1. Product Overview

2. Electrical Parameter Specifications

• Working Power Supply: Powered by VME backplane bus, input DC +5V / +12V / -12V standard VME rail power; typical rated operating power consumption ≤6.5W, standby no-load power ≤2.1W

• Bus Interface: Onboard dedicated ribbon cable signal conversion circuit, internal MRC parallel bus protocol conversion, supports multi-channel differential signal transmission between rack backplane and MRC main control unit; built-in signal filtering, ESD ±15kV contact protection and surge suppression circuit for ribbon port terminals

• Signal Level: Industrial TTL/5V differential bus standard, signal rise/fall time controlled within 80ns to restrain crosstalk interference among multi-core ribbon cable

• Front panel status indicators: Power OK LED, MRC bus active LED, ribbon link fault alarm LED for real-time running state monitoring

Environmental Specifications

• Operating Temperature (inside sealed control cabinet): 0℃ ~ +55℃

• Storage Temperature: -40℃ ~ +85℃

• Relative Humidity: 5%~95% non-condensing, no dew accumulation allowed

• Certification: Comply with CE EMC electromagnetic compatibility and UL industrial component safety standard for power plant DCS cabinet deployment

3. Core Functional Features

1. Ribbon bus to MRC protocol conversion core function: Convert multi-core flat ribbon cable parallel signal into standard MRC controller bus signal, realize high-speed bidirectional data interaction between workstation backplane and MRC main control board, responsible for DCS configuration download, real-time process data upload and fault message transmission.

2. Independent channel isolation design: Single ribbon port short-circuit or abnormal overload will not affect other bus channels and adjacent VME slot boards operation.

3. Onboard hardware self-diagnosis function: Automatically detect VME bus power abnormality, ribbon cable open/short circuit, MRC bus communication timeout; fault information is uploaded to host CPU via VME bus, triggering HMI system alarm and event log storage.

4. Standard single-slot VME card structure, cold swap available after cutting off single slot power without full workstation shutdown, greatly shorten field maintenance outage time.

5. Full PCB three-proof conformal coating (moisture-proof, dust-proof, anti-corrosion), adaptable to high-dust, high-humidity harsh industrial cabinet environment of thermal power and chemical enterprises.

4. G03 Version Upgrade Optimization vs G01/G02

1. Optimize internal differential signal filter circuit, effectively reduce transmission error caused by cabinet power frequency harmonic and peripheral inverter electromagnetic interference compared with early revisions.

2. Upgrade full set of industrial high-temperature resistant IC and electrolytic components to improve long-term continuous full-load running stability and lower component ageing failure rate.

3. Revise PCB wiring layout to optimize heat dissipation path and reduce internal operating temperature of core chips.

4. Upgrade ribbon port overcurrent protection threshold to avoid instant damage from field ribbon cable misplug and short-circuit.

5. Typical Application Field

6. Installation & Maintenance Specification

1. All plugging and unplugging operations must implement complete ESD anti-static grounding; cut off corresponding VME slot power before module replacement.

2. After installation and power-on, verify ribbon cable connection and MRC bus communication status via workstation diagnostic software to confirm normal data interaction before formal system startup.

3. Clean PCB surface and front ribbon port terminals every six months to remove accumulated dust and guarantee heat dissipation and contact reliability.

4. Spare modules need sealed storage in constant-temperature dry anti-static warehouse; quarterly short-time powered aging test is recommended to prevent component performance degradation caused by long-term idle placement.

7. Product Supply Status