diagnostic LEDs and fault reporting allow quick identification of power,communication,or hardware issues,reducing troubleshooting time during maintenance.

Innovation Point 4:High-density surface-mount technology(SMT)and multilayer PCB design enhance reliability and reduce footprint,making it ideal for space-constrained DCS racks.

Innovation Point 5:Compatibility with ABB’s redundant architectures ensures seamless integration into fault-tolerant systems where uptime is critical.

Application Cases and Industry Value

In a petrochemical refinery in Saudi Arabia,a legacy control board caused frequent resets in a safety shutdown system.After replacing it with the ABB UF C921 A101 3BHE024855R0101/1,the system achieved uninterrupted operation for over 15 months.Engineers praised its stable performance and compatibility with existing Symphony infrastructure,avoiding costly cabinet redesign.

At a water desalination plant in Singapore,the ABB UF C921 A101 3BHE024855R0101/1 was deployed as part of a DCS upgrade.Its reliable signal processing improved pump sequencing accuracy,reducing energy consumption by 8%due to optimized start/stop cycles.Maintenance staff noted the ease of replacement and clear status indicators,which simplified shift handovers.

Related Product Combination Solutions

ABB UNS0874A:Main process controller that may communicate with or supervise the UF C921 A101 module.

ABB CP571/CP581:HMI stations linked through the same control network.

ABB VD4100/VQ Series I/O:Digital and analog modules interfacing via shared backplane or bus.

ABB Control Builder Plus:Engineering software used to configure,monitor,and troubleshoot the board.

ABB UN0820B-P HIER460385-R1:Power distribution PCB supplying stable 24V DC to the control rack.

ABB 3BHE024855R0080:Earlier revision of the same board(verify firmware compatibility).

ABB 3BFE014967R0002:Cabinet assembly where the board is mounted and integrated.

ABB Surge Protection Devices(e.g.,OVR series):Installed upstream to protect against voltage spikes.

Installation,Maintenance,and Full-Cycle Support

To install the ABB UF C921 A101 3BHE024855R0101/1,first power down the DCS cabinet and follow ESD safety procedures.Insert the board into the designated slot on the backplane or DIN rail mount,ensuring proper alignment.Reconnect any external signal or power cables,then restore power.Verify operation via LED indicators—green for normal,red for fault.Use ABB Control Builder Plus or drive HMI to confirm communication and system status.

Routine maintenance includes visual inspection for overheating signs,dust buildup,or loose connections.Clean with compressed air if necessary.Due to high integration density,onboard component repair is not recommended—replace the entire unit if faulty.

We offer full lifecycle support,including technical documentation,firmware verification,burn-in testing,and access to certified spare units.Whether for emergency replacement or system modernization,our team ensures seamless integration of the ABB UF C921 A101 3BHE024855R0101/1 into your automation environment.

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