GE IS200VCRCH1BBC VCRC Discrete I/O Processor Board

The IS200VCRCH1BBC (VCRC) is a compact discrete I/O processor board for GE Speedtronic Mark VI turbine control system, without daughterboard to save rack cabinet space. It serves as the digital signal interface between turbine main CPU and field contact devices, collecting limit switch, relay status, breaker feedback signals and output switch commands for solenoid valves, alarm indicators and safety interlock relays.

This VME single-slot pluggable board matches TBCI series terminal bases via J3/J4 D-Sub connectors, fully conformal coated PCB adapts to high-temperature, vibration-prone turbine workshop environment. It supports hot-swap replacement without rack shutdown, built-in optical isolation for all channels to resist heavy electromagnetic interference from rotating machinery and frequency converters.

Main Specifications

• Brand: GE General Electric; Model: IS200VCRCH1BBC; Series: Speedtronic Mark VI Turbine Control
• I/O Allocation: 48 optically isolated discrete digital inputs, 24 relay drive discrete outputs
• Matching Terminal Base: TBCI series digital signal terminal boards, connected by dual D-Sub J3/J4 ports
• Backplane Interface: Standard VME bus, high-speed real-time communication with main control CPU
• Power Supply: 5VDC backplane power, low power consumption design for long-term continuous operation
• Structure Feature: No daughterboard design, saves around 30% rack space vs VCCC equivalent module
• Environment: Operating -20℃ ~ +65℃, 5%–95% RH non-condensing, anti-vibration industrial grade
• Diagnostics: Front panel LED indicators for power, bus communication, channel open/short fault status
• Certifications: CE, UL industrial control compliance, meets power generation turbine safety standards

Core Functions

• Real-time acquisition of turbine auxiliary digital signals: breaker position, limit switches, lube oil pressure contacts, trip relay feedback status.
• Convert digital control logic commands from main controller into switch output signals to drive safety solenoids, alarm lights and interlock relays.
• Full-channel optocoupler isolation blocks surge voltage and electromagnetic noise, preventing external field faults from damaging internal rack circuits.
• VME high-speed bus data transmission ensures millisecond-level signal response for turbine emergency shutdown and safety protection logic.
• Comprehensive onboard self-diagnosis detects wire break, channel short-circuit and communication loss, uploading fault alarms to system monitoring host instantly.
• Hot-swappable single-slot modular design allows independent board replacement without cutting power to the whole turbine control rack.

Application Scenarios

• Digital I/O spare replacement for GE Mark VI gas turbine and steam turbine control racks in combined cycle thermal power plants.
• Turbine auxiliary control spare parts for petrochemical large centrifugal compressors, offshore platform power generation units.
• Maintenance backup inventory for waste heat power stations, metallurgical furnace power generation auxiliary control cabinets.
• Matching digital board paired with Mark VI main CPU, TBCI terminal bases and turbine safety interlock contact sensors.
• Retrofit replacement components for aging turbine control systems suffering digital signal loss, channel detection failure and output relay drive abnormality.

• Global aftermarket spare stock for power generation maintenance teams managing legacy GE Speedtronic Mark VI turbine control equipment worldwide.