The UCD208A101 3BHE020018R0101 Printed Circuit Board (hereinafter referred to as "UCD208A101 Board") is a core signal processing and logic control unit specifically designed by ABB for medium and high-voltage industrial control systems.

Based on a modular hardware architecture and anti-interference circuit design, it is mainly compatible with ABB DCS (Distributed Control Systems) such as AC 800M and Symphony Plus. It undertakes key technical functions including analog/digital signal conversion, control logic operation, and data interaction between modules.

Its hardware design complies with the IEC 61010-1 safety standard for industrial control equipment, and its electromagnetic compatibility (EMC) meets the requirements of EN 61326-1 Class A. It is suitable for industrial on-site environments with high electromagnetic interference and wide temperature fluctuations.

Technical Specifications

2.1 Signal Processing Performance

• Analog Input (AI): Supports 8 differential input channels. Signal types include 4-20mA DC and 0-10V DC. It has a resolution of 16 bits, a sampling rate of 200Hz per channel, an input impedance of ≥10MΩ (for voltage signals) and ≤25Ω (for current signals), and a linear error of ≤±0.05% FS (full scale).
• Digital Input (DI): Features 6 dry contact input channels, supporting 24V DC excitation. The response time is ≤1ms, and the input current ranges from 3 to 10mA.
• Digital Output (DO): Provides 4 relay output channels. The contact rating is 250V AC/5A and 30V DC/5A, with an output delay of ≤5ms.
• Data Processing: Equipped with a TI TMS320F28335 32-bit DSP processor, operating at a frequency of 150MHz. It has built-in 64KB SRAM and 256KB Flash, supports floating-point arithmetic, and the control cycle is configurable (minimum 1ms).

2.2 Electrical Characteristics

• Operating Voltage: 24V DC ±10%. Power consumption is ≤5W (no-load) and ≤12W (full-load).
• Isolation Performance: The isolation voltage between signal channels and power supply is 2500V AC (for 1 minute), and between channels is 1500V AC (for 1 minute). It adopts dual isolation technology of photoelectric isolation and magnetic isolation.
• Grounding Mode: Supports both floating ground and grounded modes, with a grounding resistance of ≤1Ω.

2.3 Environmental Adaptability

• Operating Temperature: -20℃~+60℃ (industrial-grade wide temperature range); Storage Temperature: -40℃~+85℃.
• Humidity: 5%~95% RH (no condensation); Protection Class: IP20 (board-level).
• Vibration Resistance: 10-500Hz, acceleration of 5g (sinusoidal vibration); Shock Resistance: 50g (11ms, half-sine wave).

Technical Application Scenarios

Based on its high reliability and signal processing capability, the UCD208A101 Board is mainly applied in industrial scenarios with strict requirements for control accuracy and anti-interference performance:

• Power Industry: It is used in boiler water level control and steam turbine speed regulation systems of thermal power plants. Compatible with Symphony Plus DCS, it realizes high-precision acquisition and control of analog quantities (such as pressure and flow).
• Petrochemical Industry: It is applied in temperature/pressure interlock control of reaction kettles in refining and chemical units. Its isolation performance is utilized to resist electromagnetic interference generated by on-site frequency converters and motors.
• Metallurgical Industry: It is used for speed synchronization control of continuous rolling mills in steel plants. With a 1ms control cycle, it meets the real-time requirements of high-speed rolling.
• Water Treatment: It is applied in dissolved oxygen regulation of aeration tanks in sewage treatment plants. It supports parallel processing of multi-channel signals and is compatible with the redundant architecture of AC 800M DCS.

Advantages and Features

5.1 Hardware Reliability Technology

• Redundant Design: Supports dual power input (24V DC Channel A/B). It switches automatically when a power channel fails, with a switching time of ≤100μs.
• Anti-Interference Optimization: The PCB adopts a 4-layer design (signal layer, ground layer, power layer, shielding layer). Key signal traces use differential pair layout to reduce EMI (electromagnetic radiation).
• Service Life Enhancement: Industrial-grade electrolytic capacitors (10,000 hours lifespan @85℃) and lead-free soldering process are used, complying with the RoHS 2.0 environmental standard.

5.2 Software Adaptability Technology

• Protocol Compatibility: Supports industrial Ethernet protocols such as PROFINET, Modbus TCP, and EtherNet/IP. Communication parameters can be configured via ABB Control Builder M software.
• Firmware Upgrade: Supports online DSP firmware upgrade through USB interface, no need to disassemble the board, reducing maintenance costs.
• Diagnostic Function: Built-in self-diagnostic module. It can display real-time working status through LED indicators (power, communication, fault), and supports reading detailed fault codes (e.g., "E01-ADC Fault", "E02-Communication Interruption") via the DCS system.

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