- Model: IS220YDOAS1A
- Manufacturer: GE (General Electric)
- Core Function: Delivers high-integrity discrete contact outputs with relay or solid-state drivers, onboard diagnostics, and secure IONet communication for executing safety-critical actions such as turbine trips, valve shutdowns, and permissive controls in functional safety environments.
- System Compatibility: Compatible with Mark VIeS (Safety Mark VIe) control systems in simplex or TMR configurations; engineered 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: IS220YDOAS1A
- Manufacturer: GE
- System Platform: Mark VIeS Safety Turbine Control System
- Power Supply Voltage: 24-28 V DC nominal, operating range typically 18-32 V DC
- Power Consumption: Approximately 6-12 W typical, depending on output loading and relay state
- Communication Interfaces: Dual 100 Mbps Ethernet ports for IONet, supporting redundant deterministic safety communication
- Discrete Outputs: 16 channels (typically relay contacts rated 2 A @ 24-125 V DC / 120-240 V AC, or solid-state equivalents in safety configurations)
- Output Type: Form-C relay contacts with diagnostic monitoring for coil integrity, contact welding, and stuck states
- Contact Rating: 2 A resistive at 125 V DC / 240 V AC; inductive loads supported with suppression
- Response Time: <10 ms typical for output state change (configurable for safety timing requirements)
- Operating Temperature Range: -30°C to +65°C, suitable for harsh turbine environments
- Humidity Tolerance: 5% to 95% non-condensing, with conformal coating for protection
- Dimensions: Standard Mark VIe I/O pack size (approximately 8.26 cm × 4.19 cm × 12.1 cm)
- Weight: Approximately 0.6-0.8 kg, designed for easy rack replacement
- Certification Standards: CE compliant, UL listed, IEC 61508 SIL 3 capable (when used in Mark VIeS TMR architecture); hazardous location ratings (Class I Div 2 / Zone 2 per GEH-6725)
- MTBF (Mean Time Between Failures): >250,000 hours per GE safety component data
- Isolation Voltage: 1500 V AC between channels, power, and Ethernet interfaces
Technical Architecture & Functional Positioning
The IS220YDOAS1A functions at the field actuation layer in the Mark VIeS safety system, serving as a high-diagnostic discrete output pack that drives safety-critical devices such as fuel shutoff valves, trip solenoids, emergency stops, and permissive relays. It mounts on compatible safety terminal boards (e.g., WROBH or WROFH variants) and receives secure commands over IONet from the safety controller, applying them through monitored relay drivers while performing continuous diagnostics on coil continuity, contact state, and stuck conditions.
The architecture incorporates optical isolation, redundant Ethernet paths, and comprehensive fault coverage to achieve high diagnostic coverage required for SIL 3 applications. These features solve critical safety engineering problems, including prevention of dangerous failures (e.g., failure to trip) and minimization of spurious trips through robust diagnostics and voting in TMR setups. Relay outputs provide galvanic isolation and high current capability for direct actuation of industrial devices, while firmware allows configuration of output behavior (energize-to-trip or de-energize-to-trip) and diagnostic thresholds via ToolboxST.
In TMR Mark VIeS configurations, multiple packs support 2-out-of-3 voting at both output and controller levels, ensuring fail-safe operation with high availability.
Typical Application Scenarios
- Deployed in gas turbine safety systems to drive main fuel shutoff valves and emergency trip solenoids during overspeed, flameout, or manual shutdown events.
- Used in steam turbine protection for actuating stop valves, governor dump valves, and extraction isolation during critical faults.
- Serves as a replacement in Mark VIeS safety retrofits, maintaining field wiring compatibility while adding advanced diagnostics for compliance.
- Applied in combined-cycle plants for coordinated safety shutdown across gas and steam units, ensuring synchronized protective actions.
- Utilized in industrial facilities requiring IEC 61508 SIL 3 compliance, where discrete outputs execute final element actions in safety instrumented functions.
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