IS220UCSAH1A GE

Model: IS220UCSAH1A
Manufacturer: GE (General Electric)
Core Function: Functions as a standalone embedded controller (UCSA-H1A) executing deterministic real-time control logic for turbine sequencing, regulation, protection, and monitoring, with distributed I/O communication over IONet Ethernet.
System Compatibility: Compatible with Mark VIe and Mark VIeS control systems in simplex, duplex, or TMR (Triple Modular Redundancy) configurations; supports applications in 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: 18-32 V DC nominal (typically 24-28 V DC from system distribution)
Power Consumption: Approximately 10-15 W typical (up to ~12.5 W nominal under load)
Communication Interfaces: Multiple Ethernet ports (typically 5, including dual IONet for private control network and others for supervisory/HMI connectivity); 100 Mbps full-duplex support
Memory: 256 MB DDR SDRAM (some configurations reference up to 512 MB)
Operating System: QNX Neutrino real-time OS
Operating Temperature Range: -30°C to +65°C, suitable for industrial control 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 0.5-1 kg (varies by reference; typically ~0.9-1 kg including casing)
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-level certification
MTBF (Mean Time Between Failures): >200,000 hours per GE reliability estimates, enabling long-term continuous operation
Software Compatibility: ControlST (V04.03 and later recommended), ToolboxST for configuration, diagnostics, and application loading

Technical Architecture & Functional Positioning

The IS220UCSAH1A (UCSA-H1A) serves as the central processing unit in the distributed Mark VIe architecture, positioned at the control layer to run application code for turbine governor, sequencing, protection, and auxiliary functions. It communicates deterministically with field I/O packs via the dedicated IONet Ethernet network, offloading I/O processing while executing core logic with high temporal predictability. The embedded PowerQUICC II PRO processor, combined with QNX Neutrino RTOS, ensures sub-millisecond response for critical loops, supported by onboard diagnostics, watchdog timers, and redundant Ethernet paths.

This design addresses key turbine control requirements, such as bumpless redundancy in TMR setups (2-out-of-3 voting), fault containment, and scalability across single-unit to multi-shaft plants. Multiple Ethernet interfaces separate control traffic (IONet) from supervisory networks, reducing interference and enhancing cybersecurity. Firmware and application code are loaded/configured via ToolboxST, allowing parameter tuning, alarm management, and logic modifications without hardware intervention. In hazardous locations, compliance with GEH-6725 guidelines ensures safe deployment when properly powered and enclosed.