GE IS220PDOAH1A Rev:H Mark VIe Discrete Output Module

GENERAL ELECTRIC GE IS220PDOAH1A Rev:H MARK VIe DISCRETE OUTPUT MODULE (J76P0Z2)

The General Electric IS220PDOAH1A (Revision H, Assembly Code J76P0Z2) is a 12-channel Discrete Output (PDOA) I/O pack engineered for the GE Speedtronic Mark VIe distributed control platform. Designed to bridge high-speed Ethernet-based IONet communication with heavy-duty electromechanical relay terminal boards, this module executes deterministic switching commands for critical auxiliary equipment in marine propulsion plants, offshore power generation, and land-based gas/steam turbines.

The IS220PDOAH1A mounts directly onto a compatible 37-pin D-sub connector on a Mark VIe relay terminal board (such as the IS200SRLYH2A or IS200TRLYH1B). Revision H incorporates updated surface-mount component tolerances, enhanced electromagnetic interference (EMI) filtering, and firmware compatibility tailored for long-lifecycle marine and heavy-industrial installations where single-point failures are unacceptable.

Model Details

• Manufacturer: General Electric (GE Energy / GE Vernova)
• Series: Mark VIe Speedtronic
• Manufacturer Part Number (MPN): IS220PDOAH1A
• Hardware Revision: Rev: H
• Secondary Factory / Lot Identifier: J76P0Z2
• Functional Acronym: PDOA (Pack Discrete Output, Form-A / Form-C Relay Driver)
• Architecture Support: Simplex, Dual, and Triple Modular Redundant (TMR)

Key Features

1. 12 Independent Relay Driver Channels: Drives 12 discrete outputs capable of controlling dry-contact Form-A or Form-C electromechanical relays, or solid-state outputs depending on the mated terminal board.
2. Dual 100 Mbps Full-Duplex IONet Ports: Features twin RJ45 Ethernet interfaces (ENET1 and ENET2) for deterministic, redundant communication with Mark VIe controllers.
3. Comprehensive On-Board Diagnostics: Continuously monitors coil continuity, driver output state, internal DC bus voltages, and board temperature, reporting faults directly to ToolboxST.
4. Hot-Swappable Module Architecture: Supports online replacement without powering down the terminal board or disrupting adjacent I/O packs in Dual and TMR configurations.
5. Conformal Coating for Harsh Environments: Built with industrial-grade conformal coating (denoted by the “H1A” suffix) to resist salt-mist corrosion, high humidity, and conductive dust common in marine engine rooms.

Compatible Mark VIe Terminal Boards

• IS200SRLYH2A: Simplex Relay Output Terminal Board (12 Form-C dry contacts)
• IS200TRLYH1B: TMR Relay Output Terminal Board (12 Form-C relays with 2-out-of-3 voting logic)
• IS200TRLYH1F: TMR Relay Output Terminal Board with 125 V DC solenoid power distribution
• IS200TRLYH2F: TMR Relay Output Terminal Board with 24 V DC / 48 V DC wetting options
• IS200WROBH1A: Wide Relay Output Expansion Board

Compatible Controllers & Software

• Controllers: GE Mark VIe UCSA, UCSB, UCSC, and UCSH controllers
• Configuration Software: GE ControlST / ToolboxST (V04.04 and higher recommended for Rev: H firmware support)

Part Number Cross-References

• IS220PDOAH1A: Standard 12-channel Discrete Output I/O Pack (Current Revision H)
• IS220PDOAH1B: Variant with updated internal DC-DC converter layout (Check ToolboxST device compatibility before substituting)
• IS220YDOAS1A: Safety-certified (SIL 2 / SIL 3) Mark VIeS Discrete Output equivalent (Not directly interchangeable in non-safety Mark VIe racks without controller reconfiguration)
• IS200PDOAH1A: Legacy prefix notation occasionally referenced in older BOMs; superseded by the IS220-series I/O pack designation

Frequently Asked Questions

Can I replace an older revision of the IS220PDOAH1A (such as Rev: C or Rev: F) with the IS220PDOAH1A Rev: H?

Yes. Revision H is backward-compatible with earlier revisions of the IS220PDOAH1A hardware. When hot-swapping an older revision for a Rev: H module in a running Mark VIe system, ensure ToolboxST is configured to allow automatic firmware and FPGA synchronization so the pack downloads the matching controller configuration upon boot-up.

What does the “J76P0Z2” code on the IS220PDOAH1A label signify?

The alphanumeric string J76P0Z2 is a GE factory manufacturing and assembly lot identifier printed on the barcode label alongside the core MPN (IS220PDOAH1A) and hardware revision (Rev: H). It tracks the production batch and board-level component traceability; it does not alter the electrical pinout or functional compatibility of the module.

Does the IS220PDOAH1A contain physical relays inside the module housing?

No. The IS220PDOAH1A is a solid-state relay driver and network interface pack. The actual electromechanical Form-C relays and field terminal blocks reside on the host terminal board (such as the IS200SRLYH2A or IS200TRLYH1B) into which the IS220PDOAH1A plugs via its 37-pin D-sub connector.

Why is the red ATTN LED blinking on my newly installed IS220PDOAH1A?

A blinking red ATTN LED typically indicates one of three conditions: (1) a firmware mismatch between the I/O pack and the Mark VIe controller, (2) a mismatch between the configured terminal board ID in ToolboxST and the physical terminal board detected via the 37-pin connector, or (3) a loss of communication on one of the two IONet Ethernet ports.

Is the IS220PDOAH1A suitable for marine engine room environments?

Yes. The “H1A” suffix designates conformal coating on the internal printed circuit boards, protecting the electronics against salt-laden air, high humidity, and vibration. Combined with marine type-approval certifications (ABS, DNV-GL, Lloyd’s Register) for the Mark VIe platform, it is widely deployed on LNG vessels, offshore rigs, and diesel-electric ships.