- Model: IS220UCSAH1A
- Manufacturer: GE (General Electric)
- Core Function: Acts as a standalone embedded controller (UCSA-H1A) executing deterministic real-time turbine control applications, including sequencing, governing, protection, and monitoring, while communicating with distributed I/O packs over IONet Ethernet.
- System Compatibility: Compatible with Mark VIe and Mark VIeS control systems in simplex, duplex, or TMR configurations; integrates with GE Distributed Gas Turbine Control Systems, EX2100e, LS2100e, and related platforms.
- Supply Status: In Stock / Available as new surplus, refurbished, or from verified global inventory.
- Warranty Standard: 12-month functional warranty, fully tested.
Key Technical Specifications
- Product Model: IS220UCSAH1A
- Manufacturer: GE
- System Platform: Mark VIe Turbine Control System
- Processor Type: Freescale PowerQUICC II Pro (PowerPC 8349 equivalent)
- CPU Frequency: 667 MHz
- Power Supply Voltage: 18-36 V DC nominal (typically 24-28 V DC from system power distribution)
- Power Consumption: Approximately 12 W typical (up to 15 W under load)
- Communication Interfaces: 5 Ethernet ports (including dual IONet for private control network and additional for supervisory/HMI connectivity); 100 Mbps full-duplex support
- Memory: 256 MB DDR SDRAM
- Operating System: QNX Neutrino real-time OS
- Operating Temperature Range: -30°C to +65°C, suitable for industrial enclosures
- Humidity Tolerance: 5% to 95% non-condensing
- Dimensions: Compact embedded module with heat sink (standard Mark VIe controller footprint for panel/rack mounting)
- Weight: Approximately 0.9-1 kg (some references list ~2 lbs / 0.9 kg)
- Certification Standards: CE compliant, UL listed, meets IEC 61131-2 for programmable controllers; hazardous location approvals (Class I Div 2 / Zone 2 per GEH-6725); supports ATEX/IECEx via system integration
- MTBF (Mean Time Between Failures): >200,000 hours per GE reliability modeling, supporting extended continuous service
- Software Compatibility: ControlST (V04.03 and later recommended), ToolboxST for configuration, diagnostics, and application management
Technical Architecture & Functional Positioning
The IS220UCSAH1A (UCSA-H1A) forms the computational core of the Mark VIe distributed architecture, residing at the control layer to run application-specific code for turbine start/stop sequencing, speed/load governing, protective functions, and auxiliary controls. It interfaces deterministically with field I/O packs via the private IONet Ethernet network, distributing I/O processing while centralizing logic execution for low-latency response. The Freescale PowerQUICC II Pro processor, paired with QNX Neutrino RTOS, delivers high determinism for real-time tasks, supported by onboard diagnostics, watchdog timers, and redundant communication paths.
This design resolves key challenges in turbine automation, including bumpless redundancy in TMR setups (2-out-of-3 voting), fault isolation, and scalability from single turbines to multi-shaft combined-cycle plants. Separated Ethernet interfaces isolate control traffic from supervisory networks, improving performance and security. Firmware and control applications are managed through ToolboxST, enabling parameter adjustments, alarm configuration, and logic updates without hardware modifications. Hazardous location compliance per GEH-6725 supports deployment in classified areas when integrated with approved enclosures and power supplies.
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