GE IS220PDOAH1B Mark VIe Discrete Output (PDOA) I/O Pack
GE IS220PDOAH1B: Mark VIe Discrete Output (PDOA) I/O Pack
The GE IS220PDOAH1B is a high-performance Discrete Output (PDOA) I/O pack within the Mark VIe Control System family.
It serves as the intelligent interface between the controller’s IONet (Ethernet-based network) and discrete output terminal boards.
This module is primarily responsible for digitizing control signals and driving up to 12 relays, making it a cornerstone for relay actuation and field device control in GE Speedtronic™ turbine systems.
Technical Parameter Table
| Parameter | Specification |
| Manufacturer | General Electric (GE) |
| Model Number | IS220PDOAH1B (Revision B) |
| Series | Mark VIe / Mark VIeS |
| Number of Channels | 12 Relay Control Channels |
| Microprocessor | Intel Celeron 300 MHz |
| Memory | 128 MB Flash Memory |
| Nominal Voltage | 28.0 V DC (Typical Range: 18 – 32 V DC) |
| Ethernet Ports | Dual 10/100 Mbps RJ45 (IONet) |
| Operating Temp | -30°C to +65°C (-22°F to +149°F) |
| Response Time | Typically < 1 ms (Internal processing) |
| Diagnostic Inputs | 15 Pack Inputs (Relay & Coil Monitoring) |
Related Models & Compatibility
The IS220PDOAH1B is designed to plug directly into various terminal boards:
Electromagnetic Relay Boards: TRLYH1B, TRLYH1C, TRLYH1D, TRLYH1F.
Solid-State Relay Boards: TRLYH1E.
Redundancy Options: Supports Simplex (1 pack), Dual (2 packs), and TMR (3 packs) configurations.
Alternative Versions: IS220PDOAH1A (Earlier revision), IS220YDOAS1A (Safety-rated version).
Application Cases
Turbine Control: Actuating fuel solenoid valves and auxiliary pumps in gas and steam turbines.
Power Plant Automation: Controlling heavy-duty breakers and isolation switches.
Oil & Gas Facilities: Managing emergency shutdown (ESD) relay logic.
Marine Propulsion: Synchronizing motor control and steering gear relay systems.
Product Advantages and Features
IS220PDOAH1B
Triple Modular Redundancy (TMR): Provides extreme fault tolerance; if one pack fails, the others maintain control without interruption.
Relay & Coil Monitoring: Continuously monitors the health of the relay coils and contacts, providing feedback to the controller to detect open or short circuits.
Hot-Swappable Design: Features a built-in soft-start mechanism and current limiter, allowing the module to be replaced while the system is powered.
Advanced Diagnostics: Includes local ambient temperature sensors and infrared serial communication for deep field diagnostics.
Installation and Maintenance
Mounting: Secure the pack to the terminal board using the two threaded studs. Ensure the DC-37 pin connector is fully seated to avoid signal integrity issues.
Network: Connect ENET1 and ENET2 to the IONet switches. In dual-redundant systems, ENET1 typically connects to the ‘R’ controller network.
Maintenance: Use the ToolboxST software for configuration and to view the “Electronic ID” of the board for asset tracking. Periodically check the visual status LEDs (Power, Link, and Output Status) for error codes.
Unique Product Description
The GE IS220PDOAH1B acts as the executive arm of the Mark VIe system.
While the controller makes the decisions, the PDOA pack carries out the physical action of switching high-power field devices.
Its surface-mount technology and conformal coating ensure it survives the vibration and thermal cycling common in power generation environments. It is the gold standard for reliable, high-speed relay control in critical infrastructure.
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Primary Keywords: IS220PDOAH1B, GE PDOA, Mark VIe Output Module, Speedtronic I/O Pack, Discrete Relay Output.