IS420UCSBH1A | GE Electric Triple redundant safety controller board
Product Function
The IS420UCSBH1A is a triple-redundant safety controller board for GE’s Mark VIeS turbine control system. It executes SIL 3 (Safety Integrity Level 3) certified safety logic for critical turbomachinery protection, performing high-speed monitoring of sensors (vibration, temperature, pressure) and triggering failsafe shutdowns within milliseconds to prevent catastrophic equipment failure.
Product Specifications & Parameters
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Category
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Specification
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Manufacturer
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GE Digital (GE Power Conversion)
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Series
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Mark VIeS Integrated Safety System
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Type
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Safety Controller Board
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Redundancy
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Triple Modular Redundant (TMR) architecture
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Safety Certification
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SIL 3 (IEC 61508), TÜV Rheinland certified
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Processor
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32-bit RISC processor (triple-core synchronized)
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Memory
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256 MB SDRAM, 64 MB Flash
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I/O Interfaces
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• 2x 10/100Base-T Ethernet (STP RJ45)
• 1x SER expansion port (fiber optic) |
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Operating Voltage
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+5V DC ±5% (via VME backplane)
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Power Consumption
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15W typical
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Operating Temp.
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-40°C to +70°C (conformal coated)
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Relative Humidity
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5–95% non-condensing
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Dimensions
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233 x 160 mm (6U VME form factor)
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Certifications
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CE, RoHS, ISO 13849, ATEX/IECEx optional
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Series Information
Part of GE’s Mark VIeS Safety System – designed for critical turbomachinery control. Compatible with:
- Controllers: IS420UCSxHx series
- I/O Packs: IS420PDIAH1A (Analog), IS420ESWBH3A (Discrete)
- Backplanes: IS200VCRCH1B (VME rack)
Key Features
- Triple Modular Redundancy (TMR): Three independent processors voting for fault tolerance.
- SIL 3 Compliance: Meets highest industrial safety standards (1E-9 failure probability).
- Deterministic Execution: 10ms safety scan cycle with <100µs I/O response.
- Built-in Diagnostics: Continuous self-test of CPU, memory, and I/O paths.
- Secure Communications: Encrypted Ethernet protocols (SRTP, Modbus/TCP Safety).
- Voting Mechanisms: 2oo3 (two-out-of-three) logic for shutdown decisions.
- Seismic Resistance: Validated for 5g vibration (IEEE 344).
Role & Purpose
- Critical Protection: Safely shuts down turbines/compressors during overspeed, flameout, or vibration events.
- Fault Tolerance: Isolates failed modules without disrupting operations.
- Data Synchronization: Coordinates with non-safety controllers (e.g., IS420UCSAH1A) via SER fiber links.
- Compliance Engine: Enforces safety logic per API 670, ISO 10494, and NFPA 85 standards.
Applications & Use Cases
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Industry
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Application
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Power Generation
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Gas/steam turbine overspeed protection, boiler flame safeguards
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Oil & Gas
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Compressor surge control, offshore platform ESD systems
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Marine Propulsion
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Naval vessel engine safety monitoring, LNG carrier turbine controls
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Industrial Energy
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Cogeneration plant trip systems, blast furnace gas turbine protection
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Hydrogen/Chemical
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Electrolyzer safety interlocks, centrifugal compressor anti-surge
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Aviation Test Beds
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Jet engine test cell emergency shutdown (ESD)
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Technical Notes
- ⚙️ Configuration: Programmed via ToolboxST™ software with Safety Application Logic (SAL).
- 🔧 Hot-Swap: Supports live insertion/removal in VME racks (IS200VCRCH1B).
- 📡 Networking:
– ETH1: Safety network (peer-to-peer with other UCSB boards)
– ETH2: Engineering/maintenance access - 💡 Status LEDs:
- Green: Normal operation
- Red: Fault in one channel
- Flashing Red: TMR failure (requires shutdown)
- ️ Cyber Security: Integrated firewall with role-based access control.
Safety Rules:
- Must be paired with TMR-rated I/O (e.g., IS420PDOTH4B analog inputs)
- Maximum 12ms safety loop latency (sensor→UCSB→actuator)
- Requires annual validation testing per IEC 61511
System Integration Example
Mark VIeS Safety Rack:
[Slot 1: IS200VCCCH1D (Controller Chassis)]
[Slot 2: IS420UCSBH1A (Safety Controller)]
[Slot 3: IS420PDIAH1A (Analog Input TMR)]
[Slot 4: IS420ESWBH3A (Discrete Output TMR)]
[Slot 5: IS420EPDMG3A (Power Distribution)] 
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