IS220YDIAS1AK GE

Model: IS220YDIAS1AK
Manufacturer: GE
Core Function: Acquires and conditions up to 16 discrete contact inputs (dry contacts or powered) with galvanic isolation and advanced diagnostics, transmitting status data over IONet for high-integrity monitoring and protection in safety instrumented systems.
System Compatibility: Compatible with GE Mark VIe and Mark VIeS distributed control systems, optimized for functional safety (SIL-capable) applications in Speedtronic turbine platforms.
Supply Status: Available as new surplus, refurbished, or repair/exchange; supported for safety-critical installations with ongoing lifecycle.
Warranty Standard: 12-month functional warranty, fully tested.

Key Technical Specifications

Product Model: IS220YDIAS1AK
Manufacturer: GE
System Platform: Mark VIeS
Power Supply Voltage: 24 V DC nominal (from terminal board), operational range typically 18-32 V DC for stable input sensing.
Power Consumption: Approximately 5-10 W, low dissipation suitable for safety cabinet density.
Communication Interfaces: Dual 100 Mbps Ethernet ports for redundant IONet connectivity to Mark VIeS controllers.
Discrete Inputs: 16 independent channels, supporting dry contact or 24 V DC powered inputs.
Input Voltage Range: 0-32 V DC typical, with wetting voltage supplied or external as required.
Input Current: <10 mA per channel, minimizing field device power draw.
Isolation: Galvanic isolation per channel/group, essential for safety integrity and noise immunity.
Diagnostic Coverage: Onboard monitoring for open/short, stuck-at faults, and channel health reporting.
Operating Temperature Range: -30°C to +65°C (extended in some configurations), robust for turbine environments.
Humidity Tolerance: 5% to 95% non-condensing, reliable in varying ambient conditions.
Dimensions: Standard Mark VIe pack footprint approximately 8-10 cm wide x 4-5 cm high, mounts on compatible terminal boards.
Weight: Approximately 0.6-0.8 kg, easy field replacement.
Mean Time Between Failures (MTBF): >150,000 hours (typical for Mark VIeS safety I/O), supporting high availability in SIL applications.
Certification Standards: CE compliant, UL 508 listed, designed for SIL 3 capability per IEC 61508 when integrated in approved Mark VIeS loops, RoHS.

Technical Architecture & Functional Positioning

The IS220YDIAS1AK serves as a safety-rated discrete input pack in the Mark VIeS architecture, positioned at the field layer interfacing with terminal boards (such as STCIS or TBCIS series) to monitor contact signals from switches, relays, limit sensors, and emergency devices. It digitizes inputs with isolation, applies diagnostics, and communicates status via redundant IONet to the safety controller. This design supports voted logic in TMR setups, minimizing common-cause failures critical for functional safety.

The pack features isolated opto-couplers, precision wetting circuits, and embedded diagnostics compliant with safety standards. Dual Ethernet ensures fault-tolerant paths, while firmware enables high diagnostic coverage for detecting wiring faults or sensor degradation. These capabilities address key safety engineering needs: reliable detection of discrete events in noisy turbine settings, prevention of spurious trips through robust filtering, and compliance with IEC 61508 SIL requirements for protection layers.

In Mark VIeS systems, it enables verifiable safety instrumented functions for turbine trips, permissives, and interlocks, contributing to low probability of dangerous failure.