GE IS220YDOAS1A Mark VIeS Safety Discrete Output I/O Pack
GE IS220YDOAS1A: Mark VIeS Safety Discrete Output I/O Pack
The GE IS220YDOAS1A is a high-reliability Discrete Output (DO) I/O pack designed specifically for the Mark VIeS Functional Safety System.
As a critical component in GE’s Speedtronic™ turbine control lineage, the “YDOA” acronym signifies its role as a safety-rated module (indicated by the ‘Y’) used to interface between the controller’s Ethernet-based IONet and various discrete output terminal boards.
It is engineered to meet stringent IEC 61508 safety standards for gas, steam, and wind turbine applications.
Technical Parameter Table
| Parameter | Specification |
| Manufacturer | GE (General Electric) |
| Model Number | IS220YDOAS1A |
| Functional Abbreviation | YDOA |
| Control System | Mark VIe / Mark VIeS (Safety) |
| Number of Channels | 12 Relay Channels |
| Nominal Power Supply | 28.0 V DC (Range: 18 – 32 V DC) |
| Response Time | ~6 ms (Total system response) |
| Communication | Dual 100 MB Ethernet (IONet) |
| Operating Temp | -30°C to +65°C (-22°F to +149°F) |
| Diagnostics | 18 Status LEDs (12 for Output status) |
| Safety Certification | SIL 2 / SIL 3 Capable; UL/cUL 508 |
Related Models & Hardware
The IS220YDOAS1A must be paired with specific terminal boards to function:
Terminal Boards: IS200TRLYS1F, IS200TRLYS2F, IS400TRLYS1F, IS400TRLYS2F.
Non-Safety Equivalent: IS220PDOAH1A / IS220PDOAH1B (Standard Mark VIe).
Companion Modules: IS220YDIAS1A (Discrete Input), IS220YAICS1A (Analog I/O SIL).
Application Cases
Emergency Trip Systems (ETS): Actuating fuel shut-off valves in gas turbines during overspeed or flame-out conditions.
Generator Protection: Managing circuit breaker trip logic to isolate turbines from the grid during electrical faults.
Fire and Gas Logic: Interfacing with fire suppression systems and industrial alarms in hazardous environments.
Balance of Plant (BOP): Controlling critical pumps and auxiliary motors in combined-cycle power plants.
Product Advantages and Features
Triple Modular Redundancy (TMR): Supports TMR configurations where three I/O packs connect to a single terminal board for maximum fault tolerance.
Sequence of Events (SOE): Capable of high-resolution time-stamping for precise post-fault analysis.
Online Replacement: Supports “hot-swapping,” allowing maintenance without shutting down the entire control system.
Comprehensive Self-Diagnostics: Continuous monitoring of hardware health, processor RAM, flash memory, and Ethernet port integrity.
IS220YDOAS1A
Installation and Maintenance
Mounting: Plugs directly into the D-type connector on the terminal board and is secured via two threaded studs.
Cabling: Requires two RJ45 Ethernet cables (ENET1/ENET2) for redundant network connectivity.
Powering: Power is applied via a 3-pin side connector. The module features a soft-start circuit to manage inrush current.
Configuration: Software setup is performed through the ToolboxST application.
Unique Product Description
The GE IS220YDOAS1A serves as the “Safety Sentinel” for industrial automation.
Unlike standard discrete outputs, this module is built with an internal hardware architecture that emphasizes voting disagreement detection and fail-safe logic.
Whether it is managing the high-speed dynamics of a 9FA gas turbine or ensuring the structural safety of a wind farm,
the YDOA pack ensures that every command is executed with verified integrity, bridging the gap between digital Ethernet logic and heavy-duty physical actuators.
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Meta Description: Detailed technical specifications, application cases, and datasheet info for GE IS220YDOAS1A. The primary safety relay output module for Mark VIeS turbine control.
Primary Keywords: IS220YDOAS1A, GE YDOA, Mark VIeS Safety Module, Discrete Output I/O Pack, Speedtronic Mark VIe Parts