2. Product Function Description

1. Local Bus & UCN Signal Conversion

   Real-time conversion between controller internal parallel backplane bus signals and UCN coaxial differential bus signals, realizing high-speed transmission of process values, setpoints, interlock status and alarm data.

2. Dual Redundant UCN Channel Support

   Equipped with A/B dual redundant UCN coaxial interfaces, hot backup switching without control disturbance when one communication channel fails, improving system network reliability.

3. Network Data Forwarding & Distribution

   Upload field IOP collected measurement data and equipment status to LCN operator stations via UCN bus; download operator control instructions, PID parameters, logic programs from upper nodes to local HPM/APM controllers.

4. Communication Fault Diagnosis & Isolation

   Built-in hardware self-diagnosis circuit to monitor coaxial cable open/short circuit, bus communication error, link loss and card power abnormality; automatically isolate faulty channels to avoid network spread failure.

5. Hot-Swap Design

   Standard Eurocard plug-in structure, supports online replacement without powering down the entire controller cabinet, reducing production downtime during maintenance.

6. Multi-node Network Scheduling

   Supports multi-controller UCN bus time-sharing communication scheduling, ensures deterministic real-time scan cycle for continuous process closed-loop control.

3. Core Electrical Technical Specifications

1. Communication Medium: 75Ω dual coaxial UCN bus

2. Interface: Dual redundant A/B UCN channel ports

3. Power Supply: 24VDC supplied through HPM/APM rack backplane

4. Operating Ambient Temperature: -40℃ ~ +70℃ industrial wide temperature range

5. EMI Protection: On-board metal shielding, TVS surge suppression, ESD protection for coaxial ports

6. Self-Diagnosis Items: UCN link detection, communication error counter, backplane bus heartbeat monitoring, power supply abnormal alarm

7. PCB Feature: Non-conformal coated circuit board, UL industrial safety certified

8. Mechanical Dimension: Standard DCS Eurocard size, rack plug-in installation

9. Power Consumption: Max 2.5W

10. Compatibility: Matches all standard HPM/APM main control boards (51304518 series APM CPU)

4. Industrial Application Scenarios

1. Chemical & Petrochemical Industry

   Reactor, distillation column, heat exchanger HPM cabinet UCN network communication gateway, realizing data interaction between field controllers and central control room operator stations.

2. Power Generation Industry

   Boiler, steam turbine, flue gas desulfurization auxiliary control cabinet network interface, transmitting boiler water level, steam pressure, furnace temperature real-time control data.

3. Oil & Gas Industry

   Pipeline compressor station, crude oil storage tank area distributed control network node, supporting custody transfer flow, tank level and pressure signal network transmission.

4. General Process Control

   Water treatment, pharmaceutical, pulp & paper, energy storage plant TDC3000/TPS system controller UCN bus communication conversion.