IS220PDOAH1A, New Surplus No Box

"New surplus, no box" means this IS220PDOAH1A is unused GE stock that has lost its original factory packaging somewhere in the supply chain — the pack itself was never installed or field-run. Functionally it's identical to any other H1A: the discrete output pack that mounts on a discrete output terminal board in a Mark VIe distributed I/O system, and communicates with the <R>, <S>, or <T> controller over IONet via dual RJ-45 ports.

A processor board common to every Mark VIe I/O pack pairs with an acquisition board dedicated to discrete output duty: up to 12 relay outputs, plus feedback read back from the terminal board through a single DC-37 pin connector. The terminal board sets the relay technology — electromagnetic relays live on TRLYH1B, C, D, and F boards, solid-state relays on TRLYH1E boards. Power arrives through a 3-pin connector with soft-start current limiting, and the pack self-tests on power-up, holding all outputs disabled until it confirms everything is healthy — a deliberate fail-safe sequence, not a symptom of a problem.

Before You Buy: Rule Out the Terminal Board and Wiring

• A relay that won't energize, or feedback that doesn't match the command, usually traces back to the terminal board — wiring, the relay contact, a blown fuse, or a loose connection — rather than the pack itself.
• The swap test settles it quickly: move the suspect pack to a known-good terminal board (or the reverse) and see which one the fault follows.
• Don't confuse the brief all-outputs-disabled period after power-up with a hardware fault — it's how the pack protects the process during its own self-test.
• Confirm which relay type the installed terminal board actually uses before assuming a pack swap is the fix — electromagnetic and solid-state boards are wired differently.
• Check IONet cabling and switch health; a lost network connection and a dead pack look the same from the control room.
• In a TMR configuration, confirm which core (R, S, or T) is actually alarming before removing any single pack from a working triad.

Reading IS220PDOAH1A

IS220 is the Mark VIe distributed I/O pack designation, PDOA the discrete output function, H1 the design generation, and the trailing A the hardware revision. Match the complete string — not just the PDOA prefix — to your terminal board and ControlST project. See our GE Speedtronic Part Number Decoder for the full explanation.

Related Packs

PDOA pairs with TRLY-family relay terminal boards. Where a panel uses a combined terminal board instead, the related PDIO pack covers both discrete inputs and relay outputs in one assembly. Browse our GE Mark VI IS200 Boards collection to cross-reference terminal boards and neighboring packs.

What to Include in Your Quote Request

• Full part number with suffix (IS220PDOAH1A)
• A photo of the label
• Turbine model and Mark control generation
• Quantity
• Urgency of the need

We reply within 24 hours, ship worldwide DDP, and accept purchase orders. There's no listed price to check out against — Request a Quote and our team will confirm everything with you directly.