- Model: IS220YDIAS1A
- Manufacturer: GE (General Electric)
- Core Function: Provides high-integrity discrete contact input processing for safety-critical signals, with onboard wetting voltage, diagnostics, and secure communication over IONet for functional safety applications in turbine controls.
- System Compatibility: Compatible with Mark VIeS (Safety Mark VIe) control systems in simplex or redundant configurations; designed for SIL-rated protection in gas and steam turbines.
- Supply Status: In Stock for immediate global shipment (new surplus or refurbished from verified sources).
- Warranty Standard: 12-month functional warranty, fully tested.
Key Technical Specifications
- Product Model: IS220YDIAS1A
- Manufacturer: GE
- System Platform: Mark VIeS Safety Turbine Control System
- Power Supply Voltage: 28 V DC nominal (onboard wetting), operating range typically 18-32 V DC
- Power Consumption: Approximately 5-10 W typical, depending on input loading and diagnostics
- Communication Interfaces: Dual 100 Mbps Ethernet ports for IONet connectivity, supporting redundant, deterministic communication in safety architectures
- Discrete Inputs: 24 channels for dry contact or powered inputs (supports 28 V DC wetting voltage, max 32 V DC external)
- Input Type: Optically isolated discrete contact inputs with de-bounce filtering and diagnostic coverage for open/short detection
- Response Time: Configurable de-bounce and filtering for reliable detection of contact changes (typically <10 ms)
- Operating Temperature Range: -30°C to +65°C, suitable for turbine hall and control room environments
- Humidity Tolerance: 5% to 95% non-condensing, with conformal coating for environmental protection
- Dimensions: Standard Mark VIe I/O pack form factor (approximately 8.26 cm × 4.19 cm × 12.1 cm)
- Weight: Approximately 0.5-0.7 kg, facilitating field replacement
- Certification Standards: CE compliant, UL listed, meets IEC 61508 SIL 3 capability (when integrated in Mark VIeS TMR systems); hazardous location approvals (Class I Div 2 / Zone 2 per GEH-6725)
- MTBF (Mean Time Between Failures): Exceeds 250,000 hours per GE reliability data for safety-critical components
- Isolation Voltage: 1500 V AC between channels, power, and Ethernet interfaces, protecting against noise and ground faults
Technical Architecture & Functional Positioning
The IS220YDIAS1A operates at the field I/O layer in the Mark VIeS safety architecture, serving as a high-integrity discrete input pack that processes contact signals from emergency stops, permissives, limit switches, and other safety devices. It mounts on compatible terminal boards (e.g., WROBH or similar safety variants) and performs local signal conditioning, wetting voltage application, de-bounce filtering, and diagnostic monitoring before transmitting secure data over IONet to the safety controller. This positioning ensures rapid, reliable detection of discrete state changes with built-in fault coverage, critical for achieving SIL 3 integrity in turbine protection functions.
Core technologies include optical isolation per channel, comprehensive diagnostics (open wire, short circuit, stuck-at faults), and redundant Ethernet communication for fault-tolerant operation. These features address key safety engineering challenges, such as preventing spurious trips from noise or wiring faults while maintaining high diagnostic coverage for undetected failures. In TMR configurations, multiple packs enable 2-out-of-3 voting at the controller level, supporting fail-safe or fail-operational behaviors. Firmware configurable via ToolboxST allows adjustment of de-bounce times, alarm thresholds, and diagnostic reporting without hardware changes, facilitating compliance with functional safety standards.
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